CN205422668U - Water injection string pressure telescopic compensator - Google Patents

Abstract

A water injection pipe column pressure telescopic compensator, the lower part of the telescopic plunger is connected to the upper part of the plunger, the lower part of the plunger is connected to the upper part of the anti-rotation connecting pipe, the lower part of the outer cylinder is connected to the upper part of the connecting head, and the outer cylinder, The head is set outside the telescopic plunger, the inner wall of the connecting head is installed with a sealing ring, the hydraulic cylinder is set outside the plunger, and the intermediate sealing ring is installed on the outer wall of the plunger, the upper part of the hydraulic cylinder is connected with the lower part of the connecting head, and the upper part of the hydraulic cylinder is threaded There is an external connection hole below, and the external connection hole is above the intermediate sealing ring. The sealing seat is set on the section A of the anti-rotation connecting pipe. The sealing seat is connected with the lower part of the hydraulic cylinder. The inner wall of the sealing seat is installed with the lower The sealing ring, under the action of the area difference between the telescopic plunger and the plunger, compensates for the expansion and contraction of the water injection string, so that the packer connected under it does not wriggle, which can prevent the packer from being damaged, and can prevent the packer from being damaged. The water injection well can inject water in separate layers reliably for a long time, and improve the effect of water injection development in the oil field.

Description

A water injection string pressure expansion and contraction compensator

technical field

The utility model belongs to a device for balancing the axial force caused by water injection pressure of an oil-water well pipe string in an oil field, and is a pressure expansion and contraction compensator for a water injection pipe string.

Background technique

In the layered water injection string in the oilfield, a multi-stage packer with a large diameter is lowered. Due to the pressure difference between the layers, after the packer is seated and injected with water, it will generate a downward axial force, so that the string will carry the seat. The sealed packer moves. At this time, since the packer is tightly attached to the inner wall of the casing, when the water injection string moves with the sealed packer, the packer’s movement will be under the action of static friction. The rubber tube is sheared and easily torn, resulting in damage to the water injection string, and layered water injection cannot be achieved, and the effect of water injection development cannot be achieved. In the process of water injection and stop injection, the water injection string will also be extended or shortened, causing the water injection packer to creep, and the above-mentioned problems will also occur. In order to solve this problem, a telescoping device is generally installed on the water injection packer. However, the structure of the current retractor is too simple, there is no compensation function, and there is no displacement when the pressure changes, and it cannot prevent the displacement and displacement trend between the packer and the casing, and the rubber tube of the packer is still subject to shear. Cutting power also has the above-mentioned problems.

Contents of the invention

The purpose of this utility model is to design a water injection string pressure expansion and contraction compensator, which can overcome the above-mentioned existing problems, and can compensate the expansion and contraction of the water injection string under the action of the pressure difference, avoid packer peristalsis, and prevent the packer from being damaged. Long-term reliable layered water injection of water injection wells can improve the effect of water injection development in oil fields.

The purpose of this utility model is achieved in this way: including outer cylinder, telescopic plunger, connecting head, upper sealing ring, middle sealing ring, plunger, hydraulic cylinder, anti-rotation connecting pipe, sealing seat, lower sealing ring, telescopic plunger The lower part of the plunger is connected with the upper part of the plunger, the lower part of the plunger is connected with the upper part of the anti-rotation connecting pipe, the lower part of the outer cylinder is connected with the upper part of the connector, the outer cylinder and the connector are set outside the telescopic plunger, and the inner wall of the connector is installed The upper sealing ring, the upper sealing ring seals the gap between the telescopic plunger and the connector, the hydraulic cylinder is set outside the plunger, and the middle sealing ring is installed on the outer wall of the plunger to seal the gap between the plunger and the hydraulic cylinder, the hydraulic cylinder The upper part is connected to the lower part of the connecting head. There is an external through hole under the upper thread of the hydraulic cylinder. The external through hole is located on the middle sealing ring. The sealing seat is set on the A section of the anti-rotation connecting pipe. The sealing seat and The lower part of the hydraulic cylinder is connected, and a lower sealing ring is installed on the inner wall of the sealing seat, and the lower sealing ring seals the gap between the anti-rotation connecting pipe and the sealing seat.

On the anti-rotation connecting pipe, there is a section B which is larger than the diameter of the section A. The diameter of the section B is larger than the diameter of the upper thread of the anti-rotation connecting pipe. A vertical groove is arranged on the section B, and the upper thread of the sealing seat The anti-rotation pin is placed in the jack above, the axis of the anti-rotation pin is perpendicular to the axis of the anti-rotation connecting pipe, the front end of the anti-rotation pin is in the vertical groove, and the tail end of the anti-rotation pin is held by the hydraulic cylinder. The inner wall surrounds, so that the anti-rotation pin cannot withdraw from the vertical groove.

The upper part of section B on the anti-rotation connecting pipe has an internal through hole, and the internal through hole communicates the annular cavity between the hydraulic cylinder and the anti-rotation connecting pipe with the inside of the anti-rotation connecting pipe.

The upper part of the telescopic plunger is connected with the upper joint, and the joint is kept sealed, and the upper part of the upper joint has an oil pipe internal thread.

The lower part of the anti-rotation connecting pipe is connected with the lower joint, and the joint is kept sealed , and the lower part of the lower joint has an oil pipe external thread.

When the telescopic plunger is at the upper starting point, the telescopic plunger is under the upper end surface of the outer cylinder, and the telescopic plunger does not protrude beyond the upper end surface of the outer cylinder.

The beneficial effects of the utility model are: the utility model is in a stretched state when going into the well, and the packer connected to the lower part is in a seated state before water injection, and the internal pressure rises during water injection, causing the water injection string to wriggle and pass through the inline through hole Pressure, under the action of the area difference between the telescopic plunger and the plunger, only the outer cylinder, connector, hydraulic cylinder, and sealing seat move downward with the pipe string, while the telescopic plunger and anti-rotation connecting pipe do not move, which compensates for the water injection pipe string The expansion and contraction of the packer makes the packer connected under it immobile, avoids the creep of the packer, and prevents the packer from being damaged. The water injection well can inject water in layers reliably for a long time, which greatly improves the effect of water injection development in the oilfield, and has a significant economic benefits.

Description of drawings

Accompanying drawing 1 is the assembly drawing when being in retracted state of the utility model.

detailed description

Below in conjunction with accompanying drawing 1 embodiment of the present utility model is described.

As shown in the figure, the embodiment of the utility model includes an upper joint 1, an outer cylinder 2, a telescopic plunger 3, a connecting head 4, an upper sealing ring 5, an intermediate sealing ring 7, a plunger 8, a hydraulic cylinder 9, and an anti-rotation connection Tube 10, anti-rotation pin 12, sealing seat 13, lower seal ring 14, the bottom of telescopic plunger 3 is connected with the top of plunger 8, and the connection is kept sealed (sealed by the seal ring), and the bottom of plunger 8 is connected with the upper part of the plunger 8. The upper part of the transfer connecting pipe 10 is connected, the lower part of the outer cylinder 2 is connected with the upper part of the connector 4, and the connection is kept sealed (sealed by a sealing ring), the outer cylinder 2 and the connector 4 are set outside the telescopic plunger 3, and the connector The upper sealing ring 5 is installed on the inner wall of 4, the upper sealing ring 5 seals the gap between the telescopic plunger 3 and the connector 4, the hydraulic cylinder 9 is set outside the plunger 8, and the intermediate sealing ring 7 is installed on the outer wall of the plunger 8, Seal the gap between the plunger 8 and the hydraulic cylinder 9. The upper part of the hydraulic cylinder 9 is connected to the lower part of the connector 4. There is an external through hole 6 under the upper thread of the hydraulic cylinder 9 to balance the pressure. The communication hole 6 is located on the middle sealing ring 7, the sealing seat 13 is set on the section A of the anti-rotation connecting pipe, the sealing seat 13 is connected with the lower part of the hydraulic cylinder 9, and the connection is kept sealed (the sealing is realized by the sealing ring), and the sealing A lower sealing ring 14 is installed on the inner wall of the seat 13, and the lower sealing ring 14 seals the gap between the anti-rotation connecting pipe 10 and the sealing seat 13.

On the anti-rotation connecting pipe 10 there is a B section larger than the diameter of the A section, the diameter of the B section is larger than the upper thread diameter of the anti-rotation connecting pipe 10, a vertical groove 11 is set on the B section, and the seal seat Anti-rotation pin 12 is placed in the jack above the upper thread of 13, the axis of anti-rotation pin 12 is perpendicular to the axis of anti-rotation connecting pipe 10, and the front end of anti-rotation pin 12 is in the described vertical groove 11, anti-rotation The tail end of the rotating pin 12 is surrounded by the inner wall of the hydraulic cylinder 9, so that the anti-rotating pin 12 cannot withdraw from the vertical groove 11. This design is to ensure that all the water injection pipe strings can transmit torque, so that the water injection pipe can be rotated to release the stuck pipe string after the lifting pipe is stuck in the next operation. The anti-rotation connecting pipe 10 has a section B with a diameter greater than that of section A in order to increase the strength of this section, so that it can ensure sufficient tensile capacity when processing the above-mentioned vertical groove 11 .

The upper part of section B on the anti-rotation connecting pipe 10 has an inline through hole 16, and the inline through hole 16 connects the annular cavity 17 between the hydraulic cylinder 9 and the anti-rotation connecting pipe 10 with the anti-rotation connecting pipe 10. internal communication.

The top of the telescopic plunger 3 is connected to the upper joint 1, and the joint is kept sealed, and the top of the upper joint 1 has an oil pipe internal thread. When the inside of the telescopic plunger 3 does not need other tools, the outer cylinder 2 can select the same steel pipe as the outer diameter of the water injection pipe, and directly process the oil pipe thread connecting the top on it.

The lower part of the anti-rotation connecting pipe 10 is connected to the lower joint 15, and the joint is kept sealed , and the lower part of the lower joint 15 has an oil pipe external thread. When the inside of the telescopic plunger 3 does not need other tools, the anti-rotation connecting pipe 10 can select the steel pipe that the lower tool matches, and directly process the thread that connects the lower tool on it.

When the telescopic plunger 3 is at the upper starting point, the telescopic plunger 3 is under the upper end surface of the outer cylinder 2, and the telescopic plunger 3 does not protrude beyond the upper end surface of the outer cylinder 2, so as to prevent the telescopic plunger 3 from injecting water on it. Avoid damage inside the tube.

The utility model is in a stretched state when going downhole. When stretched, the upper end surface of the telescopic plunger 3 is above the upper sealing ring 5. The packer connected to the lower part is in a seated state before water injection. The water pipe column wriggles, and the pressure is transmitted through the inline through hole 16. Under the action of the area difference between the telescopic 3 and the plunger 8, only the outer cylinder 2, the connector 4, the hydraulic cylinder 9, and the sealing seat 13 move downward with the pipe column. The plunger 3 and the anti-rotation connecting pipe 10 do not move, which compensates for the expansion and contraction of the water injection string, so that the packer connected thereunder does not move, avoids the packer from wriggling, and can prevent the packer from being damaged.

Claims (6)

1. null1. a water injection string pressure telescopic compensator，Including urceolus (2)、Telescopic plunger (3)、Union joint (4)、Upper sealing ring (5)、Intermediate seal circle (7)、Plunger (8)、Hydraulic cylinder (9)、Anti-rotation connecting tube (10)、Seal receptacle (13)、Lower seal (14)，It is characterized in that: the bottom of telescopic plunger (3) is connected with the top of plunger (8)，The bottom of plunger (8) is connected with the top of anti-rotation connecting tube (10)，The bottom of urceolus (2) is connected with the top of union joint (4)，Urceolus (2)、Union joint (4) is sleeved on telescopic plunger (3) outward，Sealing ring (5) is installed on the inwall of union joint (4)，Upper sealing ring (5) seals the gap between telescopic plunger (3) and union joint (4)，Hydraulic cylinder (9) is sleeved on plunger (8) outward，Intermediate seal circle (7) is installed on the outer wall of plunger (8)，Gap between sealed plunger (8) and hydraulic cylinder (9)，The top of hydraulic cylinder (9) is connected to the bottom of union joint (4)，Outer linked hole (6) is had under the top screw thread of hydraulic cylinder (9)，Described outer linked hole (6) is on intermediate seal circle (7)，Seal receptacle (13) is sleeved in the A section in anti-rotation connecting tube (10)，Seal receptacle (13) is connected with the bottom of hydraulic cylinder (9)，Lower seal (14) is installed on the inwall of seal receptacle (13)，Lower seal (14) seals the gap between anti-rotation connecting tube (10) and seal receptacle (13).
2. A kind of water injection string pressure telescopic compensator the most according to claim 1, it is characterized in that: in anti-rotation connecting tube (10), have the B section more than described A section diameter, the diameter of described B section is more than the top diameter of thread of anti-rotation connecting tube (10), described B section arranges vertical-shaped groove (11), anti-rotation pin (12) is placed in jack on the top screw thread of seal receptacle (13), the axis of anti-rotation pin (12) is vertical with the axis of anti-rotation connecting tube (10), it is inner that the front end of anti-rotation pin (12) is in described vertical-shaped groove (11), the tail end of anti-rotation pin (12) is surrounded by the inwall of hydraulic cylinder (9), make anti-rotation pin (12) can not exit from described vertical-shaped groove (11) is.
3. A kind of water injection string pressure telescopic compensator the most according to claim 2, it is characterized in that: the top of the described B section in anti-rotation connecting tube (10) has interior linked hole (16), described interior linked hole (16) to make the inside UNICOM of the toroidal cavity (17) between hydraulic cylinder (9) and anti-rotation connecting tube (10) and anti-rotation connecting tube (10).
4. A kind of water injection string pressure telescopic compensator the most according to claim 3, is characterized in that: the top of telescopic plunger (3) connects top connection (1), and described junction keeps sealing, and oil pipe female thread is arranged at the top of top connection (1).
5. A kind of water injection string pressure telescopic compensator the most according to claim 3, is characterized in that: the bottom of anti-rotation connecting tube (10) connects lower contact (15), described junctionKeep sealing, oil tube external thread is arranged at the bottom of lower contact (15).
6. A kind of water injection string pressure telescopic compensator the most according to claim 3, it is characterized in that: when telescopic plunger (3) is in initial point, telescopic plunger (3) is under the upper surface of urceolus (2), and telescopic plunger (3) does not reach outside the upper surface of urceolus (2).