CN107165604B - Liquid-proof fluctuation drainage device and its application method - Google Patents
Liquid-proof fluctuation drainage device and its application method Download PDFInfo
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- CN107165604B CN107165604B CN201710566458.7A CN201710566458A CN107165604B CN 107165604 B CN107165604 B CN 107165604B CN 201710566458 A CN201710566458 A CN 201710566458A CN 107165604 B CN107165604 B CN 107165604B
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- 238000000034 method Methods 0.000 title claims abstract description 12
- 239000012530 fluid Substances 0.000 claims abstract description 43
- 230000007246 mechanism Effects 0.000 claims abstract description 22
- 238000007789 sealing Methods 0.000 claims abstract description 6
- 238000004519 manufacturing process Methods 0.000 claims description 13
- 239000011148 porous material Substances 0.000 claims description 12
- 239000007788 liquid Substances 0.000 claims description 10
- 230000010355 oscillation Effects 0.000 claims description 9
- 238000011084 recovery Methods 0.000 claims description 8
- 239000003129 oil well Substances 0.000 claims description 6
- 230000006835 compression Effects 0.000 claims description 3
- 238000007906 compression Methods 0.000 claims description 3
- 239000003921 oil Substances 0.000 description 33
- 230000008901 benefit Effects 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 238000007689 inspection Methods 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 230000002159 abnormal effect Effects 0.000 description 1
- 210000001772 blood platelet Anatomy 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 239000010779 crude oil Substances 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000004519 grease Substances 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 239000010865 sewage Substances 0.000 description 1
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
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- 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)
- Safety Valves (AREA)
Abstract
The invention provides a kind of liquid-proof fluctuation drainage device and its application method, wherein liquid-proof fluctuation drainage device, including top connection and central tube, top connection and central tube are threadedly coupled, and fluid cylinder is cased with outside central tube；Fluid cylinder one end is fixedly connected by shear pin with top connection, and the other end is slidably connected with the sealing of center pipe outer wall；Annular volume chamber is formed between central tube and fluid cylinder, the annular volume is intracavitary to be equipped with limiting mechanism of pressure；Central tube side wall is equipped with several radial oil leak holes, and several radial oil leak holes are respectively positioned between top connection and limiting mechanism of pressure.Liquid-proof fluctuation drainage device described in the invention can adapt to the fluctuation of underground fluid column without failure, high stability.
Description
Technical field
The invention belongs to oil production equipment field, more particularly, to a kind of liquid-proof fluctuation drainage device and its user
Method.
Background technique
During Production Wells, underground work is the means of most conventional maintenance oil well.In rod-pumped well inspection pump etc.
When playing pipe operation, in order not to make crude oil, sewage in oil pipe etc. take ground pollution environment to, construction speed is influenced, and cause wave
Take, bleeder is usually mounted on pump or more in advance in lower flow string, to make in oil pipe during inspection pumps up pipe
Grease is let out in oil jacket annulus.
Currently, plate let out let out with sliding sleeve as the common drainage device in oil field have the advantages that it is easy to use but complete in oil well
During pump testing after well, since pressure controls unstable, abnormal high pressure in tubing string is easily caused, leads to that plate is let out or sliding sleeve lets out opening；
In addition, some underground work (such as perforation) will also result in fluid column larger fluctuation in tubing string, this fluid power fluctuation may directly be led
It causes the copper sheet that baffle is let out, sliding sleeve is let out to cut, causes operation to do over again, seriously affect the normal production of oil well.
Summary of the invention
In view of this, the invention is directed to a kind of liquid-proof fluctuation drainage device, to overcome lacking for the prior art
It falls into, can adapt to the fluctuation of underground fluid column without failure, high stability.
In order to achieve the above objectives, the technical solution of the invention is achieved in that
Liquid-proof fluctuation drainage device, including top connection and central tube, top connection and central tube are threadedly coupled, outside central tube
It is cased with fluid cylinder；Fluid cylinder one end is fixedly connected by shear pin with top connection, and the other end is slidably connected with the sealing of center pipe outer wall；Center
Annular volume chamber is formed between pipe and fluid cylinder, the annular volume is intracavitary to be equipped with limiting mechanism of pressure；Central tube side wall is equipped with several
A radial direction oil leak hole, and several radial oil leak holes are respectively positioned between top connection and limiting mechanism of pressure.
Further, outer circle is equipped with a boss in the middle part of the central tube, which is located at central tube and fluid cylinder forms ring
Within shape cavity volume.
Further, the limiting mechanism of pressure is mounted on the periphery of central tube, and part is limited by boss.
Further, the limiting mechanism of pressure includes pressure limiting valve body, and an end face of pressure limiting valve body is contacted with the end face of boss；
Pressure limiting valve body threaded one end is connected with valve seat, and the other end is threaded with spring pressure cap；The valve seat is close to radial oil leak hole, bullet
Spring pressure cap is close to boss；Spool is equipped between the valve seat and spring pressure cap, the periphery of spool is equipped with spring.
Further, the valve seat is equipped with inner conical surface close to spool side, and the male cone (strobilus masculinus) of the inner conical surface and spool matches splice grafting
Touching.
Further, pore is equipped in the valve seat；The pore one end extends to valve seat close to radial oil leak hole one end
End face, and be connected to annular volume chamber, the other end of pore extends at inner conical surface.
Further, it is sealed between side by the first O-ring in the outside of the central tube and pressure limiting valve body；Pressure limiting valve body
It is sealed between on the inside of outside and fluid cylinder by the 4th O-ring.
Further, the top connection and fluid cylinder are sealed by the second O-ring；Pass through between the outside and fluid cylinder of central tube
The sealing of third O-ring；The quantity of the radial direction oil leak hole is 3-6.
Second purpose of the invention proposes a kind of method using liquid-proof fluctuation drainage device as described above,
To improve the stability of oil recovery using the oil recovery of above-mentioned liquid-proof fluctuation drainage device and draining.
A method of using liquid-proof fluctuation drainage device as described above, comprising the following steps:
S1: the liquid-proof fluctuation drainage device is gone into the well before use, by adjustment spring pressure cap to the compression degree of spring,
Set the threshold value P of limiting mechanism of pressure；
S2: being mounted on oil well pump top and G.I.H for liquid-proof fluctuation drainage device, production of recovering the oil；
S3: in normal oil recovery production process, if pressure oscillation peak value is less than P in tubing string, pressure will not be made in tubing string
Fluid cylinder is used, liquid-proof fluctuation drainage device will not be opened；
S4: in normal oil recovery production process, if pressure oscillation peak value is greater than P in tubing string, liquid passes through limit in tubing string
Press mechanism enters annular volume chamber, and defining the time that liquid fills up annular volume chamber in tubing string is T, pressure oscillation in tubing string
Time is t, and as t < T, pressure will not be applied to fluid cylinder in same tubing string, and liquid-proof fluctuation drainage device will not be opened；
S5: when needing upper lifting pipe post draining, P1 is suppressed into tubing string, and as P1 > P+p, oil jacket annulus connection reaches and lets out
The purpose of oil；Wherein p is pressure needed for cutting shear pin.
Further, the value range of P is in 15-30MPa, and the value range of p is in 5-15MPa；The value range of T is 1-
3s；The value range of t is 0-1000ms；Preferably, the value range of P is 10MPa in 20-25MPa, the value of p；The value of T
For 2s；The value range of t is 600ms.
Compared with the existing technology, liquid-proof fluctuation drainage device described in the invention has the advantage that
Liquid-proof fluctuation drainage device described in the invention can largely overcome existing for existing drainage device
Vulnerable problem can effectively improve the stability of drainage device, reduce unnecessary operating cost, meet oilfield safety environmental protection
Production requirement, for oil field cost efficiency provide technology guarantee.
A kind of method using liquid-proof fluctuation drainage device as described above and above-mentioned liquid-proof fluctuation draining fill
Set compared with the existing technology possessed by advantage it is identical, details are not described herein.
Detailed description of the invention
The attached drawing for constituting a part of the invention is used to provide to further understand the invention, present invention wound
The illustrative embodiments and their description made are used to explain the present invention creation, do not constitute the improper restriction to the invention.?
In attached drawing:
Fig. 1 is liquid-proof fluctuation drainage device structural schematic diagram described in the invention embodiment；
Fig. 2 is the structural schematic diagram of limiting mechanism of pressure in liquid-proof fluctuation drainage device described in the invention embodiment.
Description of symbols:
1- top connection；2- central tube；3- shear pin；The second O-ring of 4-；5- fluid cylinder；6- valve seat；The 4th O-ring of 7-；8- pressure limiting
Valve body；9- spring；The first O-ring of 10-；11- spool；12- spring pressure cap；13- third O-ring；14- boss；15- male cone (strobilus masculinus)；
16- inner conical surface；17- radial direction oil leak hole；18- pore；19- annular volume chamber.
Specific embodiment
It should be noted that in the absence of conflict, the feature in embodiment and embodiment in the invention can
To be combined with each other.
In the description of the invention, it is to be understood that term " center ", " longitudinal direction ", " transverse direction ", "upper", "lower",
The orientation or positional relationship of the instructions such as "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outside" is
It is based on the orientation or positional relationship shown in the drawings, is merely for convenience of description the invention and simplifies description, rather than indicate
Or imply that signified device or element must have a particular orientation, be constructed and operated in a specific orientation, therefore cannot understand
For the limitation to the invention.In addition, term " first ", " second " etc. are used for description purposes only, and should not be understood as indicating
Or it implies relative importance or implicitly indicates the quantity of indicated technical characteristic." first ", " second " etc. are defined as a result,
Feature can explicitly or implicitly include one or more of the features.In the description of the invention, unless separately
It is described, the meaning of " plurality " is two or more.
In the description of the invention, it should be noted that unless otherwise clearly defined and limited, term " peace
Dress ", " connected ", " connection " shall be understood in a broad sense, for example, it may be being fixedly connected, may be a detachable connection, or integrally
Connection；It can be mechanical connection, be also possible to be electrically connected；Can be directly connected, can also indirectly connected through an intermediary,
It can be the connection inside two elements.For the ordinary skill in the art, on being understood by concrete condition
State concrete meaning of the term in the invention.
The present invention will be described in detail below with reference to the accompanying drawings and embodiments creates.
As illustrated in fig. 1 and 2, liquid-proof fluctuation drainage device, including top connection 1 and central tube 2, top connection 1 and central tube 2
It is threadedly coupled, fluid cylinder 5 is cased with outside central tube 2；5 one end of fluid cylinder is fixedly connected by shear pin 3 with top connection 1, the other end and center
The sealing of 2 outer wall of pipe is slidably connected；Annular volume chamber 19 is formed between central tube 2 and fluid cylinder 5, is equipped in the annular volume chamber 19
Limiting mechanism of pressure；2 side wall of central tube is equipped with several radial oil leak holes 17, and several radial oil leak holes 17 are respectively positioned on top connection
Between 1 and limiting mechanism of pressure.
Above-mentioned 2 middle part outer circle of central tube is equipped with a boss 14, which is located at central tube 2 and fluid cylinder 5 forms annular
Within cavity volume 19.
Above-mentioned limiting mechanism of pressure is mounted on the periphery of central tube 2, and part is limited by boss 14.
Above-mentioned limiting mechanism of pressure includes pressure limiting valve body 8, and an end face of pressure limiting valve body 8 is contacted with the end face of boss 14；Pressure limiting
8 threaded one end of valve body is connected with valve seat 6, and the other end is threaded with spring pressure cap 12；The valve seat 6 is close to radial oil leak hole
17, spring pressure cap 12 is close to boss 14；Spool 11, the periphery installation of spool 11 are equipped between the valve seat 6 and spring pressure cap 12
There is spring 9.
Above-mentioned valve seat 6 is equipped with inner conical surface 16, the cooperation of male cone (strobilus masculinus) 15 of the inner conical surface 16 and spool 11 close to 11 side of spool
Contact.
Pore 18 is equipped in above-mentioned valve seat 6；18 one end of pore extends to valve seat 6 close to the end of 17 one end of radial oil leak hole
Face, and be connected to annular volume chamber 19, the other end of pore 18 extends at inner conical surface 16.
It is sealed between 8 inside of outside and pressure limiting valve body of above-mentioned central tube 2 by the first O-ring 10；8 outside of pressure limiting valve body
It is sealed between 5 inside of fluid cylinder by the 4th O-ring 7.
Above-mentioned top connection 1 is sealed with fluid cylinder 5 by the second O-ring 4；Pass through third between the outside and fluid cylinder 5 of central tube 2
O-ring 13 seals；The quantity of the radial direction oil leak hole 17 is 4.
The working principle of the present embodiment liquid-proof fluctuation drainage device are as follows:
In use, liquid-proof fluctuation drainage device underground work normally when, due to being sealed between fluid cylinder 5 and top connection 1,
Oily liquid in pipe can not enter annular volume chamber 19, and liquid-proof fluctuation drainage device by the radial oil leak hole 17 of central tube 2
The hydraulic fluctuation in tubing string, anti-locking apparatus accident oil jacket connection, specifically, being exactly the threshold that limiting mechanism of pressure has setting can be buffered
Value, when surge pressure is less than threshold value in tubing string, pressure, which will not be transmitted in fluid cylinder 5, keeps fluid cylinder 5 mobile, presses when fluctuating in tubing string
When power is greater than threshold value, overcomes 9 resistance of spring to push spool 11 mobile by the pore 18 of valve seat 6, liquid in tubing string is made to enter liquid
The annular volume chamber 19 of cylinder 5 and 2 lower end of central tube composition, filling up the time required for annular volume chamber 19 is delay time, is prolonged
The slow time can be greater than the time of pressure oscillation in tubing string, therefore will not make fluid cylinder 5 is mobile to cut during pressure oscillation in tubing string
Shear pin 3 achievees the purpose that prevent fluid power fluctuation from drainage device being caused surprisingly to open；
When needing upper lifting pipe post draining, suppressed into tubing string, pressure through central tube 2 radial oil leak hole 17 conduction to by
In the annular volume chamber 19 that central tube 2, top connection 1, fluid cylinder 5 form, when pressure is greater than the threshold value of limiting mechanism of pressure, by valve seat 6
Pore 18 overcome 9 resistance of spring to push spool 11 mobile, so that liquid in tubing string is entered fluid cylinder 5 and 2 lower end of central tube composition
Annular volume chamber 19 fills up after annular volume chamber 19 and further pushes fluid cylinder 5 is mobile to cut shear pin 3, is connected to oil jacket annulus, reaches
To the purpose of draining.
The application method of above-mentioned liquid-proof fluctuation drainage device, comprising the following steps:
S1: the liquid-proof fluctuation drainage device is gone into the well before use, by adjustment spring pressure cap 12 to the compression journey of spring 9
Degree, sets the threshold value P of limiting mechanism of pressure；
S2: being mounted on oil well pump top and G.I.H for liquid-proof fluctuation drainage device, production of recovering the oil；
S3: in normal oil recovery production process, if pressure oscillation peak value is less than P in tubing string, pressure will not be made in tubing string
Fluid cylinder 5 is used, liquid-proof fluctuation drainage device will not be opened；
S4: in normal oil recovery production process, if pressure oscillation peak value is greater than P in tubing string, liquid passes through limit in tubing string
Press mechanism enters annular volume chamber 19, and defining the time that liquid fills up annular volume chamber 19 in tubing string is T, pressure wave in tubing string
The dynamic time is t, and as t < T, pressure will not be applied to fluid cylinder 5 in same tubing string, and liquid-proof fluctuation drainage device will not be opened；
S5: when needing upper lifting pipe post draining, P1 is suppressed into tubing string, and as P1 > P+p, oil jacket annulus connection reaches and lets out
The purpose of oil；Wherein p is pressure needed for cutting shear pin.
In above-mentioned steps, P is in 23MPa, p 10MPa；T is 2s；T is 600ms.
The foregoing is merely the preferred embodiments of the invention, are not intended to limit the invention creation, all at this
Within the spirit and principle of innovation and creation, any modification, equivalent replacement, improvement and so on should be included in the invention
Protection scope within.
Claims (11)
1. liquid-proof fluctuation drainage device, including top connection (1) and central tube (2), it is characterised in that: top connection (1) and center
It manages (2) to be threadedly coupled, is cased with fluid cylinder (5) outside central tube (2)；Fluid cylinder (5) one end connects by the way that shear pin (3) and top connection (1) are fixed
It connects, the other end is slidably connected with the sealing of central tube (2) outer wall；Annular volume chamber is formed between central tube (2) and fluid cylinder (5)
(19), limiting mechanism of pressure is installed in the annular volume chamber (19)；Central tube (2) side wall is equipped with several radial oil leak holes
(17), and several radial oil leak holes (17) are respectively positioned between top connection (1) and limiting mechanism of pressure；The limiting mechanism of pressure includes pressure limiting
Valve body (8)；Pressure limiting valve body (8) threaded one end is connected with valve seat (6), and the other end is threaded with spring pressure cap (12)；The valve
Seat (6) is close to radial oil leak hole (17)；Spool (11) are equipped between the valve seat (6) and spring pressure cap (12), spool (11)
Periphery is equipped with spring (9).
2. liquid-proof fluctuation drainage device according to claim 1, it is characterised in that: outer circle in the middle part of the central tube (2)
It is equipped with a boss (14), which is located at central tube (2) and fluid cylinder (5) is formed within annular volume chamber (19).
3. liquid-proof fluctuation drainage device according to claim 2, it is characterised in that: the limiting mechanism of pressure is mounted on center
The periphery of (2) is managed, and part is limited by boss (14).
4. liquid-proof fluctuation drainage device according to claim 2, it is characterised in that: an end face of pressure limiting valve body (8)
It is contacted with the end face of boss (14)；Spring pressure cap (12) is close to boss (14).
5. liquid-proof fluctuation drainage device according to claim 4, it is characterised in that: the valve seat (6) is close to spool
(11) side is equipped with inner conical surface (16), which contacts with the cooperation of the male cone (strobilus masculinus) (15) of spool (11).
6. liquid-proof fluctuation drainage device according to claim 5, it is characterised in that: be equipped with pore in the valve seat (6)
(18)；Pore (18) one end extends to valve seat (6) close to the end face of radial oil leak hole (17) one end, and with annular volume chamber
(19) it is connected to, the other end of pore (18) extends at inner conical surface (16).
7. liquid-proof fluctuation drainage device according to claim 4, it is characterised in that: the outside of the central tube (2) with
It is sealed between on the inside of pressure limiting valve body (8) by the first O-ring (10)；Pass through between on the outside of pressure limiting valve body (8) and on the inside of fluid cylinder (5)
The sealing of 4th O-ring (7).
8. liquid-proof fluctuation drainage device according to claim 1, it is characterised in that: the top connection (1) and fluid cylinder (5)
It is sealed by the second O-ring (4)；It is sealed between the outside and fluid cylinder (5) of central tube (2) by third O-ring (13)；The diameter
It is 3-6 to the quantity of oil leak hole (17).
9. a kind of method using the liquid-proof fluctuation drainage device as described in claim 1 to 8 any one, feature exist
In: the following steps are included:
S1: the liquid-proof fluctuation drainage device is gone into the well before use, by adjustment spring pressure cap (12) to the compression journey of spring (9)
Degree, sets the threshold value P of limiting mechanism of pressure；
S2: being mounted on oil well pump top and G.I.H for liquid-proof fluctuation drainage device, production of recovering the oil；
S3: in normal oil recovery production process, if pressure oscillation peak value is less than P in tubing string, pressure will not be applied in tubing string
Fluid cylinder (5), liquid-proof fluctuation drainage device will not be opened；
S4: in normal oil recovery production process, if pressure oscillation peak value is greater than P in tubing string, liquid passes through pressure limiting machine in tubing string
Structure enters annular volume chamber (19), and defining the time that liquid fills up annular volume chamber (19) in tubing string is T, pressure wave in tubing string
The dynamic time is t, and as t < T, pressure will not be applied to fluid cylinder (5) in same tubing string, and liquid-proof fluctuation drainage device will not be opened
It opens；
S5: when needing upper lifting pipe post draining, P1 is suppressed into tubing string, and as P1 > P+p, oil jacket annulus connection reaches draining
Purpose；Wherein p is pressure needed for cutting shear pin.
10. the application method of liquid-proof fluctuation drainage device according to claim 9, it is characterised in that: the value range of P
In 15-30MPa, the value range of p is in 5-15MPa；The value range of T is 1-3s；The value range of t is 0-1000ms.
11. the application method of liquid-proof fluctuation drainage device according to claim 9, it is characterised in that: the value range of P
In 20-25MPa, the value of p is 10MPa；The value of T is 2s；The value range of t is 600ms.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710566458.7A CN107165604B (en) | 2017-07-12 | 2017-07-12 | Liquid-proof fluctuation drainage device and its application method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710566458.7A CN107165604B (en) | 2017-07-12 | 2017-07-12 | Liquid-proof fluctuation drainage device and its application method |
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| CN107165604A CN107165604A (en) | 2017-09-15 |
| CN107165604B true CN107165604B (en) | 2019-07-12 |
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| CN201710566458.7A Active CN107165604B (en) | 2017-07-12 | 2017-07-12 | Liquid-proof fluctuation drainage device and its application method |
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Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108868693B (en) * | 2018-09-14 | 2024-05-07 | 天津大港油田石油工程研究院钻采技术开发有限公司 | Air compression oil drain device |
| CN108915636B (en) * | 2018-09-14 | 2023-12-15 | 天津大港油田石油工程研究院钻采技术开发有限公司 | Liquid impact resistant oil drain device |
| CN110984910A (en) * | 2019-11-27 | 2020-04-10 | 淮安市井神钻采机具有限公司 | Energy-saving environment-friendly integral spraying anti-corrosion oil drain device |
| CN113202458B (en) * | 2021-06-18 | 2024-07-09 | 西安大泽电子科技有限责任公司 | Tail pipe type underground electronic pressure gauge with oil drainage function |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4286662A (en) * | 1979-11-05 | 1981-09-01 | Page John S Jr | Tubing drain |
| CN201391276Y (en) * | 2009-04-01 | 2010-01-27 | 马中原 | Rotary type oil drainage device |
| CN102797436A (en) * | 2012-07-27 | 2012-11-28 | 中国石油化工股份有限公司 | Rotary type tubing drain and use method thereof |
| CN103410470A (en) * | 2013-08-22 | 2013-11-27 | 中国海洋石油总公司 | Thermal injection pipe column and thermal injection valve of heavy oil thermal recovery well |
| CN105971558A (en) * | 2016-05-10 | 2016-09-28 | 辽宁新华仪器有限公司 | Oil drain device |
| WO2016191721A2 (en) * | 2015-05-27 | 2016-12-01 | Flow Control Llc. | Fluid release valve |
-
2017
- 2017-07-12 CN CN201710566458.7A patent/CN107165604B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4286662A (en) * | 1979-11-05 | 1981-09-01 | Page John S Jr | Tubing drain |
| CN201391276Y (en) * | 2009-04-01 | 2010-01-27 | 马中原 | Rotary type oil drainage device |
| CN102797436A (en) * | 2012-07-27 | 2012-11-28 | 中国石油化工股份有限公司 | Rotary type tubing drain and use method thereof |
| CN103410470A (en) * | 2013-08-22 | 2013-11-27 | 中国海洋石油总公司 | Thermal injection pipe column and thermal injection valve of heavy oil thermal recovery well |
| WO2016191721A2 (en) * | 2015-05-27 | 2016-12-01 | Flow Control Llc. | Fluid release valve |
| CN105971558A (en) * | 2016-05-10 | 2016-09-28 | 辽宁新华仪器有限公司 | Oil drain device |
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|---|---|
| CN107165604A (en) | 2017-09-15 |
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