Anchoring device

Abstract

The utility model provides an anchoring device. The anchoring device comprises a barrel module, a locking ring, a mandrel and a slip, the cylinder module comprises an upper joint, an outer cylinder, a connecting cylinder, an eccentric sleeve and a lower joint; the two sides of the connecting cylinder are in threaded connection with the upper connector and the outer cylinder correspondingly, and the side, away from the connecting cylinder, of the outer cylinder is in threaded connection with the lower connector. The barrel module is of a barrel-shaped structure with an opening in one end of an upper connector; a hollow core shaft is sleeved in a barrel body formed by the connecting barrel and the outer barrel, and when the outer barrel is in a working state, the core shaft moves in a direction far away from the upper joint to extrude the slip to extend out of the first slip through hole; a first slip through hole is formed in the position, close to one side of the lower connector, of the cylinder wall, a solid slip is embedded in the first slip through hole in a sliding mode, the structure is simple, the operation efficiency is high, and the action of the slip can be controlled only by increasing the displacement of a slurry pump.

Description

Technical Field

[0001] The utility model relates to the technical field of oil well downhole equipment, in particular to an anchoring device. Background Art

[0002] During the process of oil exploitation, corresponding pipe strings need to be lowered according to different operation requirements. Some pipe strings need to be anchored in the wellbore to play a supporting role, and the anchoring device is an indispensable part. At present, there are many types of such anchoring devices, which realize different functions. In the operations of casing well window cutting and open hole sidetracking, the anchoring device bears axial and circumferential loads, and its reliability and application range are particularly important. The existing anchoring devices cannot be applied to both casing wells and open holes at the same time, and the structure is complex, which affects the operation efficiency and operation cost. Therefore, it is particularly important to develop a simple anchoring device with a wide application range. Content of the Utility Model

[0003] In order to solve the problems in the background art, the utility model provides an anchoring device with a wide anchoring range and stable and reliable anchoring.

[0004] For this purpose, the utility model adopts the following technical solutions:

[0005] An anchoring device, comprising a cylinder module, a locking ring, a mandrel and slips, wherein;

[0006] The cylinder module includes an upper sub, an outer cylinder, a connecting cylinder, an eccentric sleeve and a lower sub;

[0007] The two sides of the connecting cylinder are respectively threadedly connected to the upper sub and the outer cylinder, and the side of the outer cylinder away from the connecting cylinder is threadedly connected to the lower sub; the cylinder module is a cylindrical structure with one end of the upper sub open;

[0008] The hollow mandrel is sleeved in the cylinder formed by the connecting cylinder and the outer cylinder, and the side of the mandrel away from the upper sub is a bevel;

[0009] A first slips through-hole is opened on the cylinder wall near the side of the outer cylinder close to the lower sub, and the solid slips are slidably embedded in the first slips through-hole, and the slips are in contact with the bevel of the mandrel; in the working state, the mandrel moves in the direction away from the upper sub, squeezing the slips to extend out of the first slips through-hole.

[0010] Preferably, first sealing rings are arranged on both sides of the connecting cylinder, and the first sealing rings are used for sealing at the threaded connections between the connecting cylinder and the upper sub and the outer cylinder.

[0011] Preferably, a locking ring is arranged between the outer wall of the mandrel and the inner wall of the outer cylinder, and the locking ring is used to keep the mandrel from moving in the direction of the upper sub.

[0012] Preferably, a second sealing ring is provided between the outer wall of the mandrel near the upper sub and the inner wall of the outer cylinder, and the second sealing ring is used to stabilize the pressure inside the mandrel under working conditions.

[0013] Preferably, a slip tooth is further provided on the side where the slip extends out of the first slip through hole, and is used to increase the clamping force between the slip and the wellbore wall.

[0014] Preferably, a through first pin hole is provided on the outer cylinder, and a pin slot is provided on the outer wall of the mandrel; the position of the pin slot corresponds to that of the first pin hole; a first shear pin is provided to pass through the first pin hole and insert into the pin slot, and the first shear pin is used to keep the mandrel and the outer cylinder relatively fixed.

[0015] Preferably, a second shear pin is provided at the inclined surface of the slip and the mandrel, and the second shear pin is used to keep the slip and the mandrel relatively fixed.

[0016] Preferably, the slip is provided with a through third pin hole, and a second pin hole is provided on the inclined surface of the mandrel, and the position of the third pin hole is adapted to that of the second pin hole; the second shear pin passes through the third pin hole and inserts into the second pin hole.

[0017] Preferably, a second slip through hole is provided on the outer cylinder at a position symmetrical to the central axis of the outer cylinder; an eccentric sleeve is fixedly connected in the second slip through hole, and the eccentric sleeve protrudes from the outer wall of the outer cylinder.

[0018] Preferably, a slip tooth is provided on the side where the eccentric sleeve protrudes from the outer wall of the outer cylinder.

[0019] Compared with the prior art, the present utility model has the following beneficial effects:

[0020] 1. The structure of the present utility model is simple and the operation efficiency is high. Only by increasing the displacement of the mud pump can the action of the slip be controlled.

[0021] 2. The structure of the slip of the present utility model can achieve more reliable anchoring performance and anchoring range, and is more suitable for different working environments.

[0022] 3. The eccentric sleeve of the present utility model ensures that the pipe string is more easily centered, facilitating subsequent operations. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 is the overall sectional view of the present utility model;

[0024] Figure 2 is the three-dimensional sectional view of the present utility model;

[0025] Figure 3 A three-dimensional schematic diagram of the outer cylinder of the present utility model;

[0026] Figure 4 A three-dimensional schematic diagram of the mandrel of the present utility model;

[0027] Figure 5 A three-dimensional schematic diagram of the whole of the present utility model;

[0028] Figure 6 A three-dimensional schematic diagram of the connecting cylinder of the present utility model.

[0029] In the figure: 1. Upper joint, 2. Outer cylinder, 3. Connecting cylinder, 4. Mandrel, 5. Lock ring, 6. Slip, 7. Eccentric sleeve, 8. Lower joint, 9. First slip through hole, 10. Second slip through hole, 11. First shear pin, 12. Second shear pin, 13. First pin hole, 14. Second pin hole, 15. Third pin hole, 16. Pin slot. Specific embodiments

[0030] The technical solutions of the present utility model will be further described in detail below in conjunction with the accompanying drawings and embodiments.

[0031] As Figure 1 , Figure 2 and Figure 6 shown, the anchoring device of the present utility model includes: a cylinder module, a lock ring 5, a mandrel 4 and a slip 6; the cylinder module includes an upper joint 1, an outer cylinder 2, a connecting cylinder 3, an eccentric sleeve 7 and a lower joint 8.

[0032] The two sides of the connecting cylinder 3 are respectively threadedly connected to the upper joint 1 and the outer cylinder 2, and the side of the outer cylinder 2 away from the connecting cylinder 3 is threadedly connected to the lower joint 8; the whole cylinder module is a cylindrical structure with one end of the upper joint 1 open; O-ring seals are provided on both sides of the connecting cylinder 3 to keep the internal pressure of the present utility model stable.

[0033] Two slip through holes are provided on the cylinder wall near the side of the outer cylinder 2 close to the lower joint 8, and the two slip through holes are symmetric about the central axis of the outer cylinder 2. A through first pin hole 13 is provided on the side wall of the middle part of the outer cylinder 2; the two slip through holes are respectively the first slip through hole 9 and the second slip through hole 10.

[0034] As Figure 3 and Figure 4As shown, a hollow mandrel 4 is sleeved inside a cylinder formed by a connecting cylinder 3 and an outer cylinder 2. A locking ring 5 is arranged between the outer wall of the mandrel 4 and the inner wall of the outer cylinder 2, and the locking ring 5 is used to prevent the mandrel 4 from moving towards the upper joint 1. An O-ring is arranged between the outer wall of the mandrel 4 near the upper joint 1 and the inner wall of the outer cylinder 2 to keep the pressure inside the mandrel 4 stable. One end of the mandrel 4 away from the upper joint 1 is a slope, and a second pin hole 14 is arranged thereon. A pin slot 16 is formed in the outer wall of the middle part of the mandrel 4, and the position of the pin slot 16 corresponds to the position of the first pin hole 13. A first shear pin 11 passes through the first pin hole 13 and is inserted into the pin slot 16 to fix the relative position of the mandrel 4 and the outer cylinder 2.

[0035] As Figure 5 shown, a slip 6 is slidably embedded in a first slip through hole 9; the slip 6 is a solid cylinder adapted to the area of the first slip through hole 9. One side of the slip 6 near the upper joint 1 is a slope and fits with the slope of the mandrel 4. When the mandrel 4 is pressed down, the slip 6 is pushed out of the first slip through hole 9, so as to achieve anchoring on the wellbore wall. One side of the slip 6 facing the first slip through hole 9 is an anchoring surface, and a number of slip teeth are arranged on the anchoring surface to make the anchoring force greater. A third pin hole 15 also penetrates through the slip 6. One end of the third pin hole 15 is opened on the anchoring surface, and the other end is opened on the slope, and its position corresponds to the position of the second pin hole 14. A second shear pin 12 passes through the third pin hole 15 and is inserted into the second pin hole 14 to relatively fix the mandrel 4 and the slip 6.

[0036] An eccentric sleeve 7 is fixedly arranged in a second slip through hole 10. The anchoring surface of the eccentric sleeve 7 protrudes from the outer wall of the outer cylinder 2, and a number of anchoring teeth are arranged on the anchoring surface of the eccentric sleeve 7. The eccentric sleeve 7 is used to cooperate with the slip 6 to anchor the present utility model on the wellbore wall or the casing.

[0037] The following is the usage method of the present utility model;

[0038] The present utility model can be used for the anchoring operation of downhole oil pipe strings, especially for casing well window opening and open hole sidetracking operations. It is located at the lowest end of the pipe string and is lowered into the well together. After the pipe string is lowered in place, the displacement of the mud pump is increased. When the mud flows into the inner hole of the mandrel 4, a pressure difference is formed, which pushes the mandrel 4 to move downward. The first shear pin 11 and the second shear pin 12 are cut off. The slope of the mandrel 4 pushes the slip 6 to move radially and bite into the casing or the formation. At the same time, the locking ring 5 moves along the inner surface of the outer cylinder 2 together with the mandrel 4. After the pump is stopped, due to the action of the locking ring 5, the mandrel 4 remains stationary and continues to support the slip 6 to maintain the biting state of the slip teeth. After being lowered in place, due to the action of the eccentric sleeve 7, the upper part of the pipe string reaches close to the low side, which is beneficial to subsequent operations.

Claims

1. An anchoring device, characterized in that: It includes a cylinder module, a locking ring (5), a mandrel (4) and slips (6), wherein; The cylinder module includes an upper sub (1), an outer cylinder (2), a connecting cylinder (3), an eccentric sleeve (7) and a lower sub (8); Both sides of the connecting cylinder (3) are threadedly connected to the upper sub (1) and the outer cylinder (2) respectively. The side of the outer cylinder (2) away from the connecting cylinder (3) is threadedly connected to the lower sub (8). The cylinder module is a cylindrical structure with one end of the upper sub (1) open; The hollow mandrel (4) is sleeved in the cylinder formed by the connecting cylinder (3) and the outer cylinder (2). The side of the mandrel (4) away from the upper sub (1) is a bevel; A first slip through-hole (9) is opened on the cylinder wall near the side of the outer cylinder (2) close to the lower sub (8). The solid slips (6) are slidably inserted into the first slip through-hole (9). The slips (6) are in contact with the bevel of the mandrel (4). In the working state, the mandrel (4) moves in the direction away from the upper sub (1), squeezing the slips (6) to extend out of the first slip through-hole (9).

2. The anchoring device according to claim 1, wherein: First sealing rings are arranged on both sides of the connecting cylinder (3). The first sealing rings are used for sealing at the threaded connections between the connecting cylinder (3) and the upper sub (1) and the outer cylinder (2).

3. The anchoring device according to claim 1, characterized in that: A locking ring (5) is arranged between the outer wall of the mandrel (4) and the inner wall of the outer cylinder (2). The locking ring (5) is used to keep the mandrel (4) from moving towards the upper sub (1).

4. The anchoring device according to claim 1, characterized in that: A second sealing ring is arranged between the outer wall of the mandrel (4) near the upper sub (1) and the inner wall of the outer cylinder (2). The second sealing ring is used to stabilize the pressure inside the mandrel (4) in the working state.

5. The anchoring device according to claim 1, wherein: A slip tooth is also arranged on the side where the slips (6) extend out of the first slip through-hole (9), which is used to increase the clamping force between the slips (6) and the wellbore wall.

6. The anchoring device according to claim 1, characterized in that: A through first pin hole (13) is arranged on the outer cylinder (2). A pin slot (16) is arranged on the outer wall of the mandrel (4). The position of the pin slot (16) corresponds to that of the first pin hole (13). A first shear pin (11) is arranged to pass through the first pin hole (13) and insert into the pin slot (16). The first shear pin (11) is used to keep the mandrel (4) and the outer cylinder (2) relatively fixed.

7. The anchoring device according to claim 1, characterized in that: A second shear pin (12) is arranged at the bevel of the slips (6) and the mandrel (4). The second shear pin (12) is used to keep the slips (6) and the mandrel (4) relatively fixed.

8. The anchoring device according to claim 7, characterized in that: The slips (6) are provided with a through third pin hole (15). A second pin hole (14) is arranged on the bevel of the mandrel (4). The position of the third pin hole (15) is adapted to that of the second pin hole (14). The second shear pin (12) passes through the third pin hole (15) and inserts into the second pin hole (14).

9. The anchoring device according to claim 1, characterized in that: The second slip through hole (10) is arranged at a position on the outer cylinder (2) that is symmetrical with respect to the central axis of the outer cylinder (2) relative to the first slip through hole (9); an eccentric sleeve (7) is fixedly connected in the second slip through hole (10), and the eccentric sleeve (7) protrudes from the outer wall of the outer cylinder (2).

10. The anchoring device according to claim 9, characterized in that: Slip teeth are arranged on the side surface of the eccentric sleeve (7) that protrudes from the outer wall of the outer cylinder (2).

Images