CN109779569B - Water and gas injection one-way device - Google Patents
Water and gas injection one-way device Download PDFInfo
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- CN109779569B CN109779569B CN201910234569.7A CN201910234569A CN109779569B CN 109779569 B CN109779569 B CN 109779569B CN 201910234569 A CN201910234569 A CN 201910234569A CN 109779569 B CN109779569 B CN 109779569B
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Abstract
A water injection and gas injection one-way device comprises a tubular upper joint, a tubular lower joint and a valve body assembly, wherein the valve body assembly comprises a tubular valve body container and a plurality of one-way valves; counter bores which are the same as the number of the one-way valves and are used for accommodating the one-way valves are arranged in the upper pipe wall of the valve body container along the circumferential direction of the upper pipe wall, and the axes of the counter bores are parallel to the axis of the valve body container; the bottom of the counter bore is provided with a first air inlet communicated with a water and gas injection pipeline; the check valve is sequentially provided with a sealing ball seat, a sealing ball, a piston, a spring and a spring seat from bottom to top; a second air inlet hole communicated with the first air inlet hole is formed in the center of the sealing ball seat; the spring seat is fixed at the upper part of the counter bore, and the spring is a compression spring; the valve body container is provided with an annular groove communicated with the counter bore in the axial direction of the valve body container along the middle part of the counter bore in the axial direction, and the width of the annular groove in the axial direction of the valve body container is smaller than the radius of the sealing ball.
Description
Technical Field
The invention relates to a water and gas injection one-way device, in particular to a water and gas injection one-way valve for establishing multi-cycle access of an oil-gas well, and belongs to the technical field of oil field processes.
Background
At present, the technology for improving the recovery ratio by gas injection and water injection of a tower-river fracture-cave oil reservoir enters a popularization and application stage, the crude oil property may become thick after the gas injection of a thin oil well, the thick oil well slips along with the rising of injected water and gas after the gas injection, the thick oil in the well returns to fill a shaft again, and the thin oil doping operation is needed to be conveniently and smoothly carried out at the moment. The conventional well killing sliding sleeve and other downhole tools cannot realize that the downhole water injection and gas injection equipment is opened and closed for many times to communicate with an oil pipe for many times, and the requirement of multiple dilution operation of a pipe column once cannot be met. Therefore, a one-way device suitable for communicating oil pipe operation for multiple times by water injection and gas injection equipment needs to be developed. And the existing water and gas injection device has a complex structure, is very easy to corrode and scale, and blocks the water and gas injection holes to cause the failure of opening the water and gas injection channel.
Disclosure of Invention
In order to make up for the defects in the field, the invention provides the water and gas injection one-way device which has a simple structure, corrosion resistance and good sealing property, has a large flow channel and can be used repeatedly.
The invention is realized by the following technical scheme:
a water and gas injection one-way device comprises a tubular upper joint, a tubular lower joint and a valve body assembly arranged between the upper joint and the lower joint, wherein the upper part of the upper joint is fixedly connected with an upper oil pipe, and the lower part of the lower joint is fixedly connected with a lower oil pipe; the valve body assembly comprises a tubular valve body container and a plurality of one-way valves; counter bores which are the same as the number of the one-way valves and are used for accommodating the one-way valves are arranged in the upper pipe wall of the valve body container along the circumferential direction of the upper pipe wall, and the axes of the counter bores are parallel to the axis of the valve body container; the bottom of the counter bore is provided with a first air inlet communicated with a water and gas injection pipeline; the upper part of the valve body container is fixedly connected with the lower part of the upper joint, and the fixed connecting part of the valve body container is provided with a first sealing ring; the lower part of the valve body container is fixedly connected with the upper part of the lower joint; the check valve is sequentially provided with a sealing ball seat, a sealing ball, a piston, a spring and a spring seat from bottom to top; the sealing ball seat is fixedly connected to the bottom of the counter bore, and a second sealing ring is arranged on a fixed connecting part of the sealing ball seat; a second air inlet hole communicated with the first air inlet hole is formed in the center of the sealing ball seat; the radius of the sealing ball is larger than that of the second air inlet hole; the spring seat is fixed at the upper part of the counter bore, the spring is a compression spring, one end of the compression spring is fixed on the spring seat, and the other end of the compression spring is fixedly connected with the piston; the valve body container is provided with an annular groove in the middle of the counter bore along the axial direction of the valve body container and in the direction towards the axis, the annular groove is communicated with the counter bore, and the width of the annular groove along the axial direction of the valve body container is smaller than the radius of the sealing ball; and under the action of the pre-tightening force of the spring, the center of the sealing ball is positioned at the lower part of the annular groove.
Preferably, the valve body container is provided with a downward inclined trapezoid groove at the first air inlet, the first air inlet is arranged at the right-angle side of the trapezoid groove, and the inclined side of the trapezoid groove is inclined downward along the radial direction of the valve body container.
Preferably, the water and gas injection unidirectional device further comprises an opening device, and the opening device comprises a shearing sleeve, a plurality of shearing pins and a baffle ring, wherein the shearing pins and the baffle ring are arranged along the circumferential outer surface of the shearing sleeve; the shearing sleeve is sleeved outside the valve body assembly and is in contact with the lower end part of the upper joint, and an inward concave annular pressure effect is formed between the upper end part of the shearing pin sleeve and the lower end part of the upper joint; a third sealing ring and a fourth sealing ring are arranged between the inner surface of the shearing sleeve and the outer surface of the valve body assembly; the cutting sleeve at least completely covers the trapezoidal groove; the axis of the shearing pin is perpendicular to the axis of the shearing sleeve, one end of the shearing pin is positioned in the shearing sleeve, and the other end of the shearing pin is positioned in the valve body container; the baffle ring is arranged on the outer side of the fixed connection part of the valve body container and the lower joint; when the shearing pin is sheared, the shearing sleeve slides downwards to the position of the stop ring on the outer surface of the valve body container and exposes out of the trapezoidal groove.
Preferably, the spring seat is fixed on the inner surface of a counter bore of the valve body container by using a plurality of slotted cone-end fastening screws; the axis of the slotted cone end set screw is perpendicular to the axis of the counter bore.
Preferably, rigid contact surfaces are arranged between the sealing ball and the sealing ball seat, between the sealing ball and the counter bore, and between the upper end of the spring seat and the upper joint, and belong to hard surface sealing.
Preferably, the spring seat is of a hollow cylindrical structure, and the spring is of a cylindrical spiral structure.
Preferably, the sealing ball seat is a stepped hollow shaft with a large top and a small bottom, the bottom of a counter bore correspondingly placing the sealing ball seat is a stepped hole with a large top and a small bottom, and a second sealing ring and a fifth sealing ring are respectively arranged at the fixed connection position of the sealing ball seat and the counter bore.
Preferably, the one-way valves are 4 sets and are centrally and symmetrically distributed in the counter bores positioned at the upper part of the valve body container.
Preferably, the number of the shear pins is 6 along the circumferential outer surface of the shear sleeve.
Preferably, the sealing ball is coated with a ceramic material, and at least a portion of the sealing ball seat in contact with the sealing ball is coated with a ceramic material.
Compared with the prior art, the invention has the advantages that:
1. when the water and gas injection one-way device is used, the water and gas injection one-way device is arranged at the upper part of a packer, and a compression spring and a sealing ball of the water and gas injection one-way device can realize the automatic opening and closing of a water and gas injection channel for many times under the action of annular pressure, so that the water and gas injection circulation efficiency can be improved, and the flowability of thick oil can be increased to the maximum extent; the water and gas injection operation can be carried out independently, and the simultaneous operation of water and gas injection and oil extraction can also be carried out without being influenced mutually.
2. The one-way valve of the water and gas injection one-way device adopts a steel ball type sealing ball, has small contact area with a sealing base, flexible action and difficult blockage; and when the check valve assembly is designed to be a plurality of, such as 4, the number of the flow channels for water injection and gas injection and the flow area can be increased, and blockage is further prevented.
3. The water and gas injection one-way device is pre-tightened by the compression spring with the pre-tightening force, so that the device can be timely reset and closed when the annular pressure is reduced, the compression spring is of a cylindrical spiral structure, and the spring seat is of a hollow cylindrical shape and is of a piston structure, so that the sealing ball is stressed more uniformly.
4. The water and gas injection one-way device is provided with a downward inclined trapezoidal groove at the first gas inlet, and the trapezoidal groove prevents sediment from blocking a liquid and gas injection channel and provides a smoother liquid and gas injection channel for the first gas inlet.
5. According to the water injection and gas injection one-way device, rigid contact surfaces are arranged between the sealing ball and the sealing ball seat, between the sealing ball and the counter bore and between the upper end part of the spring seat and the upper joint, and the device belongs to hard surface sealing and is high in erosion resistance.
6. The water injection and gas injection one-way device also comprises an opening device which is used for protecting the water injection and gas injection channel and is convenient to transport and install; when in selection, the shearing pressure of the shearing pin must be 3-5MPa higher than the seal testing pressure of the packer; and when the annular pressure is high enough, the shearing pin is sheared, the shearing sleeve automatically slides downwards, the annular injection fluid enters the first air inlet hole and the second air inlet hole, the sealing ball is pushed to move upwards, and the water injection and gas injection channel is opened.
7. According to the water and gas injection one-way device, the sealing ball and the sealing ball seat are coated with ceramic materials, so that the erosion resistance, the corrosion resistance and the scaling resistance are realized, and the service life of equipment is prolonged.
Drawings
FIG. 1 is a schematic structural view of an embodiment of a water and gas injection one-way device according to the present invention;
FIG. 2 is a partial enlarged view of a check valve in accordance with an embodiment of the water/gas injection check device of the present invention.
The various reference numbers in the figures are listed below:
1-upper joint; 2-valve body assembly; 3-lower joint;
21-valve body container; 22-a one-way valve;
211-counter bore; 212 — first intake ports; 213-trapezoidal groove; 214-an annular groove;
221-sealing ball seat; 222-a sealing ball; 223-a piston; 224-a spring; 225-spring seat; 226-slotted cone end set screw;
221 a-second intake port;
4-a first sealing ring; 5-a second sealing ring; 51-fifth sealing ring
6-opening the device;
61-a shearing sleeve; 62-a shear pin; 63-a baffle ring;
7-function of annular air pressure; 8-third sealing ring; 9-fourth seal ring.
Detailed Description
In order to facilitate an understanding of the invention, the invention is described in more detail below with reference to the accompanying drawings and specific examples. The preferred embodiments of the present invention are set forth in the specification and drawings, however, the present invention may be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items. Meanwhile, directional terms used in the present invention, such as "up", "down", "front", "back", "left", "right", "inside", "outside", "side", and the like, refer to directions of the drawings of the specification only. Accordingly, the directional terms used are used for explanation and understanding of the present invention, and are not used for limiting the present invention.
The invention is further described below with reference to the figures and examples.
A water and gas injection one-way device is shown in figures 1 and 2 and comprises a tubular upper joint 1, a tubular lower joint 3 and a valve body assembly 2 arranged between the upper joint 1 and the lower joint 3, wherein the upper part of the upper joint 1 is fixedly connected with an upper oil pipe, and the lower part of the lower joint 3 is fixedly connected with a lower oil pipe; specifically, the fixed connection is a pipe threaded connection or other fixed connection. The valve body assembly 2 comprises a tubular valve body container 21 and a plurality of one-way valves 22; the upper pipe wall of the valve body container 21 is internally provided with the same number of counter bores 211 as the number of the one-way valves 22 along the circumferential direction thereof for accommodating the one-way valves 22, and the axes of the counter bores 211 are parallel to the axis of the valve body container 21; the bottom of the counter bore 211 is provided with a first air inlet hole 212 communicated with a water injection and air injection pipeline; the upper part of the valve body container 21 is fixedly connected with the lower part of the upper joint 1, and the fixed connection part is provided with a first sealing ring 4; the lower part of the valve body container 21 is fixedly connected with the upper part of the lower joint 3; the check valve 22 is provided with a sealing ball seat 221, a sealing ball 222, a piston 223, a spring 224 and a spring seat 225 in sequence from bottom to top; the sealing ball seat 221 is fixedly connected to the bottom of the counter bore 211, and a fixed connection part of the sealing ball seat is provided with a second sealing ring 5; a second air inlet hole 221a communicated with the first air inlet hole 212 is formed in the center of the sealing ball seat 221; the radius of the sealing ball 222 is greater than that of the second intake hole 221 a; the check valve 22 adopts a steel ball type sealing ball 222, has small contact area with the sealing ball seat 221, is flexible in action and is not easy to block. The spring seat 225 is fixed on the counter bore 211, the spring 224 is a compression spring, one end of the spring is fixed on the spring seat 225, the other end of the spring is fixedly connected with the piston 223, and the spring is pre-tightened by the compression spring with pre-tightening force, so that the sealing ball 222 can be timely reset and closed under the action of the pre-tightening force of the spring and the self-pressure when the annular pressure is reduced.
The valve body container 21 is provided with an annular groove 214 in the middle of the counter bore 211 along the axial direction thereof, the annular groove 214 faces the axial direction, the annular groove 214 is communicated with the counter bore 211, and the width of the annular groove 214 along the axial direction of the valve body container 21 is smaller than the radius of the sealing ball 222; the counterbore 211 seals the ball 222 with its center at the lower portion of the annular groove 214 under the biasing force of the spring 224.
When the water and gas injection one-way device is used, the water and gas injection one-way device is arranged at the upper part of a packer, and a sealing ball of the water and gas injection one-way device can realize the automatic opening and closing of a water and gas injection channel for multiple times under the action of annular pressure and a compression spring 223, so that the water and gas injection circulation efficiency can be improved, and the flowability of thick oil can be increased to the maximum extent; the water and gas injection operation can be carried out independently, and the simultaneous operation of water and gas injection and oil extraction can also be carried out without being influenced mutually. Specifically, when the annular pressure is greater than the preload of the compression spring 224 and the weight of the sealing ball 222 and the piston 223, the sealing ball 222 pushes the piston 223 to move upward, and when the sealing ball 222 moves to the upper part of the annular groove 214, the water injection and gas injection channel is opened, and fluid enters the pipeline from the outside through the first gas inlet hole 212, the second gas inlet hole 221a and the annular groove 214. When the annular pressure drops and is lower than the pretightening force of the compression spring 224 and the gravity of the sealing ball 222 and the piston 223, the sealing ball 222 moves downwards under the action of the spring 224 and the piston 223 to block the second air inlet hole 221a, and a water injection and gas injection cycle is completed.
Preferably, the valve body container 21 is provided with a downward inclined trapezoidal groove 213 at the first air inlet hole 212, the first air inlet hole 212 is provided at the right-angle side of the trapezoidal groove 213, the inclined side of the trapezoidal groove 213 is inclined downward along the radial direction of the valve body container, and the trapezoidal groove prevents the liquid and gas injection channel from being blocked by the deposit, so as to provide a smoother liquid and gas injection channel for the first air inlet hole.
Preferably, the water and gas injection one-way device further comprises an opening device 6 for protecting the water and gas injection channel, so that the water and gas injection one-way device is convenient to transport and install; the opening device 6 comprises a shearing sleeve 61, a plurality of shearing pins 62 and a stop ring 63, wherein the shearing pins 62 and the stop ring 63 are arranged along the circumferential outer surface of the shearing sleeve 61; the shearing sleeve 61 is sleeved outside the valve body assembly 2 and is in contact with the lower end part of the upper joint 1, and a concave annular pressure action part 7 is formed between the upper end part of the shearing pin sleeve 61 and the lower end part of the upper joint 1; the cutting sleeve 61 at least completely covers the trapezoidal groove 213; the axis of the shearing pin 62 is perpendicular to the axis of the shearing sleeve 61, and one end of the shearing pin is positioned in the shearing sleeve 61, and the other end of the shearing pin is positioned in the valve body container 21; the baffle ring 63 is arranged at the outer side of the fixed connection part of the valve body container 21 and the lower joint 3; when the annular pressure is high enough, the shearing pin 62 is sheared by the annular pressure, the shearing sleeve 61 automatically slides downwards on the outer surface of the valve body container 21 to the stop ring 63, the trapezoidal groove 213 is exposed, the annular injection fluid enters the first air inlet hole and the second air inlet hole, the sealing ball is pushed to move upwards, and the water injection and air injection channel is opened.
Preferably, a third sealing ring 8 and a fourth sealing ring 9 are arranged between the inner surface of the shearing sleeve 61 and the outer surface of the valve body assembly 2.
Preferably, the spring seat 225 is secured to the inner surface of the counterbore 211 of the valve body receptacle 21 using a plurality of slotted cone end set screws 226; the axis of the slotted cone set screw 226 is perpendicular to the axis of the counterbore 211.
Preferably, rigid contact surfaces are formed between the sealing ball 222 and the sealing ball seat 221, between the sealing ball 222 and the counterbore 211, and between the upper end of the spring seat 225 and the upper joint 1, and the rigid contact surfaces are hard surface sealing, so that the erosion resistance is high.
Preferably, the spring seat 225 is a hollow cylindrical structure, the spring 224 is a cylindrical spiral structure, and a piston structure is adopted to act on the sealing ball, so that the force applied to the sealing ball is more uniform.
Preferably, the sealing ball seat 221 is a stepped hollow shaft with a large top and a small bottom, the bottom of the counter bore 211 where the sealing ball seat 221 is correspondingly placed is a stepped hole with a large top and a small bottom, and the fixed connection between the two is provided with the second sealing ring 5 and the fifth sealing ring 51 respectively.
Preferably, the four check valves 22 are centrally and symmetrically distributed in the counter bore 211 at the upper part of the valve body container 21, so that the number of flow channels and the flow area for water injection and gas injection are increased well, and blocking is further prevented.
Preferably, the number of the shear pins 62 is 6 along the circumferential outer surface of the shear sleeve 61, so as to provide sufficient protection for transportation and installation of the water and gas injection one-way device, ensure sufficient water and gas injection pressure for opening a water and gas injection channel of the water and gas injection one-way device, and prevent backflow of oil in an oil pipe.
Preferably, the sealing ball 222 is coated with a ceramic material, and at least the portion of the sealing ball seat 221, which is in contact with the sealing ball 222, is coated with a ceramic material, so that the sealing ball seat is erosion-resistant, non-corrosive, and not easy to scale, and the service life of the equipment is prolonged.
It should be noted that the above-described embodiments may enable those skilled in the art to more fully understand the present invention, but do not limit the present invention in any way. Therefore, although the present invention has been described in detail with reference to the drawings and examples, it will be understood by those skilled in the art that various changes and modifications can be made therein without departing from the spirit and scope of the invention.
Claims (14)
1. The water and gas injection one-way device is characterized by comprising a tubular upper joint, a tubular lower joint and a valve body assembly arranged between the upper joint and the lower joint, wherein the upper part of the upper joint is fixedly connected with an upper oil pipe, and the lower part of the lower joint is fixedly connected with a lower oil pipe;
the valve body assembly comprises a tubular valve body container and a plurality of one-way valves arranged in the valve body container;
counter bores which are the same as the number of the one-way valves and are used for accommodating the one-way valves are arranged in the upper pipe wall of the valve body container along the circumferential direction of the upper pipe wall, and the axes of the counter bores are parallel to the axis of the valve body container; the bottom of the counter bore is provided with a first air inlet communicated with a water and gas injection pipeline;
the upper part of the valve body container is fixedly connected with the lower part of the upper joint, and the fixed connecting part of the valve body container is provided with a first sealing ring; the lower part of the valve body container is fixedly connected with the upper part of the lower joint;
the check valve is sequentially provided with a sealing ball seat, a sealing ball, a piston, a spring and a spring seat from bottom to top;
the sealing ball seat is fixedly connected to the bottom of the counter bore, and a second sealing ring is arranged on a fixed connecting part of the sealing ball seat;
a second air inlet hole communicated with the first air inlet hole is formed in the center of the sealing ball seat; the radius of the sealing ball is larger than that of the second air inlet hole;
the spring seat is fixed at the upper part of the counter bore, the spring is a compression spring, one end of the compression spring is fixed on the spring seat, and the other end of the compression spring is fixedly connected with the piston;
the valve body container is provided with an annular groove in the middle of the counter bore along the axial direction of the valve body container and in the direction towards the axis, the annular groove is communicated with the counter bore, and the width of the annular groove along the axial direction of the valve body container is smaller than the radius of the sealing ball; and under the action of the pre-tightening force of the spring, the center of the sealing ball is positioned at the lower part of the annular groove.
2. The water and gas injection check device as claimed in claim 1, wherein the valve body container is opened at the first gas inlet hole with a trapezoidal groove having a shape of a right trapezoid inclined downward, the first gas inlet hole is opened at a right-angled side of the trapezoidal groove, and an inclined side of the trapezoidal groove is inclined downward along a radially outer side of the valve body container.
3. The water and gas injection unidirectional device according to claim 2, further comprising an opening device, wherein the opening device comprises a shearing sleeve, a plurality of shearing pins and a baffle ring, and the shearing pins and the baffle ring are arranged along the circumferential outer surface of the shearing sleeve; the shearing sleeve is sleeved outside the valve body assembly and is in contact with the lower end part of the upper connector, and an inward concave annular pressure effect is formed between the upper end part of the shearing sleeve and the lower end part of the upper connector; a third sealing ring and a fourth sealing ring are arranged between the inner surface of the shearing sleeve and the outer surface of the valve body assembly; the cutting sleeve at least completely covers the trapezoidal groove; the axis of the shearing pin is perpendicular to the axis of the shearing sleeve, one end of the shearing pin is positioned in the shearing sleeve, and the other end of the shearing pin is positioned in the valve body container; the baffle ring is arranged on the outer side of the fixed connection part of the valve body container and the lower joint; when the shearing pin is sheared, the shearing sleeve slides downwards to the position of the stop ring on the outer surface of the valve body container and exposes out of the trapezoidal groove.
4. The water and gas injection check device according to any of claims 1-3, wherein the spring seat is fixed to the inner surface of the counterbore of the valve body container by a plurality of slotted cone-end set screws; the axis of the slotted cone end set screw is perpendicular to the axis of the counter bore.
5. The water injection and gas injection check device according to any one of claims 1 to 3, wherein rigid contact surfaces are formed between the sealing ball and the sealing ball seat, between the sealing ball and the counter bore, and between the upper end of the spring seat and the upper joint, and belong to hard surface sealing.
6. The water and gas injection one-way device according to claim 1 or 2, wherein the spring seat is of a hollow cylindrical structure, and the spring is of a cylindrical spiral structure.
7. The water and gas injection one-way device according to claim 3, wherein the spring seat is of a hollow cylindrical structure, and the spring is of a cylindrical spiral structure.
8. The water and gas injection one-way device according to claim 4, wherein the spring seat is of a hollow cylindrical structure, and the spring is of a cylindrical spiral structure.
9. The water and gas injection one-way device according to claim 5, wherein the sealing ball seat is a stepped hollow shaft with a large top and a small bottom, the bottom of the counter bore corresponding to the sealing ball seat is a stepped hole with a large top and a small bottom, and a second sealing ring and a fifth sealing ring are respectively arranged at the fixed connection position of the sealing ball seat and the counter bore.
10. The water and gas injection one-way device according to claim 6, wherein 4 counter bores are uniformly distributed on the upper part of the valve body container, and the one-way valve is correspondingly arranged in each counter bore.
11. The water injection and gas injection one-way device according to claim 7 or 8, wherein the one-way valve has 4 sets, 4 counter bores are uniformly distributed on the upper part of the valve body container, and the one-way valve is correspondingly arranged in each counter bore.
12. The water and gas injection check device according to claim 7, wherein the number of the shear pins is 6, and the 6 shear pins are uniformly distributed along the circumferential outer surface of the shear sleeve.
13. The water and gas injection one-way device according to claim 6, wherein the sealing ball is coated with a ceramic material, and at least the part of the sealing ball seat, which is in contact with the sealing ball, is coated with a ceramic material.
14. The water and gas injection one-way device according to claim 7 or 8, wherein the sealing ball is coated with a ceramic material, and at least a portion of the sealing ball seat in contact with the sealing ball is coated with a ceramic material.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910234569.7A CN109779569B (en) | 2019-03-26 | 2019-03-26 | Water and gas injection one-way device |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910234569.7A CN109779569B (en) | 2019-03-26 | 2019-03-26 | Water and gas injection one-way device |
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| CN109779569A CN109779569A (en) | 2019-05-21 |
| CN109779569B true CN109779569B (en) | 2020-01-10 |
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| CN111878036A (en) * | 2020-08-05 | 2020-11-03 | 中石化石油工程技术服务有限公司 | Multifunctional fluid one-way injection device and use method thereof |
| CN112267857B (en) * | 2020-09-22 | 2022-11-04 | 中国石油天然气股份有限公司 | Gas injection anti-channeling device, reservoir gas injection pipe column and reservoir gas injection method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| US6505685B1 (en) * | 2000-08-31 | 2003-01-14 | Halliburton Energy Services, Inc. | Methods and apparatus for creating a downhole buoyant casing chamber |
| US20080011487A1 (en) * | 2006-07-13 | 2008-01-17 | Blackhawk Environmental Co. | Drive piston and foot valve seat |
| CN102507096B (en) * | 2011-10-18 | 2014-02-19 | 中国石油化工股份有限公司 | Seal examining method of packer and seal examining device used in method |
| CN203081400U (en) * | 2013-01-23 | 2013-07-24 | 中国石油化工股份有限公司江苏油田分公司 | Double-seal flowback preventing check valve |
| CN107916910B (en) * | 2016-10-10 | 2020-07-17 | 中国石油化工股份有限公司 | Independent hydraulic control packer pressure control valve |
| CN108019171A (en) * | 2017-12-28 | 2018-05-11 | 中国石油集团川庆钻探工程有限公司 | A kind of radial direction pressure relief device for down-hole equipment |
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