Mechanical-hydraulic combined cup packer

Abstract

The invention discloses a mechanical-hydraulic combined cup packer, and particularly relates to the field of well completion of petroleum and natural gas development. A mechanical-hydraulic combined cup packer comprises an upper hydraulic cylinder connector, an upper center pipe, a wedge-shaped top barrel, an upper slip, a center barrel upper portion, a center barrel lower portion, an elastic cup, a lower slip, a lower center pipe, a lower hydraulic cylinder connector, an outer sleeve, a one-way valve set A, a cup sleeve, a one-way valve set B and a fixing clamp. Seat hanging is carried out through the upper slip and the lower slip, sealing is carried out through the two elastic leather cups which are installed in the up-down reverse direction, self-locking is achieved through the one-way valve set A and the one-way valve set B, the sealing capacity of the packer is improved, the development difficulty of deep oil and gas resources is further lowered, and a novel tool choice is provided for development of other well drilling and completion processes.

Description

Technical Field

[0001] The invention relates to a matching device for oil production downhole, in particular to a mechanical-liquid combined leather cup packer. Background Art

[0002] The packer is an important tool in the cementing and exploitation process of oil and gas fields. With the continuous deepening of oil and gas field development, the reliability, temperature resistance, pressure resistance and sealing requirements of downhole tools such as packers are constantly increasing. In particular, when the packer is sealing the open hole section, it is difficult for the packer to effectively isolate the uneven well wall. At the same time, the downhole environment is complex and the force of the pipe string is complex. After working for a period of time, the packer has the risk of damage to the rubber cylinder, unstable movement, and premature unsealing. More seriously, it may cause deformation and damage to the pipe string.

[0003] The existing Chinese patent document application number CN 202411077949.1 discloses an external pipe packer for cementing, including a packer body, the packer body includes a center pipe, an upper joint, a pressure seat, a tile seat, a plurality of slips and two rubber cylinders, wherein the center pipe includes an upper pipe and a lower pipe, the upper pipe is fixedly connected to the upper joint, the lower pipe is fixedly connected to the tile seat, and a clamping groove is formed on one side of the upper part of the slip close to the tile seat; it also includes a plurality of limiting mechanisms, and the plurality of limiting mechanisms are arranged in an array uniformly at equal angles along the circumferential direction of the pressure seat, the center pipe includes an upper pipe and a lower pipe, each limiting mechanism includes a limiting shaft, a limiting spring and an anti-slip mechanism, one end of the limiting shaft is slidably connected to the upper pipe, and the other end is fixedly connected to the lower pipe, the limiting spring is sleeved on the outside of the limiting shaft, the two ends of the limiting spring are respectively fixedly connected to the upper pipe and the lower pipe, and the anti-slip mechanism is connected to the pressure seat. The device prevents the slip from being further expanded when the rubber cylinder is expanded after the slip is tightly stretched against the inner side of the pipe wall, thereby causing damage to the pipe wall.

[0004] The existing Chinese patent document CN 202411065118.2 discloses an adjustable oil well packer for oil development, including a shell, a sealing pressure plate, a sealing rubber block, and a regulating component, wherein the regulating component includes a first driving rod, a driving disc, a clutch disc, a control disc, and a second driving rod. The clutch disc is configured to be composed of a plurality of fan-shaped discs, and the plurality of fan-shaped discs can independently move vertically. When the sealing rubber block is deformed to fit the inner wall of the oil pipe, if the driving disc continues to rotate, and the force tooth ring or the latch teeth are partially worn, or debris is stuck between the force tooth ring and the latch teeth, then the plurality of fan-shaped discs that can independently move vertically can independently move in response to the above situation, disperse the local pressure, and extend the service life of the driving disc or the fan-shaped disc, and when a certain fan-shaped disc or the latch teeth is damaged, it can be replaced separately, reducing the maintenance cost. However, the above patent document still has the following defects during implementation:

[0005] In actual use, the above solution is difficult to implement, the reliability of the tool is low, and the use of traditional rubber sleeves has little effect on improving the overall sealing performance of the packer.

[0006] In view of this, a new mechanical-liquid combined leather cup packer is needed to solve the problems existing in the prior art. Summary of the invention

[0007] The main purpose of the present invention is to provide a mechanical-liquid combined leather cup packer, which has the advantages of stable structure, high reliability, strong sealing performance, etc., and solves the problem that the packer is prone to failure.

[0008] To achieve the above object, the technical solution adopted by the present invention is:

[0009] The present invention provides a mechanical-liquid combined leather cup packer, comprising an upper hydraulic cylinder joint, an upper central tube, a wedge-shaped top tube, an upper slip, an upper central tube, a lower central tube, an elastic leather cup, a lower slip, a lower central tube, a lower hydraulic cylinder joint, an outer sleeve, a one-way valve group A, a leather cup sleeve, a one-way valve group B, and a fixing clamp, wherein:

[0010] The upper cylinder joint is connected to the wedge-shaped top cylinder to form a sealed hydraulic oil chamber;

[0011] The upper center tube is sleeved inside the upper cylinder joint, and the lower end is connected to the upper part of the center tube;

[0012] The upper part of the central tube is connected to the lower part of the central tube;

[0013] The lower part of the central tube is connected to the lower central tube;

[0014] The lower cylinder joint is connected to the wedge-shaped top cylinder at the bottom to form a sealed hydraulic oil chamber;

[0015] The lower center pipe is sleeved inside the lower liquid cylinder joint.

[0016] Optionally or preferably, the elastic leather cup is formed of a high temperature and high pressure resistant elastic material, including but not limited to fluororubber; the elastic leather cup is in an unfolded state when it is not under stress, and two elastic leather cups installed opposite to each other are respectively mounted on the upper part and the lower part of the center tube; the inner diameter of the leather cup sleeve is smaller than the unfolded outer diameter of the elastic leather cup.

[0017] Optionally or preferably, the n upper cavas are circumferentially installed on the outside of the upper center tube, n>3; the n lower cavas are circumferentially installed on the outside of the lower center tube, n>3; the outer sleeve is sleeved on the outside of the upper cavas and the lower cavas, and the outer sleeve is hollowed out corresponding to the upper cavas and the lower cavas; the movement of the upper cavas and the lower cavas is limited by the upper prism of the outer sleeve; the fixed clamp is sleeved on the outside of the upper cavas and the lower cavas, the fixed clamp can prevent the upper cavas and the lower cavas from hanging prematurely, and the fixed clamp can collapse automatically under the external expansion force.

[0018] Optionally or preferably, a circumferential one-way valve group A is installed on the boss in the middle of the upper center tube to divide the hydraulic oil chamber in the upper cylinder joint into self-locking cylinder A and self-locking cylinder B. The one-way valve group A limits the flow of hydraulic oil from self-locking cylinder A to self-locking cylinder B.

[0019] Optionally or preferably, a circumferential one-way valve group B is installed on the boss in the middle of the lower center tube to divide the hydraulic oil chamber in the lower cylinder joint into a self-locking cylinder C and a self-locking cylinder D. The one-way valve group B limits the hydraulic oil from flowing from the self-locking cylinder D to the self-locking cylinder C.

[0020] Compared with the prior art, the embodiments of the present invention have at least the following beneficial effects:

[0021] 1. The present invention adopts elastic leather cup seal, which makes the packer have stronger sealing ability than the traditional rubber cylinder seal. The packer is distributed with two elastic leather cups installed opposite to each other. After the annulus protection fluid is injected into the upper part, the lower part of the formation pressure is offset, so that the sealing performance is improved.

[0022] 2. The structure of the present invention can transmit the lower formation pressure to the slips through the wedge-shaped top tube. The greater the lower formation pressure, the greater the slip anchoring force. A self-locking hydraulic oil chamber is provided to limit the movement of the center tube through a one-way valve to achieve the purpose of self-locking. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 This is a schematic diagram of the overall appearance structure of this patent;

[0024] Figure 2 This is a schematic diagram of the internal structure of this patent;

[0025] Figure 3 This is a schematic diagram of the structure of this patent after sealing;

[0026] Figure 4 It is a schematic diagram of the partial cross-section A structure of this patent;

[0027] Figure 5 This is a schematic diagram of the partial cross-section B structure of this patent.

[0028] In the figure: 1. upper cylinder joint; 2. upper center tube; 3. wedge-shaped top tube; 4. upper slip; 5. upper part of center tube; 6. lower part of center tube; 7. elastic leather cup; 8. lower slip; 9. lower center tube; 10. lower cylinder joint; 11. outer sleeve; 12. one-way valve group A; 13. leather cup sleeve; 14. one-way valve group B; 15. self-locking cylinder A; 16. self-locking cylinder B; 17. self-locking cylinder C; 18. self-locking cylinder D; 19. fixing clamp. DETAILED DESCRIPTION

[0029] In order to make the technical means, creative features, objectives and effects of this patent easy to understand, the present invention is further described below in conjunction with specific implementation methods. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other implementation methods obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0030] like Figures 1 to 5 As shown:

[0031] The present invention provides a mechanical-liquid combined leather cup packer, comprising an upper hydraulic cylinder joint 1, an upper central tube 2, a wedge-shaped top tube 3, an upper slip 4, a central tube upper part 5, a central tube lower part 6, an elastic leather cup 7, a lower slip 8, a lower central tube 9, a lower hydraulic cylinder joint 10, an outer sleeve 11, a one-way valve group A12, a leather cup sleeve 13, a one-way valve group B14, and a fixing clamp 19, wherein:

[0032] The upper cylinder joint 1 is connected to the wedge-shaped top cylinder 3 to form a sealed hydraulic oil chamber;

[0033] The upper center tube 2 is sleeved inside the upper cylinder joint 1, and the lower end is connected to the upper part 5 of the center tube;

[0034] The upper part 5 of the central tube is connected to the lower part 6 of the central tube;

[0035] The lower part 6 of the central tube is connected to the lower central tube 9;

[0036] The lower cylinder joint 10 is connected to the lower wedge-shaped top cylinder 3 to form a sealed hydraulic oil chamber;

[0037] The lower center tube 9 is sleeved inside the lower cylinder joint 10 .

[0038] As an optional embodiment, the elastic leather cup 7 is formed of a high temperature and high pressure resistant elastic material, including but not limited to fluororubber; the elastic leather cup 7 is in an unfolded state when it is not stressed, and the two elastic leather cups 7 installed opposite to each other are respectively mounted on the upper part 5 of the center tube and the lower part 6 of the center tube; the inner diameter of the leather cup sleeve 13 is smaller than the unfolded outer diameter of the elastic leather cup 7.

[0039] As an optional embodiment, the n upper cava 4 is circumferentially installed on the outside of the upper center tube 2, n>3; the n lower cava 8 is circumferentially installed on the outside of the lower center tube 9, n>3; the outer sleeve 11 is sleeved on the outside of the upper cava 4 and the lower cava 8, and the outer sleeve 11 has hollows corresponding to the upper cava 4 and the lower cava 8; the movement of the upper cava 4 and the lower cava 8 is limited by the upper prism of the outer sleeve 11; the fixed clamp 19 is sleeved on the outside of the upper cava 4 and the lower cava 8, and the fixed clamp 19 can prevent the upper cava 4 and the lower cava 8 from hanging prematurely, and the fixed clamp 19 can collapse automatically under the external expansion force.

[0040] As an optional embodiment, a circumferential one-way valve group A12 is installed on the boss in the middle of the upper center tube 2 to divide the hydraulic oil chamber in the upper cylinder joint 1 into a self-locking cylinder A15 and a self-locking cylinder B16. The one-way valve group A12 limits the hydraulic oil from flowing from the self-locking cylinder A15 to the self-locking cylinder B16.

[0041] As an optional embodiment, a circumferential one-way valve group B14 is installed on the boss in the middle of the lower center tube 9 to divide the hydraulic oil chamber in the lower cylinder joint 10 into a self-locking cylinder C17 and a self-locking cylinder D18. The one-way valve group B14 limits the hydraulic oil from flowing from the self-locking cylinder D18 to the self-locking cylinder C17.

[0042] The working principle of the mechanical-liquid combined leather cup packer in the present invention is as follows:

[0043] When the packer reaches the predetermined position and needs to be seated, the pipe string is lowered, and the upper cylinder joint 1 moves downward, driving the wedge-shaped top cylinder 3, the upper part of the center cylinder 5, and the lower part of the center cylinder 6 to move downward in sequence. At this time, the lower slip 8 expands outward under the action of the wedge, and the expansion force breaks the fixed clamp 19 wrapped outside, and the lower slip 8 completes the seat; at the same time, the one-way valve group B14 moves downward inside the cylinder, and the hydraulic oil is transferred from the self-locking cylinder D18 to the self-locking cylinder C17, and the lower part completes the self-locking; at the same time, the elastic leather cup 7 sent down moves with the lower part of the center cylinder 6 and separates from the leather cup sleeve 13 wrapped outside, and unfolds under its own elastic action to complete the packing;

[0044] The tubing string is further lowered, and the upper cava 4 expands outwards under the wedge action of the wedge-shaped top tube 3. The expansion force breaks the fixed clamp 19 wrapped outside, and the upper cava 4 completes the seating; at the same time, the one-way valve group A12 moves upward inside the cylinder relative to the upper cylinder joint 1, and the hydraulic oil is transferred from the self-locking cylinder A15 to the self-locking cylinder B16, and the upper part completes the self-locking; at the same time, the leather cup sleeve 13 moves downward with the upper part 5 of the center tube to release the internal elastic leather cup 7, and the elastic leather cup 7 unfolds under its own elastic action to complete the sealing.

[0045] The above shows and describes the basic principles and main features of this patent and the advantages of this patent. Those skilled in the art should understand that this patent is not limited to the above embodiments. The above embodiments and descriptions are only for explaining the principles of this patent. Without departing from the spirit and scope of this patent, this patent will have various changes and improvements, which fall within the scope of this patent. The scope of protection claimed by this patent is defined by the attached claims and their equivalents.

Claims

1. A mechanical-liquid combined leather cup packer, characterized in that: The invention comprises an upper cylinder joint (1), an upper center tube (2), a wedge-shaped top tube (3), an upper slip (4), an upper part of a center tube (5), a lower part of a center tube (6), an elastic leather cup (7), a lower slip (8), a lower center tube (9), a lower cylinder joint (10), an outer sleeve (11), a one-way valve group A (12), a leather cup sleeve (13), a one-way valve group B (14), and a fixing clamp (19), wherein: The upper cylinder joint (1) is connected to the wedge-shaped top cylinder (3); The upper center tube (2) is sleeved inside the upper cylinder joint (1), and the lower end is connected to the upper part (5) of the center tube; The upper part (5) of the central tube is connected to the lower part (6) of the central tube; The lower part (6) of the central tube is connected to the lower central tube (9); The lower cylinder joint (10) is connected to the lower wedge-shaped top cylinder (3); The lower center tube (9) is sleeved inside the lower cylinder joint (10).

2. The mechanical-hydraulic combined cup packer according to claim 1, characterized in that: The elastic leather cup (7) is formed of a high temperature and high pressure resistant elastic material, including but not limited to fluororubber; the elastic leather cup (7) is in an unfolded state when it is not stressed, and the two elastic leather cups (7) installed opposite to each other are respectively mounted on the upper part (5) and the lower part (6) of the center tube; the inner diameter of the leather cup sleeve (13) is smaller than the unfolded outer diameter of the elastic leather cup (7).

3. The mechanical-hydraulic combined cup packer according to claim 1, characterized in that: The n upper slips (4) are circumferentially mounted on the outside of the upper center tube (2), n>3; the n lower slips (8) are circumferentially mounted on the outside of the lower center tube (9), n>3; the outer sleeve (11) is sleeved on the outside of the upper slips (4) and the lower slips (8), and the outer sleeve (11) is provided with hollows corresponding to the upper slips (4) and the lower slips (8); the movement of the upper slips (4) and the lower slips (8) is restricted by the upper prism of the outer sleeve (11); the fixing clamp (19) is sleeved on the outside of the upper slips (4) and the lower slips (8).

4. The mechanical-hydraulic combined cup packer according to claim 1, characterized in that: A circumferential one-way valve group A (12) is installed on the boss in the middle of the upper central tube (2), and the hydraulic oil chamber in the upper cylinder joint (1) is divided into a self-locking cylinder A (15) and a self-locking cylinder B (16).

5. The mechanical-hydraulic combined cup packer according to claim 1, characterized in that: A circumferential one-way valve group B (14) is installed on the boss in the middle of the lower central tube (9), and the hydraulic oil chamber in the lower cylinder joint (10) is divided into a self-locking cylinder C (17) and a self-locking cylinder D (18).

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