US 2575105 A
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J. H. HART ET AL TELESCOPING TAIL PIPE Nov. .13, 1951 Filed Sept. 1, 1950 S'Sheets-Sheet 1 ATTORNEYS Nov. 13, 1951 Filed Sept. 1, 1950 3 Sheets-Sheet 2 INVENTORS ATTORNEYS J. H. HART ET AL TELESCOPING TAIL PIPE Nov. 13 1951 5 Sheets-Sheet 3 Filed Sept. 1, 1950 Patented Nov. 13, 1951 UNITED STATES PATENT OFFICE Jean H. Hart and Ray H. Hart, El Reno, Okla.
Application September 1, 1950, Serial No. 182,662
9 Claims. 1
This invention relates to a telescoping anchor or tail pipe used in oil wells for anchoring a tube or packer in an open hole or other formation, and in particular the telescoping anchor pipe includes a section of a stringer pipe that rests upon the bottom of the hole and a sectional string of a smaller diameter than telescopes into the pipe resting upon the bottom of the hole and suitable slips, hooks and other anchoring and operating elements connecting the smaller sectional string to the tubular base or section resting upon the bottom of the hole.
The purpose of this invention is to provide means for lengthening and shortening a string of pipe in an oil well without pulling the pipe from the well.
In the conventional type of well casing it is necessary to pull the casing from the well to lengthen or shorten the string. Furthermore in maxing tests of fluid at dinerent points in a well it is often desirable to raise or lower the base or tail pipe of a string in a well and ordinarily it is necessary to pull the casing in order to change the elevation of the base or tail pipe. With these thoughts in mind this invention contemplates a combination of slips, anchors and operating means therefor carried by the lower end of a string which telescopes in the tail pipe of a well casing and in which the parts are actuated from the upper end of the string.
The object of this invention is, therefore, to provide an improved connecting structure between a stringtelescoping in a tail pipe of a well casing and the tail pipe in which the parts may be operated by the upper end of the string and without pulling the string from the well.
Another object of the invention is to provide a method for resetting slips in an anchor or tail pipe of a well casing by contacting the bottom of the tail pipe or tool.
Another object of the invention is to provide an improved telescoping anchor pipe for wells wherein tripping of holding elements in the device is accomplished by contacting the upper end of the anchor or tail pipe.
Another object of the invention is to provide an improved telescoping anchor pipe for well casings in which the inner telescoping joint or elements of the telescoping tube are held by indentations in the inner surface of the anchor or tail pipe.
A further object of the invention is to provide an improved construction of telescoping anchor or tail pipes of well casings in which the parts are of a comparatively simple and inexpensive design.
- in relation to the anchor pipe whereby the lower end of the inner tube may be locked at different elevations in the anchor pipe and also whereby the anchor pipe may be raised and lowered by the tube.
Other features and advantages of the invention will appear from the following description taken in connection with the drawings wherein:
Figure 1 is an elevational view with parts broken'away showing the inner telescoping tube extended through a packing gland in the upper end of the anchor pipe.
Figure 2 is a vertical section through the lower end of the anchor pipe showing the locking elements and'trips in the free positions.
Figure 2a is a similar view showing the upper art of the anchor pipe. I
Figure 3 is a view similar to that shown in Figure 2 showing the inner locking elements with the inner telescoping tube clamped in the outer anchor pipe.
Figure 4 is a similar view showing the inner telescoping tube withdrawn slightly wherein the slips are released from the inner threads of the anchor pipe. 7 p i Figure 5 is also a similar view showing the parts released whereby the inner holding elements and slips are free to move upwardly in the anchor pipe.
Figure 6 is a view showing the parts with the upper elements released and with the ends of a pin extended from a sleeve on a shaft of the tele-.
scoping string in engagement with a ring on the inner surface of the anchor pipe whereby the anchor pipe may be raised by the string.
Figure '7 is a vertical section through the up per end of the anchor pipe illustrating the mounting'of the string therein.
Figure 8 is a cross section through the anchor Figure 10 is also a similar section taken on line l'0'lll of Figure 2 illustrating the'segments of the slips. Figure "11 is a detail illustrating-a sleeve with the ' foot sections of threeinch pipe, an inner telescoping string H which may be formed of two inch pipe, a plurality of segments |2 forming slips,
a spreader |3 having a conical shaped outer surface, a sleeve |4 having legs l5 and lfiextended downwardly therefrom, a vertically disposed rod I! having gripping dogs |8 on the lower end, an
extension l9 positioned to engage the lower end of a bull plug 2|, springs 22 and 23, anda;
packing gland 24 that is positioned around the string and threaded in the upper end of a spacing sleeve 25 that is threaded in the upper end of the anchor pipe l0.
, The anchor pipe II] is formed as shown with spaced annular rings forming teeth 26 on the inner surface, with the'outer surface of the lower end threaded into the upper end of the bull plug or base 2| as shown at the point 21 and with I the upper end provided with internal threads 28 into which an annular ring 29 of the spacing sleeve or collar 25 is threaded.
The collar 25 is provided with an annular recess 30 for packing 3| and a bronze ring 32 is positioned to coact with the packing to prevent galling or freezing of the pipe. A packing nut 33 is threaded in the upper end of the collar 25 to retain the ring and packing in position. From the collar 25 the inner tubular string, which is preferably formed of two inch pipe sections is coupled to superimposed sections by suitable coupling members and for this reason the string is provided with threads 34,'as shown in Figure 2a.
The lower end of the string is provided with internal threads 35 into which a hub 36 on the upper end of a sleeve or tubular casing 3! is threaded, as shown in Figure 2, and the outer surface of the hub is provided with projections 38 that are positioned to engage an inner annular ring 39 in the upper part of the outer casing or pipe ID. The lower part of the hub 36 is provided with perforations 40 that establish communication between the interior of the string and the interior of the anchor pipe I. The lower end of the hub 36 is also provided with a shoulder 4| that is positioned to be engaged by a washer 42 on the upper end of the rod I! with the parts in the position shown in, Figure 2, and by this means the inner gripping elements are forced downwardly as the string is moved downward. The washer 42 is threaded on the upper end of the rod I! and the rod extends downwardly through the conical shaped spreader |3 which is formed on the lower end of a tube 43 that is provided with an outer annular flange 44, spaced from the lower end and an inner annular flange 45 on the upper end. The tube 43 is also provided with elongated slots 46 and 41 through which pins 48 and 49 which are threaded into openings in the sleeve l4 through studs 50 and 5| on the inner ends extend.
The tube 43 is slidably mounted in the tubular casing 3'! extended downwardly from the collar or hub 36 and the tubular casing 31 is provided with elongated slots 52 and 53 in which heads of screws 54 and. 55, threaded into the upper end of the tube 43 are positioned. A collar 56 is provided on the 4 flange 45 and the spring 22, the lower end of which is positioned around the collar 56, extends upwardly from the flange 45 to the washer 42. By this means downward movement of the string compresses the spring 22 and permits the heads of the screws 54 and 55 to move upwardly in the slots 52 and 53. Upon continued downward movement of the string II the spreader l3 enters the slip segments with the outer tapering surface thereof engaging the conical shaped inner surfaces of the segments l2 of the slips.
. The operation is illustrated in Figure 5 wherein the spreader is substantially midway of its downward movement and the action continues until the lower end of the extension |9 engages the surface 20 of the bull plug 2|. In this movement, and before the lower end of the extension I9 reaches the surface 20 of the bull plug the lower ends of the legs I5 and I6 of the sleeve |4 contact the surface 20 whereby the sleeve I4 is moved upwardly to release the dogs l8 so that the dogs spring outwardly to engage the lower surface of a bushing 51, the lower end of which is provided with threads on which a ring 58 is positioned and the upper end of which is provided with a flange 59 that is held in position by a ring 60, secured to the lower ends of the segments |2 of the slips by screws 6 I. With the parts in this position, as illustrated in Figure 3, upward movement of the string draws'the sleeve 31 and also the tube 43 upwardly, as shown in Figure 2 and in this movement the spreader I3 is drawn upwardly by the spring 22 thereby releasing the slips.
The dogs |8 nest in spaced longitudinally disposed grooves 62 in the rod l1 and the lower end of the rod is provided with a cone B3, in the lower end of which the extension 9 is threaded.
A washer 64 is secured on the lower end of the extension l9 by a nut 65 and, as illustrated in Figure 2 upon upward travel of the rod I! the washer 64 engages the lower end of the bushing 5'! and collar 58. The anchor pipe H] is threaded into the upper end of the bull plug or base 2| providing a complete closure member and the inner annular ring 39 provides a stop ring which, positioned to be engaged by the pins 48 and 49 of the sleeve l4 prevents the string I being withdrawn from the anchor pipe It. By this means it is also possible to draw the anchor pipe from the well by the telescoping tube or string.
With the parts arranged in this manner the anchor pipe is picked up and started into the hole or well being heldby the slips. These elements are conventional in oil 'wells of this type. The next joint of the inner tubing or string is secured to the tubing H by a collar or the like and the lower section with the anchor pipe thereon is lowered into the well. In the lowering movement the inner tube is telescoped into the anchor pipe. This actionis continued until the lower ends of the legs l5 and I6 engage the lower end of the bull plug whereby the sleeve 4 slides upwardly releasing the dogs [8 so that the dogs spring outwardly into gripping relation with the member 5'! extending downwardly from the segments of the slips. The end [9 of the rod l1 continues until it also engages the surface 20 of the bull plug, at which time the spreader l3 has forced the slips into engagement with the teeth 25 of the anchor pipe.
To adjust the position of the slips in the anchor pipe the string is drawn upwardly to the position shown in Figure 2 whereby the slips are released and with upward movement of the sleeve 21 the shoulder II also moves upwardly. whereby the spring 22 draws the rod I1 and extension 19 upwardly, the dogs l8 being crowded inwardly by the sleeve I4. Atthe same time the heads of thescrews 54 and 55, which extend into the slots 52 and 53 draw the tube 43 upwardly whereby the slips may be moved upwardly in the anchor tube or pipe, as illustrated in Figure 5. In the initial movement the dogs l8, beingcrowded inwardly by the sleeve [4 pass through the member 51, as shown in Figure 6.
The telescoping anchor pipe of this invention may be positioned at different elevations in a well and samples of oil, gas, or other fluid may be taken through the string. The perforations 40 provide communicating means between the interior of the anchor pipe l0 and the string or tube V This device provides means whereby the slips l2 in an oil well telescoping anchor pipe may be reset at different positions in the outer casing or anchor pipe Ill by engagement of the lower end of a rod extended from the string with the plug or lower end of the outer casing. Furthermore engagement of the pins 48 and 49 or of the annular ring 38 with the lower end of the packing gland or collar in which the gland is mounted provides tripping means for releasing the elements whereby the anchor pipe may be drawn upwardly to a different elevation in a well.
. The inner edges or threads 26 of the tubular casing I0 and the annular ring 38 of the string ll provides gripping and tripping elements whereby the parts of the anchor are actuated through the string from the upper end of the well without pulling the well casing or parts thereof. By this means it is also possible to add sections in the two inch pipe or string between the anchor and upper end ofthe well.
It will be understood that although it has been suggested that the anchor pipe [0 is formed of three inch pipe and the string l l of two inch pipe, pipe of any suitable size may be used. j
In order to facilitate the action of the hooks or dogs l8 an inner annular ring 66 is provided in the bull plug 2| to hold back the ring 58 in the downward movement so that it will compress spring 23 and permit the hooks 18 to catch under the ring 58. This gives the slips 12 their tendency of an upward movement against the tapered spreader 13 causing the slips [2 to be positively engaged in the teeth '26 of the pipe [0.
The slips I2 which include a plurality of segments may also be described as forming parts of a split nut having a smooth or straight inner surface with the outer surface threaded for the purpose of retraction and expansion. The threads on the outer surface of the said split nut are positioned for mating with threads on the inner surface of the pipe Ill. The parts generally referred to as conventional slips cling to a smooth surface wall whereas a split nut, regardless of the number of times it is split clings to the mating threads cut into the inner surface of the wall of a surrounding tube or pipe.
With the threads or annular rings formed with flat horizontally disposed upper surfaces on the inner surface of the well casing or pipe the resulting force from the Weight of the parts is vertical providing a downward force whereas the conventional slips that are forced outwardly against the inner surface of a smooth wall grip with a lateral thrust and the downward force taken along the outer surfaces of the parts of the split nut transmitted to horizontal surfaces a load on'the tube of one hundred thousand pounds ofldownward force can be released by an upward force of ten pounds whereas the lateral force required to hold slips against a smooth surface required a force many times as great-to release the holding elements.
It will be understood that other modifications may be made in the designand arrangement of the parts without departing from the spirit of the invention.
- What is claimed is:
1. In a telescoping anchor pipe, an outer tubular casing, an inner tubular string telescoping in the outercasing, slips positioned between the string and outer casing providing gripping means between the string and casing, and means resetting the slips by engagement of means on the end of the string with the lower end of the outer casing.
2. In a telescoping anchor pipe, an outer tubular casing, an inner tubular string telescoping in the outer casing, latching means between the string and outer casing for holding the string in relation to the casing, and means tripping the latching means upon engagement of an extension on the string with the upper end of the outer casing.
3. In a telescoping anchor pipe, the combination which comprises anouter tubular casing having gripping means on the inner surface, an inner tubular string telescoping in the outer casing, latching means carried by the inner tubular string and positioned to coact with the gripping means of the outer casing, means resetting the latching means by engagement of the lower end of the string with the lower end of the outer tubular casing, and means releasing the latching means by engagement of an extension on the tubular string with the upper end of the outer tubular casing.
4; A' telescoping anchor for well casings comprising an anchor pipe, a well string telescoping in' said anchor pipe, a sleeve extended from the lower end of the well string, a tube having a spreader 'on the lower end slidably mounted in the sleeve, slips having sloping inner surfaces mounted in theanchor pipe and positioned to be engaged by the spreader for urging the slips into gripping relation with the inner surface of the anchor pipe, means carried by the string for elevating the slips, and means whereby the slips are released from the anchor pipe from the upper end of the string.
5. In a telescoping anchor for well casings, the combination which comprises an anchor pipe having a threaded inner surface, a well string telescoping in the anchor pipe, slips positioned in the anchor pipe and having threaded outer surfaces to coact with the threaded inner surface of the anchor pipe, and means carried by the well string for actuating the slips.
6. In a telescoping anchor for well casings, the combination which comprises an anchor pipe having a threaded inner surface, a well string telescoping in the anchor pipe, slips positioned in the anchor pipe and having threaded outer surfaces to coact with the threaded inner surface of the anchor pipe, means carried by the well string for expanding the slips into gripping relation with the threads of the anchorpipe, and means extended from the lower end of the well string for releasing the expanding means of the slips, and means also carried by the lower end of the well string for resetting the slips.
7. In a telescoping anchor for well casings, the
combination: which .comprises-. am anchor: pipe"- having..atthreadediinner :surface'; a. bulljplugzcareried by. thelower: end ofithecanchor pipe;-.,a:,wellsv string-1 telescopingcinith anchorcpiney. a1 tubulan casingshaving: elongated lslot's :therein carried: the Well string, vatubetltlaving :a;spreader:onzthe; lowerrend and alsoshaving't' elongated slot'sztherein slidably: mounted: in thnctub'ular casing; ..a "rod". slidably-"mounted. in the tube; saidro'd havingtta: washer on the upper end and elongatedrsldtsiirr the outer surface of the lowerfend';.. aspringrzpositioned between: the. upperren'dr. of; the tube; and
washer on theupper end ofctl'iemodr frmresilientlw urging; the: rod:v upwardly dogs; nested? in. the; elongated slots: in: the; lower; endg of; the rod;. at sleeve encasing; the dogsslidably,mountediomthe rod and havingdeg ssextendedi downwardlyytherew from, pins carriedby the upper. endofftl'ieslee e and extended throughthe elongatedslotsaof the; tube, .screwssextendedtfrom the-upper end; of the tube and positioned in the: elongatedslotsof. the: tubular casing carried by the. well string, a plu:-- rality of slipshaving sloping inner sunfacescppsie' tioned. to receive. the spreader of the tube said:
slipsrpositioned in the anchor pipe-and-having H serrated outer surfaces. positioned to; coactwith the threaded inner surface of the anchor pipe. means mountingthe.slips.t onsthe-lower. end of the saidrod; saiddogs-inthe-slots ofrthe rod: positionedrto engage: the mounting means of the: slips, and means :on thelowen end*of-.the:-rod.alsopositioned to engage themounting means rof the" slips, for resetting the slips.
8-. In:-a-..te1escoping anchor for well casingsgthe combination which comprises. an. anchorpipe having. azthreaded inner surface, a-lwell string} telescoping in the anchor. pipe-,- a=split nut.in-- eluding a plurality of segmentspositioned in-the: anchor. pipe, said. segments :hav-ing straight .inner; surfaces and threaded outer surfaces=and-posi-- tioned .to coactwith .the threaded inner surface of theanchor pipe, and meanscarriedbythe. well string ,for actuatingythe segments of the; split. nut'..
9'. In .atelescoping anchor. for welllcasingrth'e.
8 combination whiclr: comprises: an: anchor: pipe:- havingzraathreadediiinner surface; a:-bulljplug.carsried by; theil'ower J end of. the anchor; pipe,.,a' well string-telescoping inithe anchor. pipe; atub'ular.
casing .haying'elongatedzslots .therein carried by therwell st'ring,.a-tub'e having a spreader.omthev themed." upwardly; dogs nested; in the :elbngatedt slots.-in:the:-lowerend ofthe'rod; at'sleeve enca'sing: the"; dogs: slid ably. mounted 5011' the :ro dv and." havin g.-
legs extended downwardly therefrom, pins car-'- ried by the'zupper 'endiof the; sleeve and'extend'ed through the elongated; slotsofi' the tube; screws extended:- from: the upper: end' ofthe tube and. positioned inthe elongated slots of thettubular. casing carried by therwell string, a split nut v includinga plurality'ofseginents having straight y inner-surfaces positioned: to receive thespreader of the: tub'e,. said segments positioned in the: anchorpipe andihaving "serrated outer surfaces positionedztozcoa'ct withztherthreaded inner. surface? of the anchorpipe; meansimounting thesplit: nut on lower end .of'saidfrod, said Tdogs positioned to; engage: the" mounting means of the: split nut for: resetting, the segments: of the split nut.
'JEAN H; HART. RAY H.. HART.
REFERENCES A CITED Theifollowingreferences are of record-in'tlie' file of thispatent:
UNITED STATES PATENTS