CN112343591A - Anti-freezing sampler - Google Patents
Anti-freezing sampler Download PDFInfo
- Publication number
- CN112343591A CN112343591A CN202011020975.2A CN202011020975A CN112343591A CN 112343591 A CN112343591 A CN 112343591A CN 202011020975 A CN202011020975 A CN 202011020975A CN 112343591 A CN112343591 A CN 112343591A
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- Prior art keywords
- pipe
- oil
- cavity
- fixedly connected
- threaded
- 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.)
- Pending
Links
- 238000007710 freezing Methods 0.000 title claims abstract description 7
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 17
- 238000005070 sampling Methods 0.000 claims abstract description 13
- 238000003825 pressing Methods 0.000 claims abstract description 12
- 239000002131 composite material Substances 0.000 claims abstract description 8
- 238000000605 extraction Methods 0.000 claims abstract description 6
- 238000012360 testing method Methods 0.000 claims abstract description 5
- 230000006835 compression Effects 0.000 claims description 9
- 238000007906 compression Methods 0.000 claims description 9
- 235000017166 Bambusa arundinacea Nutrition 0.000 claims description 8
- 235000017491 Bambusa tulda Nutrition 0.000 claims description 8
- 241001330002 Bambuseae Species 0.000 claims description 8
- 235000015334 Phyllostachys viridis Nutrition 0.000 claims description 8
- 239000011425 bamboo Substances 0.000 claims description 8
- 230000002528 anti-freeze Effects 0.000 claims description 7
- 230000007246 mechanism Effects 0.000 claims description 7
- 238000007789 sealing Methods 0.000 claims description 4
- 230000008094 contradictory effect Effects 0.000 claims 1
- 239000012530 fluid Substances 0.000 abstract description 5
- 238000001514 detection method Methods 0.000 abstract description 4
- 239000003208 petroleum Substances 0.000 abstract description 4
- 150000001875 compounds Chemical class 0.000 description 7
- 239000007788 liquid Substances 0.000 description 6
- 208000001034 Frostbite Diseases 0.000 description 3
- 238000010438 heat treatment Methods 0.000 description 3
- 238000004321 preservation Methods 0.000 description 3
- 238000011084 recovery Methods 0.000 description 3
- 230000009471 action Effects 0.000 description 2
- 230000008014 freezing Effects 0.000 description 2
- FGRBYDKOBBBPOI-UHFFFAOYSA-N 10,10-dioxo-2-[4-(N-phenylanilino)phenyl]thioxanthen-9-one Chemical compound O=C1c2ccccc2S(=O)(=O)c2ccc(cc12)-c1ccc(cc1)N(c1ccccc1)c1ccccc1 FGRBYDKOBBBPOI-UHFFFAOYSA-N 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 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
- 230000000694 effects Effects 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
- 238000000926 separation method Methods 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Images
Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B49/00—Testing the nature of borehole walls; Formation testing; Methods or apparatus for obtaining samples of soil or well fluids, specially adapted to earth drilling or wells
- E21B49/08—Obtaining fluid samples or testing fluids, in boreholes or wells
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B49/00—Testing the nature of borehole walls; Formation testing; Methods or apparatus for obtaining samples of soil or well fluids, specially adapted to earth drilling or wells
- E21B49/08—Obtaining fluid samples or testing fluids, in boreholes or wells
- E21B49/086—Withdrawing samples at the surface
Abstract
The invention relates to the technical field of petroleum sampling equipment, in particular to an anti-freezing sampler which comprises an oil conveying pipe and a sampling shell, wherein the sampling shell is sequentially provided with a flow guide cavity and a main flow cavity from left to right, the upper end of the main flow cavity is provided with a pressure testing device, an oil taking opening and closing assembly is arranged in the flow guide cavity, the oil taking opening and closing assembly comprises a first plug, a push rod, a composite pipe fitting, a rotary disc, a movable cylinder, a limiting disc, a pressing plate and a threaded rod, the composite pipe fitting is rotatably arranged in the sampling shell, one end of the rotary disc is fixedly connected with the movable cylinder, the other end of the rotary disc is fixedly connected with the composite pipe fitting, one end of the push rod is fixedly connected with the limiting disc, the other end of the push rod is. Through carrying out horizontal relative motion's left scraper blade and right scraper blade, can in time discharge residual fluid propelling movement to oil extraction pipe in the water conservancy diversion intracavity to ensure sample detection's the degree of accuracy.
Description
Technical Field
The invention relates to the technical field of petroleum sampling equipment, in particular to an anti-freezing sampler.
Background
Along with the development of society, the demand for various oil products such as petroleum is increasing, and the oil recovery process is becoming stricter and stricter simultaneously, and oil sampling, chemical examination and analysis are required to be regularly carried out on oil field oil recovery production wells.
Chinese utility model patent with application number CN201820873993.7 is an oil recovery well head sampler that prevents frostbite, including the sampler casing, the sampler casing includes shell, heat preservation, zone of heating and heat-conducting layer from outer to interior in proper order, the inner wall fixedly connected with heat preservation of shell, the inner wall fixedly connected with zone of heating of heat preservation, the inner wall fixedly connected with heat-conducting layer of zone of heating. The device generates heat through the power supply of the storage battery, and the heat is transferred to the flow guide cavity through the heat conduction layer, so that the petroleum in the flow guide cavity is prevented from freezing. However, this device has the following problems in practical use;
partial oil liquid is easy to remain in a liquid inlet pipe and a liquid outlet of the device, so that freezing is caused, the sampling is difficult, and the sampling working efficiency is influenced; and redundant fluid in the liquid inlet pipe can not be replaced in time or discharged incompletely, so that the accuracy of an analysis result is influenced.
In view of this, we propose an antifreeze sampler.
Disclosure of Invention
The present invention is directed to an antifreeze sampler, which solves the above problems.
In order to achieve the purpose, the invention provides the following technical scheme: the utility model provides a sampler prevents frostbite, includes defeated oil pipe and sets up the sample casing on defeated oil pipe lateral wall, the sample casing has set gradually water conservancy diversion chamber and mainstream chamber from the left right side, the upper end in mainstream chamber is provided with pressure test device, the water conservancy diversion intracavity is provided with gets oil and opens and close the subassembly, it opens and close the subassembly including first end cap, push rod, compound pipe fitting, carousel, a movable section of thick bamboo, spacing dish, clamp plate and threaded rod to get oil, compound pipe fitting rotates and installs in the sample casing, carousel one end fixed connection movable section of thick bamboo, the compound pipe fitting of carousel other end fixed connection, the spacing dish of push rod one end fixed connection, the push rod other end stretches into in the mainstream chamber and the first end cap of fixed connection, and the bottom in water conservancy diversion chamber has set gradually from the left right side to the right.
Preferably, compound pipe fitting includes coaxial welded first screwed pipe and second screwed pipe, the screw thread opposite direction of first screwed pipe and second screwed pipe, threaded connection has left scraper blade on the first screwed pipe, threaded connection has right scraper blade on the second screwed pipe, left side scraper blade and right scraper blade are about arranging oil pipe mirror symmetry, the cylindrical cavity has been seted up on the right side of arranging oil pipe, cylindrical cavity movable mounting has the hemisphere slider, the hemisphere slider is contradicted in the bottom of right scraper blade.
Preferably, a movable cavity is formed in the bottom of the cylindrical cavity, a plugging mechanism is arranged in the movable cavity and comprises a second plug, a movable block, a compression spring and a pressure rod, one end of the movable block is fixedly connected with the compression spring, the other end of the movable block is fixedly connected with the second plug, the second plug penetrates through the side wall of the oil discharge pipe and plugs the inner cavity of the oil discharge pipe, a slope cavity is formed in the upper end face of the movable block, one end of the pressure rod is fixedly connected with the hemispherical sliding block, and the other end of the pressure rod is arc-shaped and extends into the slope cavity.
Preferably, the right side of spacing dish is provided with reset spring, reset spring cover is established on the push rod, threaded rod one end fixed connection knob, the threaded rod other end stretches into a movable section of thick bamboo and fixed connection clamp plate, the clamp plate is inconsistent with spacing dish, and the threaded rod is with the left side wall screw-thread fit of a movable section of thick bamboo.
Preferably, the aperture of the diversion cavity is smaller than that of the main flow cavity, the first plug is a cone mechanism, and a sealing ring is arranged at the position where the diversion cavity abuts against the first plug.
Preferably, the one end that left scraper blade and right scraper blade are close to the oil extraction pipe all sets up to the curved surface structure, and left scraper blade and right scraper blade and water conservancy diversion chamber sliding fit.
Compared with the prior art, the invention has the beneficial effects that:
1. when the oil discharge pipe is used, the right scraper plate acts on the hemispherical sliding block and presses the hemispherical sliding block downwards, so that the hemispherical sliding block drives the pressure rod to penetrate into the inclined surface cavity, the moving block overcomes the elastic action of the compression spring and drives the second plug to move towards the right side, and oil can normally pass through the oil discharge pipe.
2. The oil-liquid separation device is novel in structure, reasonable in design and simple in operation, the first threaded pipe and the second threaded pipe are driven to rotate through the rotary table, and the left scraper and the right scraper horizontally move in opposite directions due to the fact that the threaded directions of the first threaded pipe and the second threaded pipe are opposite, so that oil liquid remaining in the diversion cavity can be pushed to the oil discharge pipe to be discharged in time, and accuracy of sample detection is guaranteed.
Drawings
FIG. 1 is a front view of the structure of the present invention;
FIG. 2 is an enlarged view of area A of FIG. 1;
FIG. 3 is a schematic view of the left and right squeegees of the present invention.
In the figure: the oil delivery pipe comprises an oil delivery pipe 1, a sampling shell 2, a flow guide cavity 201, a main flow cavity 202, a first plug 3, a push rod 4, a first threaded pipe 5, a second threaded pipe 6, a left scraper 7, a right scraper 8, a rotary table 9, a movable cylinder 10, a limiting disc 11, a pressure plate 12, a threaded rod 13, an oil taking nozzle 14, an oil discharge pipe 15, a second plug 16, a movable block 17, a compression spring 18, a pressure rod 19, a hemispherical sliding block 20, a cylindrical cavity 21 and a return spring 22.
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 to 3, the present invention provides a technical solution: the utility model provides a sampler prevents frostbite, includes defeated oil pipe 1 and sets up sample casing 2 on defeated oil pipe 1 lateral wall, and sample casing 2 has set gradually water conservancy diversion chamber 201 and mainstream chamber 202 from the left right side, and the aperture in water conservancy diversion chamber 201 is less than the aperture size in mainstream chamber 202, and first end cap 3 is cone mechanism, and water conservancy diversion chamber 201 is provided with the sealing washer with 3 conflict departments of first end cap. The upper end of mainstream chamber 202 is provided with pressure test device, and pressure test device includes manometer and manometer takeover. Be provided with in the water conservancy diversion chamber 201 and get oil and open and close the subassembly, it includes first end cap 3 to get oil and open and close the subassembly, push rod 4, the compound pipe fitting in the push rod 4 outside is established to the cover, carousel 9, a movable section of thick bamboo 10, spacing dish 11, clamp plate 12 and threaded rod 13, compound pipe fitting rotates and installs in sample casing 2, a carousel 9 one end fixed connection movable section of thick bamboo 10, the compound pipe fitting of carousel 9 other end fixed connection, the spacing dish 11 of 4 one end fixed connection of push rod, the 4 other ends of push rod stretch into mainstream chamber 202 and the first end cap 3 of fixed connection, and the bottom of water conservancy diversion chamber 201 has set gradually from the left hand right side and has got. The oil taking nozzle 14 is screwed on the sampling shell 1 through internal and external threads, and the oil discharge pipe 15 is fixed on the sampling shell 1 in an adhesive manner.
As shown in fig. 1 and fig. 3, the composite pipe fitting includes a first threaded pipe 5 and a second threaded pipe 6 which are coaxially welded, the thread directions of the first threaded pipe 5 and the second threaded pipe 6 are opposite, a left scraper 7 is in threaded connection with the first threaded pipe 5, a right scraper 8 is in threaded connection with the second threaded pipe 6, the left scraper 7 and the right scraper 8 are in mirror symmetry with respect to an oil discharge pipe 15, a cylindrical cavity 21 is formed on the right side of the oil discharge pipe 15, a hemispherical slider 20 is movably mounted in the cylindrical cavity 21, and the hemispherical slider 20 abuts against the bottom of the right scraper 8. The one end that left scraper blade 7 and right scraper blade 8 are close to oil extraction pipe 15 all sets up to the curved surface structure, and left scraper blade 7 and right scraper blade 8 and water conservancy diversion chamber 201 sliding fit.
Drive first screwed pipe 5 and second screwed pipe 6 through carousel 9 and rotate, because the screw thread opposite direction of first screwed pipe 5 and second screwed pipe 6 for left scraper blade 7 and right scraper blade 8 carry out the horizontally relative motion, thereby can in time discharge remaining fluid propelling movement to oil extraction pipe 15 in the water conservancy diversion chamber 201, thereby ensure sample detection's the degree of accuracy.
As shown in fig. 2, a movable cavity is formed in the bottom of the cylindrical cavity 21, a plugging mechanism is arranged in the movable cavity, the plugging mechanism comprises a second plug 16, a moving block 17, a compression spring 18 and a pressing rod 19, one end of the moving block 17 is fixedly connected with the compression spring 18, the other end of the moving block 17 is fixedly connected with the second plug 16, the second plug 16 penetrates through the side wall of the oil discharge pipe 15 and plugs the inner cavity of the oil discharge pipe, a slope cavity is formed in the upper end face of the moving block 17, one end of the pressing rod 19 is fixedly connected with a hemispherical slider 20, and the other end of the pressing rod 19 is arc-shaped. During the use, right scraper blade 8 acts on hemisphere slider 20 and pushes it down for hemisphere slider 20 drives depression bar 19 and goes deep into the inclined plane chamber, thereby makes movable block 17 overcome compression spring 18's elastic action and drive second end cap 16 and move to the right side, thereby makes fluid normally pass through oil extraction pipe 15.
As shown in fig. 1, a return spring 22 is arranged on the right side of the limiting disc 11, the return spring 22 is sleeved on the push rod 4, one end of the threaded rod 13 is fixedly connected with the knob, the other end of the threaded rod 13 extends into the movable cylinder 10 and is fixedly connected with the pressing plate 12, the pressing plate 12 is abutted against the limiting disc 11, and the threaded rod 13 is in threaded fit with the left side wall of the movable cylinder 10. The pressing plate 12 is driven to move towards the right side by rotating the threaded rod 13 and acts on the limiting disc 11, so that the push rod 4 drives the first plug 3 to move towards the right side, and oil in the main flow cavity 202 can normally flow into the flow guide cavity 201.
The working principle is as follows: in practical use, firstly, the rotary table 9 is rotated clockwise, so that the rotary table 9 drives the first threaded pipe 5 and the second threaded pipe 6 to rotate, the left scraper 7 moves to the left position of the oil taking nozzle 14, the right scraper 8 moves to the right position of the cylindrical cavity 21, the oil taking nozzle 14 is in an open state at the moment, and the oil discharge pipe 15 is in a closed state; then, the threaded rod 13 is rotated clockwise to drive the pressing plate 12 to move towards the right side and act on the limiting disc 11, so that the push rod 4 drives the first plug 3 to move towards the right side, and therefore oil in the main flow cavity 202 can normally flow into the flow guide cavity 201 and flow into the oil taking nozzle 14 to be collected and sampled; after finishing using, at first through rotating threaded rod 13, make clamp plate 12 remove the effort to spacing dish 11, this moment under reset spring 22's bounce-back effect, push rod 4 drives first end cap 3 and moves to home position on a left side, make first end cap 3 carry out the shutoff to water conservancy diversion chamber 201, stop the oil feed, anticlockwise rotation carousel 9 is followed, make left scraper blade 7 and right scraper blade 8 carry out the opposite direction and move to oil drain pipe 15 entrance, because it is in the closed condition to get glib 14 this moment, oil drain pipe 15 is in the open mode, unnecessary fluid can in time discharge through oil drain pipe 15 in water conservancy diversion chamber 201 in proper order, thereby ensure the degree of accuracy of sample detection.
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 (6)
1. The utility model provides an anti-freezing sampler, includes defeated oil pipe (1) and sets up sample casing (2) on defeated oil pipe (1) lateral wall, its characterized in that: the sampling shell (2) is provided with a flow guide cavity (201) and a main flow cavity (202) from left to right in sequence, the upper end of the main flow cavity (202) is provided with a pressure testing device, the guide cavity (201) is internally provided with an oil taking opening and closing assembly, the oil taking opening and closing assembly comprises a first plug (3), a push rod (4), a composite pipe fitting, a rotary table (9), a movable cylinder (10), a limiting disc (11), a pressing plate (12) and a threaded rod (13), the composite pipe fitting is rotatably arranged in the sampling shell (2), one end of the rotary table (9) is fixedly connected with the movable cylinder (10), the other end of the rotary table (9) is fixedly connected with a composite pipe fitting, one end of the push rod (4) is fixedly connected with a limiting disc (11), the other end of the push rod (4) extends into the main flow cavity (202) and is fixedly connected with a first choke plug (3), and the bottom of the flow guide cavity (201) is sequentially provided with an oil taking nozzle (14) and an oil discharge pipe (15) from left to right.
2. An antifreeze sampler according to claim 1, wherein: the composite pipe fitting comprises a first threaded pipe (5) and a second threaded pipe (6) which are coaxially welded, the thread directions of the first threaded pipe (5) and the second threaded pipe (6) are opposite, a left scraper (7) is in threaded connection with the first threaded pipe (5), a right scraper (8) is in threaded connection with the second threaded pipe (6), the left scraper (7) and the right scraper (8) are in mirror symmetry with respect to an oil discharge pipe (15), a cylindrical cavity (21) is formed in the right side of the oil discharge pipe (15), a hemispherical slider (20) is movably mounted in the cylindrical cavity (21), and the hemispherical slider (20) abuts against the bottom of the right scraper (8).
3. An antifreeze sampler according to claim 2, wherein: the oil pipe sealing device is characterized in that a movable cavity is formed in the bottom of the cylindrical cavity (21), a plugging mechanism is arranged in the movable cavity and comprises a second plug (16), a moving block (17), a compression spring (18) and a pressing rod (19), one end of the moving block (17) is fixedly connected with the compression spring (18), the other end of the moving block (17) is fixedly connected with the second plug (16), the second plug (16) penetrates through the side wall of the oil pipe (15) and plugs the inner cavity of the oil pipe, a slope cavity is formed in the upper end face of the moving block (17), one end of the pressing rod (19) is fixedly connected with a hemispherical slider (20), and the other end of the pressing rod (19) is arc-shaped and extends into the slope.
4. An antifreeze sampler according to claim 1, wherein: the right side of spacing dish (11) is provided with reset spring (22), reset spring (22) cover is established on push rod (4), threaded rod (13) one end fixed connection knob, threaded rod (13) other end stretches into movable section of thick bamboo (10) and fixed connection clamp plate (12), clamp plate (12) and spacing dish (11) are inconsistent, and threaded rod (13) and the left side wall screw-thread fit of a movable section of thick bamboo (10).
5. An antifreeze sampler according to claim 1, wherein: the aperture of water conservancy diversion chamber (201) is less than the aperture size in mainstream chamber (202), first end cap (3) are cone mechanism, and water conservancy diversion chamber (201) and first end cap (3) department of contradicting are provided with the sealing washer.
6. An antifreeze sampler according to claim 2, wherein: the one end that left side scraper blade (7) and right scraper blade (8) are close to oil extraction pipe (15) all sets up to the curved surface structure, and left side scraper blade (7) and right scraper blade (8) and water conservancy diversion chamber (201) sliding fit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011020975.2A CN112343591A (en) | 2020-09-24 | 2020-09-24 | Anti-freezing sampler |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011020975.2A CN112343591A (en) | 2020-09-24 | 2020-09-24 | Anti-freezing sampler |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN112343591A true CN112343591A (en) | 2021-02-09 |
Family
ID=74360320
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011020975.2A Pending CN112343591A (en) | 2020-09-24 | 2020-09-24 | Anti-freezing sampler |
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| Country | Link |
|---|---|
| CN (1) | CN112343591A (en) |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2711388Y (en) * | 2004-07-29 | 2005-07-20 | 福建省南安市新达阀门厂 | Freeze-proofing sampling valve for water-injection well |
| CN203239340U (en) * | 2013-03-01 | 2013-10-16 | 中国石油天然气股份有限公司 | Needle-tube-type freeze-proof sampling valve |
| CN203847107U (en) * | 2014-04-30 | 2014-09-24 | 福建新达阀门有限公司 | Anti-freezing sampling device of injection and production well mouth |
| US20150204762A1 (en) * | 2014-01-22 | 2015-07-23 | Saudi Arabian Oil Company | Sampling and blockage removal tool |
| CN205117271U (en) * | 2015-11-12 | 2016-03-30 | 金湖县支点石油科技有限责任公司 | Multi -functional frostproofing theftproof sampling device |
| CN209802736U (en) * | 2019-03-21 | 2019-12-17 | 云南电力技术有限责任公司 | Auxiliary sampling device for insulating oil |
-
2020
- 2020-09-24 CN CN202011020975.2A patent/CN112343591A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2711388Y (en) * | 2004-07-29 | 2005-07-20 | 福建省南安市新达阀门厂 | Freeze-proofing sampling valve for water-injection well |
| CN203239340U (en) * | 2013-03-01 | 2013-10-16 | 中国石油天然气股份有限公司 | Needle-tube-type freeze-proof sampling valve |
| US20150204762A1 (en) * | 2014-01-22 | 2015-07-23 | Saudi Arabian Oil Company | Sampling and blockage removal tool |
| CN203847107U (en) * | 2014-04-30 | 2014-09-24 | 福建新达阀门有限公司 | Anti-freezing sampling device of injection and production well mouth |
| CN205117271U (en) * | 2015-11-12 | 2016-03-30 | 金湖县支点石油科技有限责任公司 | Multi -functional frostproofing theftproof sampling device |
| CN209802736U (en) * | 2019-03-21 | 2019-12-17 | 云南电力技术有限责任公司 | Auxiliary sampling device for insulating oil |
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