CA2115368C - Method for producing multiple fractures from a single workstring - Google Patents
Method for producing multiple fractures from a single workstring Download PDFInfo
- Publication number
- CA2115368C CA2115368C CA002115368A CA2115368A CA2115368C CA 2115368 C CA2115368 C CA 2115368C CA 002115368 A CA002115368 A CA 002115368A CA 2115368 A CA2115368 A CA 2115368A CA 2115368 C CA2115368 C CA 2115368C
- Authority
- CA
- Canada
- Prior art keywords
- wellbore
- workstring
- fracture
- different levels
- zones
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
- 208000006670 Multiple fractures Diseases 0.000 title claims abstract description 8
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 7
- 206010017076 Fracture Diseases 0.000 claims abstract description 64
- 208000010392 Bone Fractures Diseases 0.000 claims abstract description 53
- 239000012530 fluid Substances 0.000 claims abstract description 19
- 238000000034 method Methods 0.000 claims description 18
- 230000015556 catabolic process Effects 0.000 abstract description 8
- 239000002002 slurry Substances 0.000 description 26
- 239000004576 sand Substances 0.000 description 7
- 230000015572 biosynthetic process Effects 0.000 description 5
- 238000005755 formation reaction Methods 0.000 description 5
- 239000007788 liquid Substances 0.000 description 4
- 101150099190 ARR3 gene Proteins 0.000 description 2
- 239000011236 particulate material Substances 0.000 description 2
- FDQGNLOWMMVRQL-UHFFFAOYSA-N Allobarbital Chemical compound C=CCC1(CC=C)C(=O)NC(=O)NC1=O FDQGNLOWMMVRQL-UHFFFAOYSA-N 0.000 description 1
- 239000004215 Carbon black (E152) Substances 0.000 description 1
- 241000256135 Chironomus thummi Species 0.000 description 1
- 235000016499 Oxalis corniculata Nutrition 0.000 description 1
- 240000007019 Oxalis corniculata Species 0.000 description 1
- 229930195733 hydrocarbon Natural products 0.000 description 1
- 150000002430 hydrocarbons Chemical class 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/25—Methods for stimulating production
- E21B43/26—Methods for stimulating production by forming crevices or fractures
Abstract
A method for producing multiple fractures by a single operation from a single wellbore which penetrates a fracture interval which, in turn, includes a plurality of zones which break-down under different fracturing pressures. Fracturing fluid is delivered frown a workstring directly to different levels within a section of the wellbore which lies adjacent the fracture interval through a plurality of alternative paths which, in turn, lie substantially adjacent to the zones to be fractured.
Description
F-6 2~71-L ( PAC ) Method For Producing Multiple Fractures From A Single Workstrin~
'Ihe present invention relates to a method of producing multiple fractures in a wellbore.
"Hydraulic fracturing" is a well known technique ca~nly used to incxease the permeability of subterranean formations which produce hydrocarbon fluids or the like. In a typical hydraulic fracturing operation, a work string is lowered to a point adjacent the formations) to be fractured ("fracture interval"). Fracturing fluid is then ptuc~ed out of the lower end of the work string and into the formation at a pressure sufficient to cause the bedding planes of the formations) to separate, i.e. "fracture".
ZlZis separation of the bedding planes creates a network of permeable channels or fractures through which formation fluids can flow into the wellbore after the fracturing operation is completed. Since these fractures have a tex~dency to close once the fracture pressure is relaxed, props, (e. g. sand, gravel, or other particulate materials) are routinely mixed into the fracturing fluid to form a slurry which, in turn, carries the props into the fractures where they remain to "prop" the fractures open once the pressure is reduced.
Where the fracture interval is substantially homogeneous (i.e. a zone having substantially the same break-down pressure throughout its thic,)rness), standard fracturing techniques such as that described above will normally produce a good distribution of fractures along the length or thickness of the fracture interval. Unfortunately, however, many times the fracture interval lies in reservoirs which are not hoanogeneous but, instead, the interval consists of several production zones which have substantially different break-down pressures, e.g.
layered rP.servoirs, reservoirs penetrated by inclined and/or horizontal wellbores, thick rP~n~oirs, reservoirs prised of F-621-L(PAC) several proximate production zones separated by thin impermeable layers, etc.
Problems arise when fracturing these non-haanogeneous intervals with conventional fracturing techniques. For eximple, it is difficult, if not impossible, to fracture a second zone in the fracture interval once a first zone within the interval (i.e. zone with laaest "Y~'eak-dc~m" pressure) has started to fracture. The fracturing fluid slurry will continue to flow into this initial fracture and enlarge it as the pressure increases in the isolated wellbore interval.
Furthermore, liquid from the fracture slurry is likely to be "lost"
into the initial fracture causing the props, e.g. sand, to settle out of the slurry thereby forming a bridge or blockage within the wellbore adjacent the initially fractured zone. 'Ihi.s bridge prevents further flow of slurry to other zones within the fracture interval even if scene of these zones may have previously e~erier~ed some break-down.
This results in a poor distrikution of fractures throughout the fracture interval since normally only the zone having the lowest break-down pressure will be adequately fractured.
According to the present invention there is provided a method for producing multiple fractures in a single operation from a single cased wellbore which penetrates a fracture interval, said interval including a plurality of zones which break down under different pressures, said method prising:
delivering fracturing fluid to a section of the wellbore which lies substantially adjacent the interval to be fractured through alternative flowpaths directly adjacent different levels within said section, said levels lying substantially adjacent said respective zones within said section; and continuing delivery of fracturing fluid directly to said different levels within said section to thereby fracture the different zones within said fracture interval.
WO X3/04268 ~ ~ ~ ~ ~ ~ ~ PC'f/~LJS9~/06834 Preferably the method includes the step of perforating the cased wellbore at said different levels adjacent the different zor~s of the fracta~nre interval.
Desirably the method inch the step of isolatirx~ said section of the wellbore whi.r~ lies substantially adjacent the fracture interval.
~e section of the wellbore may be isolated by packers or by the cola of liquid in the well annulus.
3°he frair~ fluid is preferably delivered simultaneously through said altive flawpaths.
She fracturing fluid may be deliver~i to said alternative flowpaths by a workstring, preferably a single workstring, which is positioned within said wel3bore.
~ o~ ean3aodament the alternative flowpaths are foxed of individual oonduifs whose lower ends terminate substantially adjacent the restive different levels.
In ar~ther ~nbodiz~nt the alternative flowpatDzs are form by openings which are spaced along the l~aex° end of said workstring and positioned to lie si.zbstantially adjacent the respective different levels.
In a f~-ther enibod..iment the alternative flowpaths are formed by a plurality of shunt tubes positioned withan the ~.ower end of said workstring which have their respective lower ends terminating substantially adjacent said different levels.
-~-- ;
Peferenoe is naw made to the acxanying drawings, in which:
~'ig~'e 1 is an elevational view, partly in section, of an apparatus used in eying out the method of the present invention, shown in an aperable position within a wellbore adjacent a fracture interval;
F-6271-L(PAC) Figure 2 is an elevational view, partly in section, of an embodiment of the apparatus of Figure 1;
Figure 3 is a sectional view taken along line 3-3 in Figure 2;
Figure 4 is an elevational view, partly in section, of a further embodiment of the apparatus of Figure 1;
Figure 5 is an elevational view, partly in section, of another embodiment of the apparatus of Figure 1; and Figure 6 is an elevational view, partly in section, of still another embodiment of an apparatus used to carry out the present invention.
Referring more particularly to the drawings, Figure 1 illustrates the lower end of a producing and/or injection well 10. Well 10 has a wellbore 11 which extends from the surface (not shown) through fracture zone 12. Wellbore 11 is typically cased with a casing 13 which is cemented (not shown) in place. While the method of the present invention is illustrated as being carried out in an inclined cased wellbore, it should be recognised that the present invention can equally be used in open-hole and/or underreammed completions as well as in vertical and horizontal wellbores, as the situation dictates.
As illustrated, fracture interval 12 is comprised of a plurality (only two shown) of zones 14, 15 which have different break-down pressures.
Casing 13 is perforated at different levels to provide at least two sets of perforations 16, 17 which lie substantially adjacent zones 14, 15, respectively. Since the present invention is applicable in horizontal and inclined wellbores, the terms "upper and lower" "top and bottom' , as used hex-ein, are relative teams and are intended to apply to the respective positions within a particular wellbore; the term "levels" is meant to refer to respective positions lying along the wellbore between the terminals of the fracture interval.
A fracturing apparatus 20 is positioned in wellbore 11 substantially adjacent fracture interval 12. Fracturing apparatus 20 is comprised of F-6271-L(PAC) a workstring 21 which is closed at its lower end 22 and which e3ctends to the surface (not shown). Workstring 21 has a plurality of operLings (e.g. upper arr3 lower sets of openings 23, 24, respectively) which are -spaoed above the lower end 22 to coincide roughly with casing 5 perforations 16, 17, respectively. Packers 25 and 27 isolate the section 26 of wellbore 11 which lies adjacent fracture interval 12:
haaever, it will be recognised by those skilled in the art that the column of liquid (not shown) which is normally present in the shut-off annulus of the well is often used to effectively isolate the fracture interval without the need of upper packer 25. As used herein, "isolated section" is intended to cover both an interval that is isolated by either packers or the like and that isolated by liquid in the annulus.
In operation, a fracturing slurry containing particulate material or props, e.g. sand, is pumped dorm workstring 21 and out through upper arr3 lower openings 23, 24 into the isolated section 26 of wellbore 11.
As section 26 fills with slurry and the pressure increases, the slurry is forced through casing perforations 16, 17 and attests to enter zones 14, 15 of the fracture interval 12. However, since, as illustrated, zone 15 has a lower break-down pressure, the slurry takes the path of least resistance and enters and fractures zone 15 first.
In a conventional fracturing operation where the slurry only exits through the lower end of a workstring, once zone 15 breaks dcxan, the slurry will continue to flow into zone 15 to enlarge the initial fracture while little or no slurry is forced through the upper casing perforations 16 into zone 14. Etrentually, fluid from the slurry is lost into the initially fractured zone 15, causing the sand in the slurry to settle to form a bridge 30 (Figure 1) in the wellbore.
midge 30 blocks any further flow of slurry to zone 14 resulting in a poor distribution of fractures throughout fracture interval 12. This may result in the workstring having to be repositioned, packers reset, etc. in order to provide the desired multiple fractures within fracture interval 12.
wo o3ioa2s~ Pcriusgmo~s~~
?:~1~a3~~
In the present invention, even after zone 15 has been fractured and/or sanded off, slurry can continue to flow through upper ors 23, i.e. alternative flowpaths, in the workstring 21. As the pre..ssur-e builds above the break-dorm pressure of zone 14, slu~ay will be forced through casiazg perforations if to fracture zone 14. While only two zones in the fracture interval arx~ two sets of openings in the workstrj.rx~ aa~d casing have been illustrat~i, it should be understood that the workstrir~ of the present invention may have openings at more than two levels to service ire than two zones in the desired fracture int:er~al. The i~ortant feature is to provide al.te;~-native fla.~ paths for the slurry to the different levels or zones of the fracture interval so that multiple fractures can be produced from a single workstring. The slurry will continue to be delivered to the respective levels in the interval to fracture the respective zones until all of the zones have been fractured regardless of which zone fractures first or whether or not sand bridges form in the wellbore during the fracture operation.
Whiles in most operations the fracturing fluid will flea simultaneously through all of the alternative flawpaths to all of the different levels within the fracture interval, there may be times that it will be desired to fracture the zones of a particular fracture interval in a preferred sequence. laccordingly, the respective ors in the worlcstring can be sized so that the slurry will seek the path of least resistance and will flow primarily through the larger openirys in the workstring which are positioned adjacent the first zone to be fractur~3, then through a second set of smaller openings positioned adjacent a second zone, and so forth until all of the zones have been fractured.
Also, valve means (not shown) , e.g. discs which rupture at different pressures, may be used to close openings in the workstring at particular levels so that no flow will occur through these openings until a desired pressure is reached.
' F-6?.71-L(PAC) Figures 2 and 3 illustrate another ~t of a fracturing apparatus 20a which can be used to carry out the present invention.
Apparatus 20a is prised of a bundle or plurality of conduits 31, 32 (only two shown) which are mounted and encased within perforated carrier tube 33 which, in turn, provides structural integrity and support for the conduits. Conduits 31, 32 may be of different lengths (as shown), so that they txrminate at different levels within tube 33 and open only at their lower ends or they may be of equal or varying lengths with openings (not shown) at different levels to coincide substantially with the different perforations in casing 13a.
As seen in Figure 2, slurry is delivered out of the lacer ends of the individual conduits 31, 32 to fill the lower end of carrier tube 33.
The slurry will flow out of the perforations in tube 33 to fill isolated section 26a of the wellbore. As described above, the slurry initially breaks-dcx~m zone 15a since it has the lowest breakdown pressure. 4~hen this occurs, and even if a sand bridge forms and blocks the flow through the lower end of carrier tube 33, slurry will continue to be delivered through conduit 32 and the upper perforations 2 0 in tube 3 3 to fracture the second zone ( not shown ) in the fracture interval 12a.
Figure 4 illustrates a fracturing apparatus 30b, which is similar to fracturing apparatus 20a, having a plurality of conduits 31a, 32a which are mounted on and carried by a central tubular member 33a.
Barr3s 34 or the like secure the conduits onto the outer surface of central member 33. The conduits 31a, 32a terminate at different levels and are used to carry out the multiple fracturing operation in the same manner as described above in relation to the fracturing apparatus 30a.
Figure 5 illustrates a further embodiment of a fracturing apparatus 30c which is cx~mprised of a workstring 21b which, in turn, is adapted to extend downward into wellbore 11 to a point which is substantially adjacent the top of the fracture interval 12c. A plurality of conduits 31c, 32c (only two shown) having different lengths are connected to F-671-L(PAC) the bottoan of workstring 21b arxi are in fluid oomzrninication therewith.
When apparatus 30c is in an operable position within the wellbore, ~nduits 31c, 32c will terminate at different levels within the wellbore adjacent different zones of the fracture interval. Fracturing slurry flows dawn workstring 21b and is delivered directly to different levels within the isolated section 26c throuc~ the corxiuits (i.e. alternative paths) to carry out the fracturing operation as described above.
Still another embodiment of a fracturing apparatus which can be used to carry out the present method is shown in Figure 6. Fracturing apparatus 30d is prised of a carrier tube 33d having a perforated lower section which is adapted to lie substantially adjacent to fracture interval 12d when apparatus 30d is in an operable position within wellbore 11d. A plurality of shunt tubes 31d, 32d (only two shown) of different lengths are mounted within the perforated section of the workstring with their upper ends lying substantially adjacent the upper end of the perforated section and their respective lower ends txrmiriating at different levels within the perforated section.
The shunt tubes are open at both their upper and lower ends to allow fluid flow therethrough.
In operation, fracturing slurry flows down the workstring and out the perforated section at the lower end thereof. At the same time, slung is flowing through the shunt tubes (i.a. alternative paths) and the adjacent openings in the perforated section to be delivered directly to the respective different levels. If one zone fractures first and/or a sand bridge is formed before the fracture operation is complete, slurry can still flow throuc~ the other shunt tubes to fracture the other zones within the fracture interval.
'Ihe present invention relates to a method of producing multiple fractures in a wellbore.
"Hydraulic fracturing" is a well known technique ca~nly used to incxease the permeability of subterranean formations which produce hydrocarbon fluids or the like. In a typical hydraulic fracturing operation, a work string is lowered to a point adjacent the formations) to be fractured ("fracture interval"). Fracturing fluid is then ptuc~ed out of the lower end of the work string and into the formation at a pressure sufficient to cause the bedding planes of the formations) to separate, i.e. "fracture".
ZlZis separation of the bedding planes creates a network of permeable channels or fractures through which formation fluids can flow into the wellbore after the fracturing operation is completed. Since these fractures have a tex~dency to close once the fracture pressure is relaxed, props, (e. g. sand, gravel, or other particulate materials) are routinely mixed into the fracturing fluid to form a slurry which, in turn, carries the props into the fractures where they remain to "prop" the fractures open once the pressure is reduced.
Where the fracture interval is substantially homogeneous (i.e. a zone having substantially the same break-down pressure throughout its thic,)rness), standard fracturing techniques such as that described above will normally produce a good distribution of fractures along the length or thickness of the fracture interval. Unfortunately, however, many times the fracture interval lies in reservoirs which are not hoanogeneous but, instead, the interval consists of several production zones which have substantially different break-down pressures, e.g.
layered rP.servoirs, reservoirs penetrated by inclined and/or horizontal wellbores, thick rP~n~oirs, reservoirs prised of F-621-L(PAC) several proximate production zones separated by thin impermeable layers, etc.
Problems arise when fracturing these non-haanogeneous intervals with conventional fracturing techniques. For eximple, it is difficult, if not impossible, to fracture a second zone in the fracture interval once a first zone within the interval (i.e. zone with laaest "Y~'eak-dc~m" pressure) has started to fracture. The fracturing fluid slurry will continue to flow into this initial fracture and enlarge it as the pressure increases in the isolated wellbore interval.
Furthermore, liquid from the fracture slurry is likely to be "lost"
into the initial fracture causing the props, e.g. sand, to settle out of the slurry thereby forming a bridge or blockage within the wellbore adjacent the initially fractured zone. 'Ihi.s bridge prevents further flow of slurry to other zones within the fracture interval even if scene of these zones may have previously e~erier~ed some break-down.
This results in a poor distrikution of fractures throughout the fracture interval since normally only the zone having the lowest break-down pressure will be adequately fractured.
According to the present invention there is provided a method for producing multiple fractures in a single operation from a single cased wellbore which penetrates a fracture interval, said interval including a plurality of zones which break down under different pressures, said method prising:
delivering fracturing fluid to a section of the wellbore which lies substantially adjacent the interval to be fractured through alternative flowpaths directly adjacent different levels within said section, said levels lying substantially adjacent said respective zones within said section; and continuing delivery of fracturing fluid directly to said different levels within said section to thereby fracture the different zones within said fracture interval.
WO X3/04268 ~ ~ ~ ~ ~ ~ ~ PC'f/~LJS9~/06834 Preferably the method includes the step of perforating the cased wellbore at said different levels adjacent the different zor~s of the fracta~nre interval.
Desirably the method inch the step of isolatirx~ said section of the wellbore whi.r~ lies substantially adjacent the fracture interval.
~e section of the wellbore may be isolated by packers or by the cola of liquid in the well annulus.
3°he frair~ fluid is preferably delivered simultaneously through said altive flawpaths.
She fracturing fluid may be deliver~i to said alternative flowpaths by a workstring, preferably a single workstring, which is positioned within said wel3bore.
~ o~ ean3aodament the alternative flowpaths are foxed of individual oonduifs whose lower ends terminate substantially adjacent the restive different levels.
In ar~ther ~nbodiz~nt the alternative flowpatDzs are form by openings which are spaced along the l~aex° end of said workstring and positioned to lie si.zbstantially adjacent the respective different levels.
In a f~-ther enibod..iment the alternative flowpaths are formed by a plurality of shunt tubes positioned withan the ~.ower end of said workstring which have their respective lower ends terminating substantially adjacent said different levels.
-~-- ;
Peferenoe is naw made to the acxanying drawings, in which:
~'ig~'e 1 is an elevational view, partly in section, of an apparatus used in eying out the method of the present invention, shown in an aperable position within a wellbore adjacent a fracture interval;
F-6271-L(PAC) Figure 2 is an elevational view, partly in section, of an embodiment of the apparatus of Figure 1;
Figure 3 is a sectional view taken along line 3-3 in Figure 2;
Figure 4 is an elevational view, partly in section, of a further embodiment of the apparatus of Figure 1;
Figure 5 is an elevational view, partly in section, of another embodiment of the apparatus of Figure 1; and Figure 6 is an elevational view, partly in section, of still another embodiment of an apparatus used to carry out the present invention.
Referring more particularly to the drawings, Figure 1 illustrates the lower end of a producing and/or injection well 10. Well 10 has a wellbore 11 which extends from the surface (not shown) through fracture zone 12. Wellbore 11 is typically cased with a casing 13 which is cemented (not shown) in place. While the method of the present invention is illustrated as being carried out in an inclined cased wellbore, it should be recognised that the present invention can equally be used in open-hole and/or underreammed completions as well as in vertical and horizontal wellbores, as the situation dictates.
As illustrated, fracture interval 12 is comprised of a plurality (only two shown) of zones 14, 15 which have different break-down pressures.
Casing 13 is perforated at different levels to provide at least two sets of perforations 16, 17 which lie substantially adjacent zones 14, 15, respectively. Since the present invention is applicable in horizontal and inclined wellbores, the terms "upper and lower" "top and bottom' , as used hex-ein, are relative teams and are intended to apply to the respective positions within a particular wellbore; the term "levels" is meant to refer to respective positions lying along the wellbore between the terminals of the fracture interval.
A fracturing apparatus 20 is positioned in wellbore 11 substantially adjacent fracture interval 12. Fracturing apparatus 20 is comprised of F-6271-L(PAC) a workstring 21 which is closed at its lower end 22 and which e3ctends to the surface (not shown). Workstring 21 has a plurality of operLings (e.g. upper arr3 lower sets of openings 23, 24, respectively) which are -spaoed above the lower end 22 to coincide roughly with casing 5 perforations 16, 17, respectively. Packers 25 and 27 isolate the section 26 of wellbore 11 which lies adjacent fracture interval 12:
haaever, it will be recognised by those skilled in the art that the column of liquid (not shown) which is normally present in the shut-off annulus of the well is often used to effectively isolate the fracture interval without the need of upper packer 25. As used herein, "isolated section" is intended to cover both an interval that is isolated by either packers or the like and that isolated by liquid in the annulus.
In operation, a fracturing slurry containing particulate material or props, e.g. sand, is pumped dorm workstring 21 and out through upper arr3 lower openings 23, 24 into the isolated section 26 of wellbore 11.
As section 26 fills with slurry and the pressure increases, the slurry is forced through casing perforations 16, 17 and attests to enter zones 14, 15 of the fracture interval 12. However, since, as illustrated, zone 15 has a lower break-down pressure, the slurry takes the path of least resistance and enters and fractures zone 15 first.
In a conventional fracturing operation where the slurry only exits through the lower end of a workstring, once zone 15 breaks dcxan, the slurry will continue to flow into zone 15 to enlarge the initial fracture while little or no slurry is forced through the upper casing perforations 16 into zone 14. Etrentually, fluid from the slurry is lost into the initially fractured zone 15, causing the sand in the slurry to settle to form a bridge 30 (Figure 1) in the wellbore.
midge 30 blocks any further flow of slurry to zone 14 resulting in a poor distribution of fractures throughout fracture interval 12. This may result in the workstring having to be repositioned, packers reset, etc. in order to provide the desired multiple fractures within fracture interval 12.
wo o3ioa2s~ Pcriusgmo~s~~
?:~1~a3~~
In the present invention, even after zone 15 has been fractured and/or sanded off, slurry can continue to flow through upper ors 23, i.e. alternative flowpaths, in the workstring 21. As the pre..ssur-e builds above the break-dorm pressure of zone 14, slu~ay will be forced through casiazg perforations if to fracture zone 14. While only two zones in the fracture interval arx~ two sets of openings in the workstrj.rx~ aa~d casing have been illustrat~i, it should be understood that the workstrir~ of the present invention may have openings at more than two levels to service ire than two zones in the desired fracture int:er~al. The i~ortant feature is to provide al.te;~-native fla.~ paths for the slurry to the different levels or zones of the fracture interval so that multiple fractures can be produced from a single workstring. The slurry will continue to be delivered to the respective levels in the interval to fracture the respective zones until all of the zones have been fractured regardless of which zone fractures first or whether or not sand bridges form in the wellbore during the fracture operation.
Whiles in most operations the fracturing fluid will flea simultaneously through all of the alternative flawpaths to all of the different levels within the fracture interval, there may be times that it will be desired to fracture the zones of a particular fracture interval in a preferred sequence. laccordingly, the respective ors in the worlcstring can be sized so that the slurry will seek the path of least resistance and will flow primarily through the larger openirys in the workstring which are positioned adjacent the first zone to be fractur~3, then through a second set of smaller openings positioned adjacent a second zone, and so forth until all of the zones have been fractured.
Also, valve means (not shown) , e.g. discs which rupture at different pressures, may be used to close openings in the workstring at particular levels so that no flow will occur through these openings until a desired pressure is reached.
' F-6?.71-L(PAC) Figures 2 and 3 illustrate another ~t of a fracturing apparatus 20a which can be used to carry out the present invention.
Apparatus 20a is prised of a bundle or plurality of conduits 31, 32 (only two shown) which are mounted and encased within perforated carrier tube 33 which, in turn, provides structural integrity and support for the conduits. Conduits 31, 32 may be of different lengths (as shown), so that they txrminate at different levels within tube 33 and open only at their lower ends or they may be of equal or varying lengths with openings (not shown) at different levels to coincide substantially with the different perforations in casing 13a.
As seen in Figure 2, slurry is delivered out of the lacer ends of the individual conduits 31, 32 to fill the lower end of carrier tube 33.
The slurry will flow out of the perforations in tube 33 to fill isolated section 26a of the wellbore. As described above, the slurry initially breaks-dcx~m zone 15a since it has the lowest breakdown pressure. 4~hen this occurs, and even if a sand bridge forms and blocks the flow through the lower end of carrier tube 33, slurry will continue to be delivered through conduit 32 and the upper perforations 2 0 in tube 3 3 to fracture the second zone ( not shown ) in the fracture interval 12a.
Figure 4 illustrates a fracturing apparatus 30b, which is similar to fracturing apparatus 20a, having a plurality of conduits 31a, 32a which are mounted on and carried by a central tubular member 33a.
Barr3s 34 or the like secure the conduits onto the outer surface of central member 33. The conduits 31a, 32a terminate at different levels and are used to carry out the multiple fracturing operation in the same manner as described above in relation to the fracturing apparatus 30a.
Figure 5 illustrates a further embodiment of a fracturing apparatus 30c which is cx~mprised of a workstring 21b which, in turn, is adapted to extend downward into wellbore 11 to a point which is substantially adjacent the top of the fracture interval 12c. A plurality of conduits 31c, 32c (only two shown) having different lengths are connected to F-671-L(PAC) the bottoan of workstring 21b arxi are in fluid oomzrninication therewith.
When apparatus 30c is in an operable position within the wellbore, ~nduits 31c, 32c will terminate at different levels within the wellbore adjacent different zones of the fracture interval. Fracturing slurry flows dawn workstring 21b and is delivered directly to different levels within the isolated section 26c throuc~ the corxiuits (i.e. alternative paths) to carry out the fracturing operation as described above.
Still another embodiment of a fracturing apparatus which can be used to carry out the present method is shown in Figure 6. Fracturing apparatus 30d is prised of a carrier tube 33d having a perforated lower section which is adapted to lie substantially adjacent to fracture interval 12d when apparatus 30d is in an operable position within wellbore 11d. A plurality of shunt tubes 31d, 32d (only two shown) of different lengths are mounted within the perforated section of the workstring with their upper ends lying substantially adjacent the upper end of the perforated section and their respective lower ends txrmiriating at different levels within the perforated section.
The shunt tubes are open at both their upper and lower ends to allow fluid flow therethrough.
In operation, fracturing slurry flows down the workstring and out the perforated section at the lower end thereof. At the same time, slung is flowing through the shunt tubes (i.a. alternative paths) and the adjacent openings in the perforated section to be delivered directly to the respective different levels. If one zone fractures first and/or a sand bridge is formed before the fracture operation is complete, slurry can still flow throuc~ the other shunt tubes to fracture the other zones within the fracture interval.
Claims (8)
1. A method for producing multiple fractures in a single operation from a single wellbore which, in turn, penetrates a fracture interval which includes a plurality of zones which break down under different pressures, said method comprising:
isolating a section of the wellbore which lies substantially adjacent said fracture interval;
delivering fracturing fluid through alternate flowpaths directly adjacent different levels within said isolated section which lie substantially adjacent said respective zones within said isolated section;
continuing delivery of fracturing fluid directly to said different levels within said isolated section to thereby fracture the different zones within said fracture interval.
isolating a section of the wellbore which lies substantially adjacent said fracture interval;
delivering fracturing fluid through alternate flowpaths directly adjacent different levels within said isolated section which lie substantially adjacent said respective zones within said isolated section;
continuing delivery of fracturing fluid directly to said different levels within said isolated section to thereby fracture the different zones within said fracture interval.
2. The method according to claim 1, wherein the wellbore is cased and including the step of perforating the cased wellbore at said different levels adjacent the different zones of the fracture interval.
3. The method according to claim 1, wherein said fracturing fluid is delivered simultaneously trough said alternative flowpaths.
4. The method according to claim 1, wherein said fracturing fluid is delviered to said alternative flowpaths by a workstring which is positioned. within said wellbore.
5. The method according to claim 4, wherein said fracturing fluid is delivered to said alternative paths trhough a single workstring in said wellbore.
6. The method according to claim 4, wherein said alternative flowpaths are formed of individual conduits whose lower ends terminate substantially adjacent the respective different levels.
7. The method according to claim 4, wherein said alternative flowpaths are formed by openings which are spaced along the lower end of said workstring and positioned to lie substantially adjacent the respective different levels.
8. The method according to claim 4, wherein said alternative flowpaths are formed by a plurality of shunt tubes positioned within the lower end of said workstring which have their respective lower ends terminating substantially adjacent said different levels.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US07/745,657 | 1991-08-16 | ||
| US07/745,657 US5161618A (en) | 1991-08-16 | 1991-08-16 | Multiple fractures from a single workstring |
| PCT/US1992/006834 WO1993004268A1 (en) | 1991-08-16 | 1992-08-14 | Method for producing multiple fractures in a wellbore |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CA2115368A1 CA2115368A1 (en) | 1993-03-04 |
| CA2115368C true CA2115368C (en) | 2003-02-25 |
Family
ID=24997667
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002115368A Expired - Lifetime CA2115368C (en) | 1991-08-16 | 1992-08-14 | Method for producing multiple fractures from a single workstring |
Country Status (8)
| Country | Link |
|---|---|
| US (1) | US5161618A (en) |
| AU (1) | AU665570B2 (en) |
| CA (1) | CA2115368C (en) |
| DE (2) | DE4292758B4 (en) |
| GB (1) | GB2273308B (en) |
| NO (1) | NO309739B1 (en) |
| RU (1) | RU2103495C1 (en) |
| WO (1) | WO1993004268A1 (en) |
Families Citing this family (98)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5333688A (en) * | 1993-01-07 | 1994-08-02 | Mobil Oil Corporation | Method and apparatus for gravel packing of wells |
| US5390966A (en) * | 1993-10-22 | 1995-02-21 | Mobil Oil Corporation | Single connector for shunt conduits on well tool |
| US5377756A (en) * | 1993-10-28 | 1995-01-03 | Mobil Oil Corporation | Method for producing low permeability reservoirs using a single well |
| US5419394A (en) * | 1993-11-22 | 1995-05-30 | Mobil Oil Corporation | Tools for delivering fluid to spaced levels in a wellbore |
| US5417284A (en) * | 1994-06-06 | 1995-05-23 | Mobil Oil Corporation | Method for fracturing and propping a formation |
| US5435391A (en) * | 1994-08-05 | 1995-07-25 | Mobil Oil Corporation | Method for fracturing and propping a formation |
| US5515915A (en) * | 1995-04-10 | 1996-05-14 | Mobil Oil Corporation | Well screen having internal shunt tubes |
| US5622224A (en) * | 1995-06-20 | 1997-04-22 | Mobil Oil Corporation | Method and apparatus for cementing well casing using alternate flow paths |
| US5875843A (en) * | 1995-07-14 | 1999-03-02 | Hill; Gilman A. | Method for vertically extending a well |
| US5560427A (en) * | 1995-07-24 | 1996-10-01 | Mobil Oil Corporation | Fracturing and propping a formation using a downhole slurry splitter |
| US5588487A (en) * | 1995-09-12 | 1996-12-31 | Mobil Oil Corporation | Tool for blocking axial flow in gravel-packed well annulus |
| US5690175A (en) * | 1996-03-04 | 1997-11-25 | Mobil Oil Corporation | Well tool for gravel packing a well using low viscosity fluids |
| US5848645A (en) * | 1996-09-05 | 1998-12-15 | Mobil Oil Corporation | Method for fracturing and gravel-packing a well |
| US5964289A (en) * | 1997-01-14 | 1999-10-12 | Hill; Gilman A. | Multiple zone well completion method and apparatus |
| US5842516A (en) * | 1997-04-04 | 1998-12-01 | Mobil Oil Corporation | Erosion-resistant inserts for fluid outlets in a well tool and method for installing same |
| PL338903A1 (en) * | 1997-08-26 | 2000-11-20 | Exxonmobil Upstream Res Co | Stimulation of lenticular earth gas formations |
| US6003600A (en) * | 1997-10-16 | 1999-12-21 | Halliburton Energy Services, Inc. | Methods of completing wells in unconsolidated subterranean zones |
| AU738914C (en) | 1997-10-16 | 2002-04-11 | Halliburton Energy Services, Inc. | Methods and apparatus for completing wells in unconsolidated subterranean zones |
| US6427775B1 (en) | 1997-10-16 | 2002-08-06 | Halliburton Energy Services, Inc. | Methods and apparatus for completing wells in unconsolidated subterranean zones |
| US6481494B1 (en) | 1997-10-16 | 2002-11-19 | Halliburton Energy Services, Inc. | Method and apparatus for frac/gravel packs |
| US6059032A (en) * | 1997-12-10 | 2000-05-09 | Mobil Oil Corporation | Method and apparatus for treating long formation intervals |
| US6367566B1 (en) * | 1998-02-20 | 2002-04-09 | Gilman A. Hill | Down hole, hydrodynamic well control, blowout prevention |
| US6186230B1 (en) | 1999-01-20 | 2001-02-13 | Exxonmobil Upstream Research Company | Completion method for one perforated interval per fracture stage during multi-stage fracturing |
| US6394184B2 (en) | 2000-02-15 | 2002-05-28 | Exxonmobil Upstream Research Company | Method and apparatus for stimulation of multiple formation intervals |
| US7100690B2 (en) * | 2000-07-13 | 2006-09-05 | Halliburton Energy Services, Inc. | Gravel packing apparatus having an integrated sensor and method for use of same |
| DZ3387A1 (en) | 2000-07-18 | 2002-01-24 | Exxonmobil Upstream Res Co | PROCESS FOR TREATING MULTIPLE INTERVALS IN A WELLBORE |
| US6644406B1 (en) | 2000-07-31 | 2003-11-11 | Mobil Oil Corporation | Fracturing different levels within a completion interval of a well |
| US6752206B2 (en) | 2000-08-04 | 2004-06-22 | Schlumberger Technology Corporation | Sand control method and apparatus |
| US6464007B1 (en) | 2000-08-22 | 2002-10-15 | Exxonmobil Oil Corporation | Method and well tool for gravel packing a long well interval using low viscosity fluids |
| US6557634B2 (en) * | 2001-03-06 | 2003-05-06 | Halliburton Energy Services, Inc. | Apparatus and method for gravel packing an interval of a wellbore |
| US6789624B2 (en) * | 2002-05-31 | 2004-09-14 | Halliburton Energy Services, Inc. | Apparatus and method for gravel packing an interval of a wellbore |
| US6588506B2 (en) | 2001-05-25 | 2003-07-08 | Exxonmobil Corporation | Method and apparatus for gravel packing a well |
| AU2002344808A1 (en) | 2001-06-19 | 2003-01-02 | Exxonmobil Upstream Research Company | Perforating gun assembly for use in multi-stage stimulation operations |
| US6516881B2 (en) | 2001-06-27 | 2003-02-11 | Halliburton Energy Services, Inc. | Apparatus and method for gravel packing an interval of a wellbore |
| US6601646B2 (en) | 2001-06-28 | 2003-08-05 | Halliburton Energy Services, Inc. | Apparatus and method for sequentially packing an interval of a wellbore |
| US6588507B2 (en) | 2001-06-28 | 2003-07-08 | Halliburton Energy Services, Inc. | Apparatus and method for progressively gravel packing an interval of a wellbore |
| US6581689B2 (en) | 2001-06-28 | 2003-06-24 | Halliburton Energy Services, Inc. | Screen assembly and method for gravel packing an interval of a wellbore |
| US6516882B2 (en) | 2001-07-16 | 2003-02-11 | Halliburton Energy Services, Inc. | Apparatus and method for gravel packing an interval of a wellbore |
| US6752207B2 (en) | 2001-08-07 | 2004-06-22 | Schlumberger Technology Corporation | Apparatus and method for alternate path system |
| US6830104B2 (en) * | 2001-08-14 | 2004-12-14 | Halliburton Energy Services, Inc. | Well shroud and sand control screen apparatus and completion method |
| US6702019B2 (en) | 2001-10-22 | 2004-03-09 | Halliburton Energy Services, Inc. | Apparatus and method for progressively treating an interval of a wellbore |
| US6772837B2 (en) | 2001-10-22 | 2004-08-10 | Halliburton Energy Services, Inc. | Screen assembly having diverter members and method for progressively treating an interval of a welibore |
| US7096945B2 (en) * | 2002-01-25 | 2006-08-29 | Halliburton Energy Services, Inc. | Sand control screen assembly and treatment method using the same |
| US6899176B2 (en) | 2002-01-25 | 2005-05-31 | Halliburton Energy Services, Inc. | Sand control screen assembly and treatment method using the same |
| US6719051B2 (en) | 2002-01-25 | 2004-04-13 | Halliburton Energy Services, Inc. | Sand control screen assembly and treatment method using the same |
| US6715545B2 (en) | 2002-03-27 | 2004-04-06 | Halliburton Energy Services, Inc. | Transition member for maintaining for fluid slurry velocity therethrough and method for use of same |
| US6776238B2 (en) | 2002-04-09 | 2004-08-17 | Halliburton Energy Services, Inc. | Single trip method for selectively fracture packing multiple formations traversed by a wellbore |
| US6793017B2 (en) | 2002-07-24 | 2004-09-21 | Halliburton Energy Services, Inc. | Method and apparatus for transferring material in a wellbore |
| US6863131B2 (en) | 2002-07-25 | 2005-03-08 | Baker Hughes Incorporated | Expandable screen with auxiliary conduit |
| US7055598B2 (en) * | 2002-08-26 | 2006-06-06 | Halliburton Energy Services, Inc. | Fluid flow control device and method for use of same |
| US6776236B1 (en) | 2002-10-16 | 2004-08-17 | Halliburton Energy Services, Inc. | Methods of completing wells in unconsolidated formations |
| US6814139B2 (en) * | 2002-10-17 | 2004-11-09 | Halliburton Energy Services, Inc. | Gravel packing apparatus having an integrated joint connection and method for use of same |
| US6923262B2 (en) * | 2002-11-07 | 2005-08-02 | Baker Hughes Incorporated | Alternate path auger screen |
| US6814144B2 (en) | 2002-11-18 | 2004-11-09 | Exxonmobil Upstream Research Company | Well treating process and system |
| US6871149B2 (en) * | 2002-12-06 | 2005-03-22 | New Transducers Limited | Contact sensitive device |
| US6886634B2 (en) * | 2003-01-15 | 2005-05-03 | Halliburton Energy Services, Inc. | Sand control screen assembly having an internal isolation member and treatment method using the same |
| US6857476B2 (en) * | 2003-01-15 | 2005-02-22 | Halliburton Energy Services, Inc. | Sand control screen assembly having an internal seal element and treatment method using the same |
| US20040140089A1 (en) * | 2003-01-21 | 2004-07-22 | Terje Gunneroed | Well screen with internal shunt tubes, exit nozzles and connectors with manifold |
| US6978840B2 (en) | 2003-02-05 | 2005-12-27 | Halliburton Energy Services, Inc. | Well screen assembly and system with controllable variable flow area and method of using same for oil well fluid production |
| US7870898B2 (en) | 2003-03-31 | 2011-01-18 | Exxonmobil Upstream Research Company | Well flow control systems and methods |
| EA007407B1 (en) * | 2003-03-31 | 2006-10-27 | Эксонмобил Апстрим Рисерч Компани | A wellbore apparatus and method for completion, production and injection of fluid flow |
| US6994170B2 (en) * | 2003-05-29 | 2006-02-07 | Halliburton Energy Services, Inc. | Expandable sand control screen assembly having fluid flow control capabilities and method for use of same |
| US7140437B2 (en) * | 2003-07-21 | 2006-11-28 | Halliburton Energy Services, Inc. | Apparatus and method for monitoring a treatment process in a production interval |
| US20050028977A1 (en) * | 2003-08-06 | 2005-02-10 | Ward Stephen L. | Alternate path gravel packing with enclosed shunt tubes |
| US7147054B2 (en) * | 2003-09-03 | 2006-12-12 | Schlumberger Technology Corporation | Gravel packing a well |
| US20050061501A1 (en) * | 2003-09-23 | 2005-03-24 | Ward Stephen L. | Alternate path gravel packing with enclosed shunt tubes |
| US20050082060A1 (en) * | 2003-10-21 | 2005-04-21 | Ward Stephen L. | Well screen primary tube gravel pack method |
| US7866708B2 (en) * | 2004-03-09 | 2011-01-11 | Schlumberger Technology Corporation | Joining tubular members |
| US20060037752A1 (en) * | 2004-08-20 | 2006-02-23 | Penno Andrew D | Rat hole bypass for gravel packing assembly |
| US7191833B2 (en) * | 2004-08-24 | 2007-03-20 | Halliburton Energy Services, Inc. | Sand control screen assembly having fluid loss control capability and method for use of same |
| NO325506B1 (en) * | 2005-12-27 | 2008-05-26 | Rune Freyer | Method and apparatus for stimulating a subsurface well |
| US8490699B2 (en) * | 2007-07-25 | 2013-07-23 | Schlumberger Technology Corporation | High solids content slurry methods |
| US10011763B2 (en) | 2007-07-25 | 2018-07-03 | Schlumberger Technology Corporation | Methods to deliver fluids on a well site with variable solids concentration from solid slurries |
| US8490698B2 (en) * | 2007-07-25 | 2013-07-23 | Schlumberger Technology Corporation | High solids content methods and slurries |
| US8936082B2 (en) | 2007-07-25 | 2015-01-20 | Schlumberger Technology Corporation | High solids content slurry systems and methods |
| US9080440B2 (en) | 2007-07-25 | 2015-07-14 | Schlumberger Technology Corporation | Proppant pillar placement in a fracture with high solid content fluid |
| US9040468B2 (en) | 2007-07-25 | 2015-05-26 | Schlumberger Technology Corporation | Hydrolyzable particle compositions, treatment fluids and methods |
| WO2009126057A1 (en) * | 2008-04-09 | 2009-10-15 | Schlumberger Canada Limited | Method of producing high permeability hydraulic fractures (variants) and system used for method implementation |
| US7644761B1 (en) | 2008-07-14 | 2010-01-12 | Schlumberger Technology Corporation | Fracturing method for subterranean reservoirs |
| WO2010050991A1 (en) | 2008-11-03 | 2010-05-06 | Exxonmobil Upstream Research Company | Well flow control systems and methods |
| BRPI1013547A2 (en) | 2009-04-14 | 2016-04-12 | Exxonmobil Upstream Res Co | tubular assembly adapted for downhole use, and method for operating a hydrocarbon-related well |
| US8960295B2 (en) | 2009-04-24 | 2015-02-24 | Chevron U.S.A. Inc. | Fracture valve tools and related methods |
| US8662172B2 (en) | 2010-04-12 | 2014-03-04 | Schlumberger Technology Corporation | Methods to gravel pack a well using expanding materials |
| US8505628B2 (en) | 2010-06-30 | 2013-08-13 | Schlumberger Technology Corporation | High solids content slurries, systems and methods |
| US8511381B2 (en) | 2010-06-30 | 2013-08-20 | Schlumberger Technology Corporation | High solids content slurry methods and systems |
| US8607870B2 (en) | 2010-11-19 | 2013-12-17 | Schlumberger Technology Corporation | Methods to create high conductivity fractures that connect hydraulic fracture networks in a well |
| US9133387B2 (en) | 2011-06-06 | 2015-09-15 | Schlumberger Technology Corporation | Methods to improve stability of high solid content fluid |
| RU2472926C1 (en) * | 2011-07-20 | 2013-01-20 | Открытое акционерное общество "Татнефть" им. В.Д. Шашина | Method for multiple hydraulic fracturing of formation in horizontal shaft of well |
| CA2849253C (en) | 2011-10-12 | 2017-08-08 | Exxonmobil Upstream Research Company | Fluid filtering device for a wellbore and method for completing a wellbore |
| US9863228B2 (en) | 2012-03-08 | 2018-01-09 | Schlumberger Technology Corporation | System and method for delivering treatment fluid |
| US9803457B2 (en) | 2012-03-08 | 2017-10-31 | Schlumberger Technology Corporation | System and method for delivering treatment fluid |
| US9759046B2 (en) * | 2012-07-24 | 2017-09-12 | Halliburton Energy Services, Inc. | Pipe-in-pipe shunt tube assembly |
| CN104755695B (en) | 2012-10-26 | 2018-07-03 | 埃克森美孚上游研究公司 | Method for the underground adapter assembly of flow control and for completing pit shaft |
| US9528354B2 (en) | 2012-11-14 | 2016-12-27 | Schlumberger Technology Corporation | Downhole tool positioning system and method |
| WO2014149395A2 (en) | 2013-03-15 | 2014-09-25 | Exxonmobil Upstream Research Company | Sand control screen having improved reliability |
| CA2901982C (en) | 2013-03-15 | 2017-07-18 | Exxonmobil Upstream Research Company | Apparatus and methods for well control |
| US9388335B2 (en) | 2013-07-25 | 2016-07-12 | Schlumberger Technology Corporation | Pickering emulsion treatment fluid |
| RU2548271C1 (en) * | 2014-07-30 | 2015-04-20 | Открытое акционерное общество "Татнефть" им. В.Д. Шашина | Oil producing well operation method |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2970645A (en) * | 1957-03-06 | 1961-02-07 | Pan American Petroleum Corp | Producing multiple fractures in a well |
| US3289762A (en) * | 1963-12-26 | 1966-12-06 | Halliburton Co | Multiple fracturing in a well |
| US3712379A (en) * | 1970-12-28 | 1973-01-23 | Sun Oil Co | Multiple fracturing process |
| US4424859A (en) * | 1981-11-04 | 1984-01-10 | Sims Coleman W | Multi-channel fluid injection system |
| US4867241A (en) * | 1986-11-12 | 1989-09-19 | Mobil Oil Corporation | Limited entry, multiple fracturing from deviated wellbores |
| US4945991A (en) * | 1989-08-23 | 1990-08-07 | Mobile Oil Corporation | Method for gravel packing wells |
-
1991
- 1991-08-16 US US07/745,657 patent/US5161618A/en not_active Expired - Lifetime
-
1992
- 1992-08-14 DE DE4292758A patent/DE4292758B4/en not_active Expired - Lifetime
- 1992-08-14 WO PCT/US1992/006834 patent/WO1993004268A1/en active Application Filing
- 1992-08-14 DE DE4292758T patent/DE4292758T1/en active Pending
- 1992-08-14 RU RU94017659A patent/RU2103495C1/en active
- 1992-08-14 AU AU24914/92A patent/AU665570B2/en not_active Expired
- 1992-08-14 CA CA002115368A patent/CA2115368C/en not_active Expired - Lifetime
- 1992-08-14 GB GB9402956A patent/GB2273308B/en not_active Expired - Lifetime
-
1994
- 1994-02-14 NO NO940507A patent/NO309739B1/en not_active IP Right Cessation
Also Published As
| Publication number | Publication date |
|---|---|
| NO940507D0 (en) | 1994-02-14 |
| US5161618A (en) | 1992-11-10 |
| DE4292758B4 (en) | 2006-06-01 |
| RU2103495C1 (en) | 1998-01-27 |
| AU665570B2 (en) | 1996-01-11 |
| NO309739B1 (en) | 2001-03-19 |
| AU2491492A (en) | 1993-03-16 |
| CA2115368A1 (en) | 1993-03-04 |
| GB9402956D0 (en) | 1994-04-13 |
| DE4292758T1 (en) | 1997-07-24 |
| WO1993004268A1 (en) | 1993-03-04 |
| GB2273308B (en) | 1995-06-28 |
| GB2273308A (en) | 1994-06-15 |
| NO940507L (en) | 1994-02-14 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CA2115368C (en) | Method for producing multiple fractures from a single workstring | |
| US5161613A (en) | Apparatus for treating formations using alternate flowpaths | |
| EP1305503B1 (en) | Fracturing different levels within a completion interval of a well | |
| CA2187644C (en) | Method for fracturing and propping a subterranean formation | |
| US5560427A (en) | Fracturing and propping a formation using a downhole slurry splitter | |
| EP0774042B1 (en) | Method of fracturing and propping a formation | |
| US6464007B1 (en) | Method and well tool for gravel packing a long well interval using low viscosity fluids | |
| CA2210418C (en) | Method for fracturing and gravel-packing a well | |
| AU2001278984A1 (en) | Fracturing different levels within a completion interval of a well | |
| US6588506B2 (en) | Method and apparatus for gravel packing a well | |
| US5113935A (en) | Gravel packing of wells | |
| US5947200A (en) | Method for fracturing different zones from a single wellbore | |
| AU2002259298A1 (en) | Method and apparatus for gravel packing a well | |
| GB2289489A (en) | Treating formations using alternative flowpaths |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EEER | Examination request | ||
| MKEX | Expiry |