Toe end well cementation fracturing sliding sleeve capable of testing pressure

Abstract

The utility model discloses a toe end well cementation fracturing sliding sleeve capable of testing pressure, which relates to the technical field of pressure sliding sleeves and comprises a lower joint and a middle joint, the top of the middle joint is connected with an outer soft sleeve, the top of the outer soft sleeve is connected with an upper joint, the outer soft sleeve is sleeved with a first fixing ring and a second fixing ring respectively, and an inner ring of the outer soft sleeve is connected with a reinforcing layer. And the inner ring of the reinforcing layer is connected with an inner soft sleeve. Through the arrangement of the outer soft sleeve, the upper connector, the first fixing ring, the second fixing ring, the inner soft sleeve and the reinforcing layer, and through the arrangement of the reinforcing layer clamped between the inner soft sleeve and the outer soft sleeve, the anti-pressure capability is greatly improved, meanwhile, the two rigid structures of the first fixing ring and the second fixing ring are distributed in a staggered mode to support the outer ring of the outer soft sleeve, and the anti-pressure capability is greatly improved. The anti-pressure capability is further improved, and the phenomenon that the soft sleeve expands and cracks due to circulation of a high-pressure medium is effectively avoided; and the working stability of the pressure-testable toe end well cementation fracturing sliding sleeve is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of pressure sliding sleeves, in particular to a cementing fracturing sliding sleeve with a testable pressure toe end. Background Art

[0002] Fracturing sleeves are mainly used as tools for deep collection of underground oil, natural gas and other resources. They can establish the first section of fracturing channel or pumping channel in high temperature, high pressure and cementing environment to facilitate the collection of underground resources.

[0003] A cementing and fracturing sleeve with application number 202321136921.1 comprises a horizontal ground, a placement cavity is arranged inside the horizontal ground, a perfusion cavity is arranged inside the placement cavity, a front pipe is arranged inside the perfusion cavity, a mounting ear is fixedly connected to the outer side of the front pipe, the number of the mounting ears is set to two, a sealing layer is fixedly connected to the inner wall of one side of the front pipe, a stretchable rubber ring is fixedly connected to the side of the front pipe away from the sealing layer, a rear pipe is fixedly connected to the side of the stretchable rubber ring away from the front pipe, and a mounting pipe is fixedly connected to the side of the rear pipe away from the stretchable rubber ring. The cementing and fracturing sleeve provided by the utility model solves the problem that the existing cementing and fracturing sleeves are all one-piece iron tubular devices, which are more convenient to install, but not convenient to be bent and placed underground, which reduces the convenience of use of the existing devices.

[0004] This technical solution realizes the function of bending the fracturing sleeve underground through the rubber ring, but high-pressure liquid will flow through the fracturing sleeve when it is working. Excessive pressure in the rubber ring can easily cause the rubber ring to expand and rupture, thereby causing the fracturing sleeve to break or leak. Utility Model Content

[0005] Based on this, the purpose of the utility model is to provide a cementing fracturing sleeve with a testable toe end, so as to solve the technical problems mentioned in the above background technology.

[0006] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a testable toe-end cementing fracturing sliding sleeve, comprising a lower joint and a middle joint, the top of the middle joint is connected to an outer soft sleeve, and the top of the outer soft sleeve is connected to an upper joint, the outside of the outer soft sleeve is respectively sleeved with a first fixing ring and a second fixing ring, the inner ring of the outer soft sleeve is connected to a reinforcement layer, and the inner ring of the reinforcement layer is connected to an inner soft sleeve.

[0007] By adopting the above technical solution, the compression resistance is greatly increased by setting the inner and outer soft sleeves with reinforcement layers. At the same time, the outer ring of the outer soft sleeve is supported by the staggered distribution of two rigid structures, the first fixed ring and the second fixed ring, to further increase the compression resistance and effectively avoid the expansion and rupture of the soft sleeve caused by the circulation of high-pressure medium.

[0008] Furthermore, the reinforcement layer is woven from narrow stainless steel strips, and the outer soft cover and the inner soft cover are both made of rubber material.

[0009] By adopting the above technical solution and setting the reinforcement layer between the inner soft sleeve and the outer soft sleeve, the pressure resistance is greatly increased, and the expansion and rupture of the soft sleeve caused by the circulation of high-pressure medium is effectively avoided.

[0010] Furthermore, the reinforcement layer is fixedly connected to the outer soft cover and the inner soft cover by means of adhesion using strong glue, and the outer soft cover is fixedly connected to the upper joint by means of adhesion using strong glue.

[0011] By adopting the above technical solution, several structures are connected and fixed by bonding with strong glue, which makes production simple and convenient and has good connection stability.

[0012] Furthermore, a plurality of the first fixing rings and a plurality of the second fixing rings are provided, and the plurality of first fixing rings and the plurality of second fixing rings are distributed alternately.

[0013] By adopting the above technical solution, the outer ring of the outer soft sleeve is supported by the two rigid structures of the first fixing ring and the second fixing ring which are staggered and distributed, thereby further increasing the pressure resistance.

[0014] Furthermore, the diameter of the second fixing ring is smaller than the diameter of the first fixing ring.

[0015] By adopting the above technical solution, since the diameter of the second fixing ring is smaller than the diameter of the first fixing ring, the plurality of first fixing rings can be distributed alternately with the plurality of second fixing rings.

[0016] Furthermore, the middle joint is connected to the top of the lower joint, and an inner sleeve is connected inside the lower joint and the middle joint, a positioning pin is connected between the inner sleeve and the middle joint, a sealing ring is connected between the inner sleeve and the lower joint and the middle joint, and a rupture disk and a sandblasting hole are respectively provided on the outer ring of the inner sleeve.

[0017] By adopting the above technical scheme, when working, the toe-end fracturing sleeve is lowered into the cementing well together with the casing as the first-stage fracturing sleeve. During the fracturing construction, pressure is applied from the wellhead into the casing to puncture the rupture disk, and at the same time the positioning pin is sheared off, so that the inner sleeve moves upward to open the toe-end fracturing sleeve, so as to establish the first section of the fracturing channel.

[0018] Furthermore, the rupture disk and the sandblasting hole are provided in plurality, and the plurality of rupture disks and the sandblasting holes are distributed in a ring array.

[0019] By adopting the above technical solution, during fracturing construction, pressure is applied from the wellhead into the casing to puncture the rupture disk, and at the same time the positioning pins are sheared off, so that the inner sleeve moves upward to open the toe fracturing sleeve.

[0020] Furthermore, the outer soft cover is fixedly connected to the middle joint by bonding with strong glue.

[0021] By adopting the above technical solution, the outer soft sleeve is connected to the middle joint by strong glue, so that the testable pressure toe cementing fracturing sliding sleeve can be bent and moved underground through the soft sleeve, and has strong flexibility.

[0022] In summary, the utility model mainly has the following beneficial effects:

[0023] The utility model greatly increases the pressure resistance through the arrangement of an outer soft sleeve, an upper joint, a first fixing ring, a second fixing ring, an inner soft sleeve and a reinforcement layer, and through the arrangement of the inner soft sleeve and the reinforcement layer sandwiched between the outer soft sleeve. At the same time, the outer ring of the outer soft sleeve is supported by the staggered distribution of two rigid structures, the first fixing ring and the second fixing ring, so as to further increase the pressure resistance and effectively avoid the expansion and rupture of the soft sleeve caused by the circulation of high-pressure medium; and improve the stability of the test pressure toe cementing fracturing sliding sleeve during operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a schematic diagram of the structure of the utility model;

[0025] Figure 2 This is a schematic diagram of the cross-sectional structure of the upper joint of the utility model;

[0026] Figure 3 For the utility model Figure 2 A magnified view of the structure at A;

[0027] Figure 4 It is a schematic diagram of the cross-sectional structure of the inner sliding sleeve of the utility model.

[0028] In the figure: 1. lower joint; 2. middle joint; 3. positioning pin; 4. inner sleeve; 5. sealing ring; 6. rupture disk; 7. sandblasting hole; 8. outer soft sleeve; 9. upper joint; 10. first fixing ring; 11. second fixing ring; 12. inner soft sleeve; 13. reinforcement layer. DETAILED DESCRIPTION

[0029] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. The embodiments described below with reference to the drawings are exemplary and are only used to explain the utility model, and cannot be understood as limiting the utility model.

[0030] The following describes an embodiment of the utility model based on its overall structure.

[0031] Embodiment 1:

[0032] The toe end cementing fracturing sleeve can be tested, such as Figure 1-Figure 3 As shown, it comprises a lower joint 1 and a middle joint 2, the top of the middle joint 2 is connected to an outer soft sleeve 8, the top of the outer soft sleeve 8 is connected to an upper joint 9, the outer soft sleeve 8 is fixedly connected to the upper joint 9 by means of strong glue by adhesion, and is convenient for connection with other fracturing sleeves; the outer soft sleeve 8 is respectively sleeved with a first fixing ring 10 and a second fixing ring 11, the diameter of the second fixing ring 11 is smaller than the diameter of the first fixing ring 10, and the first fixing ring 10 and the second fixing ring 11 are both provided with a plurality of them, and the plurality of first fixing rings 10 and the plurality of second fixing rings 11 are staggeredly distributed, and the first fixing rings 10 and the second fixing rings 11 are staggeredly distributed. The two rigid structures of the fixed ring 10 and the second fixed ring 11 are staggeredly distributed to support the outer ring of the outer soft sleeve 8 to further increase the compressive resistance; the inner ring of the outer soft sleeve 8 is connected to a reinforcement layer 13, which is woven with a narrow stainless steel belt, and the inner ring of the reinforcement layer 13 is connected to the inner soft sleeve 12. The reinforcement layer 13 is fixedly connected to the outer soft sleeve 8 and the inner soft sleeve 12 by adhesion with strong glue. The outer soft sleeve 8 and the inner soft sleeve 12 are both made of rubber material. The arrangement of the reinforcement layer 13 sandwiched between the inner soft sleeve 12 and the outer soft sleeve 8 greatly increases the compressive resistance.

[0033] See also Figure 1 and Figure 4 In the above embodiment, the middle joint 2 is connected to the top of the lower joint 1, and the outer soft sleeve 8 is fixedly connected to the middle joint 2 by means of strong glue by adhesion. The soft sleeve between the middle joint 2 and the upper joint 9 facilitates the turning operation of the toe end fracturing sleeve; the lower joint 1 and the middle joint 2 are internally connected with the inner sleeve 4, and the positioning pin 3 is connected between the inner sleeve 4 and the middle joint 2. A sealing ring 5 is connected between the inner sleeve 4 and the lower joint 1 and the middle joint 2. The outer ring of the inner sleeve 4 is respectively provided with a rupture disk 6 and a sandblasting hole 7, and the rupture disk 6 and the sandblasting hole 7 are provided with multiple rupture disks 6 and sandblasting holes 7. The multiple rupture disks 6 and sandblasting holes 7 are distributed in a circular array. The rupture disk 6 is punctured by pressing from the wellhead into the casing, and the positioning pin 3 is cut off at the same time, so that the inner sleeve 4 moves upward to open the toe end fracturing sleeve, so as to facilitate the establishment of the first section of the fracturing channel.

[0034] Embodiment 2:

[0035] Based on the above embodiment 1, refer to Figure 2 and Figure 3 The first fixing ring 10 and the second fixing ring 11 are made of one of stainless steel, aluminum alloy, and ABS plastic. The first fixing ring 10 and the second fixing ring 11 are staggeredly distributed as two rigid structures to support the outer ring of the outer soft sleeve 8, thereby further increasing the pressure resistance.

[0036] The implementation principle of the utility model is as follows: first, the soft sleeve between the middle joint 2 and the upper joint 9 facilitates the turning of the toe fracturing sleeve. The arrangement of the inner soft sleeve 12 and the inner reinforcement layer 13 of the outer soft sleeve 8 greatly increases the pressure resistance. At the same time, the first fixed ring 10 and the second fixed ring 11 are staggered to support the outer ring of the outer soft sleeve 8, further increasing the pressure resistance and effectively avoiding the expansion and rupture of the soft sleeve caused by the circulation of high-pressure medium.

[0037] During operation, the toe-end fracturing sleeve is lowered into the cementing well together with the casing as the first-stage fracturing sleeve. During fracturing construction, pressure is applied from the wellhead into the casing to puncture the rupture disk 6, and at the same time the positioning pin 3 is sheared off, so that the inner sleeve 4 moves upward to open the toe-end fracturing sleeve, so as to establish the first section of the fracturing channel.

[0038] Although an embodiment of the utility model has been shown and described, this specific embodiment is only an explanation of the utility model and is not a limitation of the utility model. The specific features, structures, materials or characteristics described may be combined in a suitable manner in any one or more embodiments or examples. After reading this specification, those skilled in the art may make modifications, substitutions and variations to the embodiments without creative contribution as needed without departing from the principles and purpose of the utility model. However, as long as they are within the scope of the claims of the utility model, they are protected by patent law.

Claims

1. A testable toe cementing fracturing sleeve comprises a lower joint (1) and a middle joint (2), and is characterized by: The top of the middle joint (2) is connected to an outer soft sleeve (8), and the top of the outer soft sleeve (8) is connected to an upper joint (9); the outer surface of the outer soft sleeve (8) is respectively sleeved with a first fixing ring (10) and a second fixing ring (11); the inner ring of the outer soft sleeve (8) is connected to a reinforcement layer (13), and the inner ring of the reinforcement layer (13) is connected to an inner soft sleeve (12).

2. The testable toe cementing fracturing sleeve according to claim 1, characterized in that: The reinforcement layer (13) is woven from narrow stainless steel strips, and the outer soft cover (8) and the inner soft cover (12) are both made of rubber material.

3. The testable toe cementing fracturing sleeve according to claim 2, characterized in that: The reinforcement layer (13) is fixedly connected to the outer soft cover (8) and the inner soft cover (12) by means of adhesion using strong glue, and the outer soft cover (8) is fixedly connected to the upper joint (9) by means of adhesion using strong glue.

4. The testable toe cementing fracturing sleeve according to claim 1, characterized in that: A plurality of the first fixing ring (10) and a plurality of the second fixing ring (11) are provided, and the plurality of first fixing rings (10) and the plurality of second fixing rings (11) are distributed alternately.

5. The testable toe cementing fracturing sleeve according to claim 4, characterized in that: The diameter of the second fixing ring (11) is smaller than the diameter of the first fixing ring (10).

6. The testable toe cementing fracturing sleeve according to claim 1, characterized in that: The middle joint (2) is connected to the top of the lower joint (1), and the lower joint (1) and the middle joint (2) are internally connected with an inner sleeve (4), a positioning pin (3) is connected between the inner sleeve (4) and the middle joint (2), a sealing ring (5) is connected between the inner sleeve (4) and the lower joint (1) and the middle joint (2), and the outer ring of the inner sleeve (4) is respectively provided with a rupture disk (6) and a sandblasting hole (7).

7. The testable toe cementing fracturing sleeve according to claim 6, characterized in that: The rupture disk (6) and the sandblasting holes (7) are both provided in plurality, and the plurality of rupture disks (6) and the sandblasting holes (7) are distributed in a ring array.

8. The testable toe cementing fracturing sleeve according to claim 6, characterized in that: The outer soft cover (8) is fixedly connected to the middle joint (2) by means of adhesion using strong glue.

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