CN113503159A - General pilot production tool for downhole sampling - Google Patents
General pilot production tool for downhole sampling Download PDFInfo
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- CN113503159A CN113503159A CN202110867295.2A CN202110867295A CN113503159A CN 113503159 A CN113503159 A CN 113503159A CN 202110867295 A CN202110867295 A CN 202110867295A CN 113503159 A CN113503159 A CN 113503159A
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- clapboards
- partition plate
- crude oil
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- 238000005070 sampling Methods 0.000 title claims abstract description 67
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 16
- 239000010779 crude oil Substances 0.000 claims abstract description 49
- 238000007789 sealing Methods 0.000 claims abstract description 11
- 238000005192 partition Methods 0.000 claims description 76
- 230000000670 limiting effect Effects 0.000 claims description 27
- 239000003921 oil Substances 0.000 abstract description 3
- 238000000034 method Methods 0.000 description 8
- 230000008901 benefit Effects 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 238000003780 insertion Methods 0.000 description 4
- 230000037431 insertion Effects 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 239000007788 liquid Substances 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- 238000010276 construction Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000007667 floating Methods 0.000 description 1
- 238000005065 mining Methods 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
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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
- 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
- E21B49/081—Obtaining fluid samples or testing fluids, in boreholes or wells with down-hole means for trapping a fluid sample
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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)
- Sampling And Sample Adjustment (AREA)
Abstract
The invention belongs to the field of downhole tools of oil fields, and particularly relates to a general pilot production tool for downhole sampling, which comprises an upper joint, a sampling cylinder and a lower joint, wherein a sample chamber for containing a crude oil sample is arranged in the sampling cylinder; three clapboards are arranged in the sampling cylinder and are in sliding sealing fit with the inner wall of the sampling cylinder; check valves for crude oil to pass through the clapboards upwards are arranged on the three clapboards; the density of the three clapboards is less than that of the crude oil; the three clapboards are respectively called as an upper clapboard, a middle clapboard and a lower clapboard from top to bottom. According to the invention, the three clapboards are arranged, so that a crude oil sample entering the sampling cylinder from the lower joint can be divided into three parts, the length-diameter ratio of the sample chamber is reduced, and the integral uniformity of all samples in the sampling cylinder is improved.
Description
Technical Field
The invention belongs to the field of oil field downhole tools, and particularly relates to a general trial production tool for downhole sampling.
Background
The general pilot production tool is an important tool for pilot production in oil field production. The pilot sampling tool is one of the more common ones. The pilot production sampling tool is used for sampling crude oil at a downhole stratum and then lifting the collected sample to the ground for laboratory analysis so as to accurately obtain raw data of the crude oil.
In the sampling tool for pilot production, a space for containing a sample (called a "sample chamber") is cylindrical, and in the prior art, in order to obtain a sufficient amount of sample, the sample chamber needs to have a large length-diameter ratio, so that components in the sample are not uniformly distributed in the axial direction of the sample chamber, and in such a case, when a worker divides the sample into a plurality of parts to study, the components of each part of the sample are greatly different, and are obviously deviated from the actual condition of crude oil in a stratum. Therefore, it is necessary to develop a new sampling tool to solve the above problems.
In addition, in the prior art, the pilot production sampling tool needs to be matched with an underground jet pump for use, negative pressure is generated through the jet action of the underground jet pump, and crude oil is sucked into the pilot production sampling tool by utilizing the negative pressure. In the implementation of the process, a large pump truck and a water tank truck are required to be arranged on the ground to drive the jet pump to work, so that the construction cost is high. Therefore, it is necessary to develop a pilot mining sampling process with lower construction cost.
Disclosure of Invention
The present invention provides a general pilot production tool for downhole sampling to solve the problems set forth in the background above.
The technical problem solved by the invention is realized by adopting the following technical scheme: the invention provides a general pilot production tool for underground sampling, which comprises an upper joint, a sampling cylinder and a lower joint, wherein a sample chamber for containing a crude oil sample is arranged in the sampling cylinder;
three clapboards are arranged in the sampling cylinder and are in sliding sealing fit with the inner wall of the sampling cylinder; check valves for crude oil to pass through the clapboards upwards are arranged on the three clapboards; the density of the three clapboards is less than that of the crude oil;
the three clapboards are respectively called as an upper clapboard, a middle clapboard and a lower clapboard from top to bottom;
the three sample chambers are respectively positioned between the upper partition plate and the middle partition plate, between the middle partition plate and the lower partition plate, and between the lower partition plate and the lower connector;
and soft ropes are connected between the middle partition plate and the lower partition plate and between the lower partition plate and the lower joint.
Preferably, the conduction directions of the check valves on the three partition plates are all from bottom to top.
As the preferred scheme, the conduction directions of the check valves on the three clapboards are all from top to bottom, and meanwhile, the upper end of the soft rope is connected to the valve ball in the check valve on the corresponding clapboard.
As a preferable scheme, the general trial production tool for underground sampling further comprises a driving rod and a limiting piston, wherein the driving rod and the limiting piston are installed in the sampling cylinder, the driving rod is inserted in a through hole in the center of the upper joint in a sliding and sealing mode, a sliding block capable of sliding along the radial direction of the limiting piston is arranged on the upper end face of the limiting piston, one end of the sliding block is inserted in a plug hole in the inner wall of the sampling cylinder, the other end of the sliding block is matched with the lower end of the driving rod through an inclined plane, the lower end face of the limiting piston abuts against the upper end face of the upper partition plate, so that the three partition plates are limited to slide upwards after descending, a closed space between the limiting piston and the upper joint is called as a negative pressure cavity, air is filled in the negative pressure cavity, the air pressure is not greater than standard atmospheric pressure, and after the driving rod slides downwards, the sliding block moves towards the direction close to a central line along the diameter direction of the limiting piston under the guiding action of the inclined plane, thereby relieving the limit action of the slide block on the limit piston and enabling the limit piston and the three clapboards to move upwards under the action of negative pressure.
The invention has the beneficial effects that:
1. according to the invention, the three clapboards are arranged, so that a crude oil sample entering the sampling cylinder from the lower connector is divided into three parts, the length-diameter ratio of the sample chamber is reduced, the integral uniformity of all samples in the sampling cylinder is improved, the components of the sample reaching a laboratory are closer to the original actual conditions in a stratum, and the experimental analysis result is more accurate.
2. Through setting up "the density of baffle all is less than the density of crude oil", "between median septum and the lower baffle, all be connected with the cord between lower baffle and the lower clutch", "all be provided with the check valve on the baffle", "the direction of switching on of the check valve on three baffles is from bottom to top" and other technical characteristics, will get into the ingenious division of crude oil sample in the sampling tube in three independent sample room, design benefit, simple structure, excellent in use effect.
3. The invention also provides another implementation scheme: the conduction direction of the check valves on the three clapboards is changed from top to bottom, and the upper end of the soft rope is connected to the valve ball in the check valve on the corresponding clapboard. The benefits of this approach are:
crude oil samples directly collected downhole often contain gas components, which are not negligible in experimental analysis of the crude oil samples. In the underground high-temperature and high-pressure environment, gas components are dissolved in liquid crude oil, after a crude oil sample is lifted to the ground along with the underground high-temperature and high-pressure environment, the solubility of the gas components in the crude oil sample is reduced due to the reduction of pressure and temperature, so that the gas components are separated out from the original sample.
4. In order to ensure that the crude oil sample can still smoothly enter the three sample chambers under the condition that the check valves on the three clapboards cannot be communicated in the direction from bottom to top, the invention creatively connects the upper ends of the soft ropes to the valve balls of the check valves, thereby ensuring that the check valves on the three clapboards are reversely communicated under the action of the negative pressure on the upper side and finally ensuring that the crude oil sample smoothly enters the three sample chambers.
After the structure is adopted, when the upper side of the upper partition plate has no negative pressure, the upper partition plate, the middle partition plate and the lower partition plate are all positioned at the lower limit position; when negative pressure is generated on the upper side of the upper partition plate, the upper partition plate starts to slide upwards along the inner wall of the sampling tube, and meanwhile, as the conduction directions of the check valves on the three partition plates are all from top to bottom, the space between the upper partition plate and the middle partition plate and the space between the middle partition plate and the lower partition plate are kept closed in the upward movement process of the upper partition plate, so that the middle partition plate and the lower partition plate both move upwards along with the upper partition plate under the action of the negative pressure; in the process that the three clapboards move upwards, underground crude oil enters a space between the lower clapboard and the lower connector through a channel on the lower connector until a soft rope between the lower clapboard and the lower connector is pulled into a straight line; then, under the action of negative pressure on the upper side of the lower partition plate and the buoyancy of crude oil, the upper partition plate continues to move upwards, and under the condition that a valve ball of a check valve on the lower partition plate is limited by a soft rope, the check valve on the lower partition plate is opened, so that the crude oil can flow upwards into a space between the middle partition plate and the lower partition plate; similarly, crude oil is allowed to enter the space between the upper partition and the middle partition, thereby filling the three sample chambers.
5. The invention uses the difference value between the standard atmospheric pressure and the underground pressure to automatically form negative pressure in the negative pressure cavity after the underground sampling, and provides power for sampling by using the suction effect of the negative pressure in the negative pressure cavity. Compared with the prior art that the jet pump generates negative pressure, the jet pump does not need to be equipped, and a large-scale pump truck and a water tank truck for driving the jet pump to work do not need to be equipped, so that the sampling cost can be greatly reduced.
Drawings
FIG. 1 is a schematic diagram of the present invention after sampling;
FIG. 2 is a schematic diagram of the structure shown in the figure before sampling;
FIG. 3 is a schematic structural diagram of a second embodiment of the present invention;
FIG. 4 is a schematic structural view of a third embodiment of the present invention;
fig. 5 is a partially enlarged view of a portion a in fig. 3.
In the figure: 1. an upper joint; 2. a sampling tube; 3. an upper partition plate; 4. a middle partition plate; 5. a lower partition plate; 6. a flexible cord; 7. a sample chamber; 8. a one-way valve; 9. a lower joint; 10. a valve ball; 11. a limit piston; 12. a slider; 13. a spring A; 14. a drive rod; 15. a spring B; 16. a negative pressure chamber.
In the figure: the black picture block filling part is an O-shaped sealing ring.
Detailed Description
The invention is further described below with reference to the accompanying drawings:
the first embodiment is as follows:
as shown in fig. 1, the present embodiment includes an upper joint 1, a sampling barrel 2 and a lower joint 9, a sample chamber 7 for containing crude oil samples is provided inside the sampling barrel 2, a check valve 8 is provided in the lower joint 9, and the conduction direction of the check valve 8 is from bottom to top, and the upper joint 1 and the lower joint 9 are respectively fixedly connected to the upper end and the lower end of the sampling barrel 2 through threads. The above is the existing structure in the prior art, and is not described in detail herein.
As shown in fig. 1, three partition plates are arranged in the sampling tube 2, and are in sliding sealing fit with the inner wall of the sampling tube 2; check valves 8 for crude oil to pass through the clapboards upwards are arranged on the three clapboards; the density of the three clapboards is less than that of the crude oil; the three clapboards are respectively called as an upper clapboard 3, a middle clapboard 4 and a lower clapboard 5 from top to bottom; the number of the sample chambers 7 is three, and the three sample chambers 7 are respectively positioned between the upper partition plate 3 and the middle partition plate 4, between the middle partition plate 4 and the lower partition plate 5, and between the lower partition plate 5 and the lower connector 9; and soft ropes 6 are connected between the middle partition plate 4 and the lower partition plate 5 and between the lower partition plate 5 and the lower joint 9. According to the invention, the three clapboards are arranged, so that a crude oil sample entering the sampling cylinder 2 from the lower connector 9 is divided into three parts, the length-diameter ratio of the sample chamber 7 is reduced, the integral uniformity of all samples in the sampling cylinder 2 is improved, the components of the sample reaching a laboratory are closer to the original actual conditions in a stratum, and the experimental analysis result is more accurate.
As shown in fig. 1 and fig. 2, by setting the technical characteristics of "the density of the partition is less than the density of crude oil", "the middle partition 4 and the lower partition 5 are connected with a soft rope 6, the lower partition 5 and the lower joint 9 are connected with a check valve 8", the conduction directions of the check valves 8 on the three partitions are from bottom to top ", and the like, crude oil samples entering the sampling cylinder 2 are skillfully separated in three independent sample chambers 7, and the device has the advantages of ingenious design, simple structure and good use effect.
Before descending the well, the positions of the three clapboards in the sampling cylinder 2 are shown in figure 2, after descending the well, a jet pump is started to enable the upper part of the upper clapboard 3 to generate negative pressure, the underground crude oil enters a channel in the center of the lower joint 9 under the action of the negative pressure and then flows upwards, in the flowing process, the three floating boards gradually float under the action of buoyancy, finally the three sample chambers 7 are filled, and the position states of the three clapboards in the sampling cylinder 2 after the sample chambers 7 are filled are shown in figure 1.
Example two:
as shown in fig. 3, the present embodiment is different from the first embodiment only in that: the conduction direction of the check valves 8 on the three clapboards is changed from top to bottom, and meanwhile, the upper ends of the soft ropes 6 are connected to the valve balls 10 in the check valves 8 on the corresponding clapboards.
The benefits of this approach are:
crude oil samples directly collected downhole often contain gas components, which are not negligible in experimental analysis of the crude oil samples. In the underground high-temperature and high-pressure environment, gas components are dissolved in liquid crude oil, after a crude oil sample is lifted to the ground along with the underground high-temperature and high-pressure environment, the solubility of the gas components in the crude oil sample is reduced due to the reduction of pressure and temperature, so that the gas components are separated out from the original sample, and in order to keep the gas components in the crude oil sample, the conduction direction of the check valves 8 on the three partition plates is changed into the top-down direction, so that the separation and the leakage of the gas are effectively limited.
As shown in FIG. 4, in order to ensure that the crude oil sample can smoothly enter the three sample chambers 7 after the conducting direction of the check valves 8 on the three clapboards is changed from top to bottom, the invention creatively connects the upper end of the flexible rope 6 to the valve ball 10 of the check valve 8, thereby reversely conducting the check valves 8 on the three clapboards under the action of the negative pressure on the upper side, and finally ensuring that the crude oil sample can smoothly enter the three sample chambers 7.
After the structure is adopted, when the upper side of the upper partition plate 3 has no negative pressure, the upper partition plate 3, the middle partition plate 4 and the lower partition plate 5 are all positioned at the lower limit position; after the upper side of the upper clapboard 3 generates negative pressure, the upper clapboard 3 starts to slide upwards along the inner wall of the sampling tube 2, meanwhile, as the conduction directions of the check valves 8 on the three clapboards are all from top to bottom, the space between the upper clapboard 3 and the middle clapboard 4 and the space between the middle clapboard 4 and the lower clapboard 5 are kept closed in the upward movement process of the upper clapboard 3, so that the middle clapboard 4 and the lower clapboard 5 both move upwards along with the upper clapboard 3 under the action of the negative pressure; in the process that the three clapboards move upwards, underground crude oil enters a space between the lower clapboard 5 and the lower connector 9 through a channel on the lower connector 9 until the soft rope 6 between the lower clapboard 5 and the lower connector 9 is pulled into a straight line; after that, under the action of the negative pressure on the upper side of the lower clapboard 5 and the buoyancy of the crude oil, the upper clapboard 3 continues to move upwards, and under the condition that the valve ball 10 of the check valve 8 on the lower clapboard 5 is limited by the soft rope 6, the check valve 8 on the lower clapboard 5 is opened, so that the crude oil can flow upwards into the space between the middle clapboard 4 and the lower clapboard 5; similarly, crude oil is allowed to enter the space between the upper partition 3 and the middle partition 4, thereby filling the three sample chambers 7.
In specific implementation, the density of the three partition plates in the embodiment can be reset to ensure that the density is not less than the density of crude oil, so that the check valves 8 on the three partition plates can be completely closed after sampling is finished, and the three sample chambers 7 are completely independent and sealed. It should be noted that the density of the partition plate should not be too large, which is not more than 1.5 times of the density of the crude oil, and the diameter of the check valve on the partition plate should not be too large (as a preferable scheme, the diameter of the check valve on the partition plate is not more than 7mm, and the diameter of the partition plate is not less than 80mm), so that the partition plate can be guaranteed to surge upwards under the action of the liquid flow during the sampling process.
Example three:
as shown in fig. 4, the present embodiment is different from the second embodiment in that: in the embodiment, the negative pressure cavity 16 is additionally arranged, and compared with the prior art that the jet pump generates negative pressure, the jet pump is not required to be arranged, and a large-scale pump truck and a water tank truck for driving the jet pump to work are not required to be arranged, so that the sampling cost can be greatly reduced.
As shown in figure 4, in order to control the time when the negative pressure acts on the three clapboards, the invention is additionally provided with a driving rod 14 and a limiting piston 11, the driving rod 14 and the limiting piston 11 are both arranged in the sampling cylinder 2, the driving rod 14 is inserted in a through hole in the center of the upper joint 1 in a sliding and sealing manner, a slide block 12 capable of sliding along the radial direction of the limiting piston 11 is arranged on the upper end surface of the limiting piston 11, one end of the slide block 12 is inserted in an insertion hole on the inner wall of the sampling cylinder 2, the other end of the slide block 12 is matched with the lower end of the driving rod 14 through an inclined surface, the lower end surface of the limiting piston 11 is abutted against the upper end surface of the upper clapboard 3, so that the three clapboards are limited to slide upwards after descending, the closed space where the limiting piston 11 is located is called as a negative pressure cavity 16, the negative pressure cavity 16 is filled with air, and the air pressure is not more than the standard atmospheric pressure.
When the underground heavy-duty driving device works, the upper end of the driving rod 14 is impacted in a mode of putting heavy objects underground, so that the driving rod 14 moves downwards; after the driving rod 14 slides downwards, the sliding block 12 moves towards the direction close to the central line along the diameter direction of the limiting piston 11 under the guiding action of the inclined surface, so that the limiting action of the sliding block 12 on the limiting piston 11 is released, and the limiting piston 11 and the three clapboards can move upwards under the action of negative pressure.
The invention utilizes the difference value of the standard atmospheric pressure and the underground pressure to automatically form negative pressure in the negative pressure cavity 16 after the underground sampling, and provides power for sampling by utilizing the suction effect of the negative pressure in the negative pressure cavity 16.
As shown in fig. 4, in order to prevent the insertion holes corresponding to the sliding blocks 12 on the inner wall of the sampling tube 2 from affecting the three sliding plates to disable the sealing between the inner walls of the sampling tube 2, two sealing rings need to be disposed on the outer side of each partition plate, and the minimum distance between the two sealing rings is not less than the width of the insertion holes in the vertical direction. In order to ensure that the sliding block 12 is stably inserted into the insertion hole, the other side of the sliding block 12 needs to be provided with a spring A13, and the sliding block 12 always keeps a moving trend of approaching the inner wall of the sampling tube 2 under the elastic force of the spring A13. In order to prevent the driving rod 14 from accidentally triggering the slider 12, a spring B15 may be additionally arranged in the upper joint 1, and the driving rod 14 always keeps away from the movement trend of the slider 12 under the action of the elastic force of the spring B15.
Claims (4)
1. The utility model provides a general pilot production instrument for sample in pit, includes top connection (1), sampler barrel (2) and lower clutch (9), and inside sample room (7) that are used for splendid attire crude oil sample that are provided with of sampler barrel (2), the direction of switching on that is provided with check valve (8) and this check valve (8) in lower clutch (9) is from bottom to top, its characterized in that: the upper joint (1) and the lower joint (9) are fixedly connected to the upper end and the lower end of the sampling cylinder (2) through threads respectively;
three clapboards are arranged in the sampling cylinder (2), and are in sliding sealing fit with the inner wall of the sampling cylinder (2); check valves (8) for crude oil to pass through the clapboards upwards are arranged on the three clapboards; the density of the three clapboards is less than that of the crude oil;
the three clapboards are respectively called as an upper clapboard (3), a middle clapboard (4) and a lower clapboard (5) from top to bottom;
the number of the sample chambers (7) is three, and the three sample chambers (7) are respectively positioned between the upper partition plate (3) and the middle partition plate (4), between the middle partition plate (4) and the lower partition plate (5), and between the lower partition plate (5) and the lower connector (9);
soft ropes (6) are connected between the middle partition plate (4) and the lower partition plate (5) and between the lower partition plate (5) and the lower joint (9).
2. A general pilot tool for downhole sampling according to claim 1, wherein: the conduction directions of the check valves (8) on the three clapboards are all from bottom to top.
3. A general pilot tool for downhole sampling according to claim 1, wherein: the direction of opening of check valve (8) on three baffles is from top to bottom, simultaneously, the upper end of flexible rope (6) is connected on valve ball (10) in check valve (8) on the corresponding baffle.
4. A general pilot tool for downhole sampling according to claim 3, wherein: the general trial production tool for underground sampling further comprises a driving rod (14) and a limiting piston (11), wherein the driving rod (14) and the limiting piston (11) are installed in the sampling cylinder (2), the driving rod (14) is inserted into a through hole in the center of the upper connector (1) in a sliding and sealing mode, a sliding block (12) capable of sliding along the upper end face of the limiting piston (11) in the radial direction is arranged on the upper end face of the limiting piston, one end of the sliding block (12) is inserted into a jack in the inner wall of the sampling cylinder (2), the other end of the sliding block (12) is matched with the lower end of the driving rod (14) through an inclined face, the lower end face of the limiting piston (11) abuts against the upper end face of the upper partition plate (3), so that three partition plates are limited to slide upwards after descending, a closed space where the limiting piston (11) is located is called as a negative pressure cavity (16), air is filled in the negative pressure cavity (16), the air pressure is not greater than standard atmospheric pressure, and after the driving rod (14) slides downwards, the sliding block (12) moves towards the direction close to the central line along the diameter direction of the limiting piston (11) under the guiding action of the inclined plane, so that the limiting action of the sliding block (12) on the limiting piston (11) is released, and the limiting piston (11) and the three clapboards can move upwards under the negative pressure action.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110867295.2A CN113503159A (en) | 2021-07-30 | 2021-07-30 | General pilot production tool for downhole sampling |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110867295.2A CN113503159A (en) | 2021-07-30 | 2021-07-30 | General pilot production tool for downhole sampling |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN113503159A true CN113503159A (en) | 2021-10-15 |
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ID=78015263
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110867295.2A Withdrawn CN113503159A (en) | 2021-07-30 | 2021-07-30 | General pilot production tool for downhole sampling |
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| Country | Link |
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| CN (1) | CN113503159A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114961718A (en) * | 2022-06-08 | 2022-08-30 | 东营愉沁石油科技有限公司 | Oil field downhole sampler with good sealing performance |
| WO2024015156A1 (en) * | 2022-07-13 | 2024-01-18 | Halliburton Energy Services, Inc. | Large count microsampler |
-
2021
- 2021-07-30 CN CN202110867295.2A patent/CN113503159A/en not_active Withdrawn
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114961718A (en) * | 2022-06-08 | 2022-08-30 | 东营愉沁石油科技有限公司 | Oil field downhole sampler with good sealing performance |
| WO2024015156A1 (en) * | 2022-07-13 | 2024-01-18 | Halliburton Energy Services, Inc. | Large count microsampler |
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Application publication date: 20211015 |