Ball-throwing type full-bore infinite-pole sliding sleeve

Abstract

The utility model belongs to the technical field of oil exploration and development tools, and particularly relates to a pitching type full-bore infinite-pole sliding sleeve which comprises an upper connector, a lower connector and a connecting piece sleeve of the upper connector and the lower connector, and further comprises a clamping cylinder capable of being arranged in the sleeve in a sliding mode, the clamping cylinder is connected with the casing pipe through a sliding sleeve and at least one first positioning pin, covers the fracturing hole and is installed on the split type ball seat, and a sealing ball is arranged on the split type ball seat and located in the clamping cylinder. According to the sliding sleeve, the true full bore is achieved, the fracturing construction displacement is guaranteed, and the construction efficiency is greatly improved.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the petroleum exploration and development tool technical field, concretely relates to a ball-throwing type full gauge unlimited extreme sliding sleeve. BACKGROUND

[0002] The oil and gas well development at home and abroad all faces the problem of low natural production capacity and low development production rate of low permeability and ultra-low permeability reservoirs. The horizontal well multi-stage fracturing technology can effectively improve the recovery ratio and reserve producing ratio of low permeability oil and gas reservoirs, and is one of the important means for the development of low permeability oil and gas reservoirs. At present, the horizontal well fracturing technology commonly adopts sliding sleeve tools, and the sliding sleeves are designed in an extreme difference type, and the opening of the sliding sleeve and the isolation from the reformed section are realized by sequentially throwing the sealing tools corresponding to the sliding sleeves. The sliding sleeve and the ball seat are generally left in the well bottom, and finally the inner diameter of the well is small, the construction discharge capacity is limited, and the construction efficiency is low. SUMMARY

[0003] The utility model discloses a full gauge unlimited extreme ball-throwing type fracturing sliding sleeve, which can realize opening at any position, and after the sealing ball is discharged in a reverse discharge mode or dissolved after adopting a soluble ball, the ball seat can be fished by a special fishing tool, so that the full gauge in a true sense is realized, the fracturing construction discharge capacity is ensured, and the construction efficiency is greatly improved.

[0004] The technical scheme of the utility model is as follows:

[0005] A ball-throwing type full gauge unlimited extreme sliding sleeve, which comprises an upper joint, a lower joint and a connecting sleeve pipe, a fracturing hole is arranged on the sleeve pipe, a clamp cylinder is slidably arranged in the sleeve pipe, the clamp cylinder is connected with the sleeve pipe through a sliding sleeve and at least one positioning pin one and covers the fracturing hole, the clamp cylinder is installed on a split type ball seat, and a sealing ball is arranged on the split type ball seat and located in the clamp cylinder.

[0006] Specifically, the sliding sleeve comprises an outer sliding sleeve, an inner sliding sleeve connected with the outer sliding sleeve through an inner sliding sleeve guide rail and connected through a shear pin two, the inner sliding sleeve is connected with the clamp cylinder through an inner sliding sleeve sliding core and a pin, a groove is formed in the outer surface of the clamp cylinder, and the groove position and depth are matched with the pin one, and a shear pin one is arranged between the outer sliding sleeve and the sleeve pipe.

[0007] Specifically, the inner sliding sleeve sliding core comprises a sliding core upper joint, the sliding core upper joint comprises an end cover, a positioning pin two is arranged on the upper end of the end cover, a sealing cone is arranged on the lower end of the end cover, a pre-tightening spring is arranged around the end cover and the sealing cone, and a flow guide hole is formed in one side of the inner sliding sleeve and the sliding core upper joint.

[0008] Specifically, a sealing element is arranged on the clamp cylinder, and the sealing element is a rubber cylinder.

[0009] Specifically, the side of the inner sliding sleeve sliding core in contact with the clamp cylinder is a sealing profile.

[0010] The utility model discloses the beneficial effect is: the fracturing sliding sleeve can realize arbitrary position opening, and the sealing ball is discharged through the anti -displacement mode or adopts the soluble ball and dissolves, and the recess position and depth of the outer surface of the clamp cylinder correspond with the positioning pin one -to-one matching, and the clamp cylinder is as the key of matching sliding sleeve opening, when matching does not correspond, the positioning pin nail is used for fixing the position of the inner sliding sleeve, when matching corresponds, the rubber tube cooperates with the sealing profile, and the pressure higher than the lower cavity is produced on the cavity of sliding sleeve, and after the ball seat is fished through the special fishing tool, the full bore of the true sense can be realized, not only guarantee fracturing construction displacement, and construction efficiency will improve greatly. BRIEF DESCRIPTION OF DRAWINGS

[0011] Figure 1 It is the structural schematic diagram of the utility model;

[0012] Figure 2 It is the enlarged structural schematic diagram of the sliding core upper joint of the inner sliding sleeve sliding core.

[0013] 1 upper joint, 2 casing, 3 inner sliding sleeve guide rail, 4 outer sliding sleeve, 5 inner sliding sleeve sliding core, 6 inner sliding sleeve,

[0014] 7 rubber tube, 8 clamp cylinder, 9 positioning pin nail one, 12 sealing ball, 13 shear pin one, 14 shear pin two, 15 lower joint, 16 fracturing hole, 17 positioning pin nail two, 18 end cover, 19 pre-tightening spring, 20 flow guide hole, 21 sealing cone, 22 sealing profile. DETAILED DESCRIPTION

[0015] The technical scheme of the utility model will be described in detail below in combination with the drawings and specific embodiments.

[0016] As Figure 1 It is a kind of structure schematic diagram of throwing ball type full bore infinite sliding sleeve, including upper joint 1, lower joint 15 and its connecting piece casing 2, be provided with fracturing hole 16 on the casing 2, still include the clamp cylinder 8 of the slidingly arranged in the casing 2, the sealing element of the clamp cylinder 8 is set, and sealing element is rubber tube 7.The clamp cylinder 8 is connected with the casing 2 through sliding sleeve and at least one positioning pin nail one 9 and covers the fracturing hole 16, is installed on the split ball seat, and the split ball seat is provided with sealing ball 12 in the interior of clamp cylinder 8.

[0017] The inner sliding sleeve 6 is connected with the inner sliding sleeve sliding core 5 and the clamp cylinder 8 through a pin, and the side of the inner sliding sleeve sliding core 5 and the clamp cylinder 8 in contact is a sealing profile 22.

[0018] The inner sliding sleeve sliding core 5 comprises a sliding core upper joint, the sliding core upper joint comprises an end cover 18, the end cover 18 is provided with a positioning pin No. 2 17 at the upper end and a sealing cone 21 at the lower end, and a pre-tightening spring 19 is arranged around the end cover 18 and the sealing cone 21, the pre-tightening force of the pre-tightening spring 19 can be adjusted by adjusting the positioning pin No. 2 17, and a flow guide hole 20 is arranged on the sliding core upper joint and faces one side of the inner sliding sleeve 6.

[0019] The working principle of the ball-throwing type full-gauge unlimited sliding sleeve is as follows: the sliding sleeve is pressed to a certain pressure, the shear pin 13 is sheared, and the outer sliding sleeve 4 is opened. The fracturing fluid realizes bottom fracturing through the fracturing hole 16, and through the special fishing tool, the inner sliding sleeve guide rail 3 is lifted to make the shear pin No. 2 14 sheared, the inner sliding sleeve 6 and the clamp cylinder 8 are fished out, the sliding sleeve full-gauge is realized, the groove position and depth of the outer surface of the clamp cylinder 8 match the positioning pin 11, the clamp cylinder 8 is used as the key to open the inner sliding sleeve 6, when the matching is not corresponding, the positioning pin No. 1 9 is used for fixing the position of the inner sliding sleeve 6, when the matching is corresponding, the rubber cylinder 7 cooperates with the sealing profile 22 to generate a pressure higher than that of the lower cavity on the upper cavity of the inner sliding sleeve 6. When the matching is corresponding, the pressure of the upper cavity of the inner sliding sleeve 6 overcomes the pre-tightening force of the pre-tightening spring 19, and the sealing cone 21 is bounced off, and the inner sliding sleeve 6 is rapidly slid through the flow guide hole 20. The clamp cylinder 8 is locked in position under the action of the positioning pin 11, the outer sliding sleeve 4 can be slid upward through the special tool, and the sliding sleeve is closed.

[0020] Finally, it should be noted that: the above examples are only used to illustrate the technical scheme of the utility model and not to limit it; although the utility model has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the specific embodiments of the utility model can be modified or some technical features can be replaced by equivalents; without departing from the spirit of the technical scheme of the utility model, they should be covered in the technical scheme range of the utility model claimed to be protected.

Claims

1. A ball-drop full-gauge unlimited slip sleeve, comprising an upper joint (1), a lower joint (15) and a connecting sleeve (2) therebetween, characterized in that, The sleeve (2) is provided with a fracturing hole (16), and further comprises a collet (8) slidably arranged in the sleeve (2), the collet (8) is connected with the sleeve (2) through a sliding sleeve and at least one positioning pin (9) and covers the fracturing hole (16), and is installed on a split ball seat, and the split ball seat is provided with a sealing ball (12) located in the collet (8).

2. The drop ball full gauge unlimited slip sleeve of claim 1 wherein, The sliding sleeve comprises an outer sliding sleeve (4), an inner sliding sleeve (6) connected with the outer sliding sleeve (4) through an inner sliding sleeve guide rail (3) and connected through a shear pin (14), the inner sliding sleeve (6) is connected with the collet (8) through an inner sliding sleeve sliding core (5) and a pin, the outer surface of the collet (8) is provided with a groove, and the groove position and depth are matched with the pin.

3. The drop ball full gauge unlimited slip sleeve of claim 2, wherein, The inner sliding sleeve sliding core (5) comprises a sliding core upper connector, the sliding core upper connector comprises an end cover (18), the end cover (18) is provided with a positioning pin (17) at the upper end and a sealing cone (21) at the lower end, and a pre-tightening spring (19) is arranged around the end cover (18) and the sealing cone (21), and the sliding core upper connector is provided with a flow guide hole (20) on one side of the inner sliding sleeve (6).

4. The drop ball full gauge unlimited slip sleeve of claim 1 wherein, The collet (8) is provided with a sealing element, and the sealing element is a rubber tube (7).

5. The drop ball full gauge unlimited slip sleeve of claim 2 wherein, The side of the inner sliding sleeve sliding core (5) in contact with the collet (8) is a sealing profile (22).

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