US 3275079 A
Description (OCR text may contain errors)
Sept. 27, 1966 M. 1 cRow 3,275,079
DUAL STRING HYDRAULIC PACKER Filed Jan. 23. 1965 5 Sheets-5h69?. l
Sept. 27, 1966 M. 1 CROW DUAL STRING HYDRAULIC PACKER Filed Jan. 23, 1963 5 Sheets-Sheet 2 Morgan L. Crow ATTORNEY Sept 27, 1966 M. 1 cRow 3,275,079
DUAL STRING HYDRAULIC PACKER Filed Jan. 25, 1955 5 Sheets-Sheet 5 INVENTOR Morgan L. Crow Sept. 27, 1966 Filed Jan. 23, 1963 M. L. CROW DUAL STRING HYDRAULIC PACKER 5 Sheets-Sheet 4 INVENTOR Morgan I.. Crow ATTORNEY Sept. 27, 1966 M. L. CROW DUAL STRING HYDRAULIC PAGKER 5 Sheets-Sheet 5 Filed Jan. 23, 1963 INVENTOR Morgan l.. Crow ATTORNEY United States Patent O 3,275,079 DUAL STRING HYDRAULIC PACKER Morgan L. Crow, Dallas, Tex., assignor to Dresser Industries, Inc., Dallas, Tex., a corporation of Delaware Filed Jan. 23, 1963, Ser. No. 253,429 16 Claims. (Cl. 166-122) This invention is concerned with a well packer and is particularly concerned with a well packer which is set by hydraulic pressure, and which may be retrieved from the well.
The packer disclosed herein is of the dual type, having two passages therethrough for communication with separate zones of production in a Well.
Previous packers of this type have not been entirely satisfactory, in that it was necessary to provide a tension member within the packer to transfer the setting force between opposite ends of the packer sleeve, thereby necessitating the stretching or moving of the tubing in order to set the packer; it was necessary to rotate the tubing to release the packer, thus disturbing other tools in the well; and it was necessary to telescope the cylinder and piston to running-in position to retrieve the packer, thereby rendering it diflicult or impossible to retrieve the packer when the cylinder is compactedA with mud or debris found in the well; and no satisfactory means was provided for compensating for additional expansion of the rubber, or preventing unsetting of the rubber, allowing leakage thereby.
The present packer construction is intended to overcome the above recited shortcomings in prior packers of this type, and accomplish other objects, among which are the following:
The packer is anchored for setting by hydraulic anchors at the upper end of the packer assembly in such amanner that the casing serves as a tension member in setting, thereby permitting positive location of the tubing and eliminating the necessity that the tubing be moved or stretched in setting the packer, thereby assuring that other tools already set in the well, such as packers or other tools therebelow, will not be disturbed upon setting the packer.
The packer sleeve is held in expanded position by mechanical slips inside the packer, eliminating hydraulic pressure traps and the necessity for check valves.
Retrievability is made easier in that no rotation is required to release the packer. The packer may be released for retrieval by a simple upwardly exerted force on the tubing string which releases same at a predetermined pull.
It is not necessary to telescope the cylinder and piston to running-in position to release the packer. Therefore, debris and mud which might accumulate in the cylinder do not affect retrievability.
The hyd-raulic cylinder and piston are located above the packer rubber which permits direct downwardly acting force on the packer rubber in setting. l
Mechanical take-up slips located inside the packer improve the pack-01T and locks in increased expansion of the packer rubber by reason of reversal of pressure across the packer.
Internal slips inside the packer which are set by mechanical means, positively hold the packer in set position and may be positively retracted when pulling to permit full length relaxation of the packer sleeves.
Fluid by-pass is provided upon removal of the second tubing string which is' equivalent to the tubing area to provide ease in retrieving the packer.`
The hydraulic anchors at the upper end of the packer grip the casing to initially hold the packer while it is being set, and also hold the packer against upward pressure from below after the packe-r is set.
Other and further objects of the invention will become apparent upon reading the detailed specification hereinafter following, and by referring to the drawings annexed hereto.
A suitable embodiment of the invention is shown in the attached drawings, wherein:
FIGURES I, I-A, and I-B show a cross-sectional, elevational View of the packer assembly incorporating the improvements described and claimed herein;
FIGURES II, II-A and II-B show a cross-sectional, elevational view taken on the line II-II of FIGURES I, I-A and I-B;
FIGURE III is a cross-sectional, elevational View in semi-diagrammatic form illustrating the position of the various parts of the packer assembly in set position in the casing;
FIGURE IV is a view similar to FIGURE III, but showing the relative positions of the parts of the packer assembly after it has been relaxed for retrieval from the Well;
FIGURE V is a transverse, sectional view taken on the line V--V of FIGURE I;
FIGURE VI is a transverse, sectional view taken on the line VI-VI of FIGURE I;
FIGURE III is a transverse, sectional view taken on the line VIInVII of FIGURE I-A;
FIGURE VIII is a transverse, sectional View taken on the line VIII-VIII of FIGURE I-A;
FIGURE IX is a transverse, sectional view taken along the line IX-IX of FIGURE I-A;
FIGURE X is la transverse, sectional view taken along the line X-X of FIGURE I-A;
FIGURE XI is a transverse, sectional View taken along the line XI-XI of FIGURE I-A;
FIGURE XII is a transverse, sectional View taken along the line XII-XII of FIGURE I-B; and
FIGURE XIII is a perspective exploded view of the spring carrier, slip pick-up, slip guide, slip rest bodies and slip bodies assembly.
Numeral references are employed to designate the various parts shown in the drawings, and like numerals indicate like parts throughout the various ligures of the drawings.
The numeral 1 indicates an entry scoop which has conical entry surface 1a therein to guide the stinger on the secondary tubing string into the secondary passage for latching same therein.
The entry scoop has parallel passages 2 and 3 provided therethrough, which are in alignment with the passages through the packer, as will be hereinafter described.
The entry scoopl is secured to the anchor body 5 by means of cap screws 1b and 1c.
The anchor body 5 has parallel passages 5a and 5b' i body has a plurality of anchor slip pistons 6 mounted thereon which are slidably disposed in bores 6a in the wall of the anchor body.
The )slips are slidably and .sealingly engaged with the wall of the bores 6a by means of seal rings 6b, and are biased inwardly by means of springs 6c which are abutted against retainer strips 6d which pass through longitudinal grooves f on the outer surface of the slip teeth. The
strips 6d are mounted on the body 5 by means` of screws 6e.
The piston slips 6 are actuated and moved outwardly by means of hydraulic pressure exerted through the secondary. tubing string 61 which passes through the ports 7 which communicate with connected passages 7a behind the pistons. v
The stationary piston or back-up 8 is secured to the lower end of the anchor body by means of a threaded connection collar 9 which has ya ange on the lower end thereof engageable with a shoulder ,onrthe upper end of the piston 8, and is threaded to the -lower end of the anchor body 5. An appropriate seal is provided between the connection collar 9 and the anchor body `5. The piston 8 could be made integral with anchor body 5, and in fact the body 5 and piston V8Y can be considered as one body herein.-
Primary and secondary seal sleeves 10 and 11 are positioned between the aligned bores through the anchor body 5 and piston 8, said seal sleeves having resilient O-rings 10a and 11a positioned thereabout to provide appropriate seals about said passages.
A hollow cylinder 12 is slidably disposed about the piston 8, and an O-ring seal 13 is disposed in an appropriate channel about the piston 8 and sealingly and slidably contacts the inner wall of the cylinder 12 to provide a seal therebetween.
The piston 8 and the cylinder 12 are initially frangibly secured together by means of Vagshear screw 14 passing through the wall of the cylinder 12 the piston 8.
The primary mandrel or support 15 is threadedly engaged at the lower end of the primary passage 8a through the piston 8 by means of threads 15a; and the secondary mandrel, or tubular support 16, is attached in communication with the` secondary passage 8b by means of appropriate threads 16a. Y
The mandels 15 and 16 extend entirely throughjtfhe packer rubber assembly, and provide the primarysupports therefor. 7
O-ring seals 17 and 17a provide slidable seals between mandrels 15 'and 16, and the passages through the lower ends of the cylinder 12.
A mandrel slip support ring 18 has parallel passages and intorthe wall of therethrough and is disposed about the mandrels 1S and y 16, and is attached to the mandrel slip housing 19 by means of screws 18a. The mandrel slip khousing 19 `is surrounded by a support sleeve 19e which interlocks with the support ring 18, and has downwardly tapered parallel l passages 19a and 19b therethrough to receive the mandrels 15 and 16. There are disposed in the tapered passages a plurality of slips 20 which are guided and lheld' in' `alignment lby guide pins 21 extending nwardly'of passages 19a and 19b into slots 20a in the outer faces of slips 20.
The slips 20 have inner upwardly directed teeth thereon arranged to bite into the outer 'walls of the mandrels 15 and 16 when force is applied thereto in the manner hereinafter described.
The slip bodies 20 have tapered surfaces on the outer sides thereof which are arranged to seat against the corresponding tapered surfaces in the passages 19a and 19b through the mandrel slip housing 19, and the tapered surfaces are maintained in contact by means of springs 22, which are seated in sockets 20b provided in the upper surfaces of slip bodies 20 and `against the lower face of the support ring 18. v
The spring carrier housing l23 has parallel passages therethrough to receive the mandrels 15 and'16, and is attached to the slip guide 25 by means of a plurality of tie bolts 24 which extend through vertical bores in the wall l of housing 23 and are threadedly engaged in threaded .Vertical bores provided in the upper ends of the spaced sides 25a and 25b of slip guide 25. Set screws 23a attach spring carrier 23 to secondary mandrel 16.
of slip guide 25 has closed sides 25d. The slip bodies 26 l are slidably connected to sliprest bodies 28 by slidable dovetail connections, as indicated at 26a and the lower end ofthe slip pick-up 27 has inwardly tapered shoulders 30 f thereon against ywhich the slip rest bodies 28 are seated on corresponding tapered shoulders 28a thereon, and are slidably connected thereto by a dovetail connection, indicated at 28b (FIG. IX). n
The slip rest bodies 28 4are frangibly secured to the `slips 26 by Ymeans of shear pins 31, and are connected `to theY slip guide 25 ,by means of guide pins 32 which pass through the elongated slots 33 .provided therethrough and through aligned holes in the walls ofthe guide 25. The guide pins 32 are retained inrplacefby such screws 32a threaded into the holes through the wall of slip guide 25. The slip rest bodies 28 act as expanders for slips 26,* and are moved'and held outward by the tapered surfaces28a on slip rest bodies 28 and 30 on pick-up head 27.
It will be seen that the slip rests 28 are Ypermitted to move inwardly and, outwardly on the guide pins32 by virtue of the elongated slots 33 when pick-up head 27 is moved up and down. However, it will be observed that said ybores thereabove, which lare'held thereinbymeans y of screws 23d threaded into the upper ends of said bores.
. The lower ends of the slip follow pins 23b are positioned against the upper ends of the slip bodies 26 i-andthe springs 23a cause same to.v urge the slips downwardly along the contacting tapered surfaces between the slips and the slip rests 28 so as to urge the slips outwardly t'oward the wall of the casing 65 when the frangible; pins 31 are broken.
The slip bodies 26 have upwardly directedteeth onthe outer surfaces thereon which are arranged tobitingly engage the inner wall of Athe casing 65 lto anchor same thereto.
`Downwardly facing pickup shoulders 35are provided within the slip pick-up 27,;which are arranged to comel int-o contact with the pick-up-shoulder 34 on the primaryy mandrel 15 (FIGS. III and IV), to lift the slip `pick-.up 27 upwardly to permit the inward movement of the slip rests 28, to thereby release the slips 26 in the manner which will be hereinafter described.
When slip pick-up 27 thus moves upwardly upon relaxa. tion and retrieval ofthe packeryshoulders 36 on opposite` sides of slip pickup-27 Yengages a shoulder 36aV on .the spring housing 23 to lift the kspring housing upwardly and allowfslips 26 to move wretrieval from the-well. v
A plurality of packer sleeves 37, having aligned parallel i passages therethrough to receive the mandrels 15 and.16,
are separated by spacer plates 38 and supportedV at each; end by end support plates 39.= ,Upper support plate39;
isattached to the `lower end of slip guide 25.
A lower expander head 40 is attached` to the lower packer support 39 and has parallel passages therethrough to receive the mandrels 15 and 16.
y The expander head 40 has tapered surfaces 40a thereon f which are slidably connected to the inner corresponding inwardly to release same for tapered surfaces 41a of the anchor slips 41 by means of a dovetail connection indicated at 42.
The expander head 40 is secured to the primary mandrel by means of set screws 43.
A slip carrier 44, having parallel passages therethrough to receive the mandrels 15 and 16, has slip retainers 44a attached to at surfaces on the outer sides thereof, by means of screws 45. The slip carriers 44 support the slip bodies 41 by means of slidable connections therebetween so that the slip bodies 41 may move outwardly with relation thereto by reason of relative slidable movement between the tapered surfaces 41a and 40a. The slip support assembly just described is frangibly secured to the secondary mandrel 16 by means of a shear pin housing 46 attached to the slip carrier 44 by means of screws 47, which shear pin housing is frangibly secured t-o the secondary mandrel 16 by means of shear pins 48 (FIG. XII).
A downwardly facing pick-up shoulder 49 is provided in the secondary passage through the expander heads 40, which is arranged to contacta pick-up shoulder 50 provided on the secondary mandrel 16 to retrieve the packer `assembly out of the well after breaking the shear pins 48 and relaxing the packer in the manner hereinafter described.
A seating sub 51 yis attached to the lower end of the secondary mandrel 16 by means of a sub 52 which in turn is attached to the secondary mandrel by means of a coupling 53.` The seating sub 51 is attached to the sub 52 through a coupling 54.
A shearable seat 55 is provided. in the bore of the seating sub 51, said seat being arranged to receive aV valve ball 55a which is dropped into the secondary tubing and allowed to gravitate to a position of rest on the expellable seat 55 in order to permit the application of hydraulic pressure to the piston in the packer for setting, in themanner hereinafter described.
'I'he expellable seat 55 is frangibly secured within the seating sub 51 by means of a shear ring 56, which has a reduced thickness on theV outer edge thereof clamped between the inner end of the shear ring retainer 57 and a downwardly facing shoulder Within the seating sub 51.
A section of tubing is attached to the primary mandrel 15 by means of a sub 59 and a coupling 60. The tubing 58 would extend below the packer assembly herein described, and would be connected to another packer at a lower level in the well.
After the packer assembly has been lowered into the well to the desired position where ,it is to be set, the secondary string of tubing 61 may be run into the well and latched into the secondary passage provided through the anchor body 5 by means of a seal stinger 62, which for convenience, is shown as having a detachable connection, consisting of a J-slot 63 which engages a pin 64 in the secondary passage 3. Other types of disengageable latch- .in Stingers may be employed than the one shown, which is merely illustrative of a suitable form.
The operation and function of the hydraulic packer device hereinbefore described is as follows:
The packer is assembled and lowered into the well on the primary tubing string 4. Usually there is a single bore packer already set in the well below the dual bore packer, and the tubing string 58, extending therebelow, is guided into, and latched in, the upperend ofthe ,bore of such packer. The :secondary string 61 is then made up and run into the well and the stinger 62 thereof is guided into the secondary bore 5b of the anchor body 5 through thetapered surface 1a of the entry scoop 1, where it is latched in place by means of the J-slot arrangement shown, or otherwise. l i Y The valve ball 55a is then released into the secondary tubing string 61 and allowed to gravitate downwardly to come to rest upon therexpellable seat member 55. Hydraulic pressure is then increased in the secondary string to move the piston slips 6 outwardly by pressure released 6 therebehind through the passages 7 and 7a. Thus the packer assembly is anchored to the casing by means of the hydraulic slips 6.
Increased hydraulic pressure through the secondary tubing string 61, and through port 12a through the wall of mandrel 16, breaks the cylinder shear pins 14, releasing the cylinder 12. The cylinder 12 then moves downwardly, which shears the shear pins 31 holding the cinch slips 26 to the slip rests 28, which allows relative slidable movement therebetween along the tapered surfaces. The slip follower pins 23b maintain the cinch slips 26 downwardly and outwardly in engagement with the wa-ll of the casing. A continued downward movement of the cylinder 12 moves the mandrel slip retainer 18, mandrel slip housing 19, spring carrier 23, and slip glide 25 downwardly, applying force against the packer rubbers 37. The packer rubbers 37 move downwardly about the mandrels 15 and 16, and thereby move the expander head 40 downwardly to expand the slip bodies 41 outwardly into anchoring engagement with the casing.
Further downward movement of cylinder 12 compresses and expands the packer rubbers 37 into sealing engagement with the wall of the casing, and anchors the slips 41 into biting engagement with the wall of the casing.
It will be noticed during this operation that the casing is used as a tension member in setting the rubber in compression. The lower slips 41 support the rubber and the reaction from the piston 8 and cylinder 12 is carried through the hydraulic anchors 6 into the casing.
The mandrel slips 20 are urged into engagement with the mandrels 15 and 16 while the packer is being set, and the upwardly directed teeth thereon bite into the walls of thevmandrels after the packer is set and resists any tendency of the packer sleeves to relax in an upward direction since they are locked by the slip bodies 20 against upward movement. Thereby the mandrel slips 20 maintain the slip pick-up 27 in set position and prevent the slips 26 from becoming unset. Any additional weight imposed upon the tubing strings will be transmitted to the rubbers 37 tln'ough the slips 20 and 26, and any additional compression of the rubber byV such added weight will be locked into the rubber by the slips 26.
The slips 20 are inside the packer in protected position so that debris and Well mud do not effect their operation.
To retrieve the packer from the well, it is not required to rotate same to release the packer. It is necessary only to exert an upstrain on the primary tubing string 4 after the secondary string 61 has been disengaged from the packer.
It will thus be noted that the cylinder 12 and piston 8 do not have to be telescoped into running-in position in order to retrieve the packer. Neither do the mandrel slips 20 need to be released in order to pull the packer. The secondary string 61 may actually be left in place while the packer is being released. However, it is advisable to release the secondary string from the packer before retrieving in order to provide a fluid by-pass through the secondary mandrel 16 while retrieving.
Continued upstrain on the primary tubing string will shear the shear pins 48 holding the primary mandrel 15 down. As the anchor body 5, piston 8, and mandrels 15 and 16 move up, the shoulder 34 on the primary mandrel engages the shoulder 35 in the slip pick-up 27, and lifts the slip pick-up upwardly, allowing the slip retainers 28 to move inwardly by reason of the separation of the conical shoulders thereon and on the slip pick-up, thereby allowing the slips 26 to retract and move inwardly. As the slip pick-up 27 moves upwardly, the shoulders 36 thereon engage shoulders 36a in the spring housing 23 and pick it up, thereby allowing the cinch slip 26 and assembly to be pulled out of the well in relaxe'd Condition. The cinch slip assembly is retrieved from the well in relaxed position suspended on the shoulder 34 on the primary mandrel.
' The shoulder 50 on the secondary mandrel engages the shoulder 49 and picks up the expander head 40, thereby releasing the slips 41 from the casing and the packer may thus be retrieved from the well in fully relaxed condition.
lt will be noted that the same relative motion between piston 8 and cylinder 12 is present in setting and releasing the packer so that the :parts do not have to be retelescoped to release and retrieve the packer.
It will, therefore, be seen that I have provided a dual bore hydraulic packer in which the casing is used as a tension member, no rotation is required to set or unset same, thetubing does not have to be moved or stretched in order to set the packer, it is set by positive hydraulic action, slip means are provided inside the packer for compensating and locking in additional force ,and compression applied to the packer rubbers,y positive means is provided for unlatching the packer for retrieval from the well, and the piston and cylinder do not have toV be retelescoped for retrieval.
It will be understood that other and further embodiments of my invention may be made without departing from the spirit and scope of the appended claims.
Having described my invention, I claim: Y
1. In a packer device, a body having parallel lon gitudinal passages therethrough; hydraulically actuated slips mounted in the wall of the body arranged to be moved outwardly thereof into engagement with a surrounding well casing; means for supplying hydraulic pressure from one of the passages to the inner ends of the hydraulically actuated slips; a pair of tubular mandrels attached in the passages through the body and suspended therebelow; a hydraulic cylinder slidably and sea-linglyV disposed about the mandrels and sealingly and slidably engaging the outer wall of the body and arranged to move downwardly in response kto hydraulic pressure; means for supplying hydraulic pressure from one of said passages to the hydraulic cylinder to move same downwardly; atleast one packer sleeve disposed about the mandrels and slidably disposedthereon; slipmeansar- Y ranged about the mandrels between the cylinder and the packer sleeve; said slipmeans having upwardly directed teeth on the inner sides thereof engageable with ythe outer walls of the mandrels; guide means between the cylinder and slip means; co-acting conical surfaces on the slip means and the guide means to move the slips inwardly; anchor slips below the packer sleeve; ank
expander head arranged about the mandrels tok urge the anchor slips outwardly against the Wall of a surrounding Well casing; frangible means securing the anchor slips to one of the mandrels; and shoulder means on one of the mandrels engageable with shoulder means in the expanderY head to lift` same upwardly when the frangible means is broken.
2. The combination called for in claim 1 with the addition of additional slip means between the cylinder and the packer sleeve, said slip means having outer, upwardly directed teeth arranged to engage the wall of a surrounding well casing; expander means within the said slip means arranged to urge the slip means outwardly; and shoulder means on the other mandrel arranged to engage the expander means for the said slips to lift the expander means upwardly. t i
3. The combination called for in Vclaim 2 'with the addition of guide means slidably attached to the expander means for additional slip means arranged to allow lateral but not vertical movement of the `expander means for said additional slip means. l
4.Y The combination called for in claim 2 wherein the Vadditional slip means are frangibly `connected tothe ex- `at least one of the mandrels; and means to urge ment thereof.
is stationary and the other of which is movable down-l wardly `against the upper end of the packer sleeve to compress rs'ameymeans to apply hydraulic pressure from one of the passages between 'the telescoping members; hydraulically actuated s-lip pistons mounted in the 4wall of the body and movable outwardly thereof; and means Y to apply hydraulic pressure from one of the passagesk to the inner ends of the hydraulically actuated slip pistons.
` 6. The combination called for in claim 5 wherein the connection between the support and the mandrel isfrangi: Y
ble, and shoulder means is yprovided on the mandrel ent gageable withV shoulder 4means; in the expander means when the mandrel is moved upwardly.
7. Thecombination called forin claim 5 with the ad,- dition of mandrel engaging means above the packer sleeve having infwardlykdirected teeth thereonrengageable with the teeth into engagement with the mandrel. Y
8. The combination called for in claim 5 with'the addition of a plurality of casing slips above, the packer sleeve having upwardly directed teeth on the outer sides'.
thereof movable outwardly; and expander meansmovable downwardly by the downwardly moving telescoping member to expand thecasing slips outwardly: Y
9. The combination called for in claim 8 wherein the expander means for the casing slips is Yslidably mounted on guide members to permit lateral but not vertical move- 10. The combination calledY for infclaim 5 withithe addition of a valve cage connected to the lower: end fof one of the mandrels; and a shearable in the bore of the cage.
11. The combination called for in claim 5 wherein one il of the -telescoping'members is a piston secured tothe mandrels and the' other is a'cylinder slidably'and sealingly disposed about the mandrels and about therbody arranged to move downwardly against thepackerisleeve.
12. In awel-l packer; Va body vhaving a'pairfof "longitudinal passages therethrough; hydraulically actuated piston slips mounted in the wall of the body Vand movable outward-ly thereof; primary and secondary mandrelsV suspended in said passages, aV hydraulically actuated cylinder slidably and sealingly embracing the body, and slidr ably and sealingly embracing the mandrels; a basermember frangibly secured tothe secondary mandrel; a .plu
rality of anchorrslps attached to the base and beingV movable outwardly thereof; an expander Vhead slidably disposed about the mandrels; slidable contacting conical surfaces on Ithe head and fwithin the anchor slips;
Vat least one resilient packer sleeve slidably disposed about Y the mandrels above the expander head; a plurality oft.
mandrel slips ysurrounding the mandrels below the cylin der and above the packer sleeve, said mandrel slips having teeth on the inner sides thereof arranged tocon-l tact the mandrels;l means to urgey the teeth into' contact with the Vmandrels;a plurality ofcinch slips surroundf ingV the mandrelsvabove the packer sleeve, having teeth on the outerYY sides thereof; a spring housing about the mandrels .abovev the cinchV slips; a .plurality of spring urged pins movably extending below the spring houst-` ing,V one of which Vcontacts each cinch slip to urge same downwardly; a pick-up head disposed between theman-y drels within the spring housing; a plurality of slipex-k panderbodies disposed between the cinch slips and the pick-up head; co-acting `slidably related tapered surfaces on the cinch slips and on the expander bodies arrangedv to urge the said slips outwardly; frangible means initiallyl valve seat attached e 9 connecting the cinch slips and the expander bodies; and contacting inwardly directed tapered surfaces on the inner sides of the slip expander bodies and on the outer sides of the lower end of the pick-up head.
13. The combination called for in claim 12 with the addition of guide means arranged to permit lateral but not vertical movement of the expander bodies relative to the pick-up head.
14. The combination called for in claim 12 with theV addition of shoulder means on the primary mandrel; shoulder means on the pick-up head engageable with the shoulder means on the primary mandrel; shoulder means in the spring housing; additional shoulder means on the pick-up head arranged to engage the shoulder means in the spring housing; shoulder means in the expander head; and shoulder means on the secondary mandrel engageable with the shoulder means in the expander head.
15. The combination called for in claim 12 with the addition of frangible means initially connecting the cylinder to the body.
16. In a well packer, a tubular body having a plurality of longitudinal passages therethrough; a plurality of tubular mandrels attached in, and extending below, the passages; at least one packer sleeve surrounding the mandrels; a support secured to one of the mandrels be- 25 low the packer sleeve; slips secured to the support below the sleeve; expander means surrounding the mandrels below the sleeve arranged to move the slips outwardly; hydraulically actuated telescoping members, one of which is stationary and the other of which is movable downwardly against the upper end of the packer sleeve to compress same; means to admit hydraulic pressure from one of said passages between the hydraulically actuated telescoping members; hydraulically actuated slip pistons mounted in the wall of the body and movable outwardly thereof and means to admit hydraulic pressure from one of said passages to the inner ends of said hydraulically actuated slip pistons.
References Cited by the Examiner UNITED STATES PATENTS 2,903,066 9/ 1959 Brown 166-120 3,098,524 7/1963 Brown 166-120 X 3,112,796 12/1963 Myers 166-120 3,166,127 1/1965 Brown et al. 166-120 3,167,127 1/1965 sizer 16e-12o FOREIGN PATENTS 709,306 5/ 1954 Great Britain.
CHARLES E. OCONNELL, Primary Examiner.
C. D. I OHNSON, I. A. LEPPINK,