Hydraulic packer capable of being quickly set and unset

Abstract

The utility model discloses a hydraulic packer capable of being quickly set and unset, and particularly relates to the technical field of oil and gas development. The hydraulic packer comprises an upper connector, a central pipe, a cylinder sleeve, a piston, a sealing ring, a connecting ring, an upper push rod, a locking piece, a lower push rod, a spring, an outer barrel, an upper bearing seat, a thrust bearing, a lower bearing seat, a limiting ring, a pressing ring, an upper rubber barrel, a middle rubber barrel, a lower rubber barrel and a lower connector. When setting is needed, the packer keeps or unlocks the packing state by fixing the locking piece and rotating the lower push rod, and the lower push rod is reset by utilizing the elastic restoring force of the spring, the upper rubber sleeve, the middle rubber sleeve and the lower rubber sleeve, so that unsetting is completed; therefore, the unsealing can be realized without cutting off the pin, meanwhile, multiple times of continuous setting and unsealing can be realized, the problems in the prior art are solved, and the operation efficiency is improved.

Description

Technical Field

[0001] This utility model relates to the field of oil and gas development technology, and in particular to a hydraulic packer that can be quickly set and unset. Background Technology

[0002] A packer is a specialized tool widely used in downhole casing or open holes to isolate oil, gas, and water layers. Inside the packer is an elastic sealing element that seals the annular space between tubing of different sizes and the wellbore, as well as between the tubing and the casing, isolating the producing layer, thereby controlling fluid production and protecting the casing.

[0003] Hydraulic packers are typically inserted directly into the tubing at a designated location along with the tubing string. Internal pressure is then applied to compress the upper, middle, and lower rubber sleeves, sealing the annular space between the packer and the casing. For production wells, different production layers need to be sealed during production. Simultaneously, the packer needs to be released during well washing and when the production tubing string is removed to ensure unobstructed flow in the annulus. However, in practical applications, packers suffer from cumbersome release procedures, difficulty in release, and low efficiency. Utility Model Content

[0004] The purpose of this invention is to design a hydraulic packer to overcome the problems existing in the prior art, making it easy to unseal and ensuring the smooth progress of the unsealing operation.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] A hydraulic packer for rapid setting and unsetting includes an upper connector, a central tube, a cylinder liner, a piston, a sealing ring, a connecting ring, an upper push rod, a locking element, a lower push rod, a spring, an outer cylinder, an upper bearing housing, a thrust bearing, a lower bearing housing, a limit ring, a pressure ring, an upper rubber sleeve, a middle rubber sleeve, a lower rubber sleeve, and a lower connector.

[0007] The lower part of the upper connector is connected to the upper part of the cylinder liner and the upper part of the central tube. A piston is installed between the central tube and the cylinder liner. A pressure transmission hole is provided at the upper end of the central tube. The piston and the upper push rod are connected by a connecting ring.

[0008] The locking component is fitted onto the outer surfaces of the upper and lower push rods, and the upper part of the locking component is connected to the lower part of the cylinder liner and the upper part of the outer cylinder, respectively.

[0009] The spring is installed in the annular space formed by the lower push rod and the outer cylinder. The lower end of the outer cylinder is connected to the lower end of the lower push rod by a sliding seal. The lower end of the lower push rod is connected to the upper bearing seat.

[0010] The lower bearing housing is installed inside the upper bearing housing and is limited by a limiting ring. A thrust bearing is installed between the upper bearing housing and the lower bearing housing.

[0011] The pressure ring, upper rubber cylinder, middle rubber cylinder, and lower rubber cylinder are sequentially fitted onto the lower end of the central tube, and a lower connector is connected by threads.

[0012] Optionally or preferably, the upper end of the upper push rod is provided with a first stepped surface, and first rectangular guide blocks are evenly distributed around the circumference of the first stepped surface. The lower end of the upper push rod is provided with a first sawtooth structure.

[0013] Optionally or preferably, the upper end of the push rod is provided with a second stepped surface, and second rectangular guide blocks are evenly distributed around the circumference of the second stepped surface. The second rectangular guide blocks are provided with a first inclined surface, which is in the same direction as the tooth surface of the first sawtooth structure. The lower end of the push rod is provided with a first cylindrical surface.

[0014] Optionally or preferably, the locking member is provided with several support blocks, a first guide groove and a second guide groove, and the outer side of the upper end of the locking member is provided with external threads to connect the cylinder liner and the outer cylinder.

[0015] Optionally or preferably, the second guide groove is axially aligned with the first guide groove, and the upper end of the second guide groove is provided with an inclined surface in the same direction as the tooth surface of the first sawtooth structure.

[0016] Optionally or preferably, the lower end of the support block is provided with a second serrated structure, which can cooperate with the inclined surface of the upper end of the second rectangular guide block.

[0017] Optionally or preferably, the first rectangular guide block can cooperate with the first guide groove to restrict the circumferential displacement of the upper push rod, and the second rectangular guide block can cooperate with the second guide groove.

[0018] Optionally or preferably, the lower end of the lower push rod is provided with an upper bearing seat, a thrust bearing, a lower bearing seat and a limiting ring. The lower bearing seat and the upper bearing seat are connected by a sliding seal. The limiting ring is fixedly connected to the lower end of the upper bearing seat. A gap is left between the limiting ring and the pressure ring.

[0019] This utility model provides a hydraulic packer for rapid setting and unsetting. Its advantages are: by fixing the locking element and rotating the lower push rod, the packer can maintain or unlock the sealing state. The elastic restoring force of the spring, upper rubber cylinder, middle rubber cylinder and lower rubber cylinder is used to reset the lower push rod, thus completing the unsealing. Therefore, this utility model can unseal without cutting the pin, and can set and unseal repeatedly, overcoming the problems of the prior art and improving the efficiency of operation. Attached Figure Description

[0020] Figure 1This is a schematic diagram of the overall structure of this utility model;

[0021] Figure 2 This is a structural schematic diagram of an embodiment of the present utility model;

[0022] Figure 3 This is a structural diagram of the upper push rod;

[0023] Figure 4 This is a structural schematic diagram of the locking component;

[0024] Figure 5 This is a schematic diagram of the lower push rod;

[0025] Figure 6 This is a schematic diagram of the internal structure of a thrust bearing.

[0026] In the diagram: 1. Upper connector; 2. Central tube; 201. Pressure transmission hole; 3. Cylinder liner; 4. Piston; 5. Sealing ring; 6. Connecting ring; 7. Upper push rod; 701. First stepped surface; 702. First rectangular guide block; 703. First serrated structure; 8. Locking element; 801. First guide groove; 802. External thread; 803. Support block; 804. Second guide groove; 805. Second serrated structure; 9. Lower push rod; 901. Second stepped surface; 902. Second rectangular guide block; 903. First cylindrical surface; 904. Rectangular groove; 10. Spring; 11. Outer cylinder; 12. Upper bearing seat; 13. Thrust bearing; 14. Lower bearing seat; 15. Limiting ring; 16. Pressure ring; 17. Upper rubber sleeve; 18. Middle rubber sleeve; 19. Lower rubber sleeve; 20. Lower connector. Detailed Implementation

[0027] The technical solution of the present invention will be further described in detail below through embodiments and in conjunction with the accompanying drawings.

[0028] like Figures 1 to 6 As shown, the embodiment of this utility model includes an upper connector 1, a central tube 2, a cylinder liner 3, a piston 4, a sealing ring 5, a connecting ring 6, an upper push rod 7, a locking element 8, a lower push rod 9, a spring 10, an outer cylinder 11, an upper bearing seat 12, a thrust bearing 13, a lower bearing seat 14, a limiting ring 15, a pressure ring 16, an upper rubber cylinder 17, a middle rubber cylinder 18, a lower rubber cylinder 19, and a lower connector 20.

[0029] The lower part of the upper connector 1 is connected to the upper part of the cylinder liner 3 and the upper part of the central tube 2. A piston 4 is installed between the central tube 2 and the cylinder liner 3. A pressure transmission hole 201 is provided at the upper end of the central tube 2. The piston 4 is connected to the upper push rod 7 through a connecting ring 6.

[0030] The locking element 8 is fitted onto the outer surface of the upper push rod 7 and the lower push rod 9, and the upper part of the locking element 8 is connected to the lower part of the cylinder liner 3 and the upper part of the outer cylinder 11, respectively.

[0031] The spring 10 is installed in the annular space formed by the lower push rod 9 and the outer cylinder 11. The lower end of the outer cylinder 11 is connected to the lower end of the lower push rod 9 by a sliding seal. The lower end of the lower push rod 9 is connected to the upper bearing seat 12.

[0032] The lower bearing housing 14 is installed inside the upper bearing housing and is limited by the limiting ring 15. A thrust bearing 13 is installed between the upper bearing housing 12 and the lower bearing housing 14.

[0033] The pressure ring 16, upper rubber cylinder 17, middle rubber cylinder 18, and lower rubber cylinder 19 are sequentially fitted onto the lower end of the central tube 2, and a lower connector 20 is connected by threads.

[0034] As an optional implementation, the hydraulic packer for quick sealing and unsealing is characterized in that the upper end of the upper push rod 7 is provided with a first stepped surface 701, the first stepped surface 701 is evenly distributed with first rectangular guide blocks 702, and the lower end surface of the upper push rod 7 is provided with a first serrated structure 703.

[0035] As an optional implementation, the hydraulic packer for quick sealing and unsealing is characterized in that the upper end of the lower push rod 9 is provided with a second stepped surface 901, the second stepped surface 901 is circumferentially distributed with second rectangular guide blocks 902, the second rectangular guide blocks 902 are provided with a first inclined surface 905, which is in the same inclination direction as the tooth surface of the first sawtooth structure 703, and the lower end of the lower push rod 9 is provided with a first cylindrical surface 903.

[0036] As an optional implementation, the hydraulic packer for quick sealing and unsealing is characterized in that the locking member 8 is provided with a plurality of support blocks 803, a first guide groove 801 and a second guide groove 804, and the outer side of the upper end of the locking member 8 is provided with an external thread 802, which connects the cylinder liner 3 and the outer cylinder 11.

[0037] As an optional implementation, the hydraulic packer for quick sealing and unsealing is characterized in that the second guide groove 804 is axially aligned with the first guide groove 801, and the upper end of the second guide groove 804 is provided with an inclined surface in the same direction as the tooth surface of the first sawtooth structure 703.

[0038] As an optional implementation, the hydraulic packer for quick sealing and unsealing is characterized in that the lower end of the support block 803 is provided with a second serrated structure 805, which can cooperate with the inclined surface of the upper end of the second rectangular guide block 902.

[0039] As an optional implementation, the hydraulic packer for quick sealing and unsealing is characterized in that the first rectangular guide block 702 can cooperate with the first guide groove 801 to restrict the circumferential displacement of the upper push rod 7, and the second rectangular guide block (902) can cooperate with the second guide groove 804.

[0040] As an optional implementation, the hydraulic packer for quick sealing and unsealing is characterized in that the lower end of the lower push rod 9 is provided with an upper bearing seat 12, a thrust bearing 13, a lower bearing seat 14 and a limiting ring 15, the lower bearing seat 14 and the upper bearing seat 12 are connected by a sliding seal, the limiting ring 15 is fixedly connected to the lower end of the upper bearing seat 12, and a gap is left between the limiting ring 15 and the pressure ring 16.

[0041] The working principle of this utility model is as follows:

[0042] When sealing is required, the packer is lowered to the designed position and pressure is applied into the central tube. Hydraulic pressure is transmitted from the pressure transmission hole 201 to the piston 4, causing the upper push rod 7 to descend along the first guide groove 801 on the inner side of the upper end of the locking member 8. At the same time, the lower push rod 9 is pushed down along the second guide groove 804 at the lower end of the locking member 8. The pressure ring 16 is pushed downward by the lower push rod 9, compressing the sealing sleeves of the upper, middle, and lower rubber tubes. After the lower push rod 9 is pushed out of the second guide groove 804 at the lower end of the locking member 8 by the upper push rod 7, the lower push rod 9 will rotate at a certain angle along the inclined tooth surface of the first serrated structure 703 at the lower end of the upper push rod 7 under pressure. At this time, the pressure is released, and the upper end of the second rectangular guide block 902 engages with the second serrated structure 805 at the lower end of the support block 803 to prevent the lower push rod 9 from returning to its original position and to maintain the seal.

[0043] When unsealing, pressure is applied to the central tube, and the hydraulic system pushes the upper push rod 7 downward. The upper push rod 7 pushes the lower push rod 9 downward, and the second rectangular guide block 902 separates from the support block. Under pressure, the lower push rod 9 rotates again at a certain angle. After depressurization, the lower push rod 9 is pushed upward by the elastic restoring force of the spring 10, the upper rubber cylinder (17), the middle rubber cylinder (18), and the lower rubber cylinder (19). The second rectangular guide block 902 will enter the second guide groove 804 along the inclined surface of the second sawtooth structure 805 at the lower end of the support block 803, and continue to move upward along the second guide groove 804 until the upper end face of the piston 4 contacts the lower end face of the upper connector 1, thus completing the unsealing.

Claims

1. A hydraulic packer for rapid setting and unsetting, characterized in that, Including upper connector (1), center tube (2), cylinder liner (3), piston (4), sealing ring (5), connecting ring (6), upper push rod (7), locking element (8), lower push rod (9), spring (10), outer cylinder (11), upper bearing seat (12), thrust bearing (13), lower bearing seat (14), limit ring (15), pressure ring (16), upper rubber sleeve (17), middle rubber sleeve (18), lower rubber sleeve (19), and lower connector (20), among which, The lower part of the upper connector (1) is connected to the upper part of the cylinder liner (3) and the upper part of the central tube (2). A piston (4) is installed between the central tube (2) and the cylinder liner (3). A pressure transmission hole (201) is provided at the upper end of the central tube (2). The piston (4) is connected to the upper push rod (7) through a connecting ring (6). The locking element (8) is fitted onto the outer surfaces of the upper push rod (7) and the lower push rod (9), and the upper part of the locking element (8) is connected to the lower part of the cylinder liner (3) and the upper part of the outer cylinder (11), respectively. The spring (10) is installed in the annular space formed by the lower push rod (9) and the outer cylinder (11). The lower end of the outer cylinder (11) is connected to the lower end of the lower push rod (9) by a sliding seal. The lower end of the lower push rod (9) is connected to the upper bearing seat (12). The lower bearing housing (14) is installed inside the upper bearing housing and is limited by a limiting ring (15). A thrust bearing (13) is installed between the upper bearing housing (12) and the lower bearing housing (14). The pressure ring (16), upper rubber cylinder (17), middle rubber cylinder (18), and lower rubber cylinder (19) are sequentially fitted onto the lower end of the central tube (2), and are connected by a threaded connector (20).

2. The hydraulic packer for rapid setting and unsetting according to claim 1, characterized in that, The upper end of the upper push rod (7) is provided with a first step surface (701), and a first rectangular guide block (702) is evenly distributed around the first step surface (701). The lower end surface of the upper push rod (7) is provided with a first sawtooth structure (703).

3. The hydraulic packer for rapid setting and unsetting according to claim 1, characterized in that, The upper end of the push rod (9) is provided with a second step surface (901), and a second rectangular guide block (902) is evenly distributed around the second step surface (901). The second rectangular guide block (902) is provided with a first inclined surface (905), which is in the same direction as the tooth surface of the first sawtooth structure (703). The lower end of the push rod (9) is provided with a first cylindrical surface (903).

4. A hydraulic packer for rapid setting and unsetting according to claim 2, characterized in that, The locking member (8) is provided with several support blocks (803), a first guide groove (801) and a second guide groove (804). The upper outer side of the locking member (8) is provided with an external thread (802) to connect the cylinder liner (3) and the outer cylinder (11). The second guide groove (804) is axially aligned with the first guide groove (801), and the upper end of the second guide groove (804) is provided with an inclined surface in the same direction as the tooth surface of the first sawtooth structure (703).

5. A hydraulic packer for rapid setting and unsetting according to claim 4, characterized in that, The lower end of the support block (803) is provided with a second sawtooth structure (805), which can cooperate with the inclined surface of the upper end of the second rectangular guide block (902).

6. A hydraulic packer for rapid setting and unsetting according to claim 5, characterized in that, The first rectangular guide block (702) can cooperate with the first guide groove (801) to restrict the circumferential displacement of the upper push rod (7), and the second rectangular guide block (902) can cooperate with the second guide groove (804).

7. A hydraulic packer for rapid setting and unsetting according to claim 1, characterized in that, The lower end of the lower push rod (9) is provided with an upper bearing seat (12), a thrust bearing (13), a lower bearing seat (14) and a limiting ring (15). The lower bearing seat (14) and the upper bearing seat (12) are connected by a sliding seal. The limiting ring (15) is fixedly connected to the lower end of the upper bearing seat (12). A gap is left between the limiting ring (15) and the pressure ring (16).

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