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US3731740A - Floating piston for selective hydraulic packer - Google Patents

Floating piston for selective hydraulic packer Download PDF

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US3731740A
US3731740A US3731740DA US3731740A US 3731740 A US3731740 A US 3731740A US 3731740D A US3731740D A US 3731740DA US 3731740 A US3731740 A US 3731740A
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Prior art keywords
packer
chamber
means
fluid
slip
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B Douglas
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Dresser Industries Inc
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Dresser Industries Inc
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    • EFIXED CONSTRUCTIONS
    • E21EARTH DRILLING; MINING
    • E21BEARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B33/00Sealing or packing boreholes or wells
    • E21B33/10Sealing or packing boreholes or wells in the borehole
    • E21B33/12Packers; Plugs
    • E21B33/129Packers; Plugs with mechanical slips for hooking into the casing
    • EFIXED CONSTRUCTIONS
    • E21EARTH DRILLING; MINING
    • E21BEARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B33/00Sealing or packing boreholes or wells
    • E21B33/10Sealing or packing boreholes or wells in the borehole
    • E21B33/12Packers; Plugs
    • E21B33/129Packers; Plugs with mechanical slips for hooking into the casing
    • E21B33/1294Packers; Plugs with mechanical slips for hooking into the casing characterised by a valve, e.g. a by-pass valve
    • EFIXED CONSTRUCTIONS
    • E21EARTH DRILLING; MINING
    • E21BEARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B33/00Sealing or packing boreholes or wells
    • E21B33/10Sealing or packing boreholes or wells in the borehole
    • E21B33/12Packers; Plugs
    • E21B33/129Packers; Plugs with mechanical slips for hooking into the casing
    • E21B33/1295Packers; Plugs with mechanical slips for hooking into the casing actuated by fluid pressure

Abstract

A well packer of the type which is set by hydraulic pressure injected through the tubing string, having a setting chamber between the pistons therein which actuate the packer, wherein one of the pistons is floating while the packer is being lowered to compensate for thermal expansion or contraction and pressure differentials encountered as the packer is lowered in the well in order to prevent undue pressure from being applied to the pistons which could cause the shearing of shear pins holding the packer in unset position which would prematurely set the packer.

Description

May 8, 1973 United States Patent 1191 Douglas FLOATING PISTON FOR SELECTIVE HYDRAULIC PACKER Primary Examiner-James A. Leppink Attorney-Robert W. Mayer, Thomas P. Hubbard, Jr., Daniel Rubin, Raymond T. Majesko, William E. John- [75] Inventor: Bobby L. Douglas, Dallas, Tex.

[73] Assignee: Dresser Industries, Inc., Dallas, Tex. son, Jr., Morgan L. Crow, Eddie E. Scott and Howard M Filed: May 24, 1971 Om Appl. No.: 146,027

ABSTRACT A well packer of the type which is set by hydraulic 521 US. p s injected thmugh the tubing String, having a 51 int. c1. 23/04 chamber Pistons "3 Which tuate the packer, wherein one of the pistons 18 floating [58] Field ofSearch......................166/120,121,122,

166/212 while the packer is being lowered to compensate for thermal expansion or contraction and pressure differentials encountered as the packer is lowered in the [5 6] References Cited well in order to prevent undue pressure from being ap- UNITED STATES PATENTS plied to the pistons which could cause the shearing of shear pins holding the packer in unset position which would prematurely set the packer.

3,122,205 2/1964 Brown et al. .........................166/l20 3,361,207 1/1968 3,460,616 8/1969 Chenoweth ..........................166/120 Tucker et al. ........................166/120 12 Claims, 10 Drawing Figures 4 Sheets-Sheet l w a mm ID a 5 a 0 a Z a 6 5 U m ur ww a xx 2 mm 3 A r A w 0 4 7 a 5 m m r T.

ATTOP/VEY Patented Ma 8, 1913 Patented May 8, 1973 4 Sheets-Sheet 2 fig. E

INVENTOP 50/55) L DOUGLAS M 7mm ATTO Q/VE) Patented May 8, 1973 4 Sheets-Sheet 5 ATTOPNE) Patented May 8, 1973 3,731,740

4 Sheets-Sheet 4.

//v van/rap 50515) L. DOUGLAS ATTORNEY FLOATING PISTON FOR SELECTIVE HYDRAULIC PACKER BACKGROUND OF INVENTION The improvement comprehended by this invention is applicable to a hydraulic packer of the type disclosed in United States Letters Patent No. 3,460,616, entitled Retrievable Packer with which is employed slips or gripping members like that disclosed in United States Letters Patent No. 3,548,936 entitled Well Tools and cient extent to break shear pins which maintain the packer in unset condition, thereby causing premature setting of the packer.

The improvement comprehended by this invention is intended to overcome such problem.

SUMMARY OF THE INVENTION Although hydraulic packers of the type to which this improvement is addressed could be adapted for use in multistring installations, it is particularly useful in wells having more than one producing zone wherein the operator might desire to produce and deplete one zone at a time. In such an installation the operator could use one string of tubing with the packer between each zone and with a valve capable of being open to communicate with the producing zone below each packer. Thus, the operator would have the capability to produce from any selected zone by opening the valve in the tubing string communicating with such zone below the packer set thereabove, leaving the other valves in the string closed.

In such selective zone completion the packers are lowered into the well as the tubing string is made up. When the complete tubing string or strings are positioned in the well bore the packer, as an example, may be successively set and tested for leaks after they are set. This is carried out by closing the lower end of the tubing string by a floating ball valve. A frangible plug closes communication between the tubing bore and a setting chamber between the pistons in the packer. A shifting sleeve in the tubing bore is arranged to shear the frangible plug when moved upwardly or downwardly as the case may be, to open the port therein and allow communication between the bore of the tubing string and the setting chamber to permit fluid pressure to be applied to the setting chamber and the setting piston therein to set the packer in the manner which will be hereinafter described.

After the packer is set the sleeve valve below the packer in the tubing string is opened and pressure may be applied to either the casing annulus or inside the tubing string to test the packer to determine whether or not it will hold pressure.

After setting and testing the lowermost packer in the tubing string the next lowest packer may likewise be set and tested with all valves in the tubing string between the packers closed except that immediately below the packer being set and tested. Selected packers in the string may likewise be set and tested.

Prior to running the packer in the well the isolated setting chamber between the pistons in the packer is filled with fluid through ports provided through the wall of the chamber and the ports are then closed. Thereby the setting chamber between the pistons is filled with fluid which is isolated from the fluid exter nally thereof and fluid in the tubing string by reason of the shearable plug in the shifting sleeve and the seals on the pistons. At least one of the pistons is movable longitudinally of the chamber to sufficient extent to compensate for expansion or contraction of the fluid in the setting chamber by reason of temperature changes outside same or by reason of equalization of pressure differential between fluids outside and inside the chamber, so that such expansion or pressure change will not be transferred through the setting sleeve to the shearable elements in the packer to cause premature setting of the packer.

It is therefore, a primary object of the invention to provide means in a hydraulic packer to compensate for temperature and/or pressure changes encountered upon lowering the packer in the well to prevent premature setting of the packer.

Another object of the invention is to provide a setting chamber between the pistons in a hydraulic packer which is isolated from fluids inside and outside the chamber, which chamber is filled with fluid and wherein at least one of the pistons is movable to compensate for expansion or contraction of the fluid therein by reason of temperature changes and to compensate for changes in pressure differential between the fluid in the chamber and fluid outside the chamber to thereby prevent such forces from being transferred to shearable members in the packer to cause premature setting of the packer.

A further object of the invention is to provide in a hydraulic packer an isolated setting chamber between the pistons therein which is filled with fluid and communication between the chamber and the tubing string may be established through a shearable plug actuated by a shifting sleeve from inside the tubing string.

Still another object of the invention is to provide a plurality of such hydraulic packers in a tubing string, each having an isolated setting chamber therein filled with fluid wherein each such chamber may be selectively placed in communication with the tubing string by means of a shifting sleeve which establishes communication between the tubing string and the setting chamber by a shearable plug which provides a positive seal and isolation of said chamber from the tubing string until the shearable plug is broken to establish communication between the bore of the tubing and the chamber.

A general object of the invention is to provide an improvement in a hydraulic packer which positively prevents premature setting of the packer while being lowered in the well by reason of pressure and temperature variations.

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.

DESCRIPTION OF DRAWINGS A suitable embodiment of the invention is shown in the attached drawings, wherein,

FIGS. 1,2, 3 and 6 is partially sectionalized elevational view of a hydraulic packer in unset condition incorporating the improvements disclosed and claimed herein;

FIG. 4 is a transverse sectional view taken on the line 4-4 of FIG. 3.

FIG. is an enlarged vertical sectional view of the shear plug through which communication is established between the bore of the tubing string and the setting chamber when it is sheared; and

FIGS. 7-10, inclusive, is a partially sectionalized elevational view of the packer in set position.

DESCRIPTION OF A PREFERRED EMBODIMENT Numeral references are employed to indicate the various parts shown in the drawings and like numerals indicate like parts throughout the various figures of the I drawings.

The number 1 indicates a top connection for the packer which is adapted to be threadedly engaged to a tubing string extending into the well casing.

The upper slip control housing 2 is threadedly engaged to the packer connection 1, and has positioned therein a spacer ring 3 which is positioned between the slip carrier 7 and the end of the top connection 1.

The split retainer ring 4 is interlocked with a groove extending about the upper end of the slip carrier 7, and provides an upper abutment for the slip control spring 5, which is the subject of the co-pending application of Andrew J. Tucker entitled Resilient Slip Suspension Means in Hydraulic Packer, Ser. No. 146,056 filed concurrently herewith.

The cap 6 which acts as a retrieving head when the packer is disengaged, is threadedly engaged to the lower end of the slip control housing 2 and the slip carrier 7 slidably extends therethrough.

The tubular slip carrier 7 provides a support for the upper slip 8. The slip carrier 7 has spaced shoulders 7a and 7b thereon providing a recessed area therebetween about which the slip 8 is suspended to prevent an internal bind on the slip when it is in set position.

A flat spring 9 is secured to the body of slip 8 by means of a suitable cap screw 10. The inner end of the spring 9 is biased against the slip carrier 7 and the slip 8 is suspended on the lug 8e provided on the slip carrier 7 in contact with shoulder 8f on the slip body to maintain the slip in vertical position. The slip 8 is of the type disclosed in U. S. Pat. No. 3,548,936 which may be tilted with reference to the slip carrier 7 when force is exerted against the end thereof as disclosed in said patent.

The slip 8 has teeth 80 and 81) on the outer surface at opposite ends thereof for movement into anchoring engagement with the well casing. An elongated slot 8c is provided in the wall of the slip carrier 7 through which extends a slip suspension pin 8d which is secured to the slip body so that upon the tilting and setting of the slip same can pivot about the pin 8d and move upwardly in the slot 80 to compensate for vertical movement thereof.

The upper mandrel 11 is threadedly engaged to the top connection 1 and extends through the upper portion of the packer and provides a flow passage therethrough.

The upper head of the packer assembly includes a cap 12 threadedly engaged to the upper end of the balance valve chamber 19. An annular space 12a is provided between the cap 12 and mandrel 11 for fluid communication with the upper end of the balanced piston 13. The balance piston 13 is slidably disposed in the balance chamber 19 and has seals 14 and 15 on the inner and outer sides thereof which seal between same and the outer surface of the mandrel 11 and the inner surface of the balance chamber 19. Fluid communication ports are provided through the wall of the balanced chamber 19 and communicate with the area therein below the balance valve 18 and with the ports 27a to equalize pressure across the packer seals when the valve is open. The balance valve 18 has a seal 18a thereabout which seals against the inner wall of the balance chamber 19. The balance valve 18 is suspended to the mandrel 11 by means of a keeper ring 17 which is secured thereto by means of a retainer ring 16 and is positioned in a slot extending about the mandrel 11.

The balance valve subseal assembly 20 includes an outer shell which rests upon a shoulder 22a provided interiorally of the seal housing 22 and a seal 20b is provided between same and the inner surface of the seal housing 22. An elongated seal 20a is provided on the inner surface of the seal housing 20 which is spaced from the outer surface of the mandrel 11 so that it can receive the lower end of the balance valve 18 to isolate the area in the casing above and below the packer sleeves 25a and 25b when expanded.

The seal housing 22 is attached at its upper end to the balance valve chamber 19 and at its lower end to the upper packer rubber support thimble 24. The seal housing 22 is threadedly attached to the upper end of the packer body 25 and a .seal 23 is provided therebetween.

The resilient packer seals 25a and 25b are slidably disposed about the packer body 25 between the upper thimble 24 and the lower thimble 24a and are spaced apart by a spacer member 26. The lower thimble 24a is attached to a spacer collar 27 and is suspended to a shoulder 250 on the lower end of the packer body 25 so that it is slidably disposed with relation to the packer body. Ports 270 are provided through the wall of the spacer collar 27 to provide communication between the areas above and below the packer seals 25a and 25b when valve 19 is open to provide equalization of pressurethereacross before retrieval.

A floating piston 28 is movable in the setting cylinder 38 and has seals 29 and 29a on the outer and inner sidesthereof, respectively, which seal between the inner surface of the setting cylinder 38 and the outer surface of the mandrel l I. A shoulder 29b on the piston 28 is spaced from shoulder 29c at the lower end of the spacer collar 27 so as to permit limited upward movement of the piston 28 in response to fluid expansion or pressure increase of fluid in the setting chamber, which will be hereinafter described.

A threaded hole 29d is provided on the exterior surface of the piston 28 which is accessible through a passage 292 through the wall of the setting cylinder 38 through which a screw may be inserted for temporary retention of the setting cylinder 28 in fixed position while the setting chamber 38 is being filled with fluid as hereinafter described.

Removable pressure plugs and 300 are provided in threaded passages through the wall of the setting cylinder 38 so that upon removal of the plugs 30 and 30a suitable fluid supply circulating connections (not shown) may be attached in said passages through which fluid may be injected for filling the setting chamber A with a suitable fluid. The fluid may be either an incompressible liquid such as a relatively light oil or a gas such as freon or nitrogen.

A mandrel sub 31 is threadedly engaged to the lower end of the upper mandrel 11 and is threadedly engaged at its lower end to the shifting sleeve housing 37. A seal 33 is provided between the mandrel sub 31 and the upper end of the shifting sleeve housing 37.

A shifting sleeve 32 is slidably disposed within the housing 37 and is retained in place therein by means of a shear plug 34 which is threadedly engaged in the wall of the shifting sleeve housing 37 and has an outer end thereon which extends into a channel 32a formed about the upper end of the shifting sleeve 32. The shear plug 34 has a central passage 34a therein which communicates with the chamber A and is closed at its outer end by the shearable extension of the shear plug 34. Ports 32c are provided through the wall of the shifting sleeve 32 which may be brought into alignment with ports 340 through shear plug 34 upon the shearing of the shear plug in the manner hereinafter described. An annular shoulder 32b is provided interiorally of the shifting sleeve 32 for engagement with a shifting tool lowered from the surface for upward movement of the shifting sleeve 32 to break the shear plug 34 to thereby move the ports 32c into position with the passages 34a such that fluid communication is established between the bore of the mandrel 11 and the chamber A. A suitable seal 35 (FIG. 5) is provided between the shear plug 34 and a shoulder in the passage through which it extends to prevent fluid leakage thereabout.

Segmented cylinder locks 36 are suspended about the shifting sleeve housing 37 and are arranged to move inwardly by reason of a shoulder 36a thereon which extends into a recess 37a provided about the housing 37. The lower end of the cylinder lock 36 has an enlarged portion thereon which extends into a recess 38a provided in the setting cylinder 38 and is retained in outward position in said recess by the extension 390 on the upper end of the setting sleeve 39, but is permitted to move inwardly out of the recess 38a when the sleeve 39 moves downward to disengage the extension 390 therefrom to thereby permit relative movement between setting sleeve 39 and the setting cylinder 38 upon the setting of the packer.

The setting sleeve 39 comprises a piston which is slidably and sealingly engaged with the inner wall of the setting cylinder 38 and the outer wall of the lower mandrel 47 by seal members 39a and 39b.

The cylinder slip housing 40 extends about the setting sleeve 39 and is threadedly engaged to the setting cylinder 38. The segmented cylinder slips 41 have teeth 41a on the inner side thereof which are urged into engagement with the outer surface of the setting sleeve 39 by means of slip springs 42 which extend into bores 41b provided in the lower end of the slips 41a and are attached to slip guides 43 mounted upon the upper end of the shear housing 45.

The shear pins 44 frangibly attach the shear housing 45 to the setting sleeve 39.

The cap 46, threadedly engaged to the lower end of the setting sleeve 39 provides a lower head for the packer assembly which is engageable with the upper end of the lower slip 49 to set same upon the setting of the packer.

The lower mandrel 47 is threadedly engaged to the shifting sleeve housing 37 and to the bottom connection 55. The slip 49 is pivotally mounted on the lead-in sleeve 48, said lead-in sleeve 48 having a recessed surface 48a against which the spring 49c is engaged to bias the slip 49 to vertical position and maintain same out of engagement with the casing until actuated in the manner hereinafter described. The slip 49 is of the same type as upper slip 8 and functions in similar manner. It has upper and lower outer teeth 49a and 49b thereon arranged to engage the casing wall to anchor same thereagainst.

The slip 49 is pivotally mounted on a pin 49e which extends through an elongated passage 49f and is engaged with the sleeve 48 which permits the slip to pivot about said pin to set position, as shown in FIG. 10, when pressure is exerted against the upper end thereof by the lower head 46.

The sleeve 48 on which the slip 49 is mounted extends into the slip control housing 50, is secured thereto by the shearable set screws 50a and is spaced from the lower end thereof by a resilient take-up ring 50b. The slip control housing 50 is threadedly engaged to the mandrel shear housing 51 which in turn is frangibly connected to bottom connection 55 by the shear pins 52.

Segmented mandrel slips 53 have teeth on the inner sides thereof engageable with the outer surface of the bottom connection 55 and are seated in the mandrel housing 54 which in turn is suspended to the lower end of the shear housing 51 and is arranged to come into engagement with the teeth 55a on the bottom connection 55 when the shear pin 52 is sheared for retrievai of the packer.

A stop ring 5 is arranged to engage the lower end of the mandrel slip housing 54 upon shearing of the shear pin 52 and the movement of the mandrel upwardly therein in order to retrieve the slip control housing 50 with the packer.

OPERATION AND FUNCTION The packer is assembled in unset condition as shown in FIGS. 1-6 inclusive. Prior to attaching same to the tubing string and running it into the well, an incom pressible fluid or gas is injected through the ports 30-30aby a suitable fluid dispensing device to fill the chamber A with such fluid. While it is being filled a screw is inserted in the threaded hold 29d through the passage 29c to retain the piston 28 in the position shown in FIG. 3. After filling the chamber A the passages 30 and 30a are closed by suitable plugs to retain the fluid therein, and the screw is removed from the threaded hole 29d.

The packer is then attached in the tubing string and lowered into the well to the desired level for setting. While it is being lowered any changes in temperature or pressure differential between the chamber A and exteriorally of the tool above or below the pistons 28 and 39 is compensated for by expansion or contraction of the fluid in the chamber A. Such is permitted by floating piston 28 which may float between shoulder 29b and 29c.

When the packer has reached the desired level for setting the bore of the tubing is closed below the packer by a conventional ball valve and a conventional setting tool (not shown). is run into the tubing and the dogs thereon engage with the shoulder 32b on the shifting sleeve 32. Upward pull on the setting tool 32 shears the end off of the frangible plug 34 and upon further upward movement the ports 32c come into position with the passages 34a such that fluid communication is established between the bore of the tubing string and the chamber A. Upon exertion of fluid pressure from the tubing through passage 34a into chamber A downward force is exerted on the piston 39 and an upward force on the setting'cylinder 38 thereby shearing the shear pin 44, allowing the setting cylinder 38 to move upwardly to compress and expand the packing rubbers 25a and 25b. Such movement causes the upper head 12 to come into contact with the lower end of upper slip 8 and move same to set position against the casing wall to anchor same and stop further upward movement of upper head 12 and expands packer rubbers 25a and 25b. The downward movement of the piston 39 causes the lower head 46 to come into contact with the upper end of the slip 49 and move same into set position. The slip teeth 41a engage the piston 39 and retain it in down position. The downward movement of piston 39 disengages the locking members 36 from the cylinder 38 to permit upward movement of setting cylinder 38 as the packer is set.

To disengage the packer an upward pull is exerted on the tubing string to shear the lower shear pin 52 and allow the slip control housing 50 to move upwardly to disengage the lower slip 49 and permit the packet to relax to running in position so that it can be retrieved from the well.

Having described my invention, 1 claim:

1. In a fluid pressure actuated retrievable packer assembly, the combination of:

A tubular support for the packer assembly; a packer body surrounding the support; at least one resilient packer sleeve slidably mounted on the packer body; a tubular cylinder surrounding the support below the packer sleeve; a tubular member surrounding the support above the packer sleeve;

upper and lower pistons positioned in the spacev between the cylinder and the support, and being in sealing engagement with the cylinder and the support providing a chamber between said pistons; eloseable port means through the wall of the cylinder through which the chamber may be filled with fluid; a passage through the wall of the support arranged to communicate with the chamber; frangible means closing said passage; and movable means positioned inside the tubular support, engaged with the frangible means; said movable means being engageable with a tool lowered from the surface to break the frangible means to provide communication between the chamber and the interior of the tubular support.

2. The combination called for in claim 1 wherein the lower piston is connected to the cylinder by a shearable member whereby when said shearable member is broken by pressure exerted in the chamber against the piston the cylinder moves upwardly in relation to the piston to move the resilient packer sleeve and the upper tubular member upwardly, and the lower piston moves downwardly; and upper and lower slip means surrounding the support above and below the packer assembly, the upper slip being engageable with upper tubular member and the lower slip being engageable with the lower piston to anchor the slips and expand the packer sleeve against a surrounding well casing.

3. The combination called for in claim 1 wherein the upper piston is movable longitudinally of the chamber in response to variations of temperature and pressure exerted on fluid within the chamber.

4. The combination called for in claim 1 wherein the upper tubular member is a balance valve housing having a balance valve therein arranged to be opened and closed by movement of the upper tubular member.

5. The combination called for in claim 1 wherein the means to break the frangible means is a sleeve slidably disposed in the tubular support engaged with the frangible means said sleeve having a shoulder therein engageable with a tool extending from the surface, and having a port through the wall thereof arranged to be aligned with the passage upon breaking the frangible means and movement of said sleeve upwardly.

6. In a fluid pressure actuated retrievable packer assembly of the type suspended to a tubing string and having pistons therein which when subjected to pressure from interiorally of the tubing causes a packer sleeve support cylinder thereabout to move with relation to the pistons to expand the packer, the improvement comprising, a chamber between the pistons filled with a fluid, one of said pistons floating and being free to move longitudinally of the chamber in response toexpansion or contraction of the fluid.

7. The combination called for in claim 6 with the addition of closeable port means through the wall of the chamber to permit the filling of said chamber with fluid.

8. The combination called for in claim 6 with the addition of passage means adapted to establish communication between the chamber and the interior of the tubing; frangible means closing said passage means; and means to break the frangible passage means from interiorally of the tubing to establish communication between the tubing and the chamber.

9. The combination called for in claim 8 with the addition of shearable means connecting the cylinder to the other said piston whereby upon breaking the frangible means pressure may be injected into the chamber from the tubing through the passage means to break the shearable means and disengage the cylinder fromthe piston to allow relative movement therebetween. 10. The combination called for in claim 9 with the addition of anchor means on the tubing above and below the packer assembly expandable by engagement with ends of the packer assembly upon relative movement between the cylinder and piston.

11. The combination called for in claim 7 with the the addition of means to disengageably attach the movable piston to the cylinder while the chamber is being filled with fluid.

12. in a fluid pressure actuated packer assembly having a piston therein which when subjected to pressure from interiorally of the tubing causes a packer sleeve support cylinder thereabout to move with relation to the piston to expand the packer, the improvement comprising, a chamber adjacent the piston filled with a fluid, said piston floating and being free to move longitudinally of the chamber in response to expansion or contraction of the fluid.

Claims (12)

1. In a fluid pressure actuated retrievable packer assembly, the combination of: A tubular support for the packer assembly; a packer body surrounding the support; at least one resilient packer sleeve slidably mounted on the packer body; a tubular cylinder surrounding the support below the packer sleeve; a tubular member surrounding the support above the packer sleeve; upper and lower pistons positioned in the space between the cylinder and the support, and being in sealing engagement with the cylinder and the support providing a chamber between said pistons; closeable port means through the wall of the cylinder through which the chamber may be filled with fluid; a passage through the wall of the support arranged to communicate with the chamber; frangible means clOsing said passage; and movable means positioned inside the tubular support, engaged with the frangible means; said movable means being engageable with a tool lowered from the surface to break the frangible means to provide communication between the chamber and the interior of the tubular support.
2. The combination called for in claim 1 wherein the lower piston is connected to the cylinder by a shearable member whereby when said shearable member is broken by pressure exerted in the chamber against the piston the cylinder moves upwardly in relation to the piston to move the resilient packer sleeve and the upper tubular member upwardly, and the lower piston moves downwardly; and upper and lower slip means surrounding the support above and below the packer assembly, the upper slip being engageable with upper tubular member and the lower slip being engageable with the lower piston to anchor the slips and expand the packer sleeve against a surrounding well casing.
3. The combination called for in claim 1 wherein the upper piston is movable longitudinally of the chamber in response to variations of temperature and pressure exerted on fluid within the chamber.
4. The combination called for in claim 1 wherein the upper tubular member is a balance valve housing having a balance valve therein arranged to be opened and closed by movement of the upper tubular member.
5. The combination called for in claim 1 wherein the means to break the frangible means is a sleeve slidably disposed in the tubular support engaged with the frangible means said sleeve having a shoulder therein engageable with a tool extending from the surface, and having a port through the wall thereof arranged to be aligned with the passage upon breaking the frangible means and movement of said sleeve upwardly.
6. In a fluid pressure actuated retrievable packer assembly of the type suspended to a tubing string and having pistons therein which when subjected to pressure from interiorally of the tubing causes a packer sleeve support cylinder thereabout to move with relation to the pistons to expand the packer, the improvement comprising, a chamber between the pistons filled with a fluid, one of said pistons floating and being free to move longitudinally of the chamber in response to expansion or contraction of the fluid.
7. The combination called for in claim 6 with the addition of closeable port means through the wall of the chamber to permit the filling of said chamber with fluid.
8. The combination called for in claim 6 with the addition of passage means adapted to establish communication between the chamber and the interior of the tubing; frangible means closing said passage means; and means to break the frangible passage means from interiorally of the tubing to establish communication between the tubing and the chamber.
9. The combination called for in claim 8 with the addition of shearable means connecting the cylinder to the other said piston whereby upon breaking the frangible means pressure may be injected into the chamber from the tubing through the passage means to break the shearable means and disengage the cylinder from the piston to allow relative movement therebetween.
10. The combination called for in claim 9 with the addition of anchor means on the tubing above and below the packer assembly expandable by engagement with ends of the packer assembly upon relative movement between the cylinder and piston.
11. The combination called for in claim 7 with the the addition of means to disengageably attach the movable piston to the cylinder while the chamber is being filled with fluid.
12. In a fluid pressure actuated packer assembly having a piston therein which when subjected to pressure from interiorally of the tubing causes a packer sleeve support cylinder thereabout to move with relation to the piston to expand the packer, the improvement comprising, a chamber adjacent the piston filled with a fluid, said piston floating and being free to move longitudinally of the chamBer in response to expansion or contraction of the fluid.
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Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3804164A (en) * 1973-04-09 1974-04-16 Dresser Ind Well packer apparatus having improved hydraulically-actuated anchor assembly
US3851707A (en) * 1973-11-02 1974-12-03 Dresser Ind Uni-directional unitary anchor slip
US3858648A (en) * 1973-11-02 1975-01-07 Dresser Ind Dual string hydraulically actuated oil well packer
US3913675A (en) * 1974-10-21 1975-10-21 Dresser Ind Methods and apparatus for sand control in underground boreholes
US4008759A (en) * 1975-10-31 1977-02-22 Dresser Industries, Inc. Oil well tool with packing means
FR2422892A1 (en) * 1978-04-12 1979-11-09 Dresser Ind A sealing valve for well packer of derivation
US4214629A (en) * 1979-04-19 1980-07-29 Dresser Industries, Inc. Well packer bypass valve seal assembly
US4669538A (en) * 1986-01-16 1987-06-02 Halliburton Company Double-grip thermal expansion screen hanger and running tool
US20060289169A1 (en) * 2005-06-24 2006-12-28 Dwayn Anderson Method and apparatus for installing casing in a borehole
US20070012460A1 (en) * 2005-07-13 2007-01-18 Baker Hughes Incorporated Hydrostatic-set open hole packer with electric, hydraulic and/or optical feed throughs
US20070012453A1 (en) * 2005-07-13 2007-01-18 Baker Hughes Incorporated Optical sensor use in alternate path gravel packing with integral zonal isolation
US20090229832A1 (en) * 2008-03-11 2009-09-17 Baker Hughes Incorporated Pressure Compensator for Hydrostatically-Actuated Packers
WO2015001451A3 (en) * 2013-07-04 2015-11-12 BYWORTH, Ian Packer apparatuses
CN105804685A (en) * 2011-01-20 2016-07-27 保罗·伯纳德·李 Downhole tool

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3122205A (en) * 1960-11-14 1964-02-25 Brown Oil Tools Well packer assemblies
US3361207A (en) * 1964-09-04 1968-01-02 Baker Oil Tools Inc Retrievable subsurface well tools
US3460616A (en) * 1967-07-26 1969-08-12 Dresser Ind Retrievable packer

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3122205A (en) * 1960-11-14 1964-02-25 Brown Oil Tools Well packer assemblies
US3361207A (en) * 1964-09-04 1968-01-02 Baker Oil Tools Inc Retrievable subsurface well tools
US3460616A (en) * 1967-07-26 1969-08-12 Dresser Ind Retrievable packer

Cited By (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3804164A (en) * 1973-04-09 1974-04-16 Dresser Ind Well packer apparatus having improved hydraulically-actuated anchor assembly
US3851707A (en) * 1973-11-02 1974-12-03 Dresser Ind Uni-directional unitary anchor slip
US3858648A (en) * 1973-11-02 1975-01-07 Dresser Ind Dual string hydraulically actuated oil well packer
US3913675A (en) * 1974-10-21 1975-10-21 Dresser Ind Methods and apparatus for sand control in underground boreholes
US4008759A (en) * 1975-10-31 1977-02-22 Dresser Industries, Inc. Oil well tool with packing means
FR2422892A1 (en) * 1978-04-12 1979-11-09 Dresser Ind A sealing valve for well packer of derivation
US4188998A (en) * 1978-04-12 1980-02-19 Dresser Industries, Inc. Well packer bypass valve seal assembly
US4214629A (en) * 1979-04-19 1980-07-29 Dresser Industries, Inc. Well packer bypass valve seal assembly
US4669538A (en) * 1986-01-16 1987-06-02 Halliburton Company Double-grip thermal expansion screen hanger and running tool
US20060289169A1 (en) * 2005-06-24 2006-12-28 Dwayn Anderson Method and apparatus for installing casing in a borehole
US20070012460A1 (en) * 2005-07-13 2007-01-18 Baker Hughes Incorporated Hydrostatic-set open hole packer with electric, hydraulic and/or optical feed throughs
US20070012453A1 (en) * 2005-07-13 2007-01-18 Baker Hughes Incorporated Optical sensor use in alternate path gravel packing with integral zonal isolation
US7441605B2 (en) * 2005-07-13 2008-10-28 Baker Hughes Incorporated Optical sensor use in alternate path gravel packing with integral zonal isolation
US20090229832A1 (en) * 2008-03-11 2009-09-17 Baker Hughes Incorporated Pressure Compensator for Hydrostatically-Actuated Packers
CN105804685A (en) * 2011-01-20 2016-07-27 保罗·伯纳德·李 Downhole tool
WO2015001451A3 (en) * 2013-07-04 2015-11-12 BYWORTH, Ian Packer apparatuses

Also Published As

Publication number Publication date Type
CA949876A (en) 1974-06-25 grant
JPS5441961B1 (en) 1979-12-11 grant
CA949876A1 (en) grant
GB1368691A (en) 1974-10-02 application
DE2224953A1 (en) 1972-12-07 application

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