CN111878034B - Uniflow valve for downhole tool - Google Patents
Uniflow valve for downhole tool Download PDFInfo
- Publication number
- CN111878034B CN111878034B CN202010722266.2A CN202010722266A CN111878034B CN 111878034 B CN111878034 B CN 111878034B CN 202010722266 A CN202010722266 A CN 202010722266A CN 111878034 B CN111878034 B CN 111878034B
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- valve
- groove
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- cavity
- oil
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Links
- 238000007789 sealing Methods 0.000 claims description 7
- 230000000694 effects Effects 0.000 claims description 5
- 239000007788 liquid Substances 0.000 abstract description 10
- 239000012530 fluid Substances 0.000 description 2
- 238000011010 flushing procedure Methods 0.000 description 2
- 238000010276 construction Methods 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B34/00—Valve arrangements for boreholes or wells
- E21B34/06—Valve arrangements for boreholes or wells in wells
- E21B34/08—Valve arrangements for boreholes or wells in wells responsive to flow or pressure of the fluid obtained
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/10—Geothermal energy
Abstract
The invention discloses a single flow valve for downhole tools, which is arranged between double-layer oil pipe pipelines and comprises: a valve body; plugging; an outer layer uniflow valve; a first spring; an inner layer check valve; and a second spring. The invention has the advantages that: through setting up inlayer uniflow valve and outer uniflow valve, when unexpected condition takes place, inlayer uniflow valve and outer uniflow valve can close simultaneously to can seal double-deck oil pipe's break-make effectively, prevent that well liquid from returning out, avoid taking place the blowout condition.
Description
Technical Field
The invention belongs to the technical field of downhole tools for petroleum extraction, and particularly relates to a single-flow valve for a downhole tool.
Background
When the double-layer continuous oil pipe is operated by the tool, the problems of damage, fracture and the like of the double-layer continuous oil pipe body caused by sudden accidents can be solved, and oil, gas and water in the well can be sprayed out from the inner and outer channels of the broken double-layer continuous oil pipe to cause blowout accidents. Therefore, it is necessary to install a single flow valve for double-layer coiled tubing which can effectively close the passage of the inner and outer layers of coiled tubing when unexpected situations occur and prevent blowout.
Disclosure of Invention
In view of the above, it is desirable to provide a single flow valve for a downhole tool that can effectively close the passage of the inner and outer coiled tubing when an unexpected situation occurs, thereby preventing the well fluid from flowing back out and preventing the occurrence of a blowout accident.
The invention discloses a single flow valve for downhole tools, which is arranged between double-layer oil pipe pipelines and comprises: the valve body is characterized in that a first left threaded hole and a first right threaded hole which are used for connecting an outer tube of the double-layer oil tube are formed at two ends of the valve body respectively, a second left threaded hole which is used for connecting an inner tube of the double-layer oil tube is formed in the middle of the bottom surface of the first left threaded hole, a connecting cavity which is communicated with the second left threaded hole is formed in the bottom surface of the first right threaded hole, and a first oil through groove which is communicated with the connecting cavity is formed in the periphery of the second left threaded hole; the screw plug is in threaded connection with the right end of the inside of the connecting cavity, a center circular groove and an annular circular groove which are communicated with the connecting cavity and concentric with each other are formed in the middle of the left end of the screw plug, a second right threaded hole which is used for connecting the inner pipe of the double-layer oil pipe and is communicated with the center circular groove is formed in the middle of the right end of the screw plug, and a second oil through groove communicated with the annular circular groove is formed in the position, around the second right threaded hole, of the right end face of the screw plug; the outer layer uniflow valve is connected to the valve body and the annular circular groove in a sliding mode, a right cavity is formed between the outer layer uniflow valve and the valve body and between the outer layer uniflow valve and the plug, a first through hole is formed between the right cavity and the central circular groove, a first annular oil groove which is communicated with the second oil through groove and is used for being communicated with the first oil through groove is formed in the outer side face of the outer layer uniflow valve, and an annular raised line is fixedly connected to the left side of the first annular oil groove; the inner single-flow valve is connected in a sliding manner in the outer single-flow valve and the connecting cavity, the inner cavity of the inner single-flow valve is communicated with the central circular groove, a plurality of second through holes communicated with the inner cavity of the inner single-flow valve are formed in the conical valve core of the inner single-flow valve, a second annular oil groove is formed in the outer side surface of the inner single-flow valve and is communicated with the first through oil groove through a third through oil groove, a left cavity is formed among the inner single-flow valve, the outer single-flow valve and the valve body, after the inner single-flow valve moves rightwards, the second annular oil groove can enable the first through oil groove to be communicated with the left cavity, and a plurality of third through holes capable of being communicated with the inner cavity of the inner single-flow valve and the left cavity are formed in the outer side surface of the inner single-flow valve; the first spring is abutted to the bottom surface of the connecting cavity, one end of the first spring is abutted to the left side surface of the annular raised line, the first spring is sleeved on the outer side surface of the outer layer uniflow valve, when the pressure between the left cavity and the right cavity is equal, the first spring can drive the outer layer uniflow valve to move rightwards under the action of elasticity of the first spring until the annular raised line is abutted to the left end surface of the screw plug, so that the first annular oil groove is disconnected from the first oil through groove, and when the pressure of the left cavity is lower than that of the right cavity, the outer layer uniflow valve can be driven to move leftwards, so that the first annular oil groove is communicated with the first oil through groove; one end of the second spring is abutted to the inner cavity wall of the inner layer uniflow valve, the other end of the second spring is abutted to the bottom surface of the central circular groove, and the second spring is used for driving the inner layer uniflow valve to move leftwards so that the second left threaded hole is disconnected with the central circular groove.
In one embodiment, the connecting cavity is provided with a first annular step, a second annular step, a third annular step and a fourth annular step from left to right in sequence, the first annular step is used for being matched with a conical valve core of the inner-layer uniflow valve to disconnect the second left threaded hole and the central circular groove, the left cavity is located between the second annular step and the left end face of the outer-layer uniflow valve, and the fourth annular step is abutted with the left end face of the plug to limit the position of the plug.
In one embodiment, the cross section of the first annular oil groove is in an inverted trapezoid shape, the right end inclined plane of the annular raised line is connected with the left end inclined plane of the first annular oil groove, and the cross sections of the right end inclined planes and the left end inclined plane of the annular raised line are located on the same straight line.
In one embodiment, sealing rings are arranged between the plug and the valve body, between the outer layer uniflow valve and the valve body and between the plug and the outer layer uniflow valve to form a sealing effect.
In one embodiment, the valve body is cylindrical, and the outer diameter of the valve body is the same as the outer diameter of the connected double-layer oil pipe.
The technical scheme has the advantages that:
1. according to the invention, the inner-layer check valve and the outer-layer check valve are arranged, so that when unexpected situations occur, the inner-layer check valve and the outer-layer check valve can be closed at the same time, thereby effectively closing the on-off of the double-layer oil pipe, preventing well fluid from returning out and avoiding blowout situations;
2. the invention has the advantages of simple and compact structure, low opening pressure of the inner single-flow valve connected with the outer single-flow valve, high bearing pressure and safe and reliable construction operation;
3. the inner single-flow valve and the outer single-flow valve are communicated by the liquid flow path, so that the inner single-flow valve and the outer single-flow valve are opened and closed simultaneously, and mechanical connection is not needed.
Drawings
FIG. 1 is a cross-sectional view of the present invention with the inner and outer check valves in a closed position;
FIG. 2 is a cross-sectional view of the present invention in an operational state where the inner layer is injected into the outer tube and returned;
FIG. 3 is a cross-sectional view of a valve body of the present invention;
fig. 4 is a cross-sectional view of a plug in accordance with the present invention.
In the figure, a valve body 1, a first left screw hole 11, a first right screw hole 12, a second left screw hole 13, a second right screw hole 14, a first oil passing groove 15, a second oil passing groove 16, a third oil passing groove 17, a connecting cavity 18, a first annular step 181, a second annular step 182, a third annular step 183, a fourth annular step 184, an inner check valve 2, a second through hole 21, a central circular groove 22, a second annular oil groove 23, a third through hole 24, an annular circular groove 25, a plug 3, a first through hole 31, a first spring 4, an outer check valve 5, a left chamber 5a, a right chamber 5b, a first annular oil groove 51, an annular convex strip 52, a second spring 6, and a seal ring 7.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
It will be understood that when an element is referred to as being "mounted" to another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "disposed on" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "secured to" another element, it can be directly secured to the other element or intervening elements may also be present.
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 herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "or/and" as used herein includes any and all combinations of one or more of the associated listed items.
As shown in fig. 1, 2, 3 and 4, the present invention discloses a single flow valve for downhole tools, which is disposed between double-layer tubing lines, and comprises: the valve comprises a valve body 1, wherein a first left threaded hole 11 and a first right threaded hole 12 for connecting an outer tube of a double-layer oil tube are respectively formed at two ends of the valve body 1, a second left threaded hole 13 for connecting an inner tube of the double-layer oil tube is formed in the middle of the bottom surface of the first left threaded hole 11, a connecting cavity 18 communicated with the second left threaded hole 13 is formed in the bottom surface of the first right threaded hole 12, and a first oil through groove 15 communicated with the connecting cavity 18 is formed in the bottom surface of the first left threaded hole 11 and around the second left threaded hole 13; the screw plug 3 is in threaded connection with the right end of the inside of the connecting cavity 18, a center circular groove 22 and an annular circular groove 25 which are communicated with the connecting cavity 18 and concentric with each other are formed in the middle of the left end of the screw plug 3, a second right threaded hole 14 which is used for connecting the inner pipe of the double-layer oil pipe and is communicated with the center circular groove 22 is formed in the middle of the right end of the screw plug 3, and a second oil through groove 16 which is communicated with the annular circular groove 25 is formed around the second right threaded hole 14 in the right end face of the screw plug 3; the outer layer uniflow valve 5 is slidably connected to the valve body 1 and the annular circular groove 25, a right cavity 5b is formed between the outer layer uniflow valve 5 and the valve body 1 and between the outer layer uniflow valve 5 and the plug 3, a first through hole 31 is formed between the right cavity 5b and the central circular groove 22, a first annular oil groove 51 which is communicated with the second oil through groove 16 and is used for being communicated with the first oil through groove 15 is formed on the outer side surface of the outer layer uniflow valve 5, and an annular raised strip 52 is fixedly connected to the left side of the first annular oil groove 51; the inner single-flow valve 2 is slidably connected in the outer single-flow valve 5 and the connecting cavity 18, the inner cavity of the inner single-flow valve 2 is communicated with the central circular groove 22, a plurality of second through holes 21 communicated with the inner cavity of the inner single-flow valve 2 are formed in the conical valve core of the inner single-flow valve 2, a second annular oil groove 23 is formed in the outer side surface of the inner single-flow valve 2, the second annular oil groove 23 is communicated with the first oil through groove 15 through a third oil through groove 17, a left cavity 5a is formed among the inner single-flow valve 2, the outer single-flow valve 5 and the valve body 1, when the inner single-flow valve 2 moves rightwards, the second annular oil groove 23 can enable the first oil through groove 15 to be communicated with the left cavity 5a, and a plurality of third through holes 24 capable of communicating the inner cavity of the inner single-flow valve 2 with the left cavity 5a are formed in the outer side surface of the inner single-flow valve 2; the first spring 4, one end of which is abutted against the bottom surface of the connecting cavity 18, the other end of which is abutted against the left side surface of the annular raised strip 52, and the first spring 4 is sleeved on the outer side surface of the outer check valve 5, when the pressure between the left chamber 5a and the right chamber 5b is equal, the first spring 4 can drive the outer check valve 5 to move rightward until the annular raised strip 52 is abutted against the left end surface of the plug 3, so that the first annular oil groove 51 is disconnected from the first oil groove 15, and when the pressure of the left chamber 5a is lower than the pressure of the right chamber 5b, the outer check valve 5 can be driven to move leftward, so that the first annular oil groove 51 is communicated with the first oil groove 15; one end of the second spring 6 is abutted to the inner cavity wall of the inner layer uniflow valve 2, the other end of the second spring 6 is abutted to the bottom surface of the central circular groove 22, and the second spring 6 is used for driving the inner layer uniflow valve 2 to move leftwards so as to disconnect the second left threaded hole 13 from the central circular groove 22.
It should be noted that, when the outer layer check valve 5 is in the position shown in fig. 1, the left chamber 5a is communicated with the central circular groove 22 through the third through hole 24, the right chamber 5b is communicated with the central circular groove 22 through the first through hole 31, and at this time, the pressures between the left chamber 5a and the right chamber 5b are equal to the pressure in the central circular groove 22, and the action areas are equal, so that the outer layer check valve 5 can be driven to move to the right end position under the action force of the first spring 4, thereby disconnecting the second oil through groove 16 from the first oil through groove 15; when the outer layer uniflow valve 5 is in the position shown in fig. 2, the left chamber 5a is communicated with the first oil passing groove 15 through the second annular oil groove 23 and the third oil passing groove 17, and the first oil passing groove 15 is positioned downstream of the central circular groove 22, that is, the pressure of the first oil passing groove 15 is lower than the pressure of the central circular groove 22, at this time, the pressure of the left chamber 5a is lower than the pressure of the right chamber 5b, so that the outer layer uniflow valve 5 moves leftwards under the action of the pressure difference, so that the second oil passing groove 16 is communicated with the first oil passing groove 15.
It will be appreciated that the right chamber 5b is located between the outer layer uniflow valve 5 and the bottom surface of the annular groove 25.
Preferably, as shown in fig. 3, the connecting cavity 18 is provided with a first annular step 181, a second annular step 182, a third annular step 183 and a fourth annular step 184 in sequence from left to right, the first annular step 181 is used for being matched with a conical valve core of the inner single flow valve 2 to disconnect the second left threaded hole 13 and the central circular groove 22, the left cavity 5a is located between the second annular step 182 and the left end face of the outer single flow valve 5, and the fourth annular step 184 is abutted against the left end face of the plug 3 to limit the position of the plug 3.
It can be appreciated that, as shown in fig. 1 and 3, the distance between the first annular step 181 and the left end surface of the plug 3 is greater than the overall length of the inner check valve 2, so that the inner check valve 2 moves left and right, thereby achieving the effect of controlling on-off.
Preferably, as shown in fig. 2, the cross section of the first annular oil groove 51 is in an inverted trapezoid shape, the right end inclined plane of the annular raised strip 52 is connected with the left end inclined plane of the first annular oil groove 51, and the cross sections thereof are located on the same straight line.
Preferably, as shown in fig. 1 and 3, sealing rings 7 are provided between the plug 3 and the valve body 1, between the outer layer check valve 5 and the valve body 1, and between the plug 3 and the outer layer check valve 5 to form a sealing effect.
Preferably, as shown in fig. 3, the valve body 1 is cylindrical, and the outer diameter of the valve body 1 is the same as the outer diameter of the connected double-layer oil pipe.
The working mode of the invention is as follows: FIG. 2 is a schematic view showing the circulation working state of the invention that the inner pipe is injected into the outer pipe and returned out. When the operation is carried out, when the well flushing liquid is continuously injected into the bottom of the well through the inner layer oil pipe, the liquid in the inner layer oil pipe enters the inlet of the inner layer uniflow valve 2 after passing through the second left threaded hole 13, and under the action of hydraulic pressure, the cone valve core of the inner layer uniflow valve 2 moves towards the bottom of the well, and the liquid flows to the second right threaded hole 14 through the second left threaded hole 13, the second through hole 21 and the central circular groove 22; after the inner layer uniflow valve 2 moves rightwards, the left cavity 5a is communicated with the first oil through groove 15 through the second annular oil groove 23, the outer layer uniflow valve 5 moves leftwards to be opened under the action of pressure difference, when the inner layer uniflow valve 2 and the outer layer uniflow valve 5 are both opened, well flushing liquid flows into a well through the inner layer uniflow valve 2, finally, liquid returned from the bottom of the well can flow out of an oil pipe through the first oil through groove 15 after passing through the outer layer uniflow valve 5, inner pipe injection and outer pipe return are realized, and circulation of liquid flow between the inner pipe and the outer pipe of the double-layer continuous oil pipe is formed.
When the double-layer coiled tubing above the valve body 1 breaks due to an unexpected event, and the bottom hole pressure is higher than the in-pipe pressure at the upper end of the valve body 1, as shown in fig. 1, under the combined action of the second spring 6 and the liquid flow, the inner single-flow valve 2 moves leftwards to close the valve port, namely the second left threaded hole 13 is disconnected with the central circular groove 22, and the inner single-flow valve 2 moves leftwards to enable the left cavity 5a to be communicated with the central circular groove 22 again through the third threaded hole 24, so that the pressures in the left cavity 5a and the right cavity 5b are equal, and under the action of the first spring 4, the outer single-flow valve 5 moves rightwards to close the valve port, namely the second oil through groove 16 is disconnected with the first oil through groove 15, and at the moment, the inner single-flow valve 2 and the outer single-flow valve 5 are both closed, so that the inner single-flow valve and the outer continuous oil pipe channels can be effectively closed simultaneously, the liquid and the gas at the bottom of the well can be prevented from flowing backwards, and the sealing effect can be effectively prevented from blowout.
The technical features of the above-described embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above-described embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.
The above examples illustrate only a few embodiments of the invention, which are described in detail and are not to be construed as limiting the scope of the invention. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the invention, which are all within the scope of the invention. Accordingly, the scope of protection of the present invention is to be determined by the appended claims.
Claims (4)
1. A single flow valve for a downhole tool disposed between double tubing lines, comprising:
the valve body is characterized in that a first left threaded hole and a first right threaded hole which are used for connecting an outer tube of the double-layer oil tube are formed at two ends of the valve body respectively, a second left threaded hole which is used for connecting an inner tube of the double-layer oil tube is formed in the middle of the bottom surface of the first left threaded hole, a connecting cavity which is communicated with the second left threaded hole is formed in the bottom surface of the first right threaded hole, and a first oil through groove which is communicated with the connecting cavity is formed in the periphery of the second left threaded hole;
the screw plug is in threaded connection with the right end of the inside of the connecting cavity, a center circular groove and an annular circular groove which are communicated with the connecting cavity and concentric with each other are formed in the middle of the left end of the screw plug, a second right threaded hole which is used for connecting the inner pipe of the double-layer oil pipe and is communicated with the center circular groove is formed in the middle of the right end of the screw plug, and a second oil through groove communicated with the annular circular groove is formed in the position, around the second right threaded hole, of the right end face of the screw plug;
the outer layer uniflow valve is connected to the valve body and the annular circular groove in a sliding mode, a right cavity is formed between the outer layer uniflow valve and the valve body and between the outer layer uniflow valve and the plug, a first through hole is formed between the right cavity and the central circular groove, a first annular oil groove which is communicated with the second oil through groove and is used for being communicated with the first oil through groove is formed in the outer side face of the outer layer uniflow valve, and an annular raised line is fixedly connected to the left side of the first annular oil groove;
the inner single-flow valve is connected in a sliding manner in the outer single-flow valve and the connecting cavity, the inner cavity of the inner single-flow valve is communicated with the central circular groove, a plurality of second through holes communicated with the inner cavity of the inner single-flow valve are formed in the conical valve core of the inner single-flow valve, a second annular oil groove is formed in the outer side surface of the inner single-flow valve and is communicated with the first through oil groove through a third through oil groove, a left cavity is formed among the inner single-flow valve, the outer single-flow valve and the valve body, after the inner single-flow valve moves rightwards, the second annular oil groove can enable the first through oil groove to be communicated with the left cavity, and a plurality of third through holes capable of being communicated with the inner cavity of the inner single-flow valve and the left cavity are formed in the outer side surface of the inner single-flow valve;
the first spring is abutted to the bottom surface of the connecting cavity, one end of the first spring is abutted to the left side surface of the annular raised line, the first spring is sleeved on the outer side surface of the outer layer uniflow valve, when the pressure between the left cavity and the right cavity is equal, the first spring can drive the outer layer uniflow valve to move rightwards under the action of elasticity of the first spring until the annular raised line is abutted to the left end surface of the screw plug, so that the first annular oil groove is disconnected from the first oil through groove, and when the pressure of the left cavity is lower than that of the right cavity, the outer layer uniflow valve can be driven to move leftwards, so that the first annular oil groove is communicated with the first oil through groove;
one end of the second spring is abutted against the inner cavity wall of the inner layer uniflow valve, the other end of the second spring is abutted against the bottom surface of the central circular groove, and the second spring is used for driving the inner layer uniflow valve to move leftwards so as to disconnect the second left threaded hole from the central circular groove; the connecting cavity is provided with a first annular step, a second annular step, a third annular step and a fourth annular step from left to right in sequence, the first annular step is used for being matched with a cone valve core of the inner-layer uniflow valve to disconnect the second left threaded hole and the central circular groove, the left cavity is located between the second annular step and the left end face of the outer-layer uniflow valve, and the fourth annular step is abutted to the left end face of the plug to limit the position of the plug.
2. The downhole tool single flow valve according to claim 1, wherein the cross section of the first annular oil groove is inverted trapezoid, the right end inclined surface of the annular convex strip and the left end inclined surface of the first annular oil groove are connected to each other, and the cross sections thereof are positioned on the same straight line.
3. The downhole tool single flow valve according to claim 1, wherein sealing rings are provided between the plug and the valve body, between the outer layer single flow valve and the valve body, and between the plug and the outer layer single flow valve to form a sealing effect.
4. The single flow valve for a downhole tool according to claim 1, wherein the valve body is cylindrical, and the outer diameter of the valve body is the same as the outer diameter of the connected double-layer oil pipe.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010722266.2A CN111878034B (en) | 2020-07-24 | 2020-07-24 | Uniflow valve for downhole tool |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010722266.2A CN111878034B (en) | 2020-07-24 | 2020-07-24 | Uniflow valve for downhole tool |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN111878034A CN111878034A (en) | 2020-11-03 |
| CN111878034B true CN111878034B (en) | 2023-12-12 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010722266.2A Active CN111878034B (en) | 2020-07-24 | 2020-07-24 | Uniflow valve for downhole tool |
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| CN (1) | CN111878034B (en) |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104453754A (en) * | 2014-11-12 | 2015-03-25 | 中国石油天然气股份有限公司 | Two-way passageway check valve and method for conducting sand-flushing through the same |
| CN104806200A (en) * | 2015-04-24 | 2015-07-29 | 中国石油集团渤海钻探工程有限公司 | Plunger-type double-passage different-direction synchronous joint control check valve for double-layer continuous oil pipe |
| CN104929574A (en) * | 2015-04-01 | 2015-09-23 | 中国石油集团渤海钻探工程有限公司 | Dual-channel different-direction joint-control check valve |
| CN205638359U (en) * | 2016-05-19 | 2016-10-12 | 东营市金旺石油机械制造有限公司 | Binary channels side direction single current valve that viscous crude thermal production well was used |
| CN111119791A (en) * | 2019-12-20 | 2020-05-08 | 中海石油(中国)有限公司 | Dual-channel drilling underground floating valve |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7614452B2 (en) * | 2005-06-13 | 2009-11-10 | Schlumberger Technology Corporation | Flow reversing apparatus and methods of use |
-
2020
- 2020-07-24 CN CN202010722266.2A patent/CN111878034B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104453754A (en) * | 2014-11-12 | 2015-03-25 | 中国石油天然气股份有限公司 | Two-way passageway check valve and method for conducting sand-flushing through the same |
| CN104929574A (en) * | 2015-04-01 | 2015-09-23 | 中国石油集团渤海钻探工程有限公司 | Dual-channel different-direction joint-control check valve |
| CN104806200A (en) * | 2015-04-24 | 2015-07-29 | 中国石油集团渤海钻探工程有限公司 | Plunger-type double-passage different-direction synchronous joint control check valve for double-layer continuous oil pipe |
| CN205638359U (en) * | 2016-05-19 | 2016-10-12 | 东营市金旺石油机械制造有限公司 | Binary channels side direction single current valve that viscous crude thermal production well was used |
| CN111119791A (en) * | 2019-12-20 | 2020-05-08 | 中海石油(中国)有限公司 | Dual-channel drilling underground floating valve |
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| Publication number | Publication date |
|---|---|
| CN111878034A (en) | 2020-11-03 |
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Effective date of registration: 20240326 Address after: 163000 Incubator 17, No.1, Phase I Project of Science and Technology Incubator in High tech Zone, Daqing City, Heilongjiang Province Patentee after: Daqing Dongyuan Machinery Manufacturing Co.,Ltd. Country or region after: China Address before: 315000 No. 510 Chuangyuan Road, Ningbo National High-tech Zone, Zhejiang Province Patentee before: Shao Likun Country or region before: China |