CN201277007Y - Anti-sticking sliding sleeve backwash valve - Google Patents

Abstract

The utility model provides an anti-sticking sliding sleeve backwash valve for paraffin precipitation is alleviated in oil field oil well backwash, includes top connection (1), urceolus (2), inner tube (3), balance hole (4), reset spring (5), sliding sleeve (6) etc, top connection (1) respectively with urceolus (2), inner tube (3) are connected, lower clutch (9) respectively with urceolus (2), inner tube (3) are connected, install reset spring (5) between urceolus (2) and inner tube (3), the lower part of reset spring (5) is equipped with sliding sleeve (6), the effectual low success rate problem of backwash well operation on the pump of having solved. The anti-blocking sliding sleeve backwashing valve has the characteristics that the maximum inner diameter is 62mm, the valve can be used for being mounted on a mechanical oil extraction pump, the process is reliable, the valve is flexible to open and close, the anti-blocking function is realized, and the operation is simple; the body can be repeatedly used; flexible disassembly and assembly; easy processing and maintenance, low manufacturing cost and good economical efficiency.

Description

Anti-seize slip sleeve backwash valve

technical field

The utility model belongs to a downhole tool for backwashing of oil wells in an oil field for relieving wax deposition, in particular to an anti-jamming sliding sleeve backwashing valve.

Background technique

At present, there are many kinds of backwash switches used in backwash operations, but the success rate of on-site implementation is not high. Second, the backwashing mechanism of the backwashable packer is limited by the structure of the packer, resulting in a maximum internal diameter of less than 62mm, which cannot be applied to the pump; third, the sliding sleeve switch is due to the mechanical fluid contained in the well fluid. The sliding sleeve is "stuck" due to impurities, which causes the well flushing switch to not be opened accurately or flexibly closed after opening; the fourth is that the design of the sealing ring is unreasonable, and the phenomenon of cutting the sealing ring will occur during mechanical action, resulting in tool leakage.

Contents of the invention

The purpose of the utility model is to provide an anti-jamming slip sleeve backwash valve, which can solve the problems of low success rate of backwash well operation on the current oil well pump and inability to heat wash the seat seal well; the tool structure is simple, the pressure bearing capacity is strong, Reusable, small size, easy processing and maintenance, and low cost.

The utility model is realized in the following way: including upper joint, outer cylinder, inner cylinder, balance hole, return spring, sliding sleeve, liquid inlet hole, liquid outlet hole, lower joint, square sealing ring, concave sealing ring, T-shaped sealing ring, sealing ring, the upper joint is connected with the outer cylinder and the inner cylinder respectively, the lower joint is connected with the outer cylinder and the inner cylinder respectively, a return spring is installed between the outer cylinder and the inner cylinder, and a sliding sleeve is provided at the bottom of the return spring.

A return spring and a sliding sleeve are installed in the annular cavity formed by the upper joint, the lower joint, the outer cylinder and the inner cylinder.

The upper end of the sliding sleeve is provided with a concave sealing ring near the return spring.

The number of concave sealing rings is ≥1.

A T-shaped sealing ring is embedded near the lower joint at the lower end of the sliding sleeve.

A balance hole is opened on the inner cylinder close to the upper joint.

Four balance holes are evenly distributed along the circumference.

A square sealing ring is arranged between the upper joint and the outer cylinder.

A sealing ring is arranged between the lower joint and the outer cylinder.

The utility model has the advantages of effectively solving the problem of low success rate of backwashing operation on the pump. The anti-seize slip sleeve backwash valve has a maximum internal diameter of 62mm and can be installed on mechanical oil pumps. It has reliable technology, flexible switching, anti-seize function, and simple operation; the body can be reused; flexible disassembly and installation; easy Processing and maintenance, low manufacturing cost, good economy.

Description of drawings

Accompanying drawing is the structural representation of the utility model.

Detailed ways

As shown in the drawings, it includes upper joint 1, outer cylinder 2, inner cylinder 3, balance hole 4, return spring 5, sliding sleeve 6, liquid inlet hole 7, liquid outlet hole 8, lower joint 9, square sealing ring 10, Concave sealing ring 11, T-shaped sealing ring 12, sealing ring 13, the upper joint 1 is connected with the outer cylinder 2 and the inner cylinder 3 respectively, the lower joint 9 is respectively connected with the outer cylinder 2 and the inner cylinder 3, the outer cylinder 2 is connected with the inner cylinder Return spring 5 is installed between 3, and the bottom of return spring 5 is provided with sliding sleeve 6.

Back-moving spring 5 and sliding sleeve 6 are installed in the annular cavity formed by upper joint 1, lower joint 9, outer cylinder 2 and inner cylinder 3.

The upper end of the sliding sleeve 6 is provided with a concave sealing ring 11 near the return spring 5 .

The number of concave sealing rings 11 is ≥1.

A T-shaped sealing ring 12 is embedded near the lower joint 9 at the lower end of the sliding sleeve 6 .

There are four balance holes 4 uniformly distributed on the inner cylinder 3 near the upper joint 1 .

Four balance holes 4 are evenly distributed along the circumference.

A square sealing ring 10 is arranged between the upper joint 1 and the outer cylinder 2 .

A sealing ring 13 is provided between the lower joint 9 and the outer cylinder 2 .

The utility model provides an anti-jamming sliding sleeve backwash valve. A sliding sleeve 6 and a return spring 5 are installed in an annular cavity formed by an upper joint 1, a lower joint 9, an outer cylinder 2 and an inner cylinder 3. The upper end of the sliding sleeve 6 is provided with three concave sealing rings 11 near the return spring 5 . A T-shaped sealing ring 12 is embedded near the lower joint 9 at the lower end of the sliding sleeve 6 . There are four balance holes evenly distributed on the inner cylinder 3 near the upper joint 1 .

In actual use: connect the upper joint 1 of the anti-jamming backwash valve directly to the tubing, and the lower joint 9 to directly connect to the upper part of the packer, and jointly connect the upper and lower wells of the oil pump to set the packer for normal production; A 12m ³ tank car and a hot washing car need to be prepared during the well washing operation. Open the oil well casing to vent the gas, connect the pipeline to the tank car and the hot washing car, connect the hot car washing outlet pipeline to the oil well casing gate, and pressurize from the annular space to reduce the temperature to 90 ℃, the well flushing fluid is injected, and the flushing fluid acts on the protruding end surface of the sliding sleeve 6 through the liquid inlet hole 7, pushing the sliding sleeve 6 upward. When the annular pressure is greater than the internal pressure of the pipe string, the sliding sleeve 6 is pushed Open, the well flushing channel is opened, and the liquid enters the pipe string through the liquid outlet hole 8, and the backwashing operation can be realized. When the well flushing is completed, the annular space pressure is released, and the sliding sleeve 6 pushes the sliding sleeve 6 downward under the action of the elastic force of the return spring 5 and the internal pressure of the oil pipe, and closes the well flushing passage.

Claims (8)

1. Anti-seize sliding sleeve backwash valve, including upper joint (1), outer cylinder (2), inner cylinder (3), balance hole (4), return spring (5), sliding sleeve (6), liquid inlet (7), liquid outlet hole (8), lower joint (9), square sealing ring (10), concave sealing ring (11), T-shaped sealing ring (12), sealing ring (13), characterized in that: The upper joint (1) is respectively connected with the outer cylinder (2) and the inner cylinder (3), the lower joint (9) is respectively connected with the outer cylinder (2) and the inner cylinder (3), and the outer cylinder (2) is connected with the inner cylinder (3) ) is installed with a return spring (5), and the bottom of the return spring (5) is provided with a sliding sleeve (6). 2. The anti-seize slip sleeve backwash valve according to claim 1, characterized in that: in the annular cavity formed by the upper joint (1), the lower joint (9), the outer cylinder (2), and the inner cylinder (3) A return spring (5) and a sliding sleeve (6) are installed respectively. 3. The anti-seize sliding sleeve backwash valve according to claim 1, characterized in that: a concave sealing ring (11) is installed on the upper end of the sliding sleeve (6) near the return spring (5). 4. The anti-seize slip sleeve backwash valve according to claim 3, characterized in that: the number of concave sealing rings (11) is ≥1. 5. The anti-seize sliding sleeve backwash valve according to claim 1, characterized in that: a T-shaped sealing ring (12) is embedded at the lower end of the sliding sleeve (6) near the lower joint (9). 6. The anti-seize slip sleeve backwash valve according to claim 1, characterized in that: a balance hole (4) is opened on the inner cylinder (3) close to the upper joint (1). 7. The anti-seize slip sleeve backwash valve according to claim 6, characterized in that: four balance holes (4) are evenly distributed along the circumference. 8. The anti-seize slip sleeve backwash valve according to claim 1, characterized in that: a square sealing ring (10) is provided between the upper joint 1 and the outer cylinder (2), and a square sealing ring (10) is provided between the lower joint (9) and the outer cylinder A sealing ring (13) is provided between (2).

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