CN111965085A - Back pressure device for rock core detection - Google Patents
Back pressure device for rock core detection Download PDFInfo
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- CN111965085A CN111965085A CN202010621853.2A CN202010621853A CN111965085A CN 111965085 A CN111965085 A CN 111965085A CN 202010621853 A CN202010621853 A CN 202010621853A CN 111965085 A CN111965085 A CN 111965085A
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- pressure valve
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- 238000001514 detection method Methods 0.000 title claims abstract description 28
- 239000011435 rock Substances 0.000 title claims abstract description 17
- 239000007788 liquid Substances 0.000 claims abstract description 15
- 238000003825 pressing Methods 0.000 claims description 10
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 8
- 239000010439 graphite Substances 0.000 claims description 8
- 229910002804 graphite Inorganic materials 0.000 claims description 8
- 238000007789 sealing Methods 0.000 claims description 7
- 230000006835 compression Effects 0.000 claims description 6
- 238000007906 compression Methods 0.000 claims description 6
- 229920001343 polytetrafluoroethylene Polymers 0.000 claims description 6
- 239000004810 polytetrafluoroethylene Substances 0.000 claims description 6
- 239000010720 hydraulic oil Substances 0.000 claims description 3
- 238000000034 method Methods 0.000 claims description 3
- 239000012466 permeate Substances 0.000 claims description 2
- 238000012856 packing Methods 0.000 claims 1
- 230000000694 effects Effects 0.000 description 3
- 229910052500 inorganic mineral Inorganic materials 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 239000011707 mineral Substances 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 239000004809 Teflon Substances 0.000 description 1
- 229920006362 Teflon® Polymers 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 230000008595 infiltration Effects 0.000 description 1
- 238000001764 infiltration Methods 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000003921 oil Substances 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume, or surface-area of porous materials
- G01N15/08—Investigating permeability, pore-volume, or surface area of porous materials
- G01N15/082—Investigating permeability by forcing a fluid through a sample
- G01N15/0826—Investigating permeability by forcing a fluid through a sample and measuring fluid flow rate, i.e. permeation rate or pressure change
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- Chemical & Material Sciences (AREA)
- Physics & Mathematics (AREA)
- Analytical Chemistry (AREA)
- Dispersion Chemistry (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Fluid Mechanics (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Indication Of The Valve Opening Or Closing Status (AREA)
Abstract
The invention discloses a back pressure device for detecting a rock core, which comprises a back pressure device, a back pressure mechanism and a piston type back pressure valve, wherein the back pressure device is provided with the piston type back pressure valve and the back pressure mechanism which are connected by a guide pipe, the piston type back pressure valve is provided with a valve body, a plug and a lower plug, a piston is arranged in the valve body and is driven by hydraulic change in the back pressure mechanism to download the interior of the valve body to move, the plug is arranged in a cylinder body of the back pressure mechanism and is arranged in one end of a rubber sleeve, the piston type back pressure valve is connected outside the back pressure mechanism and controls the pressure in the rubber sleeve, when the pressure in the rubber sleeve is larger than the pressure value set by the piston type back pressure valve, the plug moves leftwards, liquid in the rubber sleeve returns to the interior of the piston type back pressure valve through the back pressure pipe, so that the pressure in the rubber sleeve is stabilized, the piston moves to the right, and the detection liquid is pushed into the rubber sleeve, so that the internal pressure of the rubber sleeve is stabilized.
Description
Technical Field
The invention relates to the technical field of back pressure devices for core detection, in particular to a back pressure device for core detection.
Background
The core sample is a substantially cylindrical test piece of subterranean material taken from the ground for testing by a special drill.
The core is a cylindrical rock sample taken from a hole by using a core ring bit and other coring tools according to the needs of geological work or engineering, and ore-containing rock or ore taken from an ore body or an ore bed of solid mineral products is called the core. The core is an important material for researching and understanding underground geology and mineral production.
During exploration and development of oil and gas fields, according to stratum positions and design depths obtained through exploration, a coring tool is put into a well, and a rock sample taken out is drilled. The core is the most intuitive and practical data for understanding the characteristics of the underground reservoir and the contained fluid. There are two modes of side-wall coring and well-bore coring, the latter being the primary mode of coring in general.
At present, when core detection is carried out, mechanical pressure application or manual pressure adjustment pressure application is generally adopted, so that the pressure environment inside the core detection equipment is not stable enough.
Disclosure of Invention
The invention aims to provide a back pressure device for rock core detection, which can be used for automatically controlling the pressure balance in a rubber sleeve by a back pressure mode so as to solve the problems in the background technology.
In order to achieve the purpose, the invention provides the following technical scheme: a back pressure device for rock core detection comprises a back pressure device, a back pressure mechanism and a piston type back pressure valve, wherein the back pressure device is provided with the piston type back pressure valve and the back pressure mechanism, a flow guide pipe is arranged between the piston type back pressure valve and the back pressure mechanism, the piston type back pressure valve is provided with a valve body, a piston is arranged inside the valve body, two sealing rings are arranged outside the piston, a convex block is arranged in the center of the left side of the piston, one end of the valve body is provided with an upper plug, the other end of the valve body is provided with a lower plug, the upper plug and the lower plug are fixedly connected with the valve body through screws, the back pressure mechanism is provided with a barrel, a rubber sleeve is arranged inside the barrel, a plug is arranged inside one end of the rubber sleeve, an axial pressure cap, an axial pressure plug and a pressure cap are arranged outside one end of the plug, the axial pressure cap, the axial pressure plug and the pressure cap are, a graphite tetrafluoro gasket A is arranged between the outer wall of the taper sleeve and the inner wall of the cylinder body.
Preferably, two O-shaped sealing rings are arranged on the outer part of the piston.
Preferably, the inside central authorities horizontal direction of going up the end cap is equipped with back pressure valve joint mounting groove, and the inside of back pressure valve joint mounting groove is equipped with back pressure valve and connects, the inside central authorities that back pressure valve connects are equipped with honeycomb duct A, are equipped with sealed the pad on honeycomb duct A's the one end, be equipped with the nut between back pressure valve joint and the last end cap, the top that back pressure valve connects is equipped with the pipeline.
Preferably, a flow guide pipe B is arranged in the center of the lower plug in the horizontal direction.
Preferably, the outside of barrel is equipped with the gear, and one side of gear is equipped with the gear fixed disk, adopt screw fixed connection between gear and the gear fixed disk, gear fixed disk and the outside fixed connection of barrel.
Preferably, a movable adjusting groove is formed between the taper sleeve and the plug, a back-pressure pipe is arranged inside the taper sleeve, one end of the back-pressure pipe is communicated with the movable adjusting groove, an O ring C is arranged between the taper sleeve and the plug, and a graphite PTFE washer B is arranged between the taper sleeve and the outside of the axial compression plug.
Preferably, an O ring A and a PTFE ring are arranged between the axial compression cap and the axial compression plug.
Preferably, the working method of the back pressure device for core detection comprises the following steps:
A. connecting the piston type back pressure valve with the back pressure mechanism by adopting a flow guide pipe, and setting the pressure control range of the piston type back pressure valve;
B. to the inside rock core injection detection liquid of gum cover, detect liquid infiltration rock core, the inside detection of gum cover also pressurizes gradually, gum cover internal pressure risees gradually, the end cap is along with the riseing gradually of pressure, the end cap moves to the left, make the tapering cover, removal adjustment tank and back pressure pipe intercommunication between the end cap, inside detection liquid of gum cover enters into inside the piston back pressure valve, pass the piston left, when piston back pressure valve internal pressure reaches the pressure that the piston back pressure valve set for, the piston stops to move, when the inside pressure of gum cover reduces, back pressure valve joint on the piston back pressure valve lets in hydraulic oil, push the piston right side, make gum cover internal pressure reach the pressure range that the piston back pressure valve set for.
Compared with the prior art, the invention has the beneficial effects that:
(1) a movable adjusting groove is arranged between the taper sleeve and the plug, an O-ring C is arranged between the taper sleeve and the plug, when the internal pressure of the rubber sleeve is overlarge, the plug moves leftwards to open a gap between the rubber sleeve and the back pressure pipe, when the internal pressure of the rubber sleeve is smaller than a set pressure value, the plug moves rightwards to close a channel between the rubber sleeve and the back pressure pipe, and the O-ring C between the taper sleeve and the plug enables the adjusting groove to be conveniently used for adjusting the plug in a matched mode, and has the effect of sealing and opening;
(2) when the internal pressure of the rubber sleeve is greater than the pressure value set by the piston type back pressure valve, the plug moves to the left, liquid in the rubber sleeve returns to the interior of the piston type back pressure valve through the back pressure pipe, so that the internal pressure of the rubber sleeve is stabilized, when the internal pressure of the rubber sleeve is less than the pressure value set by the piston type back pressure valve, the piston moves to the right, and detection liquid is pushed into the rubber sleeve, so that the internal pressure of the rubber sleeve is stabilized.
Drawings
FIG. 1 is a schematic structural view of a back pressure device according to the present invention;
FIG. 2 is a sectional view of the back pressure device of the present invention;
fig. 3 is a cross-sectional view of the piston-type back pressure valve of the present invention.
In the figure: 1. a back pressure device; 2. a piston type back pressure valve; 3. pressing the cap by the shaft; 4. axially pressing the plug; 5. pressing the cap; 6. a taper sleeve; 7. pressing a cap A; 8. a bearing chamber end cap; 9. a graphite tetrafluoro washer B; 10. a plug; 11. o ring A; 12. a teflon ring; 13. an O ring B; 14. a gear; 15. a gear fixing disc; 16. a graphite tetrafluoro washer A; 17. an O ring C; 18. a back pressure valve joint; 19. a flow guide pipe A; 20. a nut; 21. an upper plug; 22. a valve body; 23. a piston; 24. a lower plug; 25. a flow guide pipe B; 26. a gasket; 27. a back pressure mechanism; 28. a barrel; 29. a back pressure pipe; 30. and (4) a rubber sleeve.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1-3, the present invention provides a technical solution: the utility model provides a rock core detects uses back pressure device, including back pressure device 1, back pressure mechanism 27, piston back pressure valve 2, be equipped with piston back pressure valve 2 and back pressure mechanism 27 on the back pressure device 1, be equipped with the honeycomb duct between piston back pressure valve 2 and the back pressure mechanism 27, be equipped with valve body 22 on the piston back pressure valve 2, the inside of valve body 22 is equipped with piston 23, the outside of piston 23 is equipped with two sealing washers, the left side central authorities of piston 23 are equipped with the lug, the outside of piston 23 is equipped with two O type sealing washers.
One end of valve body 22 is equipped with end cap 21, the inside central horizontal direction of going up end cap 21 is equipped with back pressure valve joint mounting groove, the inside of back pressure valve joint mounting groove is equipped with back pressure valve joint 18, the inside central authorities of back pressure valve joint 18 are equipped with honeycomb duct A19, be equipped with sealed pad 26 on the one end of honeycomb duct A19, when piston 23 moved left, the lug of piston 23 one side will seal up the pad 26 and open, make the honeycomb duct switch-on between piston back pressure valve 2 and the back pressure mechanism 27, be equipped with the nut between back pressure valve joint 18 and the last end cap 21, the top that back pressure valve joint 18 was equipped with the guide pipe way.
The other end of the valve body 22 is provided with a lower plug 24, a flow guide pipe B25 is arranged in the center of the lower plug 24 in the horizontal direction, the upper plug 21 is arranged, the lower plugs 24 are fixedly connected with the valve body 22 through screws, the back pressure mechanism 27 is provided with a cylinder 28, a gear 14 is arranged outside the cylinder 28, one side of the gear 14 is provided with a gear fixing disc 15, the gear 14 is fixedly connected with the gear fixing disc 15 through screws, the gear fixing disc 15 is fixedly connected with the outside of the cylinder 28, a rubber sleeve 30 is arranged inside the cylinder 28, a plug 10 is arranged inside one end of the rubber sleeve 30, a shaft pressure cap 3 is arranged outside one end of the plug 10, an O ring A11 and a PTFE ring 12 are arranged between the shaft pressure cap 3 and the shaft pressure plug 10, the shaft pressure plug 4 and a pressure cap 5 are arranged, the shaft pressure cap 3, the shaft pressure plug 4 is arranged.
The taper sleeve 6 is arranged outside the plug 10, the movable adjusting groove is formed between the taper sleeve 6 and the plug 10, the back pressure pipe 29 is arranged inside the taper sleeve 6, one end of the back pressure pipe 29 is communicated with the movable adjusting groove, the O ring C17 is arranged between the taper sleeve 6 and the plug 10, the graphite PTFE gasket B9 is arranged between the taper sleeve 6 and the outside of the axial compression plug 4, and the graphite PTFE gasket A16 is arranged between the outer wall of the taper sleeve 6 and the inner wall of the barrel 28.
Be equipped with O circle C17 between tapering cover and the end cap, when gum cover 30 internal pressure was too big, end cap 10 moves left and opens between gum cover 30 and the back pressure pipe 29, be less than the set pressure value when gum cover 30 internal pressure, end cap 10 moves right, close the passageway between gum cover 30 and the back pressure pipe 29, O circle C17 between tapering cover 6 and the end cap 10, make the adjustment tank conveniently be used for the regulation of cooperation end cap, O circle C has the sealed effect of opening and close, thereby block between management and control back pressure mechanism 27 and the piston back pressure valve 2 and the switch-on effect.
The working method of the back pressure device for detecting the core comprises the following steps: the piston type back pressure valve 2 is connected with the back pressure mechanism 27 by a flow guide pipe, the pressure control range of the piston type back pressure valve 2 is set, the detection liquid is injected into the rock core inside the rubber sleeve 30, the detection liquid permeates the rock core, the detection inside the rubber sleeve is gradually pressurized, the pressure inside the rubber sleeve 30 is gradually increased, the plug 10 is gradually increased along with the gradual increase of the pressure, the plug 10 moves to the left, so that the taper sleeve 6 and the movement adjusting groove between the plugs 10 are communicated with the back pressure pipe 29, the detection liquid inside the rubber sleeve 30 enters the piston type back pressure valve 2, and the piston 23 is pushed to the left, when the internal pressure of the piston-type back-pressure valve 2 reaches the pressure set by the piston-type back-pressure valve 2, the piston 23 stops moving, when the internal pressure of the rubber sleeve 30 is reduced, hydraulic oil is introduced into the back-pressure valve joint 18 on the piston type back-pressure valve 2 to push the piston 23 to the right, so that the internal pressure of the rubber sleeve 30 reaches the pressure range set by the piston type back-pressure valve 2.
In the invention, when the internal pressure of the rubber sleeve 30 is greater than the pressure value set by the piston type back pressure valve 2, the plug 10 moves leftwards, the liquid in the rubber sleeve 30 returns to the interior of the piston type back pressure valve 2 through the back pressure pipe 29, so that the internal pressure of the rubber sleeve 30 is stabilized, and when the internal pressure of the rubber sleeve 30 is less than the pressure value set by the piston type back pressure valve 2, the piston 23 moves rightwards, so that the detection liquid is pushed into the rubber sleeve 30, so that the internal pressure of the rubber sleeve 30 is stabilized.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (8)
1. The utility model provides a rock core detects uses back pressure device, includes back pressure device (1), back pressure mechanism (27), piston back pressure valve (2), its characterized in that: the back pressure device (1) is provided with a piston type back pressure valve (2) and a back pressure mechanism (27), a guide pipe is arranged between the piston type back pressure valve (2) and the back pressure mechanism (27), a valve body (22) is arranged on the piston type back pressure valve (2), a piston (23) is arranged inside the valve body (22), two sealing rings are arranged outside the piston (23), a convex block is arranged in the center of the left side of the piston (23), an upper plug (21) is arranged at one end of the valve body (22), a lower plug (24) is arranged at the other end of the valve body (22), the upper plug (21) and the lower plug (24) are fixedly connected with the valve body (22) through screws, a barrel (28) is arranged on the back pressure mechanism (27), a rubber sleeve (30) is arranged inside the barrel (28), a plug (10) is arranged inside one end of the rubber sleeve (30), and a shaft pressure cap (3) is arranged outside one end of, the shaft pressing plug comprises a shaft pressing plug body (4) and a pressing cap (5), wherein the shaft pressing plug body (3), the shaft pressing plug body (4) and the pressing cap (5) are installed in a matched mode from inside to outside, a taper sleeve (6) is arranged outside the plug body (10), and a graphite tetrafluoro gasket A (16) is arranged between the outer wall of the taper sleeve (6) and the inner wall of a barrel body (28).
2. The back pressure device for core detection according to claim 1, wherein: two O-shaped sealing rings are arranged outside the piston (23).
3. The back pressure device for core detection according to claim 1, wherein: go up the inside central authorities horizontal direction of end cap (21) and be equipped with back pressure valve joint mounting groove, the inside of back pressure valve joint mounting groove is equipped with back pressure valve joint (18), the inside central authorities that back pressure valve joint (18) were equipped with honeycomb duct A (19), are equipped with sealed pad (26) on the one end of honeycomb duct A (19), be equipped with the nut between back pressure valve joint (18) and last end cap (21), the top that back pressure valve joint (18) is equipped with the guide pipe way.
4. The back pressure device for core detection according to claim 1, wherein: and a flow guide pipe B (25) is arranged in the center of the lower plug (24) in the horizontal direction.
5. The back pressure device for core detection according to claim 1, wherein: the outside of barrel (28) is equipped with gear (14), and one side of gear (14) is equipped with gear fixed disk (15), adopt screw fixed connection between gear (14) and gear fixed disk (15), gear fixed disk (15) and barrel (28) outside fixed connection.
6. The back pressure device for core detection according to claim 1, wherein: be equipped with the removal adjustment tank between tapering cover (6) and end cap (10), the inside of tapering cover (6) is equipped with back pressure pipe (29), and the one end and the removal adjustment tank intercommunication of back pressure pipe (29), be equipped with O circle C (17) between tapering cover (6) and end cap (10), be equipped with graphite tetrafluoro packing ring B (9) between tapering cover (6) and the axle load end cap (4) outside.
7. The back pressure device for core detection according to claim 1, wherein: an O ring A (11) and a PTFE ring (12) are arranged between the axial compression cap (3) and the axial compression plug (10).
8. The back pressure device for detecting the rock core, which realizes the power claim 1, comprises the following working methods:
A. the piston type back pressure valve (2) is connected with the back pressure mechanism (27) by a guide pipe, and the pressure control range of the piston type back pressure valve (2) is set;
B. injecting detection liquid into the rock core in the rubber sleeve (30), enabling the detection liquid to permeate the rock core, gradually increasing the pressure in the rubber sleeve (30), enabling the plug (10) to move leftwards along with the gradual increase of the pressure, enabling the taper sleeve (6) and the movement adjusting groove between the plugs (10) to be communicated with the back pressure pipe (29), enabling the detection liquid in the rubber sleeve (30) to enter the piston type back pressure valve (2) to push the piston (23) leftwards, when the internal pressure of the piston type back pressure valve (2) reaches the pressure set by the piston type back pressure valve (2), the piston (23) stops moving, when the internal pressure of the rubber sleeve (30) is reduced, hydraulic oil is introduced into a back-pressure valve joint (18) on the piston type back-pressure valve (2) to push the piston (23) to the right, so that the internal pressure of the rubber sleeve (30) reaches the pressure range set by the piston type back-pressure valve (2).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010621853.2A CN111965085A (en) | 2020-06-30 | 2020-06-30 | Back pressure device for rock core detection |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010621853.2A CN111965085A (en) | 2020-06-30 | 2020-06-30 | Back pressure device for rock core detection |
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| Publication Number | Publication Date |
|---|---|
| CN111965085A true CN111965085A (en) | 2020-11-20 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010621853.2A Pending CN111965085A (en) | 2020-06-30 | 2020-06-30 | Back pressure device for rock core detection |
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| CN (1) | CN111965085A (en) |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202502089U (en) * | 2011-12-05 | 2012-10-24 | 中国石油大学(华东) | Device for diagenesis simulation experiments |
| CN203594845U (en) * | 2013-10-12 | 2014-05-14 | 南通市中京机械有限公司 | Back-pressure valve |
| CN106525889A (en) * | 2016-11-03 | 2017-03-22 | 中国科学院力学研究所 | Experiment device and method for simulating hole diameter variations in tight oil depletion development process |
| CN110057686A (en) * | 2019-05-15 | 2019-07-26 | 江苏拓创科研仪器有限公司 | Cover pressure three axle clamp holder of analyzer |
| CN110260006A (en) * | 2019-05-24 | 2019-09-20 | 南通市中京机械有限公司 | A kind of back-pressure valve |
| CN110346449A (en) * | 2019-05-24 | 2019-10-18 | 南通市中京机械有限公司 | Sound wave clamper |
| CN110685738A (en) * | 2019-11-20 | 2020-01-14 | 徐州中矿大贝克福尔科技股份有限公司 | Pressure relief device for monitoring pressure of paste filling pipeline and control method |
-
2020
- 2020-06-30 CN CN202010621853.2A patent/CN111965085A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202502089U (en) * | 2011-12-05 | 2012-10-24 | 中国石油大学(华东) | Device for diagenesis simulation experiments |
| CN203594845U (en) * | 2013-10-12 | 2014-05-14 | 南通市中京机械有限公司 | Back-pressure valve |
| CN106525889A (en) * | 2016-11-03 | 2017-03-22 | 中国科学院力学研究所 | Experiment device and method for simulating hole diameter variations in tight oil depletion development process |
| CN110057686A (en) * | 2019-05-15 | 2019-07-26 | 江苏拓创科研仪器有限公司 | Cover pressure three axle clamp holder of analyzer |
| CN110260006A (en) * | 2019-05-24 | 2019-09-20 | 南通市中京机械有限公司 | A kind of back-pressure valve |
| CN110346449A (en) * | 2019-05-24 | 2019-10-18 | 南通市中京机械有限公司 | Sound wave clamper |
| CN110685738A (en) * | 2019-11-20 | 2020-01-14 | 徐州中矿大贝克福尔科技股份有限公司 | Pressure relief device for monitoring pressure of paste filling pipeline and control method |
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Application publication date: 20201120 |
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