CN215332761U

CN215332761U - Expanding packer

Info

Publication number: CN215332761U
Application number: CN202120670133.5U
Authority: CN
Inventors: 魏勇舟; 孙玉龙; 易婕; 张熙昊; 张智泰; 张珂语
Original assignee: Shandong Bonuoli Petroleum Equipment Co ltd
Current assignee: Shandong Bonuoli Petroleum Equipment Co ltd
Priority date: 2021-04-01
Filing date: 2021-04-01
Publication date: 2021-12-28
Anticipated expiration: 2031-04-01

Abstract

An expanding packer, the packing element is sleeved outside the inner tube, the upper part of the lower joint is connected with the lower part of the inner tube and the lower part of the packing element, the joint keeps sealed, the inner wall and the outer wall of the isolation piston are provided with sealing rings, the isolation piston is arranged in the isolation sleeve, the lower part of the isolation sleeve is connected with the upper part of the packing element, the joint keeps sealed, the inner wall of the packing element, the lower inner wall of the isolation sleeve, the lower end face of the isolation piston and the outer wall of the inner tube enclose a closed annular cavity, the lower side wall of the connecting sleeve is provided with a valve cavity, the top end of the valve cavity is provided with a valve hole, a valve ball is arranged in the valve cavity, a connecting hole is arranged below the upper thread of the connecting sleeve, the side wall of the connecting sleeve is provided with an annular groove, the lower thread of the connecting sleeve is connected with the upper part of the isolation sleeve, the middle thread of the connecting sleeve is connected with the upper part of the inner tube, the lower end of the unsealing piston is provided with a thimble, the lower part of the unsealing piston is arranged in the annular groove, the lower part of the upper joint is connected with the upper thread of the connecting sleeve, and the lower part of the upper joint is inserted into the upper part of the unsealing piston.

Description

Expanding packer

Technical Field

The utility model relates to a tool for a separate layer water injection well of an oil field, in particular to an expansion packer.

Background

The oil field water injection well has the multilayer and needs water injection simultaneously to every layer water injection volume is different, need separate each layer with the packer, carries out the water distribution to every layer, reaches the purpose of layering, weight water injection. And a packer is adopted for realizing separate-layer water injection. One type of packer currently in use is an expandable packer. When the pressure in the rubber sleeve is higher than the pressure outside the rubber sleeve (generally 1 MPa), the rubber sleeve expands outwards to seal the annular space of the oil casing. When the expandable packer is to be lifted out of the well, the pressure in the rubber sleeve is required to be equal to or less than the pressure outside the rubber sleeve, so that the rubber sleeve is contracted and can be lifted out after being restored. The inner cavity of a rubber sleeve of the existing expanding packer is communicated with an inner pipe in a two-way mode, and the inner cavity of the existing expanding packer is filled with injected water all the time after the existing expanding packer is put into a well. Because the injected water is corrosive, mechanical impurities generated in the well due to corrosion are filled into the inner cavity of the rubber sleeve, the rubber sleeve of the conventional expansion type packer is difficult to withdraw, and the tubular column of the packer generates creeping in an expansion state when the injection of the water injection well is stopped due to accidents, so that the rubber sleeve is damaged quickly, the layered water injection cannot be performed, and the development effect of the oil field is influenced. Because the rubber sleeve can not be recovered smoothly, the pipe column is easy to clamp when the pipe column is lifted up during well repair, the well repair is difficult, and the well repair cost is increased.

Disclosure of Invention

The utility model aims to provide an expansion packer, which avoids the problems, prolongs the service life of the packer, enables a water injection well to effectively perform layered water injection for a long time and improves the development effect of an oil field.

The purpose of the utility model is realized as follows: the valve comprises an upper joint, a deblocking piston, a valve ball, a connecting sleeve, an isolating piston, an inner pipe, a rubber cylinder and a lower joint, wherein the rubber cylinder is sleeved outside the inner pipe, the upper part of the lower joint is connected with the lower part of the inner pipe and the lower part of the rubber cylinder, sealing rings are arranged on the inner wall and the outer wall of the isolating piston, the isolating piston is arranged in the isolating sleeve, the lower part of the isolating sleeve is connected with the upper part of the rubber cylinder, the isolating piston is sleeved on the inner pipe, the joint of the isolating sleeve and the rubber cylinder keeps sealed, the sealing ring arranged on the inner wall of the isolating piston seals a gap between the inner wall of the isolating piston and the outer wall of the inner pipe, the sealing ring arranged on the outer wall of the isolating piston seals a gap between the outer wall of the isolating piston and the inner wall of the isolating sleeve, the inner wall of the rubber cylinder, the lower inner wall of the isolating sleeve, the lower end face of the isolating piston and the outer wall of the inner pipe form a sealed annular cavity, and a valve cavity is arranged on the lower side wall of the connecting sleeve, the valve pocket on the top drill and establish the valve opening the valve pocket in place the valve ball, the valve ball can with the lower extreme cooperation of valve opening sealed, have the antithetical couplet through-hole under the upper portion screw thread of hookup cover, set up the annular on the lateral wall of hookup cover, the annular be in under the antithetical couplet through-hole, the upper end of valve opening with the annular communicate with each other, the lower screw thread of hookup cover is connected with the upper portion of separation sleeve, the junction keeps sealed, the well screw thread of hookup cover is connected with the upper portion of inner tube, the junction keeps sealed, the hookup cover is connected the back valve ball with the separation sleeve and can not deviate from the valve pocket, the lower extreme of deblocking piston has the thimble, the lower part of deblocking piston is installed in the annular, the thimble pass the valve opening with the valve ball pressure leave the valve opening, the cross-sectional area of thimble be less than the area of valve opening, make the thimble with the valve opening between have a liquid flow channel, the clearance between the outer wall of deblocking piston and the outside circular face of annular between have the sealing washer sealed, make the liquid of deblocking piston lower extreme can not flow out through the clearance between the two, the lower part of top connection and the last threaded connection of hookup cover, the lower part outer wall of top connection inserts in the upper portion of deblocking piston, has the sealing washer between the lower part outer wall of top connection and the upper portion inner wall of deblocking piston, the clearance between the lower part outer wall of this sealing washer sealed top connection and the upper portion inner wall of deblocking piston.

The unsealing piston is connected to the upper joint through shear pins.

The utility model has the beneficial effects that: the anticorrosion liquid is filled into the annular cavity, the inside of the rubber sleeve is isolated, well liquid and sundries cannot enter the rubber sleeve, the inside of the rubber sleeve cannot be corroded, and the rubber sleeve can be smoothly expanded and retracted.

Drawings

Figure 1 is an assembly drawing of the present invention.

Fig. 2 is a top structural view of the present invention.

Detailed Description

The embodiments of the present invention will be further described with reference to the accompanying drawings.

As can be seen from the figure, the embodiment of the utility model comprises an upper joint 1, an unsealing piston 3, a valve ball 4, a connecting sleeve 5, an isolating sleeve 6, an isolating piston 7, an inner pipe 8, a rubber cylinder 9 and a lower joint 10, wherein the rubber cylinder 9 is sleeved outside the inner pipe 8, an upper internal thread of the lower joint 10 is connected with a lower part of the inner pipe 8, the connection part keeps sealed, an upper external thread of the lower joint 10 is connected with a lower part of the rubber cylinder 9, the connection part keeps sealed, a sealing ring is installed on the inner wall and the outer wall of the isolating piston 7, the isolating piston 7 is installed in the isolating sleeve 6, the lower part of the isolating sleeve 6 is connected with an upper part of the rubber cylinder 9, the isolating piston 7 is sleeved on the inner pipe 8, the connection part of the isolating sleeve 6 and the rubber cylinder 9 keeps sealed, the sealing ring installed on the inner wall of the isolating piston 7 seals a gap between the inner wall of the isolating piston 7 and the outer wall of the inner pipe 8, the sealing ring installed on the outer wall of the isolating piston 7 seals a gap between the outer wall of the isolating piston 7 and the inner wall of the isolating sleeve 6, the inner wall of a rubber cylinder 9, the lower inner wall of a spacer sleeve 6, the lower end face of an isolation piston 7 and the outer wall of an inner pipe 8 are enclosed to form a closed annular cavity 6-1, the lower side wall of a connecting sleeve 5 is provided with a valve cavity 5-4, the top end of the valve cavity 5-4 is drilled with a valve hole 5-3, a valve ball 4 is placed in the valve cavity 5-4, the valve ball 4 can be matched and sealed with the lower end of the valve hole 5-3, a connecting hole 5-1 is arranged below the upper thread of the connecting sleeve 5, the side wall of the connecting sleeve 5 is provided with an annular groove 5-2, the annular groove 5-2 is arranged below the connecting hole 5-1, the upper end of the valve hole 5-3 is communicated with the annular groove 5-2, the lower thread of the connecting sleeve 5 is connected with the upper part of the spacer sleeve 6, the connection part keeps sealed, and the middle thread of the connecting sleeve 5 is connected with the upper part of the inner pipe 8, the junction keeps sealed, the valve ball 4 can not deviate from after the connecting sleeve 5 is connected with the isolation sleeve 6 the valve cavity 5-4, the lower end of the unsealing piston 3 is provided with a thimble 3-1 (the thimble 3-1 and the unsealing piston 3 are of a split structure, or can be of an integrated structure, such as a split structure, the thimble 3-1 and the unsealing piston 3 are fixed into a whole, the split structure is generally adopted for processing convenience), the lower part of the unsealing piston 3 is installed in the annular 5-2, the thimble 3-1 penetrates through the valve hole 5-3 to press the valve ball 4 away from the valve hole 5-3, the cross-sectional area of the thimble 3-1 is smaller than the area of the valve hole 5-3, a liquid flow channel is arranged between the thimble 3-1 and the valve hole 5-3, and a sealing ring is arranged in the gap between the outer wall of the unsealing piston 3 and the outer circular surface of the annular 5-2 And sealing, so that liquid at the lower end of the unsealing piston 3 cannot flow out through a gap between the upper end of the unsealing piston and the lower end of the unsealing piston 3, wherein the lower part of the upper joint 1 is connected with the upper thread of the connecting sleeve 5, the outer wall of the lower part of the upper joint 1 is inserted into the upper part of the unsealing piston 3, and a sealing ring is arranged between the outer wall of the lower part of the upper joint 1 and the inner wall of the upper part of the unsealing piston 3 and seals the gap between the outer wall of the lower part of the upper joint 1 and the inner wall of the upper part of the unsealing piston 3. The deblocking piston 3 is connected to the upper joint 1 through the shear pin 2, so that the deblocking piston 3 is fixed before the lower well is not pressed into the pipe column.

When the utility model is assembled, the anticorrosion liquid is injected into the annular cavity 6-1. When the thimble 3-1 does not press the valve ball 4, the valve ball 4 can block the valve hole 5-3 (generally, a spring is arranged below the valve hole 5-3 to realize that the valve ball 4 blocks the valve hole 5-3, and the valve ball 4 can also block the valve hole 5-3 by utilizing buoyancy), the valve cavity 5-4 is communicated with the upper end of the isolation piston 7 (the lower end of the valve cavity 5-4 is provided with a baffle plate with a hole), and the pressure in the inner pipe 8 can be transmitted to the upper end of the isolation piston 7 through the connecting hole 5-1.

When the water injection pipe column is lowered to a designed position for water injection, injected water is transmitted to the lower part of the deblocking piston 3 through the communicating hole 5-1, the lower part of the deblocking piston 3 bears injection pressure, the upper part of the deblocking piston 3 bears casing pressure, the injection pressure is larger than the casing pressure at the moment, the deblocking piston 3 bears upward thrust, the shear pin 2 is sheared off, the deblocking piston 3 moves upward, the injected water is transmitted to the isolating piston 7 through the valve hole 5-3, the isolating piston 7 moves downward to reduce the upper volume of the annular cavity 6-1, the rubber cylinder 9 is expanded and tightly attached to the inner wall of the casing, and a water injection layer is isolated to realize layered water injection.

When the injection is stopped, the thimble 3-1 does not press the valve ball 4, the valve ball 4 moves upwards under the action of spring force or buoyancy force to block the valve hole 5-3, the rubber cylinder 9 cannot shrink, and the rubber cylinder 9 cannot shrink and expand repeatedly to be damaged. During the deblocking, the well is washed to the back, and the pressure of washing the well is used in 3 upper portions of deblocking piston, promotes deblocking piston 3 and descends, and the thimble of 3 lower parts of deblocking piston backs up valve ball 4, makes the pressure decline in the packing element 9, and the packing element is retrieved and is realized the deblocking.

In order to increase the sealing performance of the valve ball 4, a valve seat (fixed) can be arranged at the upper end of the valve cavity 5-4, the outer wall of the valve seat is sealed with the inner wall of the valve cavity 5-4, the inner hole of the arranged valve seat is communicated with the valve hole 5-3, and the valve ball 4 is matched and sealed with the lower port of the arranged valve seat.

Claims

1. The utility model provides an expansion packer, includes top connection (1), deblocking piston (3), valve ball (4), hookup cover (5), isolation sleeve (6), isolation piston (7), inner tube (8), packing element (9), lower clutch (10), packing element (9) suit is outside inner tube (8), the upper portion of lower clutch (10) and the lower part of inner tube (8), the sub-unit connection of packing element (9), characterized by: sealing rings are arranged on the inner wall and the outer wall of the isolation piston (7), the isolation piston (7) is arranged in an isolation sleeve (6), the lower part of the isolation sleeve (6) is connected with the upper part of a rubber cylinder (9), so that the isolation piston (7) is sleeved on an inner tube (8), the joint of the isolation sleeve (6) and the rubber cylinder (9) keeps sealed, a sealing ring arranged on the inner wall of the isolation piston (7) seals a gap between the inner wall of the isolation piston (7) and the outer wall of the inner tube (8), a sealing ring arranged on the outer wall of the isolation piston (7) seals a gap between the outer wall of the isolation piston (7) and the inner wall of the isolation sleeve (6), the inner wall of the rubber cylinder (9), the lower inner wall of the isolation sleeve (6), the lower end face of the isolation piston (7) and the outer wall of the inner tube (8) form a sealed annular cavity (6-1), a valve cavity (5-4) is arranged on the lower side wall of the connecting sleeve (5), the valve cavity (5-4) is drilled with a valve hole (5-3) at the top end, a valve ball (4) is placed in the valve cavity (5-4), the valve ball (4) can be matched and sealed with the lower end of the valve hole (5-3), a connecting through hole (5-1) is arranged below the upper thread of a connecting sleeve (5), an annular groove (5-2) is arranged on the side wall of the connecting sleeve (5), the upper end of the valve hole (5-3) is communicated with the annular groove (5-2), the lower thread of the connecting sleeve (5) is connected with the upper part of a spacer sleeve (6), the joint keeps sealed, the middle thread of the connecting sleeve (5) is connected with the upper part of an inner pipe (8), the joint keeps sealed, the valve ball (4) cannot be separated from the valve cavity (5-4) after the connecting sleeve (5) is connected with the spacer sleeve (6), the lower end of a release piston (3) is provided with a thimble (3-1), the lower part of deblocking piston (3) is installed annular (5-2) in, thimble (3-1) pass valve hole (5-3) press valve ball (4) and leave valve hole (5-3), the cross-sectional area of thimble (3-1) be less than the area of valve hole (5-3), make thimble (3-1) with valve hole (5-3) between have a liquid flow channel, the outer wall of deblocking piston (3) with the clearance between the outside circular face of annular (5-2) have the sealing washer sealed, make the liquid of deblocking piston (3) lower extreme can not flow out through the clearance between the two, the last threaded connection of the lower part of top connection (1) and hookup cover (5), the outer wall of top connection (1) inserts in the upper portion of deblocking piston (3), a sealing ring is arranged between the outer wall of the lower part of the upper joint (1) and the inner wall of the upper part of the unsealing piston (3), and the sealing ring seals a gap between the outer wall of the lower part of the upper joint (1) and the inner wall of the upper part of the unsealing piston (3).

2. The expandable packer of claim 1, wherein: the unsealing piston (3) is connected to the upper connector (1) through a shear pin (2).