Axially compressed radially mechanically expanded rubber sleeve and packer and method of use

Abstract

The application discloses an axial compression radial mechanical expansion rubber sleeve and packer and a use method, and relates to the field of packers, which comprises a central pipe and a rubber sleeve, the rubber sleeve is arranged on the outer wall of the central pipe, the lower end of the rubber sleeve is fixedly connected with the central pipe, and the upper end of the rubber sleeve is slidably and sealingly connected with the central pipe through a push tube; the push tube is connected with a sliding ejection mechanism in the rubber sleeve, the sliding ejection mechanism is connected with the outer wall of the central pipe, and the sliding ejection mechanism is connected with the inner wall of the rubber sleeve. The rubber sleeve is slidably connected with the central pipe through the push tube, the rubber sleeve can be contracted to a flat state, the rubber sleeve has a large expansion distance, and when the rubber sleeve is expanded, the rubber sleeve under pressure can be expanded outward to release the dead point state of the sliding ejection mechanism, the rubber sleeve is easy to open, and the reliability is high.

Description

Technical Field

[0001] This invention relates to the field of packer technology, specifically to an axially compressed radially mechanically expanding rubber sleeve, packer, and method of use. Background Technology

[0002] Packers are elastic sealing elements used in oil production engineering to seal the annular space between the tubing string and the wellbore, and to isolate the producing layer. They are mainly divided into self-sealing, compression, and expansion types. Expansion packers are mainly used in oilfield stratified oil production, stratified water injection, stratified acidizing, and stratified fracturing. They are mainly composed of a central tube, a rubber sleeve seat, and a rubber sleeve. Pressurized hydraulic oil from the tubing enters the annular space between the central tube and the rubber sleeve, expanding the rubber sleeve and sealing the annular space between the tubing and casing.

[0003] While existing expandable packers are highly adaptable to wellbore conditions, have reliable setting, are easy to expand and contract, and require no mechanical movement, they have strict speed requirements during the running-in process. Excessive speed can easily lead to a sudden increase in fluid pressure inside the tubing, creating a pressure differential, which can cause the expandable packer to set midway, damage the rubber sleeve, and result in process failure.

[0004] Announcement No. CN116335580B discloses a sleeve packer with bidirectional compression sealing function, comprising a central tube, to which symmetrically distributed sleeves are fixed. The symmetrically distributed sleeves cooperate with the central tube to form symmetrically distributed annular grooves. An expansion rubber cylinder is disposed within the symmetrically distributed annular grooves, and the expansion rubber cylinder cooperates with the central tube to form an annular cavity. The central tube is provided with circumferentially spaced and symmetrically distributed liquid inlet holes, which communicate with the annular cavity. A push rod is slidably connected within the liquid inlet hole, and the push rod is hinged to equidistantly distributed connecting rods. The equidistantly distributed connecting rods are hinged to first compression plates, which cooperate with the expansion rubber cylinders. By compressing the push rods on both sides, multiple first compression plates expand outward simultaneously. This prior art has the potential for sudden increase in liquid pressure during insertion, leading to accidental sealing.

[0005] Announcement No. CN216714349U discloses a mechanical packer for groundwater remediation. After the packer is lowered to the expected depth, the ground personnel operate the release device to push the upper tooth column downward to start the setting. The upper tooth column pushes the lower tooth column, as well as the connected drive shaft, setting piston, push rod and expansion ring in the guide rail. The expansion ring causes the rubber sleeve to expand and press tightly against the inner wall of the casing.

[0006] Announcement No. CN207813561U discloses a packer for oilfield downhole tools. In use, rotating the screw handle can drive the external thread screw rod to rotate. When the external thread screw rod rotates, it drives the lifting block to move up and down. When the lifting block descends, it drives the arc-shaped expansion push plate to expand outward through the hinge plate, so that the outer end of the arc-shaped expansion push plate abuts against the inner wall of the packer rubber sleeve, thereby expanding the packer rubber sleeve and making the packer rubber sleeve tightly fit against the inner wall of the tubing, thus achieving the sealing treatment.

[0007] The expansion speed, expansion radius, and reliability of the expansion initiation of the rubber tube in the aforementioned prior art are all inferior to the technical solution provided by the present invention.

[0008] In summary, the technical solutions, technical problems to be solved, and beneficial effects of the above-disclosed technologies are all different from those of the present invention. Regarding the more technical features, technical problems to be solved, and beneficial effects of the present invention, the above-disclosed technical documents do not provide any technical inspiration. Summary of the Invention

[0009] In view of the above-mentioned defects in the existing technology, the purpose of the present invention is to provide an axially compressed radial mechanical expansion rubber sleeve and packer and a method of use.

[0010] To achieve the above objectives, the present invention adopts the following technical solution:

[0011] On one hand, the present invention provides an axially compressed radially mechanically expanding rubber sleeve, including a central tube and a rubber sleeve. The rubber sleeve is sleeved on the outer wall of the central tube, the lower end of the rubber sleeve is fixedly connected to the central tube, and the upper end of the rubber sleeve is slidably and sealingly connected to the central tube through a push tube. The push tube is connected to a sliding ejection mechanism inside the rubber sleeve. The sliding ejection mechanism is connected to the outer wall of the central tube and the inner wall of the rubber sleeve.

[0012] Furthermore, multiple sliding ejection mechanisms are provided, and these multiple sliding ejection mechanisms are evenly distributed along the circumference of the push tube.

[0013] Furthermore, the sliding ejection mechanism includes an upper push rod, a lower push rod, and an outer push rod;

[0014] The upper push rod, lower push rod, and outer push rod are each provided with one end and two ends;

[0015] The lower end of the push tube is rotatably connected to the two ends of the upper push rod via the first ball pin;

[0016] One end of the upper push rod, one end of the lower push rod, and one end of the outer push rod are rotatably connected by a rotating pin;

[0017] The two ends of the lower push rod are rotatably connected to the outer wall of the central tube through the second ball joint pin;

[0018] An expansion plate is fixedly installed on the inner wall of the rubber cylinder, and the two ends of the outer push rod are rotatably connected to the expansion plate through fixing pins.

[0019] Furthermore, it also includes an upper pressure ring, which is fixedly connected to the outer wall of the push tube;

[0020] The upper pressure ring and push tube assembly is provided with a first groove, and the two side walls of the first groove are provided with a first inner spherical groove. The two ends of the upper push rod are located in the first groove, and the first ball pin cooperates with the first hemispherical groove.

[0021] Furthermore, it also includes a pressure ring; a retaining ring and an annular boss are sequentially arranged on the outer wall of the central tube below the push tube; the pressure ring is fixedly connected to the boss;

[0022] The lower pressure ring and boss assembly is provided with a second groove, and the two side walls of the second groove are provided with second hemispherical grooves. The two ends of the lower push rod are located in the second groove, and the second ball pin cooperates with the second hemispherical groove.

[0023] Furthermore, when the push tube moves down to the retaining ring position, the lower push rod and the outer push rod are aligned radially and press against the expansion plate, which is the maximum outer diameter of the rubber tube.

[0024] Furthermore, the retaining ring is provided with an upper receiving groove, the combination of the boss and the lower pressure ring is provided with a lower receiving groove, and the outer push rod is placed in the lower receiving groove;

[0025] When the push rod is in the axially overlapping position and the rotating pin is below the retaining ring, the upper receiving groove is used to receive and release the upper push rod;

[0026] When the push rod is in the axially aligned position and the rotating pin is above the retaining ring, the upper receiving groove includes a first upper receiving groove and a second upper receiving groove. The first upper receiving groove corresponds to the second groove and is used to retract and release the push rod. The second upper receiving groove corresponds to the lower receiving groove and is used to retract and release the outer push rod.

[0027] Furthermore, the upper end of the rubber tube is fixedly connected to the push tube, and the lower end of the rubber tube is fixedly connected to the central tube below the boss; lubricating oil is injected into the cavity between the rubber tube and the central tube.

[0028] Furthermore, the lower end of the push tube is provided with an axially oriented first inner groove, and the outer wall of the lower end of the push tube is provided with a first inner spherical groove on both sides of the first inner groove; the lower end of the upper pressure ring is provided with a first outer groove, and the inner wall of the upper pressure ring is provided with a first outer spherical groove; the first inner groove and the first outer groove are joined together to form a first groove, and the first inner spherical groove and the first outer spherical groove are joined together to form a first hemispherical groove;

[0029] The upper pressure ring is provided with a first assembly groove on the first outer groove wall, and the first assembly groove corresponds to and communicates with the first outer spherical groove.

[0030] The annular protrusion has an axially oriented second inner groove at its upper end, and the outer wall of the protrusion has second inner spherical grooves on both sides of the second inner groove; the upper end of the lower pressure ring has a second outer groove, and the inner wall of the lower pressure ring has a second outer spherical groove; the second inner groove and the second outer groove are joined together to form a second groove, and the second inner spherical groove and the second outer spherical groove are joined together to form a second hemispherical groove;

[0031] The second outer groove wall is provided with a second assembly groove, which corresponds to and is connected to the second outer spherical groove.

[0032] Furthermore, the push tube and the upper pressure ring are connected by a spline, the push tube and the upper pressure ring are positioned by a step, and the push tube and the upper pressure ring are locked by anti-loosening screws;

[0033] The boss and the lower pressure ring are connected by a spline; the boss and the lower pressure ring are positioned by a step; the boss and the lower pressure ring are locked by anti-loosening screws.

[0034] Furthermore, the outer wall of the expansion plate is bonded to the inner wall of the rubber cylinder;

[0035] The inner wall of the expansion plate is provided with a fixing pin plate; the fixing pin plate is provided with a round hole, and the two ends of the outer push rod are rotatably connected to the fixing pin, and the fixing pin is fixed by interference fit with the round hole.

[0036] Secondly, the present invention provides a packer with an axially compressed radially mechanically expanded rubber sleeve, comprising the axially compressed radially mechanically expanded rubber sleeve described in one aspect; the upper end of the central tube is connected to an upper connector, the outer wall of the upper connector is connected to a piston sleeve via a shear pin, and the upper connector and the piston sleeve are sealed; the lower end of the piston sleeve is connected to and sealed to a push tube, and the upper connector is provided with a hydraulic control line connector, the hydraulic control line connector being in communication with the annulus of the central tube and the piston sleeve.

[0037] Thirdly, the present invention provides a method of using a packer with an axially compressed radially mechanically expanding rubber sleeve, comprising the following steps:

[0038] S1. Connect the hydraulic control line to the hydraulic control line connector;

[0039] S2. When setting is required, pressurize the piston sleeve through the hydraulic control line. The piston sleeve shear pin moves down, pushing the push tube down. The push tube squeezes the rubber sleeve, and the rubber sleeve deforms slightly outward due to the compression. It moves outward with the expansion plate, so that the upper push rod, lower push rod and outer push rod are removed from the dead point, and the inner cavity space of the rubber sleeve is also opened.

[0040] S3. Continue pressurizing, the push tube continues to move down, pushing the upper push rod to move down and swing outward, simultaneously driving the lower push rod to swing outward and the outer push rod to swing outward until the packer is fully seated.

[0041] S4. When the seat seal needs to be released, pressure is released, the piston sleeve moves upward, the push tube moves upward, the rubber sleeve is pulled inward, and at the same time the upper push rod, lower push rod, and outer push rod retract inward until they axially coincide.

[0042] Compared with the prior art, the present invention has the following advantages:

[0043] 1. The rubber tube of the present invention is slidably connected to the central tube through the push tube, so that the rubber tube can shrink to a flat state, and the rubber tube of the present invention has a large expansion distance. This allows the upper push rod, lower push rod, and outer push rod of the sliding ejection mechanism to shrink to an axially overlapping state. Furthermore, during expansion, the rubber tube that is compressed and expands outward can release the dead point state of the upper push rod, lower push rod, and outer push rod, making it easy to open and highly reliable.

[0044] 2. The push tube, upper push rod and lower push rod of the present invention constitute a cylinder compression action assisting crank slider mechanism, and the lower push rod, outer push rod and expansion plate constitute a cylinder expansion assisting crank slider mechanism. The combined use of the two crank slider mechanisms improves the speed of cylinder setting and unsealing, while avoiding the cylinder shoulder protrusion effect.

[0045] 3. This invention can convert the traditional hydraulic expansion rubber sleeve into a rigid mechanical expansion rubber sleeve, thereby improving sealing performance;

[0046] 4. The design of the central tube boss, push tube end, upper pressure ring end and lower pressure ring end of the present invention simplifies assembly and improves the efficiency of the crank slider's fundamental movement.

[0047] 5. This invention can improve the setting and unsealing speed of the stratified packer, enhance the interlayer sealing effect, extend the life of the packer sleeve, and improve the reservoir stratified recovery rate. Attached Figure Description

[0048] Figure 1 A cross-sectional view of an axially compressed radially mechanically expanding rubber sleeve (expansion location);

[0049] Figure 2 This is a cross-sectional view of an axially compressed radially mechanically expanding rubber sleeve (contraction position);

[0050] Figure 3 This is a cross-sectional view of the push tube and upper pressure ring assembly;

[0051] Figure 4 This is a cross-sectional view of the upper pressure ring;

[0052] Figure 5 This is a schematic diagram showing the connection between the upper push rod, lower push rod, and outer push rod.

[0053] Figure 6 This is a schematic diagram of the expansion plate structure;

[0054] Figure 7 A schematic diagram showing the connection of the central tube, push tube, upper push rod, lower push rod, and outer push rod;

[0055] Figure 8 This is a schematic diagram of the assembly of the central tube retaining ring, boss, and lower pressure ring.

[0056] Figure 9 Radial cross-sectional view of the assembly of the central tube boss and the lower pressure ring;

[0057] Figure 10 A schematic diagram illustrating an implementation case of an axially compressed radially mechanically expanding rubber sleeve.

[0058] In the figure: 1 central tube, 101 retaining ring, 102 boss, 103 second spline tooth, 104 second inner groove, 106 second inner spherical groove;

[0059] 2. Push tube, 201. Threaded connecting ring, 202. Sealing ring, 203. First spline tooth, 204. Sealing groove, 205. First inner spherical groove, 206. First inner groove, 207. First positioning step;

[0060] 3. Upper pressure sleeve; 301. Upper locking thread; 302. Upper inner rectangular teeth;

[0061] 4. Glue tube, 401 upper connecting part;

[0062] 5 Upper pressure ring, 501 First spline groove, 502 First assembly groove, 503 First outer spherical groove, 504 First outer groove, 505 First limiting step;

[0063] 601 Upper push rod, 602 Lower push rod, 603 Outer push rod;

[0064] 7. Expansion plate, 701. Fixing pin plate, 702. Round hole;

[0065] 801 First ball pin, 802 Second ball pin, 901 Rotary pin;

[0066] 10. Pressure ring, 1001. Second spline groove, 1002. Second outer groove, 1003. Second assembly groove, 1004. Second outer spherical groove;

[0067] 11. Lower pressure sleeve, 12. Piston sleeve, 13. Upper connector. Detailed Implementation

[0068] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0069] Example 1:

[0070] Please see Figures 1 to 9 The present invention provides an axial compression radial mechanical expansion rubber cylinder, comprising a central tube 1 and a rubber cylinder 4. The rubber cylinder 4 is sleeved on the outer wall of the central tube 1. The lower end of the rubber cylinder 4 is fixedly connected to the central tube 1. The upper end of the rubber cylinder 4 is slidably connected to the central tube 1 through a push tube 2. The push tube 2 is connected to a sliding ejection mechanism inside the rubber cylinder 4. The sliding ejection mechanism is connected to the outer wall of the central tube 1 and the inner wall of the rubber cylinder 4.

[0071] Multiple sliding ejection mechanisms are provided, and these mechanisms are evenly distributed along the circumference of the push tube. Figure 7 As shown.

[0072] The sliding ejection mechanism includes an upper push rod 601, a lower push rod 602, and an outer push rod 603. Each of the upper push rod 601, lower push rod 602, and outer push rod 603 has one end and two ends. The lower end of the push tube 2 is rotatably connected to the two ends of the upper push rod 601 via a first ball joint pin 801. One end of the upper push rod 601, one end of the lower push rod 602, and one end of the outer push rod 603 are rotatably connected via a rotating pin 901. The two ends of the lower push rod 602 are rotatably connected to the outer wall of the central tube 1 via a second ball joint pin 802. A push expansion plate is fixedly installed on the inner wall of the rubber cylinder 4. The two ends of the outer push rod 603 are rotatably connected to the push expansion plate 7 via a fixing pin 902. By controlling the position of the push tube 2, the outer push rod 603 pushes the push expansion plate 7 outward or inward, thereby controlling the expansion and retraction of the rubber cylinder 4.

[0073] Specifically, such as Figure 3As shown, the lower end of the push tube 2 is provided with an axially oriented first inner groove 206, and the outer wall of the lower end of the push tube 2 is provided with first inner spherical grooves 205 on both sides of the first inner groove 206, the first inner spherical grooves 205 communicating with the first inner groove 206; an upper pressure ring 5 is sleeved on the lower end of the outer wall of the push tube 2, the lower end of the upper pressure ring 5 is provided with a first outer groove 504 corresponding to the first inner groove 206, the inner wall of the upper pressure ring 5 is provided with a first outer spherical groove 503 corresponding to the first inner spherical groove 205, and the upper pressure ring 5 is provided with a first assembly groove 502 on the groove wall of the first outer groove 504. The assembly groove 502 corresponds to the first outer spherical groove 503. The bottom of the first assembly groove 502 communicates with the first outer spherical groove 503. The projection of the first assembly groove 502 covers the first outer spherical groove 503. The upper pressure ring 5 is fixedly connected to the push tube 2. The first inner groove 206 and the first outer groove 504 are combined to form the first groove. The first inner spherical groove 205 and the first outer spherical groove 503 are combined to form the first hemispherical groove. The two ends of the upper push rod 601 are located in the first groove. The first ball pin 801 cooperates with and limits the first hemispherical groove on both sides of the first groove.

[0074] The circumferential position, axial depth, and circumferential width of the first inner groove 206 are consistent with the circumferential position, axial depth, and circumferential width of the first outer groove 504; the circumferential width of the first groove formed by the first inner groove 206 and the first outer groove 504 is adapted to the circumferential width of the upper push rod 601, so that the upper push rod 601 can rotate smoothly.

[0075] The first inner spherical groove 205 is located in the axial middle of the first inner groove 206, and the first outer spherical groove 503 is located in the axial middle of the first outer groove 504. Both the first inner spherical groove 205 and the first outer spherical groove 503 are 1 / 4 spherical grooves, and the axial position of the first inner spherical groove 205 is consistent with the axial position of the first outer spherical groove 503. The first hemispherical groove formed by the first inner spherical groove 205 and the first outer spherical groove 503 is matched with the spherical surfaces at both ends of the first ball pin 801.

[0076] The first assembly groove 502 is a 1 / 4 cylindrical groove. The circumferential position of the first assembly groove 502 is consistent with the circumferential position of the first outer spherical groove 503. The diameter of the first assembly groove 502 is adapted to the size of the first outer spherical groove 503, so that when the upper pressure sleeve 5 is slidably installed, the first ball pin 801 passes through the first assembly groove 502 and smoothly enters the first outer spherical groove 503.

[0077] Specifically, such as Figure 3 As shown, the outer wall of the push tube 2 is provided with a first spline tooth 203 above the first inner groove 206, and a first positioning step 207 is provided between the first spline tooth 203 and the first inner groove 206 on the outer wall of the push tube 2; Figure 4As shown, the inner wall of the upper pressure ring 5 is provided with a first spline groove 501 above the first inner spherical groove 205, and the inner wall of the upper pressure ring 5 is provided with a first limiting step 505 between the first spline groove 501 and the first inner spherical groove 205; the first spline tooth 203 cooperates with the first spline groove 501, the first positioning step 207 cooperates with the first limiting step 505, and is fixed with anti-loosening nails to realize the fixed connection between the push tube 2 and the upper pressure ring 5.

[0078] Specifically, such as Figure 8 , Figure 9 As shown, a retaining ring 101 and an annular boss 102 are sequentially arranged on the outer wall of the central tube 1 below the push tube 2. The retaining ring 101 restricts the downward movement of the push tube 2. The upper end of the annular boss 102 is provided with an axially oriented second inner groove 104. The outer wall of the boss 102 is provided with second inner spherical grooves 106 on both sides of the second inner groove 104, and the second inner spherical grooves 106 communicate with the second inner groove 104. A lower pressure ring 10 is sleeved on the outer wall of the annular boss 102. The upper end of the lower pressure ring 10 is provided with a second outer groove 1002 corresponding to the second inner groove 104. The inner wall of the lower pressure ring 10 is provided with a second outer spherical groove 1004 corresponding to the second inner spherical groove 106. The groove 1002 has a second assembly groove 1003 on its wall. The second assembly groove 1003 corresponds to the second outer spherical groove 1004. The bottom of the second assembly groove 1003 communicates with the second outer spherical groove 1004. The projection of the diameter of the second assembly groove 1003 covers the second outer spherical groove 1004. The lower pressure ring 10 is fixedly connected to the boss 102. The second inner groove 104 and the second outer groove 1002 are joined to form a second groove. The second inner spherical groove 106 and the second outer spherical groove 1004 are joined to form a second hemispherical groove. The two ends of the lower push rod 602 are located in the second groove. The second ball pin 801 cooperates with and limits the second hemispherical groove on both sides of the second groove.

[0079] Furthermore, when the push tube 2 moves down to the position of the retaining ring 101, the lower push rod 602 and the outer push rod 603 are aligned radially and press against the expansion plate 7, which is the maximum outer diameter of the rubber sleeve 4.

[0080] The circumferential position, axial depth, and circumferential width of the second inner groove 104 are consistent with the circumferential position, axial depth, and circumferential width of the second outer groove 1002; the circumferential width of the second groove formed by the second inner groove 104 and the second outer groove 1002 is adapted to the circumferential width of the lower push rod 601, so that the upper push rod 601 can rotate smoothly.

[0081] The second inner spherical groove 106 is located in the axial middle of the second inner groove 104, and the second outer spherical groove 1004 is located in the axial middle of the second outer groove 1002. Both the second inner spherical groove 106 and the second outer spherical groove 1004 are 1 / 4 spherical grooves, and the axial position of the second inner spherical groove 106 is consistent with the axial position of the second outer spherical groove 1004. The second hemispherical groove formed by the second inner spherical groove 106 and the second outer spherical groove 1004 is matched with the spherical surfaces at both ends of the second ball pin 801.

[0082] The second assembly groove 1003 is a 1 / 4 cylindrical groove. The circumferential position of the second assembly groove 1003 is consistent with the circumferential position of the second outer spherical groove 1004. The diameter of the second assembly groove 1003 is adapted to the size of the second outer spherical groove 1004, so that when the upper pressure sleeve 5 is slidably installed, the second ball pin 802 passes through the second assembly groove 1003 and smoothly enters the second outer spherical groove 1004.

[0083] Specifically, the outer wall of the boss 102 is provided with a second spline tooth 103 below the second inner groove 104, and a second positioning step is provided between the second spline tooth 103 and the second inner groove 104; the inner wall of the lower pressure ring 10 is provided with a second spline groove 1001 below the second inner spherical groove 106, and a second limiting step is provided between the second spline groove 1001 and the second inner spherical groove 106; the second spline tooth 103 and the second spline groove 1001 cooperate, the second positioning step and the second limiting step cooperate, and are fixed with anti-loosening screws to realize the fixed connection between the boss 102 and the lower pressure ring 10.

[0084] Specifically, such as Figure 6 As shown, the outer wall of the expansion plate 7 is bonded to the inner wall of the rubber cylinder 4; two fixing pin plates 701 are welded to the middle of the inner wall of the expansion plate 7; the fixing pin plate 701 is provided with a round hole 702, the diameter of the round hole 702 is matched with the diameter of the fixing pin 902; the two ends of the outer push rod 603 are rotatably connected to the fixing pin 902, and the fixing pin 902 is fixed by interference fit with the round hole 702.

[0085] Furthermore, to enable the upper push rod 601, lower push rod 602, and outer push rod 603 to move to the axially overlapping position, the retaining ring 101 is provided with an upper receiving groove, the upper end of the boss 102 is provided with an axially oriented lower inner receiving groove 105, and the upper end of the lower pressure ring 10 is provided with a lower outer receiving groove corresponding to the lower inner receiving groove 105. The lower inner receiving groove 105 and the lower outer receiving groove are combined to form a lower receiving groove. The circumferential width of the lower receiving groove is greater than the outer perimeter width of the two fixing pin plates 902 on the outer push rod 603. The rod 603 is placed in the lower receiving groove; when the push rods are axially aligned and the rotating pin 901 is below the retaining ring 101, the upper receiving groove is used to receive the upper push rod 601; when the push rods are axially aligned and the rotating pin 901 is above the retaining ring 101, the upper receiving groove includes a first upper receiving groove 107 and a second upper receiving groove 108. The first upper receiving groove 107 corresponds to the second groove and is used to receive the lower push rod 602. The second upper receiving groove 108 corresponds to the lower receiving groove and is used to receive the outer push rod 603.

[0086] Specifically, it also includes an upper pressure sleeve 3 and a lower pressure sleeve 11; the rubber tube 4 includes an upper connecting part 401, a middle expansion part, and a lower connecting part; the outer wall of the push tube 2 is provided with an upper threaded connecting ring 201 above the upper pressure ring 5; the outer wall of the push tube 2 is provided with an upper concave ring between the upper threaded connecting ring 201 and the upper pressure ring 5; the upper connecting part 401 of the rubber tube 4 is located in the upper concave ring; the inner wall of the upper pressure sleeve 3 is provided with an upper locking thread 301 and an upper inner rectangular tooth 302 from top to bottom; the upper locking thread 301 is connected to the upper threaded connecting ring 201; and the upper inner rectangular tooth 302 is screwed into the upper connecting part of the rubber tube 4. The outer wall of 401 is pressed against the upper connecting part 401; the outer wall of the central tube 1 is provided with a lower threaded connecting ring below the boss 102, and the outer wall of the central tube 1 is provided with a lower concave ring between the lower threaded connecting ring and the boss 102. The lower connecting part of the rubber sleeve 4 is located in the lower concave ring. The lower pressure sleeve 11 is provided with a lower inner rectangular tooth and a lower locking thread from top to bottom. The lower locking thread is connected to the lower threaded connecting ring. The lower inner rectangular tooth is screwed into the outer wall of the lower connecting part of the rubber sleeve 4 to press against the upper connecting part; the inner wall of the middle expansion part is connected to the expansion plate 7, and lubricating oil is injected into the cavity between the rubber sleeve 4 and the central tube 1.

[0087] Specifically, the inner wall of the push tube 2 is provided with a sealing groove 204, and a sealing ring 202 is provided in the sealing groove 204.

[0088] Example 2:

[0089] Based on Example 1, this example provides a method for installing an axially compressed radially mechanically expanding rubber sleeve, comprising the following steps:

[0090] A1. First, put the upper pressure ring 5 on the outside of the push tube 2 so that the first spline tooth 203 contacts the first spline groove 501. Insert the first ball pin 801 into the round holes at both ends of the upper push rod 601. Put the spherical surfaces at both ends of the first ball pin 801 into the first inner spherical groove 205 of the push tube 2. Put the upper pressure sleeve 5 down so that the first outer spherical groove 503 of the upper pressure sleeve 5 fits against the spherical surfaces at both ends of the first ball pin 801. Fix the upper pressure ring 5 and the push tube 2 in relative position by installing anti-loosening pins.

[0091] A2. Insert the rotating pin 901 into the round hole at one end of the upper push rod 601. Install one end of the lower push rod 602 and one end of the outer push rod 603 on both sides of the rotating pin 901 respectively. The rotating pin 901 is installed with an interference fit with the upper push rod 601, and the rotating pin 901 is installed with a clearance fit with the lower push rod 602 and the outer push rod 603. After the rotating pin 901 is installed, press its two ends to form a step to prevent the lower push rod 602 and the outer push rod 603 from falling off.

[0092] A3. The lower pressure ring 10 is inserted from the lower end of the central tube 1. The second spline groove 1001 contacts the second spline tooth 103. The two ends of the lower push rod 602 are inserted into the second ball pin 802. The spherical surfaces at both ends of the second ball pin 802 are placed into the second inner spherical groove 106 of the boss 102 of the central tube 1. The lower pressure ring 10 is moved up so that the second outer spherical groove 1004 matches the spherical surfaces at both ends of the second ball pin 802. The lower pressure ring 10 and the boss 102 are fixed in relative position by installing anti-loosening pins.

[0093] A4. The two ends of the outer push rod 603 are connected to the fixed pin plate 701 on the expansion plate 7 through the fixed pin 902. The outer push rod 603 and the fixed pin 902 are clearance fit, and the fixed pin 902 and the fixed pin plate 701 are interference fit.

[0094] A5. After installing all the upper push rods 601, lower push rods 602, outer push rods 603 and expansion plates 7, lift the push tube 2. The upper push rods 601, lower push rods 602, outer push rods 603 and expansion plates 7 can move freely, and the expansion plates 7 can be tightly attached to the outer walls of the upper pressure ring 5 and the lower pressure ring 10.

[0095] Apply a layer of glue to the outer wall of the expansion plate 7, then put the glue tube 4 over the center tube 1, insert the upper connecting part 401 of the glue tube 4 into the upper concave ring of the push tube 2, insert the lower connecting part of the glue tube 4 into the lower concave ring of the center tube 1, press the middle expansion part of the glue tube 4 to glue the middle expansion part to the expansion plate 7, after glue bonding and fixing, install the lower pressure sleeve 11 at the lower end of the glue tube 4 and lock the lower connecting part, use a tool to open the upper end of the glue tube 4 and pour in some lubricating oil, then install the upper pressure sleeve 3 and lock the upper connecting part 401;

[0096] A5. After the entire set of rubber sleeves 4 is installed, the push tube 2 is pressed down with axial force, which allows the rubber sleeve 4 to shorten axially while freely expanding radially. After the axial force is removed, the rubber sleeve 4 remains in an expanded state. When an upward pulling force is applied to the push tube 2, the rubber sleeve 4 can quickly shrink and return to its original shape.

[0097] Example 3:

[0098] Based on Example 1, this example provides a packer with an axially compressed radially mechanically expanding rubber sleeve.

[0099] The center tube 1 is connected to the center tube of the existing packer, and the push tube 2 is connected to the piston of the existing packer; or the center tube 1 is manufactured integrally with the center tube of the existing packer, and the push tube 2 is manufactured integrally with the piston of the packer.

[0100] By optimizing and adjusting the radial dimensions while keeping the overall structure of the invention unchanged, the existing packer can be modified, and the invention can be promoted and used in the field.

[0101] Specifically, such as Figure 10 As shown, one embodiment of an axially compressed radially mechanically expanding rubber sleeve is used in an existing packer.

[0102] The upper end of the central tube 1 is connected to the upper connector 13. The outer wall of the upper connector 13 is connected to the piston sleeve 12 by a shear pin. The upper connector 13 and the piston sleeve 12 are sealed by a sealing ring. The lower end of the piston sleeve 12 is connected to the push tube 2 and sealed by a sealing ring. The upper connector 13 is provided with a hydraulic control line connector. The hydraulic control line connector is connected to the annulus of the central tube 1 and the piston sleeve 12 to form a hydraulic control packer.

[0103] Example 4:

[0104] Based on Example 3, this example provides a method for using a packer with an axially compressed radially mechanically expanding rubber sleeve, including the following steps:

[0105] S1. Connect the hydraulic control line to the hydraulic control line connector;

[0106] S2. When setting is required, hydraulic oil is injected into the piston sleeve 12 through the hydraulic control line. The piston sleeve 12 shears the shear pin and moves down, pushing the push tube 2 down. At the same time as the push tube 2 moves down, it axially squeezes the rubber cylinder 4. The rubber cylinder 4 is deformed by the compression and expands slightly outward, taking the expansion plate 7 outward, so that the upper push rod 601, lower push rod 602, and outer push rod 603 are removed from the dead point, and the inner cavity space of the rubber cylinder 4 is also opened up.

[0107] S3. Continue pressurizing, push tube 2 continues to move down, pushing the upper push rod 601 down and swinging outward, simultaneously driving the lower push rod 602 to swing outward and the outer push rod 603 to swing outward until the packer is completely set; when push tube 2 moves down to the position of retaining ring 101, the lower push rod 602 and the outer push rod 603 are almost in a radial line against the expansion plate 7, causing the rubber sleeve 4 to expand to its maximum outer diameter;

[0108] S4. When the seat seal needs to be released, pressure is released, piston sleeve 12 moves upward, push tube 2 moves upward, rubber sleeve 4 is pulled inward, upper push rod 601, lower push rod 602, and outer push rod 603 retract inward until upper push rod 601, lower push rod 602, and outer push rod 603 axially coincide.

[0109] This axially compressed radially expanding packer sleeve can contract axially and expand radially, increasing the packer setting speed. At the same time, the sealing performance is not affected by downhole reservoir pressure fluctuations, improving the efficiency of reservoir stratification and exploitation. This invention can be used for hydraulic rapid setting and unsealing of packer sleeves, as well as mechanical rapid setting and unsealing. In addition, based on the sleeve deformation rate, it can achieve packer setting of large annulus between tubing and casing, and the setting is reliable and has a wide range of applications.

[0110] All components not discussed in detail in this application, as well as the connection methods of these components, are well-known technologies in this field. They can be directly applied and will not be elaborated further.

[0111] In this invention, the term "multiple" refers to two or more unless otherwise explicitly defined. The terms "install," "connect," "link," and "fix" should be interpreted broadly. For example, "connect" can be a fixed connection, a detachable connection, or an integral connection; "link" can be a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0112] In the description of this invention, it should be understood that the terms "upper," "lower," "left," "right," "front," "rear," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or unit referred to must have a specific orientation or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0113] In the description of this specification, the terms "one embodiment," "some embodiments," "specific embodiment," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0114] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. An axially compressed radially mechanically expanding rubber sleeve, comprising a central tube and a rubber sleeve, wherein the rubber sleeve is sleeved on the outer wall of the central tube, characterized in that, The lower end of the rubber tube is fixedly connected to the central tube, and the upper end of the rubber tube is slidably and sealed to the central tube through a push tube; The push tube is connected to a sliding ejection mechanism inside the rubber cylinder. The sliding ejection mechanism is connected to the outer wall of the central tube and the inner wall of the rubber cylinder.

2. The axially compressed radially mechanically expanding rubber sleeve according to claim 1, characterized in that, Multiple sliding ejection mechanisms are provided, and these mechanisms are evenly distributed along the circumference of the push tube.

3. The axially compressed radially mechanically expanding rubber sleeve according to claim 1 or 2, characterized in that, The sliding ejection mechanism includes an upper push rod, a lower push rod, and an outer push rod; The upper push rod, lower push rod, and outer push rod are each provided with one end and two ends; The lower end of the push tube is rotatably connected to the two ends of the upper push rod via the first ball pin; One end of the upper push rod, one end of the lower push rod, and one end of the outer push rod are rotatably connected by a rotating pin; The two ends of the lower push rod are rotatably connected to the outer wall of the central tube through the second ball joint pin; An expansion plate is fixedly installed on the inner wall of the rubber cylinder, and the two ends of the outer push rod are rotatably connected to the expansion plate through fixing pins.

4. The axially compressed radially mechanically expanding rubber sleeve according to claim 3, characterized in that, It also includes an upper pressure ring, which is fixedly connected to the outer wall of the push tube; The upper pressure ring and push tube assembly is provided with a first groove, and the two side walls of the first groove are provided with a first inner spherical groove. The two ends of the upper push rod are located in the first groove, and the first ball pin cooperates with the first hemispherical groove.

5. The axially compressed radially mechanically expanding rubber sleeve according to claim 4, characterized in that, It also includes a pressure ring; a retaining ring and an annular boss are sequentially arranged on the outer wall of the central tube below the push tube; the pressure ring and the boss are fixedly connected; The lower pressure ring and boss assembly is provided with a second groove, and the two side walls of the second groove are provided with second hemispherical grooves. The two ends of the lower push rod are located in the second groove, and the second ball pin cooperates with the second hemispherical groove.

6. The axially compressed radially mechanically expanding rubber sleeve according to claim 5, characterized in that, When the push tube moves down to the retaining ring position, the lower push rod and the outer push rod are aligned radially and press against the expansion plate. This is the maximum outer diameter of the rubber tube.

7. The axially compressed radially mechanically expanding rubber sleeve according to claim 5, characterized in that, The retaining ring is provided with an upper receiving groove, the combination of the boss and the lower pressure ring is provided with a lower receiving groove, and the outer push rod is placed in the lower receiving groove; When the push rod is in the axially overlapping position and the rotating pin is below the retaining ring, the upper receiving groove is used to receive and release the upper push rod; When the push rod is in the axially aligned position and the rotating pin is above the retaining ring, the upper receiving groove includes a first upper receiving groove and a second upper receiving groove. The first upper receiving groove corresponds to the second groove and is used to retract and release the push rod. The second upper receiving groove corresponds to the lower receiving groove and is used to retract and release the outer push rod.

8. The axially compressed radially mechanically expanding rubber sleeve according to claim 7, characterized in that, The upper end of the rubber tube is fixedly connected to the push tube, and the lower end of the rubber tube is fixedly connected to the central tube below the boss; lubricating oil is injected into the cavity between the rubber tube and the central tube.

9. The axially compressed radially mechanically expanding rubber sleeve according to claim 5, characterized in that, The lower end of the push tube is provided with a first inner groove running axially, and the outer wall of the lower end of the push tube is provided with a first inner spherical groove on both sides of the first inner groove; the lower end of the upper pressure ring is provided with a first outer groove, and the inner wall of the upper pressure ring is provided with a first outer spherical groove; the first inner groove and the first outer groove are combined to form a first groove, and the first inner spherical groove and the first outer spherical groove are combined to form a first hemispherical groove. The upper pressure ring is provided with a first assembly groove on the first outer groove wall, and the first assembly groove corresponds to and communicates with the first outer spherical groove. The annular protrusion has an axially oriented second inner groove at its upper end, and the outer wall of the protrusion has second inner spherical grooves on both sides of the second inner groove; the upper end of the lower pressure ring has a second outer groove, and the inner wall of the lower pressure ring has a second outer spherical groove; the second inner groove and the second outer groove are joined together to form a second groove, and the second inner spherical groove and the second outer spherical groove are joined together to form a second hemispherical groove; The second outer groove wall is provided with a second assembly groove, which corresponds to and is connected to the second outer spherical groove.

10. The axially compressed radially mechanically expanding rubber sleeve according to claim 5, characterized in that, The push tube and the upper pressure ring are connected by a spline, the push tube and the upper pressure ring are positioned by a step, and the push tube and the upper pressure ring are locked by an anti-loosening pin; The boss and the lower pressure ring are connected by a spline; the boss and the lower pressure ring are positioned by a step; the boss and the lower pressure ring are locked by anti-loosening screws.

11. The axially compressed radially mechanically expanding rubber sleeve according to claim 3, characterized in that, The outer wall of the expansion plate is bonded to the inner wall of the rubber cylinder; The inner wall of the expansion plate is provided with a fixing pin plate; the fixing pin plate is provided with a round hole, and the two ends of the outer push rod are rotatably connected to the fixing pin, and the fixing pin is fixed by interference fit with the round hole.

12. A packer with an axially compressed radially mechanically expanding rubber sleeve, characterized in that, Including the axially compressed radially mechanically expanding rubber sleeve as described in claim 3; The upper end of the central tube is connected to the upper connector, and the outer wall of the upper connector is connected to the piston sleeve through a shear pin, and the upper connector and the piston sleeve are sealed. The lower end of the piston sleeve is connected to and sealed with the push tube, and the upper connector is provided with a hydraulic control line connector, which is connected to the annulus of the central tube and the piston sleeve.

13. A method of using a packer with an axially compressed radially mechanically expanding rubber sleeve, characterized in that, Using the packer of claim 12 includes the following steps: S1. Connect the hydraulic control line to the hydraulic control line connector; S2. When setting is required, pressurize the piston sleeve through the hydraulic control line. The piston sleeve shear pin moves down, pushing the push tube down. The push tube squeezes the rubber sleeve, and the rubber sleeve deforms slightly outward due to the compression. It moves outward with the expansion plate, so that the upper push rod, lower push rod and outer push rod are removed from the dead point, and the inner cavity space of the rubber sleeve is also opened. S3. Continue pressurizing, the push tube continues to move down, pushing the upper push rod to move down and swing outward, simultaneously driving the lower push rod to swing outward and the outer push rod to swing outward until the packer is fully seated. S4. When the seat seal needs to be released, pressure is released, the piston sleeve moves upward, the push tube moves upward, the rubber sleeve is pulled inward, and at the same time the upper push rod, lower push rod, and outer push rod retract inward until they axially coincide.

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