Search Images Maps Play YouTube News Gmail Drive More »
Sign in
Screen reader users: click this link for accessible mode. Accessible mode has the same essential features but works better with your reader.

Patents

  1. Advanced Patent Search
Publication numberUS2629445 A
Publication typeGrant
Publication dateFeb 24, 1953
Filing dateNov 23, 1946
Priority dateNov 23, 1946
Publication numberUS 2629445 A, US 2629445A, US-A-2629445, US2629445 A, US2629445A
InventorsDill Glenn A
Original AssigneeKinley John C
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Pipe severing method and apparatus
US 2629445 A
Abstract  available in
Images(1)
Previous page
Next page
Claims  available in
Description  (OCR text may contain errors)

FIPEoi o@ 299299495 Feb. 24, 1953 G. A. DILL 2,629,445

/ PIPE SEVERIN@ METHOD AND APPARATUS j Filed Nov. 23,9946 j? 4 la l5 35 j$;\'\-l\\f\1`lfl/ 9 ff j, jjj ')rj +9159? 33 l :Jbl/:rl/J *as "pf 32 "Tf .M7-7 f E: if? 5 i6 a7' a7 T1 ,-a* 9 5| "9 ao' 3" 18 ao a: 5 aa ,w 30 a' i 7 D a 8) ..3 43 e. 59 47 7 44 53* Wfl/4 A 37 INVENToR.

AT TURA/E 'las Patented Feb. 24, 1953 PIPE SEVERING METHOD AND APPARATUS.

Glenn A. Dill, El Dorado, Ark., assignor to John C. Kinley, Houston, Tex.

Application November 23, 1946, Serial No. 711,901

12 Claims.

The invention relates to a method and apparatus for severing pipes and other elongated objects, and in particular for severing pipes, rods, and the like in wells.

An object of the invention is therefore to provide a method of and apparatus for severing pipes and other elongated objects stuck in wells.

A further object is to provide a device that can be adjusted to be lowered to any desired depth in a pipe, or adjacent an elongated object, and then produce a heating of the pipe or elongated object at such depth so as to reduce the tensile strength thereof whereby severing of the pipe can be readily eiected.

Another object is to treat a pipe or elongated object at a point thereon to reduce its tensile strength and to then sever such object by the application of tension thereto.

Still another object is to provide a method of severing stuck pipe in wells in a manner that the severed end of such pipe is of a reduced diameter whereby an overshot or other retrieving tool may engage the remaining portion of the severed pipe.

A still further object is to provide a device that may be lowered to a predetermined position in a string and suicient heat generated and supplied to the said string so that4 tension upon the string will effect severing thereof.

Still another object is to provide a device that approximately determines the level at which a pipe or elongated object is stuck in a well bore.

Other objects and advantages will become apparent from a consideration of the following description and drawings wherein:

Fig. 1 is a vertical sectional View of a tubular member showing the device positioned therein;

Fig. 2 is an elevational view showing a portion of a tubular member in section with the device therein, such tubular member being stuck within a well bore; and

Fig. 3 shows the lower end of the device in section showing the gas chamber embodied in the device.

In Fig. 1 the device is shown as comprising a container 2 positioned in the tubular member 3, which member is shown as being stuck in the well bore. The container 2 is divided into chambers 4, 5, and 6 by fixed partitions 1 and 8. A slidable partition 9, tted in chamber 4, is provided with annular lip seals Il secured in position by discs I I threaded onto flange member I2.

The stop element I3 extending transversely of the chamber 4 above the partition limits the upward movement of such slidable partition.

This partition is arranged to move downwardly into chamber 4 in response to well pressure on its upper surface I4 until such pressure is equalized by the compression pressure on the nether surface I5 tending to urge the partition upwardly.

A ratchet wheel I 6 is pivoted at I1 in the chamber 5. The pawl I8 is connected at I9 to lever 20, and is provided with suitable means such as a spring to urge the pawl into movable engagement with the teeth on theratchet wheel to effect rotation thereof in a manner and for a purpose to be more fully described. The lever 2B pivoted at 2l extends through window 22 in the container 2 and terminates in nger 23 adjacent the inner wall of the member 3. Stop 24 pivoted at 26 and held against ratchet wheel I6 by spring 21 prevents backward movement of the ratchet wheel I 6. The finger 23 is held in sliding contact with the inner surface of member 3 by spring 20' and as nger 23 passes the joint 26 a rocking motion will be imparted to lever 20 by nger 23, each such rocking motion causing the pawl I8 to move ratchet wheel forward a notch.

A slot 2'! in wheel I6 is arranged so as to come into alignment with plunger 28 on the end of rod 29 as will be more fully described, such rod being constantly urged upwardly against wheel I6 by spring 30. Extension 3l of rod 29 ends in point 32 arranged to fire the cap 33 in the cap hole 34 adjacent the heat generating compound 35 in the chamber 5.

Anchor or container supporting means, comprising arms 31 pivoted at 38 on rod 29, extends outwardly through windows 39 and is arranged to engage member 3 when rod 23, is in actuated position as shown in Fig. 1. It is to be understood that such supporting means is normally in retracted position during descent of the container.

The lower end of rod 29 terminates in the chamber 6 in a rocker arm 40 connected at 4I to the rod 29 and pivotally connected at 42 to the container 2. The rocker valve 40 is terminated in valve face 43 arranged to sealably engage the seat 44 of passage 45 through the thickened wall section '46 of the container 2.

Partition 41 is similar to partition 9 and serves to prevent iiuid from contacting the gas generating compound 48 provided within the chamber 6. Stop 49 limits upward movement of partition 47.

In operating the disclosed device embodying the invention, the ratchet wheel I6 is rotated until the number of teeth on the periphery thereof counting from the slot 21, is equal to the number of joints which the container passes in lowering to the desired depth. A quantity of heat generating compound 35 of the exothermic type such as a mixture of aluminum oxide and iron, commonly known as Thermite, is placed in the chamber 4.

While the above mixture has been denoted as being suitable, it seems obvious that any suitable material capable of producing an exothermic reaction can be used to effect heating of the pipe.

A percussion cap 33 is placed in the cap hole 34 and a gas generating compound 48 which-produces gas when mixed with water, such as calcium carbide, is placed in the chamber 6. Partition members 9 and 41 are then placed in position, and the bottom 56 of the container 2 secured in place; the device may then be lowered into the well. It seems obvious that the device may be dropped into the well bore, or it may be lowered by means of a cable.

As the nger 23 slides along member 3, it comes in contact with joints 26 along the string which causes lever 2U to rock thereby actuating pawl I8 to engage each succeeding tooth on ratchet Wheel I6 thereby rotating such wheel one notch each time the iinger 23 engages a joint in the string. It is understood, of course, that plunger 28 bears against the teeth on the ratchet wheel due to the compression in spring 3D.

When the slot 21 comes in alignment with the plunger 28 in rod 29, the plunger moves upwardly due to the compression on spring 30. This upward movement causes container supporting means 31 to move outwardly to engage member 3 thereby positioning the container 2 in the well. Simultaneously rocker arm valve 40 moves upwardly off seat 44 and allows entry of well iluid to contact gas generating compound 48, such reaction evolving gas so as to form a bubble I about container 2, such bubble having liquid boundaries as indicated at 52 and 53. It seems obvious that the aforementioned operations occur within the space of a fraction of a second and immediately thereafter the point 32 on the extension 3| contacts the cap 33 causing the heat generating compound 35 to evolve heat directly to the surrounding member 3. A tension is exerted upon members 3 at the top of the well bore so as to cause such member to neck and finally sever while the member is heated to such an extent that the tensile strength thereof is materially reduced.

It seems obvious that the diameter of the necked portion will be much smaller than the normal diameter of the pipe;J thus enabling the operator to easily engage such severed portion with an overshot or other grappling tool if an effort is to be made to remove an additional portion of the string stuck in the well.

It seems obvious that the device may be used as a means to locate the level at which a string is stuck in the well bore. By using a series of the devices embodying the invention, and by starting at the lowest possible point in the string with the iirst device, and step wise moving upwardly to discharge each device at a higher level, the position or level at which the string is stuck may be located.

So long as the heating of the string is effected below the level at which the pipe is stuck, the string will not part when tension is placed thereon in unison with the heating, since the tension will not be transmitted to the level of heating.

The container is of any suitable material, such as plastic, so that it is dissipated during the heating of the member 3 thereby reducing debris in the string, or well bore, so that further operations will not be greatly hindered.

Broadly the invention contemplates an apparatus and method for effecting the separation of a tubular member or other elongated object stuck in a well bore by applying heat above such stuck position and applying a tension to the stuck pipe to pull it in two.

The invention claimed is:

l. In a device for generating and applying heat to effect separation at a predetermined level about the periphery of a tubular string stuck in a well the combination of, a container adapted to be lowered into the well, said container having a chamber therein to receive a quantity of heat generating material, means to anchor said container in the well at the predetermined level, and means operable by said anchor means for initiating reaction of the material whereby the string is heated about its periphery at such level.

2. In a device for generating and applying heat at a predetermined area to a tubular string stuck in a well the combination of, a container adapted to be lowered into the well, said container having a chamber therein to receive a quantity of heat generating material, means operable for initiating reaction of the material whereby the string is heated at such level, and additional means for creating a volume of gaseous iiuid about the container while the reaction within the material takes place.

3. In a device for generating and applying heat at a predetermined level to a tubular string stuck in a well the combination of, a container adapted to be lowered into the well, said container having a chamber therein to receive a quantity of heat generating material, and means operable by passage of the device through a predetermined length of tubular string for initiating reaction of the material Within said chamber.

4. In a device for generating and applying heat at a predetermined level to a tubular string stuck in a well the combination of, a container adapted to be lowered into the well, said container having a chamber therein to receive a quantity of heat generating material, and means operable by passage of the device through successive joints for initiating reaction of the material when a predetermined level is reached.

5. In a device for generating and applying heat at a predetermined level to a tubular string stuck in a well the combination of, a container adapted to be lowered into the well, said container having a chamber therein to receive a quantity of heat generating material, and means operable by passage of the device through a predetermined number of joints in the pipe string for anchoring the device within the string and initiating reaction of the material when the selected level is reached.

6. The method of removing from a well a portion of a string stuck therein comprising the steps of, applying heat to an area of the string at a selected point in the well to decrease the tensile strength of the string at such point, and applying tension to the string to effect separation at the heated area.

'7. The method of locating the level where a string of pipe is stuck in a well comprising the steps of, applying heat to the area of the string at a series of selected points in the well to decrease the tensile strength of the string, and

applying tension to the string to effect separation of the string of pipe at the rst heated area above the level of sticking whereby the levels at which the pipe does not separateV will indicate the level at which the pipe is stuck in the well.

8. The method of severing pipe stuck in a well comprising the steps of heating the pipe proximate the area where the pipe is stuck to decrease the tensile strength of such area and applying tension to the string to effect reduction in size of the pipe and separation at the heated area into an upper and lower portion, the reduction in size of the pipe leaving the upper end of the lower portion reduced in size to facilitate the engagement of such portion with a grappling tool, removing the upper portion of such cut pipe from the well bore, engaging the lower portion of such cut pipe and subsequently removing it from the well bore.

9. The method of removing from a well a portion of a string stuck therein and surrounded by well fluids comprising the steps of, applying tension to said string, providing a bubble in the fluids at a predetermined level, and applying heat to the string at that level to decrease the tensile strength of the string so that separation is eiected by said applied tension.

10. The method of removing from a well a portion of a string stuck therein comprising the steps of, applying tension to the string and applying heat to an area of the string at a selected point in the well to decrease the tensile strength of the string at such point so that separation of the string is eected by said applied tension.

11. The method of locating the level where a string of pipe is stuck in a well comprising the steps of, applying a tension to the string and applying heat to the string at a series of seselected points in the well to decrease the tensile strength of the string so that separation of the string of pipe at the rst heated area above the level of sticking is accomplished.

l2. In a pipe joint counting mechanism for locating a device at a predetermined number of joints below the surface in a string of pipe in place in a well bore, means to register movement of said mechanism through successive joints and means actuated by said registering means to sever the pipe when the device is located at the predetermined joint.

GLENN A. DILL.

REFERENCES CITED The following references are of record in the le of this patent:

UNITED STATES PATENTS Number Name Date 1,383,670 Stephens July 5, 1921 1,582,184 Mims Apr. 27, 1926 1,641,483 Greene Sept. 6, 1927 2,037,938 Spencer Apr. 21, 1936 2,144,208 Van Meter Jan. 17, 1939 2,200,505 Kerr May 14, 1940 2,201,290 Greene May 21, 1940 2,292,938 Hennessy Aug. 11, 1942 2,436,036 Defenbaugh Feb. 17, 1948 2,476,137 Doll July 12, 1949 2,525,391 Bates Oct. 10, 1950

Patent Citations
Cited PatentFiling datePublication dateApplicantTitle
US1383670 *Jul 20, 1920Jul 5, 1921Huff Process CompanyHeating apparatus for use in oil-wells
US1582184 *Mar 3, 1924Apr 27, 1926Mims Sidney WMethod and means for perforating well casings
US1641483 *Apr 8, 1925Sep 6, 1927Greene Haskell MMeans for cutting oil-well casings and drill pipe
US2037938 *Oct 10, 1934Apr 21, 1936Technicraft Engineering CorpCollar breaker
US2144208 *Aug 19, 1935Jan 17, 1939Hercules Oil Well Shooting ComMethod and means for increasing the flow of fluid from well casings
US2200505 *Aug 30, 1938May 14, 1940Eldon Peek JLocating device for use in boreholes
US2201290 *Mar 4, 1939May 21, 1940Greene Haskell MMethod and means for perforating well casings
US2292938 *Nov 6, 1939Aug 11, 1942Durant Mfg CoConduit measuring device
US2436036 *Sep 14, 1944Feb 17, 1948Defenbaugh Loyd FMeans for severing well casings and the like in place in the well
US2476137 *May 16, 1942Jul 12, 1949Schlumberger Well Surv CorpMethod of positioning apparatus in boreholes
US2525391 *Jul 12, 1948Oct 10, 1950Edith L O NeillApparatus for cutting drill pipes
Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US2842207 *Sep 6, 1955Jul 8, 1958Alexander Ford IMethod and apparatus for disconnecting well pipe joints
US2871946 *Apr 20, 1956Feb 3, 1959Baker Oil Tools IncApparatus for effecting operation of subsurace well bore devices
US3019840 *Jun 25, 1958Feb 6, 1962Kennard Thomas ARetrieving tool
US3076507 *May 16, 1958Feb 5, 1963Sweetman William GChemical cutting method and apparatus for use in wells
US3087546 *Aug 11, 1958Apr 30, 1963Woolley Brown JMethods and apparatus for removing defective casing or pipe from well bores
US3227214 *Sep 20, 1960Jan 4, 1966Whann Rural WMethod and apparatus for removing a pipe from the well
US3255822 *Mar 26, 1962Jun 14, 1966Conrad Martin BActuator device
US3447604 *Jul 13, 1967Jun 3, 1969Kinley John CSafety assembly for impact-actuated well tool
US4105070 *Sep 19, 1977Aug 8, 1978Schlumberger Technology CorporationMethods for determining the stuck point of a conduit in a borehole
US4105071 *Sep 19, 1977Aug 8, 1978Schlumberger Technology CorporationMethods and apparatus for determining the stuck point of a conduit in a borehole
US4125161 *Sep 6, 1977Nov 14, 1978Weatherford/Dmc, Inc.Chemical cutting apparatus and method for use in wells
US4158389 *Mar 9, 1978Jun 19, 1979Weatherford/Dmc, Inc.Chemical cutting apparatus and method for use in wells
US4180131 *Oct 20, 1978Dec 25, 1979Weatherford/DmcChemical cutting apparatus for use in wells
US4250960 *Dec 19, 1979Feb 17, 1981Weatherford/Dmc, Inc.Chemical cutting apparatus
US4947534 *Sep 7, 1989Aug 14, 1990Davenport William CApparatus and method for salvaging concentric piping members
US5636692 *Dec 11, 1995Jun 10, 1997Weatherford Enterra U.S., Inc.Casing window formation
US5709265 *Jul 30, 1996Jan 20, 1998Weatherford/Lamb, Inc.Wellbore window formation
US5791417 *Dec 4, 1996Aug 11, 1998Weatherford/Lamb, Inc.Tubular window formation
US6024169 *Oct 24, 1997Feb 15, 2000Weatherford/Lamb, Inc.Method for window formation in wellbore tubulars
DE2816248A1 *Apr 14, 1978Oct 26, 1978Weatherford DmcVorrichtung zum chemischen schneiden von gegenstaenden in bohrloechern von oel- oder gasfeldern
Classifications
U.S. Classification166/255.1, 166/297, 235/91.00R, 166/63, 166/55, 166/64, 166/58, 166/214, 166/55.1
International ClassificationE21B29/00, E21B29/02
Cooperative ClassificationE21B29/02
European ClassificationE21B29/02