CN111894517A - Underground check valve - Google Patents
Underground check valve Download PDFInfo
- Publication number
- CN111894517A CN111894517A CN202010717126.6A CN202010717126A CN111894517A CN 111894517 A CN111894517 A CN 111894517A CN 202010717126 A CN202010717126 A CN 202010717126A CN 111894517 A CN111894517 A CN 111894517A
- Authority
- CN
- China
- Prior art keywords
- layer
- hole
- valve
- communicated
- valve body
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn
Links
- 239000012530 fluid Substances 0.000 claims abstract description 19
- 238000001802 infusion Methods 0.000 claims description 8
- 239000007788 liquid Substances 0.000 description 17
- 230000001502 supplementing effect Effects 0.000 description 12
- 238000011010 flushing procedure Methods 0.000 description 4
- 238000005034 decoration Methods 0.000 description 2
- 238000002347 injection Methods 0.000 description 2
- 239000007924 injection Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000000712 assembly Effects 0.000 description 1
- 238000000429 assembly Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000004519 manufacturing process 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
Images
Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK 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
Landscapes
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Geology (AREA)
- Mining & Mineral Resources (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Check Valves (AREA)
Abstract
The invention discloses an underground check valve which is arranged between double-layer coiled tubing, the right end of the underground check valve is communicated with the bottom of a well, the underground check valve comprises a left valve body, the left end of the left valve body is provided with a left threaded hole connected with outer-layer coiled tubing and a left two threaded hole connected with inner-layer coiled tubing, and a left two through hole communicated with the left threaded hole and a left one through hole communicated with the left two threaded holes are arranged in the left valve body; the right valve body is fixedly installed at the right end of the left valve body, a right threaded hole connected with the outer-layer coiled tubing and a right two threaded holes connected with the inner-layer coiled tubing are formed in the right end of the right valve body, and a right two through hole communicated with the right threaded hole and a right one through hole communicated with the right two threaded holes are formed in the right valve body; an inner-layer valve control assembly and an outer-layer valve control assembly which are mutually related are arranged in the left valve body; the check valve can effectively seal the channels of the inner and outer layers of continuous oil pipes when an unexpected condition occurs, so that well fluid is prevented from returning out, and a blowout accident is prevented.
Description
Technical Field
The invention relates to the technical field of petroleum production downhole tools, in particular to a downhole check valve.
Background
When the double-layer continuous oil pipe is operated with the tool, the problems of breakage, fracture and the like of the pipe body of the double-layer continuous oil pipe caused by sudden accidents can be encountered, and at the moment, the well oil gas water is gushed out from the inner channel and the outer channel of the fractured double-layer continuous oil pipe to cause well blowout accidents. Therefore, a check valve for a double-layer coiled tubing is needed to be installed, which can effectively seal the channel of the inner and outer layers of coiled tubing and prevent blowout when an unexpected situation occurs.
Disclosure of Invention
The invention aims to provide a check valve which can effectively seal the channels of an inner layer of continuous oil pipe and an outer layer of continuous oil pipe when an unexpected condition occurs, so that well fluid is prevented from returning out, and a blowout accident is prevented.
In order to achieve the purpose, the invention provides the following technical scheme:
a downhole check valve is arranged between double-layer coiled tubing, the right end of the downhole check valve is communicated with the bottom of a well, the downhole check valve comprises a left valve body, the left end of the left valve body is provided with a left threaded hole connected with outer-layer coiled tubing and a left threaded hole connected with inner-layer coiled tubing, and a left through hole communicated with the left threaded hole are formed in the left valve body; the right valve body is fixedly installed at the right end of the left valve body, a right threaded hole connected with the outer-layer coiled tubing and a right two threaded holes connected with the inner-layer coiled tubing are formed in the right end of the right valve body, and a right two through hole communicated with the right threaded hole and a right one through hole communicated with the right two threaded holes are formed in the right valve body; the left valve body is internally provided with an inner-layer valve control assembly and an outer-layer valve control assembly which are mutually related, when pressure difference exists between the left through hole and the right through hole and the pressure in any one of the outer continuous oil pipe and the inner continuous oil pipe at the left end of the check valve is not less than bottom hole pressure, the inner-layer valve control assembly and the outer-layer valve control assembly are both opened, the left through hole is communicated with the right through hole, when the bottom hole pressure is greater than the pressures in the outer continuous oil pipe and the inner continuous oil pipe at the left end of the check valve, the inner-layer valve control assembly and the outer-layer valve control assembly are both closed, the left.
Further, the inner valve control assembly comprises an inner valve core and an inner spring, an inner seat hole with an opening at the right end is formed in the left valve body, and the right end of the inner seat hole is communicated with the right through hole; an inner-layer plug hole is formed in the left valve body at the center of the left end of the inner-layer seat hole along the axial direction of the inner-layer seat hole, and the left end of the inner-layer plug hole is communicated with the left through hole; a hollow inner layer plug is fixedly arranged at the right end opening of the inner layer seat hole, an inner layer slotted hole is formed in the left end of the inner layer plug, the left end of the inner layer valve core is slidably connected into the inner layer plug hole, and the right end of the inner layer valve core is slidably connected into the inner layer slotted hole; the left end of the inner-layer valve core is provided with an inner-layer convex column for controlling the on-off of a left through hole, an inner-layer valve cavity is formed between the left end of the inner-layer valve core and the left end of the inner-layer plug hole in the inner-layer plug hole, and an inner-layer oil hole for communicating the inner-layer valve cavity with a right through hole is formed in the inner-layer valve core; the inner spring is positioned between the right end of the inner valve core and the inner plug and used for forcing the inner valve core to move leftwards; the outer side of the inner-layer valve core is provided with an inner-layer convex shoulder which is connected in an inner-layer seat hole in a sliding manner, a left cavity is formed between the inner-layer convex shoulder and the left end of the inner-layer seat hole in the inner-layer seat hole, and a right cavity is formed between the inner-layer convex shoulder and the left end of the inner-layer plug;
the outer-layer valve control assembly comprises an outer-layer valve core and an outer-layer spring, an outer-layer seat hole with an opening at the right end is formed in the left valve body, and the right end of the outer-layer seat hole is communicated with the right through hole; an outer layer plug hole is formed in the left valve body at the center of the left end of the outer layer seat hole along the axial direction of the outer layer seat hole, and the left end of the outer layer plug hole is communicated with the left two through holes; a hollow outer layer plug is fixedly arranged at the right end opening of the outer layer seat hole, an outer layer slotted hole is formed in the left end of the outer layer plug, the left end of the outer layer valve core is connected in the outer layer plug hole in a sliding mode, and the right end of the outer layer valve core is connected in the outer layer slotted hole in a sliding mode; the left end of the outer-layer valve core is provided with an outer-layer convex column for controlling the on-off of the left two through holes, an outer-layer valve cavity is formed between the left end of the outer-layer valve core and the left end of the outer-layer plug hole in the outer-layer plug hole, and an outer-layer oil hole for communicating the outer-layer valve cavity with the right two through holes is formed in the outer-layer valve core; the outer layer spring is positioned between the right end of the outer layer valve core and the outer layer plug and is used for forcing the outer layer valve core to move leftwards; the outer side of the outer-layer valve core is provided with an outer-layer convex shoulder which is connected in an outer-layer seat hole in a sliding manner, a left-second chamber is formed between the outer-layer convex shoulder and the left end of the outer-layer seat hole in the outer-layer seat hole, and a right-second chamber is formed between the outer-layer convex shoulder and the left end of the outer-layer plug; the first left chamber is communicated with the right chamber, and the first right chamber is communicated with the second left chamber.
Furthermore, a first through hole used for communicating the first left cavity and the second right cavity and a second through hole used for communicating the first right cavity and the second left cavity are formed in the left valve body.
Furthermore, a first liquid supplementing one-way valve and a second liquid supplementing one-way valve are arranged in the left valve body, an oil inlet of the first liquid supplementing one-way valve is communicated with the inner layer slotted hole, an oil outlet of the first liquid supplementing one-way valve is communicated with the right cavity, an oil inlet of the second liquid supplementing one-way valve is communicated with the outer layer slotted hole, and an oil outlet of the second liquid supplementing one-way valve is communicated with the right cavity.
Furthermore, the left side of the right valve body is provided with an inner layer notch right facing the inner layer seat hole, an outer layer notch right facing the outer layer seat hole, the inner layer notch is communicated with the right through hole, and the outer layer notch is communicated with the right through hole.
Advantageous effects
Compared with the prior art, the technical scheme of the invention has the following advantages:
(1) the invention is provided with the inner-layer valve control assembly and the outer-layer valve control assembly, when an unexpected situation occurs, the inner-layer valve control assembly and the outer-layer valve control assembly are simultaneously closed, so that the on-off of the inner-layer coiled tubing and the outer-layer coiled tubing can be effectively sealed, well fluid is prevented from returning out, and well blowout is prevented;
(2) the invention has simple and compact structure, low opening pressure of the inner layer valve control assembly and the outer layer valve control assembly, and has the advantages of high pressure bearing capacity and safe and reliable construction operation;
(3) the inner-layer valve control assembly and the outer-layer valve control assembly are communicated through the liquid flow path, so that the inner-layer valve control assembly and the outer-layer valve control assembly are opened and closed simultaneously, mechanical connection is not needed, and compared with the prior art, the valve control assembly has the advantages of simple structure and longer service life.
Drawings
FIG. 1 is a cross-sectional view of the present invention with the inner and outer valve control assemblies in a closed position;
FIG. 2 is a cross-sectional view of the present invention, shown in the operational state of the inner coiled tubing being injected into the outer coiled tubing and being returned out of the outer coiled tubing;
FIG. 3 is a cross-sectional view of the present invention, shown in an operational state with the outer coiled tubing injected into the inner coiled tubing and returned out;
FIG. 4 is a cross-sectional view of the left and right valve bodies of the present invention.
Detailed Description
Referring to fig. 1-4, the downhole check valve is arranged between double-layer coiled tubing, the right end of the downhole check valve is communicated with the bottom of a well, the downhole check valve comprises a left valve body 1, the left end of the left valve body 1 is provided with a left threaded hole 11 connected with the outer-layer coiled tubing and a left two threaded hole 12 connected with the inner-layer coiled tubing, and a left two through hole 14 communicated with the left threaded hole 11 and a left one through hole 13 communicated with the left two threaded hole 12 are arranged in the left valve body 1; a right valve body 2 is fixedly installed at the right end of the left valve body 1, a right threaded hole 21 connected with an outer-layer coiled tubing and a right two-threaded hole 22 connected with an inner-layer coiled tubing are formed in the right end of the right valve body 2, and a right two-way hole 24 communicated with the right threaded hole 21 and a right one-through hole 23 communicated with the right two-threaded hole 22 are formed in the right valve body 2; the left valve body 1 is internally provided with an inner-layer valve control assembly and an outer-layer valve control assembly which are mutually related, when pressure difference exists between the left through hole 13 and the right through hole 23 and the pressure in any one of an outer continuous oil pipe and an inner continuous oil pipe at the left end of the check valve is not less than bottom hole pressure, the inner-layer valve control assembly and the outer-layer valve control assembly are both opened, the left through hole 13 is communicated with the right through hole 23, the left through hole 14 is communicated with the right through hole 24, when the bottom hole pressure is greater than the pressure in the outer continuous oil pipe and the inner continuous oil pipe at the left end of the check valve, the inner-layer valve control assembly and the outer-layer valve control assembly are both closed, the left through hole 13 is disconnected with the right through hole 23, and the left through.
The inner valve control assembly comprises an inner valve core 41 and an inner spring 42, an inner seat hole 1a with an opening at the right end is formed in the left valve body 1, and the right end of the inner seat hole 1a is communicated with the right through hole 23; an inner layer plug hole 1b is formed in the left valve body 1 at the center of the left end of the inner layer seat hole 1a along the axial direction of the inner layer seat hole 1a, and the left end of the inner layer plug hole 1b is communicated with a left through hole 13; a hollow inner layer plug 43 is fixedly arranged at the right end opening of the inner layer seat hole 1a, an inner layer groove hole 43a is formed in the left end of the inner layer plug 43, the left end of the inner layer valve core 41 is connected in the inner layer plug hole 1b in a sliding mode, and the right end of the inner layer valve core is connected in the inner layer groove hole 43a in a sliding mode; the left end of the inner layer valve core 41 is provided with an inner layer convex column 41a for controlling the on-off of the left through hole 13, an inner layer valve cavity 41b is formed between the left end of the inner layer valve core 41 and the left end of the inner layer plug hole 1b in the inner layer plug hole 1b, and an inner layer oil hole 41c for communicating the inner layer valve cavity 41b with the right through hole 23 is formed in the inner layer valve core 41; the inner spring 42 is positioned between the right end of the inner valve core 41 and the inner plug 43 and is used for forcing the inner valve core 41 to move leftwards; the outer side of the inner valve core 41 is provided with an inner shoulder 41d which is connected in a sliding manner in the inner seat hole 1a, a left chamber 4a is formed between the inner shoulder 41d and the left end of the inner seat hole 1a in the inner seat hole 1a, and a right chamber 4b is formed between the inner shoulder 41d and the left end of the inner plug 43.
The outer-layer valve control assembly comprises an outer-layer valve core 31 and an outer-layer spring 32, an outer-layer seat hole 1c with an opening at the right end is formed in the left valve body 1, and the right end of the outer-layer seat hole 1c is communicated with the right through hole 24; an outer layer plug hole 1d is formed in the left valve body 1 at the center of the left end of the outer layer socket hole 1c along the axial direction of the outer layer socket hole 1c, and the left end of the outer layer plug hole 1d is communicated with the left second through hole 14; a hollow outer layer plug 33 is fixedly arranged at the opening at the right end of the outer layer seat hole 1c, an outer layer slotted hole 33a is formed at the left end of the outer layer plug 33, the left end of the outer layer valve core 31 is connected in the outer layer plug hole 1d in a sliding mode, and the right end of the outer layer valve core 31 is connected in the outer layer slotted hole 33a in a sliding mode; the left end of the outer-layer valve core 31 is provided with an outer-layer convex column 31a for controlling the on-off of the left two through holes 14, an outer-layer valve cavity 31b is formed between the left end of the outer-layer valve core 31 and the left end of the outer-layer plug hole 1d in the outer-layer plug hole 1d, and an outer-layer oil hole 31c for communicating the outer-layer valve cavity 31b with the right two through hole 24 is arranged in the outer-layer valve core 31; the outer spring 32 is positioned between the right end of the outer valve core 31 and the outer plug 33 and used for forcing the outer valve core 31 to move leftwards; the outer side of the outer layer valve core 31 is arranged on an outer layer shoulder 31d which is connected in the outer layer seat hole 1c in a sliding mode, a left two-cavity chamber 3a is formed between the outer layer shoulder 31d and the left end of the outer layer seat hole 1c in the outer layer seat hole 1c, and a right two-cavity chamber 3b is formed between the outer layer shoulder 31d and the left end of the outer layer plug 33.
A first through hole 101 for communicating the first left chamber 4a with the right chamber 3b and a second through hole 102 for communicating the first right chamber 4b with the second left chamber 3a are formed in the left valve body 1. A first liquid supplementing one-way valve 5 and a second liquid supplementing one-way valve 6 are arranged in the left valve body 1, an oil inlet of the first liquid supplementing one-way valve 5 is communicated with the inner layer slotted hole 43a, an oil outlet of the first liquid supplementing one-way valve 5 is communicated with the right first cavity 4b, an oil inlet of the second liquid supplementing one-way valve 6 is communicated with the outer layer slotted hole 33a, and an oil outlet of the second liquid supplementing one-way valve 6 is communicated with the right second cavity 3 b; set up first fluid infusion check valve and can prevent that first cavity in the right side 4b and second cavity in the left side 3a from appearing the vacuum, set up the second fluid infusion check valve and can prevent that first cavity in the left side 4a and right cavity in the right side 3b from appearing true hole.
The inner notch 2a is arranged on the left side of the right valve body 2 opposite to the inner seat hole 1a, the outer notch 2b is arranged opposite to the outer seat hole 1c, the inner notch 2a is communicated with the right through hole 23, and the outer notch 2b is communicated with the right through hole 24.
As shown in fig. 2, it is a schematic view of the circulation working state of the inner coiled tubing injected into the outer coiled tubing and returned out of the outer coiled tubing. During operation, when flushing fluid is injected into the well bottom through the inner coiled tubing, the fluid in the inner coiled tubing enters the left through hole 13 through the left two threaded holes 12, the inner boss 41a moves rightwards under the action of hydraulic pressure to open the right end of the left through hole 13, when the inner spool 41 moves rightwards, the right chamber 4b is reduced, the left chamber 4a is enlarged, the fluid in the right chamber 4b enters the left two chambers 3a through the second through hole 102 and acts on the outer shoulder 31d, the outer spool 31 is pushed by the outer shoulder 31d to move rightwards, and therefore the right end of the left two through holes 14 is opened; in addition, the liquid in the right chamber 3b is replenished into the left chamber 4a through the first through hole 101. At the moment, the inner-layer valve control assembly and the outer-layer valve control assembly are both opened, flushing fluid can flow into the well through the left through hole 13, the inner-layer valve cavity 41b, the inner-layer oil hole 41c, the inner-layer slotted hole 43a, the inner-layer notch and the right through hole 23, and finally liquid returned from the bottom of the well flows out through the right through hole 24, the outer-layer notch, the outer-layer slotted hole 33a, the outer-layer oil hole 31c, the outer-layer valve cavity 31b and the left two through holes 14, so that the injection of the inner-layer coiled tubing is realized, the return of the outer-layer coiled tubing.
As shown in fig. 3, it is a schematic view of the circulation working state of the present invention that the outer coiled tubing is injected into the inner coiled tubing and returns out. During operation, when flushing fluid is injected into the well bottom through the outer-layer coiled tubing, the fluid in the outer-layer coiled tubing enters the left second through hole 14 through the left threaded hole 11, the outer-layer convex column 31a moves rightwards to open the right end of the left second through hole 14 under the action of hydraulic pressure, when the outer-layer valve core 31 moves rightwards, the right two cavities 3b are reduced, the left second cavities 3a are increased, the fluid in the right second cavities 3b enters the left first cavities 4a through the first through holes 101 and acts on the inner-layer shoulder 41d, the inner-layer valve core 41 is pushed by the inner-layer shoulder 41d to move rightwards, and therefore the right end of the left first through hole 13 is opened; in addition, the liquid in the right chamber 4b is replenished into the left chamber 3a through the second through hole 102. At the moment, the inner-layer valve control assembly and the outer-layer valve control assembly are both opened, flushing fluid can flow into the well through the left-second through hole 14, the outer-layer valve cavity 31b, the inner-layer oil hole 41c, the outer-layer slotted hole 33a, the outer-layer notch and the right through hole 24, and finally liquid returned from the bottom of the well flows out through the right-first through hole 23, the inner-layer notch, the inner-layer slotted hole 43a, the inner-layer oil hole 41c, the inner-layer valve cavity 41b and the left-first through hole 13, so that the injection of the inner-layer coiled tubing is realized, the return.
When the double-layer continuous oil pipe at the left end of the check valve is broken due to an emergency, and the bottom hole pressure is higher than the pressures in the outer-layer continuous oil pipe and the inner-layer continuous oil pipe at the left end of the check valve, the inner-layer conical valve core is under the bottom hole pressure and the acting force of the inner-layer spring 42 to drive the inner-layer convex column 41a to close the left through hole 13, and meanwhile, the outer-layer conical valve core is under the bottom hole pressure and the acting force of the outer-layer spring 32 to drive the outer-layer convex column 31a to close the left through hole 14, at the moment, as shown in fig. 1, the inner-layer valve control assembly and the outer-layer valve control assembly are closed, so that the check valve can simultaneously and effectively seal the inner-layer continuous oil pipe channel and the outer-layer continuous oil pipe channel.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the technical principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.
Claims (5)
1. A downhole check valve is arranged between double-layer coiled tubing, the right end of the downhole check valve is communicated with the bottom of a well, the downhole check valve is characterized by comprising a left valve body, the left end of the left valve body is provided with a left threaded hole connected with outer-layer coiled tubing and a left threaded hole connected with inner-layer coiled tubing, and a left through hole communicated with the left threaded hole are formed in the left valve body; the right valve body is fixedly installed at the right end of the left valve body, a right threaded hole connected with the outer-layer coiled tubing and a right two threaded holes connected with the inner-layer coiled tubing are formed in the right end of the right valve body, and a right two through hole communicated with the right threaded hole and a right one through hole communicated with the right two threaded holes are formed in the right valve body; the left valve body is internally provided with an inner-layer valve control assembly and an outer-layer valve control assembly which are mutually related, when pressure difference exists between the left through hole and the right through hole and the pressure in any one of the outer continuous oil pipe and the inner continuous oil pipe at the left end of the check valve is not less than bottom hole pressure, the inner-layer valve control assembly and the outer-layer valve control assembly are both opened, the left through hole is communicated with the right through hole, when the bottom hole pressure is greater than the pressures in the outer continuous oil pipe and the inner continuous oil pipe at the left end of the check valve, the inner-layer valve control assembly and the outer-layer valve control assembly are both closed, the left.
2. The downhole check valve as recited in claim 1, wherein the inner valve control assembly comprises an inner valve spool and an inner spring, wherein the left valve body has an inner seat bore with an open right end, and the right end of the inner seat bore communicates with the right through hole; an inner-layer plug hole is formed in the left valve body at the center of the left end of the inner-layer seat hole along the axial direction of the inner-layer seat hole, and the left end of the inner-layer plug hole is communicated with the left through hole; a hollow inner layer plug is fixedly arranged at the right end opening of the inner layer seat hole, an inner layer slotted hole is formed in the left end of the inner layer plug, the left end of the inner layer valve core is slidably connected into the inner layer plug hole, and the right end of the inner layer valve core is slidably connected into the inner layer slotted hole; the left end of the inner-layer valve core is provided with an inner-layer convex column for controlling the on-off of a left through hole, an inner-layer valve cavity is formed between the left end of the inner-layer valve core and the left end of the inner-layer plug hole in the inner-layer plug hole, and an inner-layer oil hole for communicating the inner-layer valve cavity with a right through hole is formed in the inner-layer valve core; the inner spring is positioned between the right end of the inner valve core and the inner plug and used for forcing the inner valve core to move leftwards; the outer side of the inner-layer valve core is provided with an inner-layer convex shoulder which is connected in an inner-layer seat hole in a sliding manner, a left cavity is formed between the inner-layer convex shoulder and the left end of the inner-layer seat hole in the inner-layer seat hole, and a right cavity is formed between the inner-layer convex shoulder and the left end of the inner-layer plug;
the outer-layer valve control assembly comprises an outer-layer valve core and an outer-layer spring, an outer-layer seat hole with an opening at the right end is formed in the left valve body, and the right end of the outer-layer seat hole is communicated with the right through hole; an outer layer plug hole is formed in the left valve body at the center of the left end of the outer layer seat hole along the axial direction of the outer layer seat hole, and the left end of the outer layer plug hole is communicated with the left two through holes; a hollow outer layer plug is fixedly arranged at the right end opening of the outer layer seat hole, an outer layer slotted hole is formed in the left end of the outer layer plug, the left end of the outer layer valve core is connected in the outer layer plug hole in a sliding mode, and the right end of the outer layer valve core is connected in the outer layer slotted hole in a sliding mode; the left end of the outer-layer valve core is provided with an outer-layer convex column for controlling the on-off of the left two through holes, an outer-layer valve cavity is formed between the left end of the outer-layer valve core and the left end of the outer-layer plug hole in the outer-layer plug hole, and an outer-layer oil hole for communicating the outer-layer valve cavity with the right two through holes is formed in the outer-layer valve core; the outer layer spring is positioned between the right end of the outer layer valve core and the outer layer plug and is used for forcing the outer layer valve core to move leftwards; the outer side of the outer-layer valve core is provided with an outer-layer convex shoulder which is connected in an outer-layer seat hole in a sliding manner, a left-second chamber is formed between the outer-layer convex shoulder and the left end of the outer-layer seat hole in the outer-layer seat hole, and a right-second chamber is formed between the outer-layer convex shoulder and the left end of the outer-layer plug; the first left chamber is communicated with the right chamber, and the first right chamber is communicated with the second left chamber.
3. The downhole check valve as recited in claim 2, wherein a first through hole is formed in the left valve body for communicating the first left chamber with the second right chamber, and a second through hole is formed in the left valve body for communicating the first right chamber with the second left chamber.
4. The downhole check valve as recited in claim 2, wherein a first fluid infusion check valve and a second fluid infusion check valve are arranged in the left valve body, an oil inlet of the first fluid infusion check valve is communicated with the inner layer slotted hole, an oil outlet of the first fluid infusion check valve is communicated with the right chamber, an oil inlet of the second fluid infusion check valve is communicated with the outer layer slotted hole, and an oil outlet of the second fluid infusion check valve is communicated with the right chamber.
5. The downhole check valve as recited in claim 2, wherein the right valve body left side has an inner notch facing the inner seat bore and an outer notch facing the outer seat bore, the inner notch communicating with the right through hole, the outer notch communicating with the right through hole.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010717126.6A CN111894517A (en) | 2020-07-23 | 2020-07-23 | Underground check valve |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010717126.6A CN111894517A (en) | 2020-07-23 | 2020-07-23 | Underground check valve |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN111894517A true CN111894517A (en) | 2020-11-06 |
Family
ID=73189767
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010717126.6A Withdrawn CN111894517A (en) | 2020-07-23 | 2020-07-23 | Underground check valve |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN111894517A (en) |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2001020213A1 (en) * | 1999-09-10 | 2001-03-22 | Bj Services Company, Usa. | Partial coil-in-coil tubing |
| US20040195007A1 (en) * | 2003-04-02 | 2004-10-07 | Halliburton Energy Services, Inc. | Method and apparatus for increasing drilling capacity and removing cuttings when drilling with coiled tubing |
| US20050150661A1 (en) * | 2004-01-09 | 2005-07-14 | Kenison Michael H. | Inflate control system for inflatable straddle stimulation tool |
| 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 |
| CN207436998U (en) * | 2017-11-29 | 2018-06-01 | 成都北方石油勘探开发技术有限公司 | For the water detection instrument of High water cut stop-spraying horizontal well |
-
2020
- 2020-07-23 CN CN202010717126.6A patent/CN111894517A/en not_active Withdrawn
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2001020213A1 (en) * | 1999-09-10 | 2001-03-22 | Bj Services Company, Usa. | Partial coil-in-coil tubing |
| US20040195007A1 (en) * | 2003-04-02 | 2004-10-07 | Halliburton Energy Services, Inc. | Method and apparatus for increasing drilling capacity and removing cuttings when drilling with coiled tubing |
| US20050150661A1 (en) * | 2004-01-09 | 2005-07-14 | Kenison Michael H. | Inflate control system for inflatable straddle stimulation tool |
| 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 |
| CN207436998U (en) * | 2017-11-29 | 2018-06-01 | 成都北方石油勘探开发技术有限公司 | For the water detection instrument of High water cut stop-spraying horizontal well |
Non-Patent Citations (1)
| Title |
|---|
| 杨炳华: "新型潜油电泵井单流阀的设计与应用", 《石油机械》 * |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US6237693B1 (en) | Failsafe safety valve and method | |
| US5022427A (en) | Annular safety system for gas lift production | |
| CA2670135C (en) | Control line hydrostatic minimally sensitive control system | |
| US20050178557A1 (en) | Electric-hydraulic power unit | |
| US10125877B2 (en) | Shuttle valve stabilization through pressure differential and shuttle valve with hollow poppet with weep hole | |
| US7806179B2 (en) | String mounted hydraulic pressure generating device for downhole tool actuation | |
| US20220170343A1 (en) | Valve arrangement | |
| EP2630326A2 (en) | Fluid injection device | |
| US5947206A (en) | Deep-set annulus vent valve | |
| US6810955B2 (en) | Gas lift mandrel | |
| US4431051A (en) | Surface controlled subsurface safety valve | |
| CN113882820B (en) | Blowout prevention valve in drilling tool | |
| CN111894517A (en) | Underground check valve | |
| WO1997047852A1 (en) | Downhole lubricator valve | |
| CN111878033B (en) | Underground double-channel check valve | |
| CN109798085A (en) | A kind of normally closed type unidirectionally injects downhole blow-out preventer | |
| CN111827928A (en) | Check valve for underground double-layer coiled tubing | |
| US20220170342A1 (en) | Valve arrangement | |
| CN113622844B (en) | Releasing tool | |
| CN111852967A (en) | Hydraulic control one-way valve for coal mine hydraulic support | |
| CN111878034B (en) | Uniflow valve for downhole tool | |
| CN111894515A (en) | Check valve for downhole tool | |
| CN214170497U (en) | Underground hydraulic control switch for high-pressure oil-water well | |
| US12031403B2 (en) | Automatic choking hydraulic shock reduction valve | |
| CN201057020Y (en) | Pressure-controlled shunting system |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| WW01 | Invention patent application withdrawn after publication |
Application publication date: 20201106 |
|
| WW01 | Invention patent application withdrawn after publication |