CN110735625A - online desanding device for oil and gas pipeline without stopping transmission - Google Patents
online desanding device for oil and gas pipeline without stopping transmission Download PDFInfo
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- CN110735625A CN110735625A CN201810795034.2A CN201810795034A CN110735625A CN 110735625 A CN110735625 A CN 110735625A CN 201810795034 A CN201810795034 A CN 201810795034A CN 110735625 A CN110735625 A CN 110735625A
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- 230000005540 biological transmission Effects 0.000 title description 3
- 239000004576 sand Substances 0.000 claims abstract description 141
- 238000000926 separation method Methods 0.000 abstract description 9
- 230000000694 effects Effects 0.000 abstract description 7
- 238000009434 installation Methods 0.000 abstract description 4
- 230000007547 defect Effects 0.000 abstract description 2
- 239000012535 impurity Substances 0.000 description 26
- 239000007787 solid Substances 0.000 description 24
- 239000007789 gas Substances 0.000 description 19
- 239000003921 oil Substances 0.000 description 15
- 239000007788 liquid Substances 0.000 description 8
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 8
- 238000000034 method Methods 0.000 description 8
- 238000007599 discharging Methods 0.000 description 6
- 239000010779 crude oil Substances 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 4
- 239000003345 natural gas Substances 0.000 description 4
- 230000033001 locomotion Effects 0.000 description 3
- 238000004062 sedimentation Methods 0.000 description 3
- 238000012423 maintenance Methods 0.000 description 2
- 230000005012 migration Effects 0.000 description 2
- 238000013508 migration Methods 0.000 description 2
- 210000000664 rectum Anatomy 0.000 description 2
- 239000010963 304 stainless steel Substances 0.000 description 1
- 229910000589 SAE 304 stainless steel Inorganic materials 0.000 description 1
- 238000005299 abrasion Methods 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 238000011982 device technology Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000008187 granular material Substances 0.000 description 1
- 239000003673 groundwater Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000003129 oil well Substances 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
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-
- 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
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/34—Arrangements for separating materials produced by the well
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D21/00—Separation of suspended solid particles from liquids by sedimentation
- B01D21/24—Feed or discharge mechanisms for settling tanks
- B01D21/245—Discharge mechanisms for the sediments
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D21/00—Separation of suspended solid particles from liquids by sedimentation
- B01D21/26—Separation of sediment aided by centrifugal force or centripetal force
- B01D21/262—Separation of sediment aided by centrifugal force or centripetal force by using a centrifuge
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- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
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- Mining & Mineral Resources (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
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Abstract
The invention discloses an online desanding device without stopping transportation for oil and gas pipelines, which overcomes the defects of complex installation, poor separation effect and the like in the prior art and comprises a desanding device inlet, a desanding device outlet, a desanding device cylinder, a columnar cylinder, a spiral blade, a stop-rotating fan plate, a sand discharge port and a full-diameter ball valve, wherein the columnar cylinder is positioned in the desanding device cylinder and coaxially installed with the desanding device cylinder, the spiral blade is positioned in an annular space between the desanding device cylinder and the columnar cylinder to form a spiral flow passage, the stop-rotating fan plate is positioned in the desanding device cylinder, the sand discharge port is arranged below the desanding device cylinder in rows, and the sand discharge port is communicated with a sand storage chamber through the full-diameter ball valve and a sand inlet in sequence.
Description
Technical Field
The invention belongs to the technical field of centrifugal separation and flow guarantee, and relates to an online sand removing device for oil-gas pipelines without stopping transmission.
Background
In the oil and gas exploitation process, solid impurities such as mud and sand are inevitably carried, and particularly, the phenomenon is increasingly serious along with the application of new technologies such as hydraulic fracturing and polymer flooding.
The existence of solid impurities can cause adverse effects on the normal operation of downstream oil-gas treatment facilities such as a three-phase separator, strong abrasion is caused to an inner anticorrosive coating of the inner wall of a pipeline, the normal operation of a power facility pump and a compressor is highly sensitive to the solid impurities, and the high-efficiency solid-liquid and gas-solid separation facility has important significance. The current main means for separating solid impurities comprises natural sedimentation and cyclone separation, wherein the natural sedimentation takes long time, the occupied area of a sedimentation tank is large, the cyclone separation mainly separates the solid impurities by means of a centrifugal force field, the occupied area is small, and various structural forms are developed according to different application occasions, so that the solid impurities have advantages and disadvantages.
A related device for removing sand by using a spiral structure is precedent, for example, a Chinese patent with application number of 96118733.6 discloses a crude oil wellhead pipe flow sand remover which comprises an spiral pipeline, a sand outlet is arranged at the end port of the spiral pipeline, a wedge is arranged at the intersection of the pipeline and the sand outlet and can directly remove sand from the pipeline by means of residual energy of an oil well without external driving force, the Chinese patent with application number of 201410815080.6 discloses a spiral sand remover which comprises a spiral separating pipe, a sand outlet short section, a replacement sand storage tank and a spiral separating pipe mounting frame, a feed inlet at the lower end of the spiral separating pipe is connected with a shaft bottom return liquid pipeline, a liquid outlet at the upper end of the spiral separating pipe is connected with a ground water collecting pipeline, a plurality of blocking type sand outlets are arranged on the outer peripheral surface of the spiral separating pipe, each sand outlet is communicated with a closed replacement sand storage tank through a pipeline, a sand discharging outlet is arranged at the bottom of the replacement sand storage tank, sand-containing reverse drainage liquid enters a feed inlet at the lower end of the spiral separating pipe, the spiral separating pipe and flows upwards at a high speed, sand particles in a spiral separating pipe are discharged into a coarse sand storage tank along the spiral separating wall of the spiral separating pipe, the sand storage tank is reasonably limited by the spiral separating effect of the spiral separating liquid separating pipe, the spiral separating pipe is too coarse sand-separating pipe, the spiral separating pipe, the sand-separating liquid discharging sand-discharging.
Disclosure of Invention
The invention provides new online desanding device technology without stopping conveying of oil and gas pipelines aiming at the defects of complex installation, poor separation effect and the like in the prior art, when the technology is used, the installation mode of the desanding device is the same as that of a common valve , the desanding device can be installed in the horizontal or vertical direction, no extra space is occupied, no auxiliary facilities are needed, the separation efficiency is high, and the normal conveying of the pipelines is not influenced in the sand cleaning process while the solid impurities in oil and gas are efficiently separated.
The invention provides an online desanding device without stopping transportation of an oil and gas pipeline, which comprises a desanding device inlet, a desanding device outlet and a sand storage chamber and is characterized by further comprising a desanding device barrel, a columnar cylinder, a spiral blade, a stop-rotating fan plate, a sand inlet, a sand discharge port and a full-diameter ball valve, wherein the desanding device barrel is of a cylinder structure with flange joints at two ends, the two flange joints are the desanding device inlet and the desanding device outlet respectively, the columnar cylinder is positioned between the desanding device barrel and coaxially arranged, the spiral blade is positioned in an annular space between the desanding device barrel and the columnar cylinder to form a spiral flow passage, the stop-rotating fan plate is positioned in the desanding device barrel and is arranged between the columnar cylinder and the desanding device outlet and uniformly arranged along the circumferential direction of the desanding device barrel, the sand discharge port rows of sand discharge ports are arranged below the desanding device barrel and are communicated with the sand storage chamber sequentially through the full-diameter ball valve and the sand inlet.
steps are technically characterized in that the spiral blade is a structure formed by flat spiral rotation, the outer side of the spiral blade is welded on the inner wall of the barrel body of the sand removal device, the inner side of the spiral blade is welded on the outer wall of the cylindrical barrel, the spiral inclination angle of the spiral blade is between 5 and 15 degrees, if the inclination angle is too small, the flow channel is narrow, the migration distance of sand grains is increased under the same flow area, if the inclination angle is too large, the space length occupied by the spiral blade in the barrel body of the sand removal device is increased under the same spiral turns, and impurities such as sand are thrown to the inner wall surface of the barrel body of the sand removal device under the action of a centrifugal force field in the flowing process of incoming.
The step of the invention is technically characterized in that rows of sand discharge ports are arranged below a barrel body of the sand removing device and are arranged at the bottom of a spiral flow channel at equal intervals to serve as openings for solid and liquid impurities to enter a sand storage chamber, the number of the sand discharge ports is about 3-5, the diameter of the sand discharge ports is 0.1-0.3 times of the diameter of the barrel body of the sand removing device, and the sand discharge ports can be ensured to have enough opportunity to enter the sand storage chamber.
The step of the invention is technically characterized in that the cylindrical cylinder is of a cylinder structure with two closed ends, the outer wall of the cylindrical cylinder is fixed on the inner side of the helical blade, the diameter of the cylindrical cylinder is 0.5-0.8 time of the diameter of the barrel of the desanding device, and the cylindrical length of the cylindrical cylinder is 1-5 times of the diameter of the barrel of the desanding device.
The step of the invention is technically characterized in that the sand storage chamber is a horizontal cylinder structure with circular end sockets at two ends, a sand inlet corresponding to a sand discharge port is usually arranged right above the sand storage chamber, the sand discharge port and the sand inlet are connected through a full-bore ball valve, the full-bore ball valve does not form a throttling effect on a runner and does not block the movement of separated solid impurities to the sand storage chamber, and the volume of the sand storage chamber is required to ensure the maintenance period of 3-6 months.
the method is technically characterized in that the rotation stopping fan plate is of a rectangular structure, the long edge of the rotation stopping fan plate is welded on the inner wall of a barrel body of the sand removing device, the short edge of the rotation stopping fan plate points to the center of the barrel body of the sand removing device in a centripetal mode, a plurality of rotation stopping fan plates are evenly arranged at equal circumferential angles, the length of the long edge of the rotation stopping fan plate is 1-2 times of the inner diameter of the barrel body of the sand removing device, the width of the long edge of the rotation stopping fan plate is 0.2-0.5 times of the inner diameter of the barrel body of the sand removing device, and the number of the.
The method for desanding the natural gas by adopting the online desanding device without stopping the oil and gas pipeline comprises the steps of firstly enabling a crude oil or natural gas medium containing solid impurities to enter a desanding device cylinder body through an inlet of the desanding device to perform spiral motion in a spiral blade, the solid impurities in the spiral flow passage are transported to the inner wall surface of the barrel body of the desanding device under the action of centrifugal force, the solid impurities transported to the inner wall surface of the barrel body of the desanding device flow out of the barrel body of the desanding device through the sand discharging port, then enters a sand storage chamber through a full-bore ball valve and a sand inlet for storage, oil gas which does not contain solid impurities after spiral desanding flows to the downstream of the desanding device after the tangential velocity of the oil gas is eliminated by a rotation stopping fan plate, when solid impurities are cleaned, the full-bore ball valve which is communicated with the barrel body of the sand removing device and the sand storage chamber is closed, the sand storage chamber is taken down, after solid impurities in the sand storage chamber are removed through the inverted sand inlet, the full-bore ball valve is opened after the sand storage chamber is installed and fixed again.
Compared with the prior art, the invention has the advantages that (1) the technology adopts a helical blade centrifugal separation mode, has high separation efficiency and is suitable for oil, gas or oil-gas mixed transportation pipelines, (2) no filter member is adopted in the structure of the technology, and the trouble of internal blockage of the sand removing device can be permanently removed, and (3) the oil-gas pipelines on-line sand removing device does not stop transportation, has the same installation mode as a common valve , can be installed in the horizontal or vertical direction, does not occupy extra space, and does not need auxiliary facilities.
The structural layout, operation flow, etc. of the present invention will be described in further detail in with reference to the drawings and the detailed description, but not to limit the scope of the invention.
Drawings
FIG. 1 is a schematic structural diagram of an on-line sand removing device for oil and gas pipelines without stopping transportation.
FIG. 2 is a three-dimensional view of the barrel of the sand removing device in the on-line sand removing device without stopping the transportation of oil and gas pipelines.
FIG. 3 is a three-dimensional view of the helical blade in the online sand removing device without stopping the transportation of oil and gas pipelines.
Fig. 4 is a view from a-a in fig. 1.
Like reference numerals in fig. 1 to 4 denote like features.
Wherein, in FIGS. 1-4: 1-inlet of sand removing device, 2-outlet of sand removing device, 3-barrel of sand removing device, 4-helical blade, 5-column cylinder, 6-stop fan plate, 7-sand discharging port, 8-full-bore ball valve, 9-sand inlet and 10-sand storage chamber.
Detailed Description
Referring to the attached drawings 1-4, kinds of oil and gas pipeline non-stop online desanding devices comprise a desanding device inlet 1, a desanding device cylinder 3, a cylindrical cylinder 5, a helical blade 4, a stop-rotating fan plate 6, a sand discharge port 7, a full-diameter ball valve 8 and a desanding device outlet 2, wherein the desanding device cylinder 3 is of a cylinder structure with flange joints at two ends, the two flange joints are the desanding device inlet 1 and the desanding device outlet 2 respectively, the cylindrical cylinder 5 is positioned inside the desanding device cylinder 3 and coaxially mounted with the desanding device cylinder 3, the helical blade 4 is positioned in an annular space between the desanding device cylinder 3 and the cylindrical cylinder 5 to form a helical flow channel, the stop-rotating fan plate 6 is positioned in the desanding device cylinder 3 and mounted between the cylindrical cylinder 5 and the desanding device outlet 2 and uniformly arranged along the circumferential direction of the desanding device cylinder 3, the sand discharge port 7 is arranged below the desanding device cylinder 3 in a row, and is communicated with a sand storage chamber 10 sequentially through the full-diameter fan plate 8 and a sand inlet 9.
The helical blade 4 is the rotatory structure that forms of dull and stereotyped heliciform, the helical blade 4 outside welds in the 3 inner walls of sand removal device barrel, the inboard welds in the outer wall of column drum 5, helical blade 4's spiral inclination is between 5 ~ 15 generally, the runner is narrow then to the undersize, the migration distance of sand grain has been increased under the same flow area, too big then increased helical blade 4 under the same spiral number of turns and taken the space length of sand removal device barrel 3. the incoming flow oil gas is at the internal face of helical channel flow in-process owing to the effect of centrifugal force field with impurity such as sand to get rid of to sand removal device barrel 3.
Arrange sand mouth 7 and become row and install in sand removal device barrel 3 below, the equidistant bottom of arranging in spiral flow channel gets into the opening of sand storage chamber 10 as solid-liquid impurity, arrange sand mouth 7 number about 3 ~ 5, the diameter of row sand hole 7 is 0.1 ~ 0.3 times of sand removal device barrel 3 diameter, guarantees that the granule sand has sufficient chance to get into sand storage chamber 10.
The cylindrical cylinder 5 is of a cylindrical structure with two closed ends, the outer wall of the cylindrical cylinder 5 is fixed on the inner side of the helical blade 4, the diameter of the cylindrical cylinder 5 is usually 0.5-0.8 times of the diameter of the barrel 3 of the desanding device, and the cylindrical length of the cylindrical cylinder 5 is usually 1-5 times of the diameter of the barrel 3 of the desanding device.
The sand storage chamber 10 is of a horizontal cylinder structure with circular end sockets at two ends, a sand inlet 9 corresponding to the sand discharge port 7 is usually arranged right above the sand storage chamber, the sand discharge port 7 and the sand inlet 9 are connected through a full-bore ball valve 8, the full-bore ball valve 8 does not form a throttling effect on a flow passage and does not block the movement of separated solid impurities to the sand storage chamber 10, and the volume of the sand storage chamber is required to guarantee the maintenance period of 3-6 months.
The rotation stopping fan plates 6 are of rectangular structures, long edges of the rotation stopping fan plates are welded on the inner wall of the barrel 3 of the sand removing device, short edges of the rotation stopping fan plates are centripetal to the center of the barrel 3 of the sand removing device, and the rotation stopping fan plates 6 are evenly arranged at equal circumferential angles. The length of the long edge of the rotation stopping fan plate 6 is 1-2 times of the inner diameter of the barrel 3 of the sand removing device, the width of the long edge of the rotation stopping fan plate is 0.2-0.5 times of the inner diameter of the barrel 3 of the sand removing device, and the number of the fan plates of the rotation stopping fan plate 6 is usually 4-8 so as to effectively stop the tangential speed of a flow field.
The material of each component of the present invention is typically stainless steel (e.g., 304 stainless steel) and the connections between the components are typically welded.
The simple working process of the invention is as follows: the method comprises the steps that firstly, crude oil or natural gas medium containing solid impurities enters a barrel 3 of a desanding device through an inlet 1 of the desanding device, then, the crude oil or natural gas medium moves spirally in a spiral flow channel formed by spiral blades 4 between a cylindrical barrel 5 and the barrel 3 of the desanding device, the solid impurities move towards the inner wall surface of the barrel 3 of the desanding device under the action of centrifugal force, the solid impurities moving to the inner wall surface of the barrel 3 of the desanding device flow out of the barrel 3 of the desanding device through a sand discharging opening 7, then, the solid impurities enter a sand storage chamber 10 through a full-diameter ball valve 8 for storage, and oil gas which does not contain the solid impurities after spiral desanding flows to the downstream of the desanding. When the clearance of carrying out solid impurity, close the full latus rectum ball valve 8 of UNICOM sand removal device barrel 3 and sand storage chamber 10 and take off sand storage chamber 10, through the inversion sand inlet 9 clear away the solid impurity in the sand storage chamber 10 after, with the sand storage chamber 10 install fixed the back again and open full latus rectum ball valve 8.
Claims (8)
- The on-line desanding device for the non-stop conveying of the oil and gas pipelines comprises a desanding device inlet (1), a desanding device outlet (2) and a sand storage chamber (10), and is characterized by further comprising a desanding device cylinder (3), a cylindrical cylinder (5), spiral blades (4), a rotation stopping fan plate (6), a sand inlet (9), a sand discharge port (7) and a full-diameter ball valve (8), wherein the desanding device cylinder (3) is of a cylinder structure with flange joints at two ends, the two flange joints are the desanding device inlet (1) and the desanding device outlet (2) respectively, the cylindrical cylinder (5) is located inside the desanding device cylinder (3) and coaxially mounted with the desanding device cylinder (3), the spiral blades (4) are located between the desanding device cylinder (3) and the cylindrical cylinder (5) to form a spiral flow channel, the rotation stopping fan plate (6) is located inside the desanding device cylinder (3), mounted between the cylindrical cylinder (5) and the desanding device outlet (2), the circular space between the desanding device cylinder (3) and the cylindrical cylinder (5) is uniformly arranged below the sand discharge port (7) of the sand removal device cylinder (3), and the full-diameter ball valve (8) are sequentially arranged below the sand storage chamber (7).
- 2. The online desanding device without stopping transportation of oil and gas pipelines according to claim 1, wherein the helical blade (4) is a structure formed by rotating a flat plate in a helical manner, the outer side of the helical blade (4) is arranged on the inner wall of the barrel body (3) of the desanding device, the inner side of the helical blade is arranged on the outer wall of the cylindrical barrel (5), and the helical inclination angle of the helical blade (4) is between 5 and 15 degrees.
- 3. The online sand removing device without stopping transportation of oil and gas pipelines according to claim 1, wherein the sand discharge ports (7) are arranged rows below the sand removing device cylinder body (3) and are arranged at the bottom of the spiral flow channel at equal intervals, and the number of the sand discharge ports (7) is 3-5.
- 4. The online sand removing device without stopping transportation according to claim 1 or 3, wherein the diameter of the sand discharge port (7) is 0.1-0.3 times of the diameter of the sand removing device cylinder (3).
- 5. The online desanding device without stopping transportation of oil and gas pipelines according to claim 1, wherein the cylindrical cylinder (5) is of a cylinder structure with two closed ends, the outer wall of the cylindrical cylinder (5) is fixed on the inner side of the helical blade (4), the diameter of the cylindrical cylinder (5) is 0.5-0.8 times of the diameter of the desanding device cylinder (3), and the cylindrical length of the cylindrical cylinder (5) is 1-5 times of the diameter of the desanding device cylinder (3).
- 6. The online sand removing device without stopping transportation for oil and gas pipelines according to claim 1, wherein the sand storage chamber (10) is a horizontal cylinder structure with circular end sockets at both ends, a sand inlet (9) corresponding to the sand discharge port (7) is usually installed right above the sand storage chamber, and the sand discharge port (7) and the sand inlet (9) are connected through a full-bore ball valve (8).
- 7. The online sand removing device without stopping transportation of oil and gas pipelines according to claim 1, wherein the stop-rotation fan plates (6) are rectangular in structure, long sides are welded on the inner wall of the sand removing device cylinder (3), short sides are centripetally directed to the center of the sand removing device cylinder (3), and a plurality of stop-rotation fan plates (6) are uniformly arranged at equal circumferential angles.
- 8. The online sand removing device without stopping transportation of oil and gas pipelines according to claim 1 or 7, wherein the length of the long side of the rotation stopping fan plate (6) is 1-2 times of the inner diameter of the sand removing device cylinder (3), the width of the long side of the rotation stopping fan plate is 0.2-0.5 times of the inner diameter of the sand removing device cylinder (3), and the number of the rotation stopping fan plate (6) is 4-8.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810795034.2A CN110735625A (en) | 2018-07-19 | 2018-07-19 | online desanding device for oil and gas pipeline without stopping transmission |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810795034.2A CN110735625A (en) | 2018-07-19 | 2018-07-19 | online desanding device for oil and gas pipeline without stopping transmission |
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| CN110735625A true CN110735625A (en) | 2020-01-31 |
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| CN201810795034.2A Pending CN110735625A (en) | 2018-07-19 | 2018-07-19 | online desanding device for oil and gas pipeline without stopping transmission |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114737932A (en) * | 2022-04-16 | 2022-07-12 | 江苏苏盐阀门机械有限公司 | Natural gas well head gas production device |
| CN115370345A (en) * | 2022-10-25 | 2022-11-22 | 四川凌耘建科技有限公司 | Automatic shale gas sand discharging device and method |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114737932A (en) * | 2022-04-16 | 2022-07-12 | 江苏苏盐阀门机械有限公司 | Natural gas well head gas production device |
| CN115370345A (en) * | 2022-10-25 | 2022-11-22 | 四川凌耘建科技有限公司 | Automatic shale gas sand discharging device and method |
| CN115370345B (en) * | 2022-10-25 | 2023-01-10 | 四川凌耘建科技有限公司 | Automatic shale gas sand discharging device and method |
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Application publication date: 20200131 |