Double-packer tubular column and mounting structure thereof

Abstract

The utility model relates to the technical field of oil and gas field equipment, and discloses a double-packer tubular column which comprises a casing pipe, an oil pipe is arranged in the casing pipe, a sliding sleeve capable of plugging water is arranged on the oil pipe, an upper packer and a lower packer are arranged at the positions, located at the two ends of the sliding sleeve capable of plugging water, of the oil pipe respectively, and a setting ball seat is arranged at the bottom of the oil pipe. A setting ball matched with the setting ball seat is further included, a sliding sleeve ball seat and a soluble ball matched with the sliding sleeve ball seat are arranged in the water plugging sliding sleeve, and the sliding sleeve ball seat can be matched with the soluble ball to plug an inner channel of the water plugging sliding sleeve. The utility model further discloses an installation structure of the double-packer tubular column. According to the double-packer tubular column and the mounting structure thereof, two layers can be constructed by one trip of tubular column, and the construction efficiency of one trip of tubular column is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of oil and gas field equipment, and particularly relates to a double-packer string and its installation structure. Background Technique

[0002] During the oilfield development process, with the exploitation and production of the oilfield, the formation pressure of the oilfield gradually decreases, resulting in a decline in the oil recovery rate. In order to maintain the formation pressure and the strong production capacity of the oil well, it is necessary to inject water to supplement the formation pressure. However, for a traditional string, a traditional packer only has the effect of constructing on one gas layer and cannot achieve layered water injection and pressure boosting, which is not convenient to use. Summary of the Invention

[0003] The purpose of the utility model is to address the above-mentioned technical deficiencies and provide a double-packer string and its installation structure, which can construct two layers with one string, improving the construction efficiency of one string.

[0004] To achieve the above purpose, the double-packer string designed by the utility model includes a casing. An oil pipe is arranged inside the casing. A water-blocking sliding sleeve is arranged on the oil pipe. An upper packer and a lower packer are respectively arranged at both ends of the oil pipe located at both ends of the water-blocking sliding sleeve. A setting ball seat is arranged at the bottom of the oil pipe. A setting ball matching with the setting ball seat is also included. A sliding sleeve ball seat and a soluble ball matching with the sliding sleeve ball seat are arranged inside the water-blocking sliding sleeve. The sliding sleeve ball seat can cooperate with the soluble ball to block the internal channel of the water-blocking sliding sleeve.

[0005] Preferably, a ball rod assembly matching with the sliding sleeve ball seat is also included. The sliding sleeve ball seat can cooperate with the ball rod assembly to block the internal channel of the water-blocking sliding sleeve.

[0006] Preferably, the water-blocking sliding sleeve includes an upper joint, an outer cylinder, and a lower joint which are arranged from top to bottom and fixedly connected. The sliding sleeve ball seat is arranged inside the outer cylinder. Shearing screws are arranged between the sliding sleeve ball seat and the outer cylinder. The sliding sleeve ball seat can cooperate with the soluble ball or the ball rod assembly to block the internal channel of the sliding sleeve ball seat. A plurality of through-flow holes penetrating and matching with the sliding sleeve ball seat are arranged on the side wall of the outer cylinder along the circumferential direction.

[0007] Preferably, the sliding sleeve ball seat includes an upper part of the ball seat, a lower part of the ball seat, and a ball seat locking ring. The outer side wall of the upper part of the ball seat cooperates with the through-flow holes to open or block the through-flow holes. Shearing screws are arranged between the outer side wall of the upper part of the ball seat and the outer cylinder. A ball seat locking ring matching with the ball rod assembly is arranged on the inner side wall of the upper part of the ball seat. The lower end of the upper part of the ball seat is fixedly connected to the upper end of the lower part of the ball seat.

[0008] Preferably, a through hole which is wide at the top and narrow at the bottom and matches with the soluble ball is arranged inside the upper part of the ball seat.

[0009] Preferably, a sliding sleeve locking ring that cooperates with the lower part of the ball seat is provided on the inner wall of the outer cylinder. The inner wall of the sliding sleeve locking ring is provided with a notch, and a notch that cooperates with the inner wall of the sliding sleeve locking ring is provided on the outer wall of the lower part of the ball seat.

[0010] Preferably, the rod assembly includes a rod upper joint, a rod sealing ring, and a rod guiding head. The lower end of the rod upper joint is fixedly connected to the upper end of the rod guiding head, and a rod sealing ring for blocking the internal channel of the sliding sleeve ball seat is provided between the rod upper joint and the rod guiding head.

[0011] An installation structure of a double packer string, where the setting ball seat is located in the lower gas layer and the water plugging sliding sleeve is located in the upper gas layer.

[0012] Compared with the prior art, the present invention has the following advantages: It can complete the construction of two layers with one trip of the pipe string, improving the construction efficiency of one trip of the pipe string. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 is a schematic structural diagram of the double packer string of the present invention;

[0014] Figure 2 is Figure 1 a schematic structural diagram of the water plugging sliding sleeve in

[0015] Figure 3 is a schematic structural diagram when the water plugging sliding sleeve is working;

[0016] Figure 4 is a schematic structural diagram of the rod assembly in the present invention.

[0017] The reference numerals of each component in the figure are as follows:

[0018] Casing 1, tubing 2, water plugging sliding sleeve 3, upper packer 4, lower packer 5, setting ball seat 6, sliding sleeve ball seat 7, soluble ball 8, rod assembly 9, upper joint 10, outer cylinder 11, lower joint 12, upper part of the ball seat 13, lower part of the ball seat 14, ball seat locking ring 15, shear screw 16, sliding sleeve locking ring 18, rod upper joint 19, rod sealing ring 20, rod guiding head 21, lower gas layer 23, upper gas layer 24. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0019] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0020] As Figures 1 to 3As shown in the figure, a double packer string includes a casing 1, an oil pipe 2 is arranged inside the casing 1, a water plugging sliding sleeve 3 is arranged on the oil pipe 2, an upper packer 4 and a lower packer 5 are respectively arranged at both ends of the oil pipe 2 located at the water plugging sliding sleeve 3, a setting ball seat 6 is arranged at the bottom of the oil pipe 2, and a setting ball matching with the setting ball seat 6 is also included. A sliding sleeve ball seat 7 and a soluble ball 8 matching with the sliding sleeve ball seat 7 are arranged inside the water plugging sliding sleeve 3. The sliding sleeve ball seat 7 can cooperate with the soluble ball 8 to block the internal channel of the water plugging sliding sleeve 3.

[0021] In the use of this embodiment, first connect the upper packer 4, the lower packer 5 and the water plugging sliding sleeve 3 to the oil pipe 1, and then lower them into the casing 1 along with the oil pipe 1. After reaching the predetermined position, close the wellhead. At this time, the setting ball seat 6 is located in the lower gas layer 23, and the water plugging sliding sleeve 3 is located in the upper gas layer 24.

[0022] Then throw the setting ball matching with the setting ball seat 6 from the wellhead, and use a pump truck to pressurize the upper packer 4 and the lower packer 5 to set the upper packer 4 and the lower packer 5. After they are completely set, continue to pressurize to knock down the setting ball into the bottom of the well. At this time, acidizing or sand fracturing can be carried out on the lower gas layer 23. After the construction of the lower gas layer 23 is completed, throw the soluble ball 8 matching with the water plugging sliding sleeve 3 from the wellhead, and after building pressure, open the water plugging sliding sleeve 3, so that water plugging can be carried out during construction, and thus acidizing or sand fracturing construction can be carried out on the upper gas layer 24. After the construction of the upper gas layer 24 is completed, the soluble ball 9 dissolves, and the lower gas layer 23 and the upper gas layer 24 can be produced jointly, thus realizing the construction of two layers with one string of pipes, and improving the construction efficiency of one string of pipes.

[0023] At the same time, in this embodiment, a ball rod assembly 9 matching with the sliding sleeve ball seat 7 is also included. The sliding sleeve ball seat 7 can cooperate with the ball rod assembly 9 to block the internal channel of the water plugging sliding sleeve 3. During the construction process or in the later stage of construction, the lower gas layer 23 may produce water. Once the gas well produces water, drainage or water plugging operations must be carried out to avoid affecting the production of the upper gas layer 24. At this time, the ball rod assembly 9 matching with the water plugging sliding sleeve 3 can be thrown from the wellhead and locked inside the sliding sleeve ball seat 7 of the water plugging sliding sleeve 3 through pumping. At this time, the water plugging sliding sleeve 3 can block the lower gas layer 23 below, and thus does not affect the production of the upper gas layer 24.

[0024] As Figure 2 and Figure 3 shown, the water plugging sliding sleeve 3 includes an upper joint 10, an outer cylinder 11 and a lower joint 12 which are arranged from top to bottom and fixedly connected. The sliding sleeve ball seat 7 is arranged inside the outer cylinder 11. A shear screw 16 is arranged between the sliding sleeve ball seat 7 and the outer cylinder 11. The sliding sleeve ball seat 7 can cooperate with the soluble ball 8 or the ball rod assembly 9 to block the internal channel of the sliding sleeve ball seat 7. A plurality of through flow holes matching with the sliding sleeve ball seat 7 are arranged on the side wall of the outer cylinder 11 along the circumferential direction.

[0025] The sliding sleeve ball seat 7 includes an upper ball seat 13, a lower ball seat 14, and a ball seat locking ring 15. The outer wall of the upper ball seat 13 cooperates with the flow-through hole to open or block the flow-through hole. A shear screw 16 is provided between the outer wall of the upper ball seat 13 and the outer cylinder 11. The inner wall of the upper ball seat 13 is provided with a ball seat locking ring 15 that cooperates with the ball rod assembly 9. The lower end of the upper ball seat 13 is fixedly connected to the upper end of the lower ball seat 14. A through hole that is wider at the top and narrower at the bottom and that cooperates with the soluble ball 8 is provided inside the upper ball seat 13.

[0026] Meanwhile, a sliding sleeve locking ring 18 that cooperates with the lower ball seat 14 is provided on the inner wall of the outer cylinder 11. The inner wall of the sliding sleeve locking ring 18 is provided with a notch. The notch design can be compressed and opened. A notch that cooperates with the inner wall of the sliding sleeve locking ring 18 is provided on the outer wall of the lower ball seat 14, so that the lower ball seat 14 can be locked with the sliding sleeve locking ring 18.

[0027] As Figure 4 shown, in this embodiment, the ball rod assembly 9 includes a ball rod upper joint 19, a ball rod sealing ring 20, and a ball rod guiding head 21. The lower end of the ball rod upper joint 19 is fixedly connected to the upper end of the ball rod guiding head 21. A ball rod sealing ring 20 for blocking the internal channel of the sliding sleeve ball seat 7 is provided between the ball rod upper joint 19 and the ball rod guiding head 21. By providing serrated threads on the inner wall of the ball seat locking ring 15, and by providing serrated threads on one side of the outer wall of the ball rod guiding head 21 that cooperate with the inner wall of the ball seat locking ring 15, the ball seat locking ring 15 can be locked with the ball rod guiding head 21, so that the ball rod assembly 9 cannot be retracted and is positioned and sealed in this state.

[0028] Here, it should be noted that the description of the above technical solutions is exemplary. This specification can be embodied in different forms and should not be construed as limited to the technical solutions described herein. On the contrary, providing these descriptions will make the disclosure of the present utility model thorough and complete, and will fully convey the scope disclosed in this specification to those skilled in the art. In addition, the technical solutions of the present utility model are only limited by the scope of the claims.

[0029] The examples used to describe various aspects of this specification and the claims are merely examples, and thus, this specification and the claims are not limited to the details shown. In the above description, when the detailed description of related known functions or configurations is determined to unnecessarily obscure the key points of this specification and the claims, the detailed description will be omitted.

[0030] Finally, it should be noted that the above content is a further detailed description of the utility model in combination with specific implementation manners. It cannot be considered that the specific implementation of the utility model is only limited to these descriptions. For those of ordinary skill in the technical field to which the utility model belongs, any simple substitution made without departing from the concept of the utility model should be regarded as belonging to the protection scope of the present utility model. The above embodiments are only relatively representative examples of the present utility model. Obviously, the present utility model is not limited to the above embodiments and there can be many variations. Any simple modification, equivalent change and modification made to the above embodiments based on the technical essence of the present utility model should be regarded as belonging to the protection scope of the present utility model.

Claims

1. A double packer string, comprising a casing (1), characterized in that: An oil pipe (2) is arranged in the casing (1), and a water-blocking sliding sleeve (3) is arranged on the oil pipe (2). An upper packer (4) and a lower packer (5) are respectively arranged at two ends of the oil pipe (2) located on the water-blocking sliding sleeve (3). A sealing ball seat (6) is arranged at the bottom of the oil pipe (2), and also includes a sealing ball matched with the sealing ball seat (6). A sliding sleeve ball seat (7) and a soluble ball (8) matched with the sliding sleeve (3) are arranged in the water-blocking sliding sleeve (3). The sliding sleeve ball seat (7) can cooperate with the soluble ball (8) to block the internal channel of the water-blocking sliding sleeve (3).

2. The double packer string according to claim 1, characterized in that: It also comprises a ball rod assembly (9) matched with the sliding sleeve ball seat (7); the sliding sleeve ball seat (7) can be matched with the ball rod assembly (9) to block the internal passage of the water-blocking sliding sleeve (3).

3. The double packer string according to claim 1, characterized in that: The water-blocking sliding sleeve (3) comprises an upper joint (10), an outer tube (11) and a lower joint (12) which are arranged and fixedly connected from top to bottom, the sliding sleeve ball seat (7) is arranged in the outer tube (11), a shear screw (16) is provided between the sliding sleeve ball seat (7) and the outer tube (11), the sliding sleeve ball seat (7) can cooperate with a soluble ball (8) or a ball rod assembly (9) to block the internal channel of the sliding sleeve ball seat (7), and the side wall of the outer tube (11) is provided with a plurality of through-flow holes cooperating with the sliding sleeve ball seat (7) along the circumferential direction.

4. The double packer string according to claim 3, characterized in that: The sliding sleeve ball seat (7) comprises a ball seat upper part (13), a ball seat lower part (14) and a ball seat locking ring (15); the outer wall of the ball seat upper part (13) cooperates with the flow hole to open or block the flow hole; a shear screw (16) is provided between the outer wall of the ball seat upper part (13) and the outer tube (11); the inner wall of the ball seat upper part (13) is provided with a ball seat locking ring (15) that cooperates with the ball rod assembly (9); the lower end of the ball seat upper part (13) is fixedly connected to the upper end of the ball seat lower part (14).

5. The double packer string according to claim 3, characterized in that: A through hole which is wide at the top and narrow at the bottom and matches the soluble ball (8) is provided inside the upper part (13) of the ball seat.

6. The double packer string according to claim 3, characterized in that: The inner wall of the outer cylinder (11) is provided with a sliding lock ring (18) which matches with the lower part of the ball seat (14); the inner wall of the sliding lock ring (18) is provided with a cutout; and the outer wall of the lower part of the ball seat (14) is provided with a cutout which matches with the inner wall of the sliding lock ring (18).

7. The double packer string according to claim 2 or 3, characterized in that: The club assembly (9) comprises a club upper joint (19), a club sealing ring (20) and a club guide head (21); the lower end of the club upper joint (19) is fixedly connected to the upper end of the club guide head (21); and a club sealing ring (20) is provided between the club upper joint (19) and the club guide head (21) for sealing the internal passage of the sliding sleeve ball seat (7).

8. An installation structure for a dual packer string as claimed in claim 1, characterized in that: The sealing ball seat (6) is located in the lower gas layer (23), and the water-blocking sliding sleeve (3) is located in the upper gas layer (24).

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