Bidirectional permanent packer capable of bearing high temperature and high pressure

Abstract

The utility model discloses a bidirectional permanent packer bearing high temperature and high pressure, which comprises an upper joint and a third sealing ring, the outer surface of the upper joint is in threaded connection with a first upper slip, the outer surface of the first upper slip is provided with a first slip fixing bolt, and a first slip fixing screw is in threaded connection between the first slip fixing bolt and the first upper slip; two cones are movably connected to the outer surface of the upper connector in a penetrating mode, a plurality of shear screw bodies are jointly connected between the two cones and the upper connector at equal intervals in a threaded penetrating mode, and the side, close to the cones, of the outer surface of the upper connector is sequentially sleeved with a first sealing ring, a first sealing supporting ring, a second sealing supporting ring, a second sealing ring and a fourth sealing ring. The packer is provided with a unique high-temperature and high-pressure sealing structure, deals with higher-temperature well conditions, and adopts a novel sealing combination and a novel two-way slip technology, so that the inner diameter, the two-way pressure bearing capacity and the load resistance capacity of the packer are improved to the greatest extent, and the adaptability of the packer to severe well conditions is enhanced.

Description

Technical Field

[0001] The utility model relates to the technical field of packers for oil and natural gas development, in particular to a bidirectional high-temperature and high-pressure permanent packer. Background Art

[0002] The packer used in oil and gas development is a downhole tool that is generally used to seal the annulus of the oil casing or isolate the target layer, control the injection or production of fluids, and can withstand the pressure difference. It is generally composed of a connecting mechanism, an anchoring mechanism, a sealing mechanism, a setting and locking mechanism. The connecting mechanism is the main part of the packer, usually made of high-strength metal, with sufficient strength and corrosion resistance; the anchoring mechanism and the sealing mechanism are the core components of the packer; the setting and locking mechanisms are necessary components of the packer, which are used to start the isolation and maintain long-term isolation. However, the following problems still exist in the prior art: the existing hydraulic setting permanent packer structure design is difficult to cope with the bidirectional pressure of multi-stage completion and multi-stage fracturing of deep high-temperature and high-pressure oil and gas wells, the high production of ultra-deep gas wells, and re-entry in the later stage of production. The pressure bearing capacity of the recoverable packer cannot be met, which reduces the production efficiency of the oil field. Utility Model Content

[0003] The main purpose of the utility model is to provide a bidirectional high-temperature and high-pressure bearing permanent packer, which can effectively solve the insufficient high-temperature and high-pressure resistance and bidirectional pressure bearing capacity of the existing packers and improve the production efficiency of oil and gas fields.

[0004] In order to achieve the above purpose, the technical solution adopted by the utility model is:

[0005] A two-way high-temperature and high-pressure permanent sealer comprises an upper joint and a third sealing ring, wherein the outer surface of the upper joint is threadedly connected with a first upper slip, the outer surface of the first upper slip is provided with a first slip fixing bolt, the first slip fixing bolt and the first upper slip are commonly threadedly connected with a first slip fixing screw, the outer surface of the upper joint away from the first upper slip is sleeved with a second lower slip, two cones are movably interlaced and connected with the outer surface of the upper joint, a number of shear screw bodies are commonly threadedly interlaced and connected at equal distances between the two cones and the upper joint, the outer surface of the upper joint close to the cone is respectively sleeved with a first sealing ring, a first sealing support ring, a second sealing support ring, a second sealing ring and a fourth sealing ring, the third sealing ring is located between the two fourth sealing rings, a slip push cylinder is commonly threadedly connected between the second lower slip and the upper joint, a second slip fixing bolt is provided on the outer surface of the second lower slip, and a second slip fixing screw is commonly threadedly connected between the second slip fixing bolt and the second lower slip.

[0006] The upper joint has an inclined surface that contacts the first upper cava, a groove that matches the shear screw body, and a serrated thread to prevent retreat. The cone, the first sealing ring, the first sealing support ring, the second sealing support ring, the second sealing ring, the third sealing ring and the fourth sealing ring form a sealing mechanism. The second lower cava is installed in the threaded groove of the cava push cylinder body and is fixed by the second cava fixing bolt and the second cava fixing screw to prevent opening.

[0007] Preferably, the upper joint and the cava push cylinder are meshed and connected with an inner cava, the outer surface of the inner cava is threaded with a number of anti-rotation screws equidistantly connected, the outer surface of the upper joint and the cava push cylinder are movably and interspersed with a connecting sleeve, the connecting sleeve and the cava push cylinder are interspersed with a number of positioning screws equidistantly connected, the outer surface of the other end of the upper joint is sleeved with a core shaft, and the outer surface of the other end of the core shaft is sleeved with a lower joint.

[0008] The connecting sleeve and the slip push cylinder are fixed together by means of positioning screws.

[0009] Preferably, a piston body is installed in the lower joint, and a plurality of sealing shear screws are threadedly connected between the lower joint and the piston body. The outer surface of the piston body away from the lower joint is threadedly connected to a piston cylinder, and the inner surface of the lower joint is threadedly connected to a core shaft.

[0010] The lower joint and the piston body are fixed by the setting shear screw.

[0011] Preferably, two second sealing rings and two second sealing retaining rings are installed in the piston cylinder, and the second sealing rings and the second sealing retaining rings are both in close contact with the outer surface of the upper joint.

[0012] The second sealing ring and the second sealing retaining ring are tightly attached to the outer surface of the upper joint to form a seal, thereby improving the sealing effect.

[0013] Preferably, two first sealing rings and two first sealing retaining rings are installed outside the core shaft, and the first sealing rings and the first sealing retaining rings are both in close contact with the inner surface of the piston cylinder.

[0014] The first sealing ring and the first sealing retaining ring are both tightly attached to the inner surface of the piston cylinder to form a seal, thereby improving the sealing effect.

[0015] Preferably, two third sealing rings and two third sealing retaining rings are installed in the piston body, and the third sealing rings and the third sealing retaining rings are both in close contact with the outer surface of the core shaft.

[0016] The third sealing ring and the third sealing retaining ring are tightly attached to the outer surface of the core shaft to form a seal, thereby improving the sealing effect.

[0017] Preferably, two fourth sealing rings and two fourth sealing retaining rings are installed on the outer surface of the piston body, and the outer surfaces of the fourth sealing ring and the two fourth sealing retaining rings are in close contact with the inner wall of the lower joint.

[0018] The fourth sealing ring and the two fourth sealing retaining rings are tightly attached to the inner wall of the lower joint to form a seal, thereby improving the sealing effect.

[0019] Preferably, the inner walls of the first sealing ring, the second sealing ring, the third sealing ring and the fourth sealing ring are in contact with the outer wall of the upper joint and partially achieve sliding sealing.

[0020] By providing the first sealing ring, the second sealing ring, the third sealing ring and the fourth sealing ring, the sealing effect of the device during operation is improved.

[0021] Preferably, the piston cylinder comprises a smooth sealing inner surface, a sealing ring mounting groove and a thread for connection.

[0022] This facilitates the installation of the second sealing ring and the two second sealing retaining rings.

[0023] Preferably, one end of the two cones is respectively inserted between the upper joint and the first upper slip and between the upper joint and the second lower slip.

[0024] Compared with the prior art, the utility model has the following beneficial effects:

[0025] 1. The utility model adopts a new sealing combination and a new bidirectional slip technology, which not only maximizes the inner diameter, bidirectional pressure bearing and load resistance of the packer, thereby enhancing the adaptability of the product to severe well conditions. Compared with previous small inner diameter products, the large inner diameter provided by it can not only effectively increase the production of single well oil and gas wells and ensure the smooth progress of subsequent wellbore operations, but also increase the operating space for the subsequent research and development of supporting products for oil and gas wells. It not only effectively improves the production efficiency of the oil field and reduces the operation risks, but also adds significant economic benefits to the development of oil and gas fields.

[0026] 2. In the utility model, when the pressure is greater than the breaking value of the shear screw body, the lower cone will push the first sealing support ring and the second sealing support ring, the first sealing ring, the second sealing ring, the third sealing ring and the fourth sealing ring to move to the left and compress. When the pressure is greater than the breaking value of the shear screw body on the upper cone, the upper cone will squeeze the first upper slip, and the first upper slip will open outward along the oblique cone surface of the upper cone and the oblique cone surface at the contact position with the upper joint until it contacts the inner wall of the casing. When the pressure reaches the breaking value of the second slip fixing screw, the second lower slip will also open along the oblique cone surface of the lower cone until it contacts the casing. The casing is in contact with the pipe, and the liquid pressure inside the upper joint and the core shaft continues to increase until the first sealing support ring and the second sealing support ring and the first sealing ring, the second sealing ring, the third sealing ring and the fourth sealing ring are fully compressed. Finally, the first upper slip and the second lower slip tightly bite the casing under the bidirectional support of the cone, the oblique cone surface of the upper joint and the oblique cone surface of the slip push tube, while maintaining the first sealing support ring, the second sealing support ring and the first sealing ring, the second sealing ring, the third sealing ring and the fourth sealing ring in a fully compressed state, so that the sealing performance of the entire device is relatively high. Its unique high-temperature and high-pressure sealing structure can cope with higher-temperature well conditions. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is the overall structure diagram of the utility model;

[0028] Figure 2 For this utility model Figure 1 A partial enlarged view of point A;

[0029] Figure 3 For this utility model Figure 1 A partial enlarged view of point B in the middle;

[0030] Figure 4 For this utility model Figure 1 A partial enlarged view of point C in the middle;

[0031] Figure 5 For this utility model Figure 1 A partial enlarged view of point D in the middle;

[0032] Figure 6 For this utility model Figure 1 A partial enlarged view of point E in the middle;

[0033] Figure 7 For this utility model Figure 1 A partial enlarged view of point F in the middle.

[0034] In the figure: 1, upper joint; 2, first upper slip; 3, second lower slip; 4, cone; 5, first sealing ring; 6, inner slip; 7, first sealing support ring; 8, second sealing support ring; 9, second sealing ring; 10, third sealing ring; 11, fourth sealing ring; 12, slip push cylinder; 13, connecting sleeve; 14, core shaft; 15, lower joint; 16, piston body; 17, piston cylinder; 18, first sealing ring; 19, second sealing ring; 20, first sealing retainer ring; 21, second sealing retainer ring; 22, first slip fixing bolt; 23, second slip fixing bolt; 24, first slip fixing screw; 25, second slip fixing screw; 26, shear screw body; 27, setting shear screw; 28, anti-rotation screw; 29, positioning screw; 30, third sealing ring; 31, third sealing retainer ring; 32, fourth sealing ring; 33, fourth sealing retainer ring. DETAILED DESCRIPTION

[0035] In order to make the technical means, creative features, objectives and effects achieved by the present invention easy to understand, the present invention is further described below in conjunction with specific implementation methods.

[0036] like Figure 1-7 As shown, a bidirectional high-temperature and high-pressure permanent packer comprises an upper joint 1 and a third sealing ring 10. The outer surface of the upper joint 1 is threadedly connected with a first upper slip 2. The upper joint 1 comprises a smooth sealing outer surface and a pressure transmission hole. The outer surface of the first upper slip 2 is provided with a first slip fixing bolt 22. The first slip fixing bolt 22 and the first upper slip 2 are threadedly connected with a first slip fixing screw 24. The outer surface of the upper joint 1 away from the first upper slip 2 is sleeved with a second lower slip 3. Two cones 4 are movably interlaced and connected to the outer surface of the upper joint 1. The two cones 4 and the upper joint 1 are both A number of shear screw bodies 26 are connected by common threads at equal distances. The first sealing ring 5, the first sealing support ring 7, the second sealing support ring 8, the second sealing ring 9 and the fourth sealing ring 11 are sequentially sleeved on the outer surface of the upper joint 1 close to the cone 4. The third sealing ring 10 is located between the two fourth sealing rings 11. A cava push cylinder 12 is commonly threadedly connected between the second lower cava 3 and the upper joint 1. A second cava fixing bolt 23 is arranged on the outer surface of the second lower cava 3. A second cava fixing screw 25 is commonly threadedly connected between the second cava fixing bolt 23 and the second lower cava 3.

[0037] The upper joint 1 and the slip push tube 12 are meshed with an inner slip 6, and the outer surface of the inner slip 6 is threaded with a plurality of anti-rotation screws 28 at equal distances. The outer surface of the upper joint 1 and the slip push tube 12 are movably interlaced with a connecting sleeve 13, and the connecting sleeve 13 and the slip push tube 12 are interlaced with a plurality of positioning screws 29 at equal distances. The outer surface of the other end of the upper joint 1 is sleeved with a core shaft 14, and the outer surface of the other end of the core shaft 14 is sleeved with a lower joint 15; a piston body 16 is installed in the lower joint 15, and the lower joint 15 is connected to the outer surface of the other end of the upper joint 1. The piston bodies 16 are threadedly connected with a plurality of setting shear screws 27. The piston body 16 includes a sealing groove, a pressure balance hole, and a groove for installing the setting shear screws 27 to ensure the installation of the sealing ring. The outer surface of the piston body 16 away from the lower joint 15 is threadedly connected with a piston cylinder 17. The inner surface of the lower joint 15 is threadedly connected with a core shaft 14. The core shaft 14 includes a smooth sealing surface and a pressure transmission hole, as well as a threaded hole for installing the setting shear screws 27. Two second sealing rings 19 and Two second sealing rings 21, the second sealing ring 19 and the second sealing ring 21 are both in close contact with the outer surface of the upper joint 1; two first sealing rings 18 and two first sealing rings 20 are installed outside the core shaft 14, and the first sealing rings 18 and the first sealing rings 20 are both in close contact with the inner surface of the piston cylinder 17; two third sealing rings 30 and two third sealing rings 31 are installed inside the piston body 16, and the third sealing rings 30 and the third sealing rings 31 are both in close contact with the outer surface of the core shaft 14; two fourth sealing rings are installed on the outer surface of the piston body 16 The outer surfaces of the fourth sealing ring 32 and the two fourth sealing rings 33 are in close contact with the inner wall of the lower joint 15; the inner walls of the first sealing ring 5, the second sealing ring 9, the third sealing ring 10 and the fourth sealing ring 11 are in contact with the outer wall of the upper joint 1 and partially realize sliding sealing; the piston cylinder 17 includes a smooth sealing inner surface, a sealing ring installation groove and a thread for connection; one end of the two cones 4 is respectively inserted between the upper joint 1 and the first upper slip 2 and between the upper joint 1 and the second lower slip 3.

[0038] It should be noted that the utility model is a bidirectional high-temperature and high-pressure permanent packer. After the device is assembled, it reaches a state of being set and waiting for activation. The upper joint 1 and its pressure transmission hole, the first sealing ring 18 and the second sealing ring 19 installed in the sealing ring groove inside the piston cylinder 17, the first sealing retaining ring 20 and the second sealing retaining ring 21 installed in the sealing ring groove on the outer surface of the core shaft 14, the piston cylinder 17, and the core shaft 14 form a seal and a first-stage setting piston area. The core shaft 14 and its pressure transmission hole, the piston body 16, the third sealing ring 30 and the fourth sealing ring 32 installed in the sealing ring groove on the inner surface of the piston body 16, and the first sealing ring 20 and the second sealing ring 21 installed in the sealing ring groove on the outer surface of the piston body 16 are sealed. A second-stage sealing piston area is formed between the third sealing retainer ring 31 and the fourth sealing retainer ring 33 and the lower joint 15; the two-stage sealing areas are connected to the internal area of ​​the packer through the pressure transmission hole. The sealing process of the packer can be activated by applying hydraulic pressure to the inside of the packer. The packer is lowered into a casing suitable for sealing according to the normal lowering procedure and smoothly lowered to the designated position in the well. After completing the relevant pre-activation procedures, hydraulic pressure can be applied to the inside of the packer to activate the sealing. First, liquid pressure is applied inside the upper joint 1 and the core shaft 14, and the hydraulic pressure is transmitted to the piston cavity through the pressure transmission hole on the upper joint 1. When the pressure reaches the breaking pressure of the sealing shear screw 27, the piston cylinder 17. The piston body 16 pushes the connecting sleeve 13, the slip push cylinder 12, the second lower slip 3, the inner slip 6, and the lower cone 4 to move to the left. When the pressure is greater than the breaking value of the shear screw body 26, the lower cone 4 will push the first sealing support ring 7, the second sealing support ring 8, the first sealing ring 5, the second sealing ring 9, the third sealing ring 10 and the fourth sealing ring 11 to move to the left and compress. When the pressure is greater than the breaking value of the shear screw body 26 on the upper cone 4, the upper cone 4 will squeeze the first upper slip 2. The first upper slip 2 will open outward along the oblique cone surface direction of the upper cone 4 and the oblique cone surface at the contact position with the upper joint 1 until it contacts the inner wall of the casing. When the pressure reaches the second slip After the breaking value of the fixing screw 25 is reached, the second lower slip 3 will also open along the oblique cone surface of the lower cone 4 until it contacts the casing, and the internal liquid pressure of the upper joint 1 and the core shaft 14 will continue to increase until the first sealing support ring 7 and the second sealing support ring 8 and the first sealing ring 5, the second sealing ring 9, the third sealing ring 10 and the fourth sealing ring 11 are completely compressed. Finally, the first upper slip 2 and the second lower slip 3 tightly bite the casing under the bidirectional support of the cone 4, the oblique cone surface of the upper joint 1 and the oblique cone surface of the slip push tube 12, while maintaining the first sealing support ring 7, the second sealing support ring 8 and the first sealing ring 5, the second sealing ring 9, the third sealing ring 10 and the fourth sealing ring 11 in a fully compressed state;A seal is formed between the upper joint 1, the piston cylinder 17 and the core shaft 14, and a second-stage setting piston area is formed between the core shaft 14 and the lower joint 15. The two-stage setting areas are connected to the internal area of ​​the packer through the upper joint 1. It is only necessary to apply hydraulic pressure to the inside of the packer to activate the setting process of the packer. The double piston design is more conducive to the setting of the packer; the meshing structure of the inner slip 6 itself, the slip push cylinder 12 and the upper joint 1 only allows one-way sliding to the left. During the sliding to the left, the special structure of the inner slip 6 can be opened in a limited space, and at the same time combined with the two, and fixed by screws to prevent it from rotating. The unique anti-retraction design of the inner slip 6 provides double protection for maintaining the setting state of the packer. ;

[0039] The above shows and describes the basic principle and main features of the utility model and the advantages of the utility model. Those skilled in the art should understand that the utility model is not limited by the above embodiments. The above embodiments and descriptions are only for explaining the principle of the utility model. Without departing from the spirit and scope of the utility model, the utility model may have various changes and improvements, which fall within the scope of the utility model to be protected. The scope of protection claimed by the utility model is defined by the attached claims and their equivalents.

Claims

1. A bidirectional high-temperature and high-pressure permanent packer, comprising an upper joint (1) and a third sealing ring (10), characterized in that: The outer surface of the upper joint (1) is threadedly connected to a first upper slip (2), the outer surface of the first upper slip (2) is provided with a first slip fixing bolt (22), the first slip fixing bolt (22) and the first upper slip (2) are threadedly connected to a first slip fixing screw (24), the outer surface of the upper joint (1) away from the first upper slip (2) is sleeved with a second lower slip (3), the outer surface of the upper joint (1) is movably interlaced with two cones (4), a plurality of shear screw bodies (26) are threadedly interlaced with the two cones (4) and the upper joint (1) at equal distances, the upper A first sealing ring (5), a first sealing support ring (7), a second sealing support ring (8), a second sealing ring (9) and a fourth sealing ring (11) are respectively sleeved in sequence on the side of the outer surface of the joint (1) close to the cone (4); the third sealing ring (10) is located between the two fourth sealing rings (11); a cava push cylinder (12) is threadedly connected between the second lower cava (3) and the upper joint (1); a second cava fixing bolt (23) is provided on the outer surface of the second lower cava (3); a second cava fixing screw (25) is threadedly connected between the second cava fixing bolt (23) and the second lower cava (3).

2. A bidirectional high temperature and high pressure permanent packer according to claim 1, characterized in that: The upper joint (1) and the cava push tube (12) are meshedly connected with an inner cava (6), and the outer surface of the inner cava (6) is threadedly connected with a plurality of anti-rotation screws (28) at equal distances. The outer surface of the upper joint (1) and the cava push tube (12) are movably interlaced with a connecting sleeve (13), and a plurality of positioning screws (29) are interlaced with the connecting sleeve (13) and the cava push tube (12) at equal distances. The outer surface of the other end of the upper joint (1) is sleeved with a core shaft (14), and the outer surface of the other end of the core shaft (14) is sleeved with a lower joint (15).

3. A bidirectional high temperature and high pressure permanent packer according to claim 2, characterized in that: A piston body (16) is installed in the lower joint (15); a plurality of sealing shear screws (27) are threadedly connected between the lower joint (15) and the piston body (16); a piston cylinder (17) is threadedly connected to the outer surface of the piston body (16) away from the lower joint (15); and a core shaft (14) is threadedly connected to the inner surface of the lower joint (15).

4. A bidirectional high temperature and high pressure permanent packer according to claim 3, characterized in that: Two second sealing rings (19) and two second sealing retaining rings (21) are installed in the piston cylinder (17), and the second sealing rings (19) and the second sealing retaining rings (21) are both in close contact with the outer surface of the upper joint (1).

5. A bidirectional high temperature and high pressure permanent packer according to claim 3, characterized in that: Two first sealing rings (18) and two first sealing retaining rings (20) are installed outside the core shaft (14), and the first sealing rings (18) and the first sealing retaining rings (20) are both in close contact with the inner surface of the piston cylinder (17).

6. A bidirectional high temperature and high pressure permanent packer according to claim 3, characterized in that: Two third sealing rings (30) and two third sealing retaining rings (31) are installed in the piston body (16), and the third sealing rings (30) and the third sealing retaining rings (31) are both in close contact with the outer surface of the core shaft (14).

7. A bidirectional high temperature and high pressure permanent packer according to claim 3, characterized in that: Two fourth sealing rings (32) and two fourth sealing retaining rings (33) are installed on the outer surface of the piston body (16), and the outer surfaces of the fourth sealing ring (32) and the two fourth sealing retaining rings (33) are tightly attached to the inner wall of the lower joint (15).

8. The bidirectional high temperature and high pressure permanent packer according to claim 1, characterized in that: The inner walls of the first sealing ring (5), the second sealing ring (9), the third sealing ring (10) and the fourth sealing ring (11) are in contact with the outer wall of the upper joint (1) and partially achieve sliding sealing.

9. The bidirectional high temperature and high pressure permanent packer according to claim 5, characterized in that: The piston cylinder (17) comprises a smooth sealing inner surface, a sealing ring mounting groove and a thread for connection.

10. The bidirectional high temperature and high pressure permanent packer according to claim 1, characterized in that: One end of the two cones (4) is respectively inserted between the upper joint (1) and the first upper slip (2) and between the upper joint (1) and the second lower slip (3).

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