CN111287679A - Underground sand removing equipment for coal bed gas exploitation - Google Patents
Underground sand removing equipment for coal bed gas exploitation Download PDFInfo
- Publication number
- CN111287679A CN111287679A CN202010269502.XA CN202010269502A CN111287679A CN 111287679 A CN111287679 A CN 111287679A CN 202010269502 A CN202010269502 A CN 202010269502A CN 111287679 A CN111287679 A CN 111287679A
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- sand
- cleaning
- liquid
- pipe
- seat
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- 239000004576 sand Substances 0.000 title claims abstract description 145
- 239000003245 coal Substances 0.000 title claims abstract description 25
- 239000007788 liquid Substances 0.000 claims abstract description 162
- 238000004140 cleaning Methods 0.000 claims abstract description 152
- 238000011084 recovery Methods 0.000 claims abstract description 26
- 230000002093 peripheral effect Effects 0.000 claims abstract description 18
- 239000007921 spray Substances 0.000 claims abstract description 18
- 238000003756 stirring Methods 0.000 claims abstract description 7
- 238000005507 spraying Methods 0.000 claims description 39
- 230000000694 effects Effects 0.000 abstract description 9
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 10
- 238000004891 communication Methods 0.000 description 6
- 238000005213 imbibition Methods 0.000 description 2
- 238000009825 accumulation Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
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Classifications
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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
- E21B21/00—Methods or apparatus for flushing boreholes, e.g. by use of exhaust air from motor
-
- 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
- E21B21/00—Methods or apparatus for flushing boreholes, e.g. by use of exhaust air from motor
- E21B21/14—Methods or apparatus for flushing boreholes, e.g. by use of exhaust air from motor using liquids and gases, e.g. foams
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- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Geology (AREA)
- Mining & Mineral Resources (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Cleaning By Liquid Or Steam (AREA)
Abstract
The invention discloses an underground sand cleaning device for coal bed gas exploitation, wherein a sand cleaning head mechanism is arranged in such a way that a cleaning liquid medium can be sprayed from a cleaning liquid outlet pipe in an inclined manner from the lower sides of the four circumferential sides of the sand cleaning head mechanism when the sand cleaning head mechanism is used for cleaning the sand underground, a cleaning liquid recovery pipe can enable the underground cleaning liquid medium to be sucked from the center of the sand cleaning head inwards so as to realize the circular sucking and cleaning of the sand underground, a gas inlet joint is also arranged on the cleaning liquid outlet pipe, high-pressure air can be added into the cleaning liquid outlet pipe through an air pump, the pressure of the cleaning liquid medium in the cleaning liquid outlet pipe is improved, further, the sand grains in the sand underground are stirred, the sand cleaning capability and efficiency are effectively improved, and the sand cleaning effect is improved, a main liquid spray hole, an auxiliary liquid spray seat and an auxiliary liquid spray nozzle are arranged at the bottom end of a peripheral liquid outlet seat, an inclined auxiliary liquid spray nozzle is arranged at the lower end of the, the main liquid spray hole is matched with the auxiliary liquid spray nozzle, so that the stirring effect of sand grains can be effectively ensured.
Description
Technical Field
The invention particularly relates to underground sand removing equipment for exploitation of coal bed methane, and belongs to the field of sand removing equipment.
Background
In the coal bed gas exploitation, a exploitation well is generally drilled and arranged, then an exploitation pipe is arranged underground for exploitation, but with the exploitation going on, some sand grains are easily accumulated underground, and the accumulation of the sand grains can cause the gaps in the coal bed gas to be blocked, thereby causing the exploitation of the coal bed gas to be blocked, and affecting the further exploitation, therefore, the coal bed gas exploitation well needs to be cleaned, the existing sand cleaning equipment generally utilizes a suction pump and a suction pipe for suction, but when suction is performed, on one hand, large-grain sand grains are difficult to be effectively cleaned, and when suction is performed, blades of the suction pump are greatly damaged, meanwhile, when suction is performed, because the sand grains fly around the underground, effective complete cleaning is difficult to be performed, and because of the effect of gravel, the common cleaning mode of circulating cleaning liquid is adopted, resulting in thorough and poor cleaning and affecting cleaning efficiency and reliability.
Disclosure of Invention
The invention aims to provide underground sand removing equipment for exploiting coal bed methane, so as to solve the problems in the background technology.
In order to achieve the purpose, the invention provides the following technical scheme:
the coal bed gas is opened and is adopted sand removal equipment in pit, and it includes support frame, collection sand jar, circulation storage tank, clean drain pipe, cleaning solution recovery pipe, sand removal main shaft and sand removal head mechanism, one side of support frame is fixed and is provided with a supporting bench, be provided with circulation pump package on the supporting bench, the circulation storage tank is fixed on the support frame, the bottom of support frame be provided with the play sand conical bin intercommunication of circulation storage tank bottom the collection sand jar, its characterized in that, upper portion one side of circulation storage tank is passed through clean drain pipe is connected to sand removal head mechanism, sand removal head mechanism still through cleaning solution recovery pipe circulation connection to the opposite side lower part of circulation storage tank, the upper end fixed connection of sand removal head mechanism is in the bottom of sand removal main shaft, the center of sand removal main shaft is provided with the center and holds the chamber, clean drain pipe, sand removal, Cleaning solution recovery tube all passes the center hold the chamber with sand removal head mechanism connects, wherein, sand removal head mechanism constructs to establish to it when sand removal in the pit, clean drain pipe can make the cleaning solution medium follow sand removal head mechanism all around to the mode of side below slope spray cleaning solution medium, just cleaning solution recovery tube can make the cleaning solution medium in the pit inwards inhale cleaning solution medium from the center of sand removal head to the realization inhales the clearance to the circulation of sand in the pit.
Further, preferably, when the cleaning liquid medium is ejected in such a manner that the cleaning liquid medium is inclined downward from the periphery of the sand cleaning head mechanism, the cleaning liquid medium is swirled and stirred around a certain direction in the well.
Further, as preferred, still be connected between clean drain pipe and the circulation storage tank and be provided with communicating pipe, the feed liquor pump of circulation pump package with communicating pipe intercommunication, the drain pump of circulation pump package with cleaning solution recovery pipe intercommunication, be located on the clean drain pipe the play liquid end of the feed liquor pump of circulation pump package still is provided with first check valve.
Preferably, a gas inlet joint is further arranged on the cleaning liquid outlet pipe between the first one-way valve and the sand cleaning head mechanism, and the gas inlet joint is connected with a gas pump so as to add high-pressure air into the cleaning liquid outlet pipe through the gas pump and increase the pressure of a cleaning liquid medium in the cleaning liquid outlet pipe, thereby stirring the sand grains in the well.
Further, as preferred, be provided with the second check valve on the cleaning solution recovery pipe, the sand removal head mechanism be provided with a plurality of play liquid branch pipes all around, each play liquid branch pipe parallelly connected extremely clean drain pipe, the center connection of sand removal head mechanism is provided with the pipette, the pipette with cleaning solution recovery pipe intercommunication.
Further, as preferred, the sand removal head mechanism includes that center imbibition head, periphery go out the liquid seat, wherein, the symmetry is gone out to be provided with two at least peripheries of center imbibition head and goes out the liquid seat, every the bottom that the periphery goes out the liquid seat all is provided with the cleaning brush group, the bottom that the periphery goes out the liquid seat still is provided with hydrojet subassembly, each hydrojet subassembly all with go out liquid branch pipe intercommunication, just hydrojet subassembly constructs to the mode of slope to the side below and sprays cleaning solution medium.
Further, as a preferable mode, a suction head is arranged at the bottom end of the central liquid suction head, a plurality of suction holes are formed in the suction head, the diameter of each suction hole is larger than that of each sand grain, a communication seat is arranged at the upper end of the central liquid suction head, a first suction branch pipe and a second suction branch pipe are respectively arranged on the communication seat and located on two sides of the communication seat, and the first suction pipe and the second suction pipe are communicated to the cleaning liquid recovery pipe.
Further, it is preferred that a swirl vane is provided in the central suction head, the swirl vane being configured such that sand grains are screwed up into the central suction head together with the cleaning liquid medium.
Further, as a preferable mode, a main liquid spraying hole, an auxiliary liquid spraying seat and an auxiliary liquid spraying nozzle are arranged at the bottom end of the peripheral liquid outlet seat, wherein the inclined main liquid spraying hole is arranged at the lower end of the peripheral liquid outlet seat, the main liquid spraying hole is arranged obliquely to the lateral lower side, the auxiliary liquid spraying seat is arranged at one side, located at the orifice of the main liquid spraying hole, of the bottom of the peripheral liquid outlet seat, a guide arc-shaped groove is formed in one side, facing the orifice, of the auxiliary liquid spraying seat, and the auxiliary liquid spraying nozzle is arranged at the lower end of the auxiliary liquid spraying seat in an inclined mode.
Further, as the preferred, still include flexible mechanism of sending into, flexible mechanism of sending into is connected the sand removal main shaft upper end, flexible mechanism of sending into can make the sand removal main shaft stretches into in the pit, just flexible mechanism of sending into can make the sand removal main shaft rotates around its axis.
Compared with the prior art, the invention has the beneficial effects that:
the coal bed gas is driven by the underground sand cleaning equipment, the sand cleaning head mechanism is arranged in such a way that the cleaning liquid medium can be sprayed in a manner that the cleaning liquid medium inclines from the periphery of the sand cleaning head mechanism to the lower side when the underground sand is cleaned, and the cleaning liquid recovery pipe can enable the underground cleaning liquid medium to suck the cleaning liquid medium from the center of the sand cleaning head inwards so as to realize the circular suction cleaning of the underground sand and effectively ensure the sand cleaning effect, meanwhile, the cleaning liquid pipe is also provided with the gas inlet joint which is connected with the air pump, so that high-pressure air can be effectively added into the cleaning liquid pipe through the air pump, the pressure of the cleaning liquid medium in the cleaning liquid pipe is improved, further, the underground sand grains are stirred, the sand cleaning capacity and efficiency are effectively improved, and the sand cleaning effect is improved, the bottom end of the peripheral liquid outlet seat is provided with a main liquid spraying hole, an auxiliary liquid spraying seat and an auxiliary liquid spraying nozzle, one side of the auxiliary liquid spraying seat facing the hole opening is provided with a guide arc-shaped groove, the lower end of the auxiliary liquid spraying seat is provided with the auxiliary liquid spraying nozzle which is obliquely arranged, and the main liquid spraying hole is matched with the auxiliary liquid spraying nozzle, so that the stirring effect on sand grains can be effectively ensured.
Drawings
FIG. 1 is a schematic view of the overall structure of an underground sand removing device for exploiting coal bed methane;
FIG. 2 is a schematic structural view of a sand cleaning head mechanism in an underground sand cleaning device for coal bed methane exploitation.
FIG. 3 is a schematic structural view of a portion (only one peripheral liquid outlet seat is shown) of the sand cleaning head mechanism of the present invention;
Detailed Description
Referring to fig. 1 to 3, in the embodiment of the present invention, an underground sand cleaning device is used for coal bed methane exploitation, and the underground sand cleaning device includes a support frame 1, a sand collection tank 4, a circulation storage tank 2, a cleaning liquid outlet pipe 12, a cleaning liquid recovery pipe 6, a sand cleaning spindle 11, and a sand cleaning head mechanism 14, wherein a support table 18 is fixedly disposed on one side of the support frame, a circulation pump unit 17 is disposed on the support table, the circulation storage tank is fixed on the support frame, the bottom of the support frame is provided with the sand collection tank 4 communicated with a sand outlet conical bin 3 at the bottom of the circulation storage tank, and the underground sand cleaning device is characterized in that one side of the upper portion of the circulation storage tank 2 is connected to the sand cleaning head mechanism 14 through the cleaning liquid outlet pipe 12, the sand cleaning head mechanism 14 is also circularly connected to the lower portion of the other side of the circulation storage tank 2 through the cleaning liquid recovery pipe 6, the center of sand removal main shaft 11 is provided with the center and holds chamber 10, clean drain pipe 12, cleaning solution recovery pipe 6 all pass the center hold chamber 10 with sand removal head mechanism 14 is connected, wherein, sand removal head mechanism 14 constructs to establish to it when sand removal to the pit, clean drain pipe 12 can make cleaning solution medium follow the mode of sand removal head mechanism 14's four circumference side below slopes sprays cleaning solution medium, just cleaning solution recovery pipe 6 can make the cleaning solution medium in the pit inwards inhale cleaning solution medium from the center of sand removal head to the realization inhales the clearance to the circulation of sand in the pit.
In the present embodiment, when the cleaning liquid medium is ejected in such a manner that the cleaning liquid medium is inclined from below the four circumferential sides of the sand cleaning head mechanism 14, the cleaning liquid medium can be swirled and agitated around a certain direction in the well.
As a preferred embodiment, a communicating pipe 7 is further connected between the cleaning liquid outlet pipe 12 and the circulating storage tank 2, a liquid inlet pump of the circulating pump group 17 is communicated with the communicating pipe (not shown in the figure), a liquid outlet pump of the circulating pump group is communicated with the cleaning liquid recovery pipe 6, and a first one-way valve 16 is further disposed on the cleaning liquid outlet pipe 12 at a liquid outlet end of the liquid inlet pump of the circulating pump group 17.
The cleaning liquid outlet pipe 12 between the first one-way valve and the sand cleaning head mechanism 14 is further provided with a gas inlet joint 9, and the gas inlet joint 9 is connected with a gas pump so as to add high-pressure air into the cleaning liquid outlet pipe 12 through the gas pump and increase the pressure of a cleaning liquid medium in the cleaning liquid outlet pipe 12, thereby stirring the sand grains in the well.
Be provided with second check valve 8 on the cleaning solution recovery tube 6, sand removal head mechanism 14 is provided with a plurality of play liquid branch pipes 15 all around, each play liquid branch pipe parallelly connected extremely clean drain pipe 12, sand removal head mechanism 14's center connection is provided with pipette 13, the pipette with cleaning solution recovery tube 6 intercommunication.
The sand cleaning head mechanism 14 comprises a central liquid suction head 20 and a peripheral liquid outlet seat 21, wherein the periphery of the central liquid suction head 20 is symmetrically provided with at least two peripheral liquid outlet seats 21, each of which is provided with a cleaning brush group 23 at the bottom of the peripheral liquid outlet seat 21, the bottom of the peripheral liquid outlet seat is also provided with a liquid spray head component 22, each of which is communicated with the liquid outlet branch pipe 15, and the liquid spray head component 22 is arranged to spray cleaning liquid medium in a manner of inclining towards the lower side.
A suction head 19 is arranged at the bottom end of the central liquid suction head 20, a plurality of suction holes are formed in the suction head, the diameter of each suction hole is larger than that of each sand grain, a communication seat 25 is arranged at the upper end of the central liquid suction head 20, a first suction branch pipe 24 and a second suction branch pipe 26 are respectively arranged on the communication seat and located on two sides of the communication seat, and the first suction pipe and the second suction pipe are communicated to the cleaning liquid recovery pipe 6.
Swirl vanes are provided in the central suction head 20, which swirl vanes are configured such that sand grains are screwed up into the central suction head 20 together with the cleaning liquid medium.
The bottom end of the peripheral liquid outlet seat 21 is provided with a main liquid spraying hole 27, an auxiliary liquid spraying seat 28 and an auxiliary liquid spraying nozzle 29, wherein the lower end of the peripheral liquid outlet seat 21 is provided with an inclined main liquid spraying hole 27, the main liquid spraying hole is obliquely arranged towards the lower side, the auxiliary liquid spraying seat 28 is arranged on one side, located at the orifice of the main liquid spraying hole 27, of the bottom of the peripheral liquid outlet seat 21, the auxiliary liquid spraying seat 28 is arranged on one side, facing the orifice, of the auxiliary liquid spraying seat 28, and the auxiliary liquid spraying nozzle 29 is obliquely arranged at the lower end of the auxiliary liquid spraying seat 28.
The sand cleaning device also comprises a telescopic feeding mechanism, wherein the telescopic feeding mechanism is connected to the upper end of the sand cleaning main shaft 11, the telescopic feeding mechanism can enable the sand cleaning main shaft to extend into the underground, and the telescopic feeding mechanism can enable the sand cleaning main shaft to rotate around the axis of the sand cleaning main shaft.
The coal bed gas is driven by the underground sand cleaning equipment, the sand cleaning head mechanism is arranged in such a way that the cleaning liquid medium can be sprayed in a manner that the cleaning liquid medium inclines from the periphery of the sand cleaning head mechanism to the lower side when the underground sand is cleaned, and the cleaning liquid recovery pipe can enable the underground cleaning liquid medium to suck the cleaning liquid medium from the center of the sand cleaning head inwards so as to realize the circular suction cleaning of the underground sand and effectively ensure the sand cleaning effect, meanwhile, the cleaning liquid pipe is also provided with the gas inlet joint which is connected with the air pump, so that high-pressure air can be effectively added into the cleaning liquid pipe through the air pump, the pressure of the cleaning liquid medium in the cleaning liquid pipe is improved, further, the underground sand grains are stirred, the sand cleaning capacity and efficiency are effectively improved, and the sand cleaning effect is improved, the bottom end of the peripheral liquid outlet seat is provided with a main liquid spraying hole, an auxiliary liquid spraying seat and an auxiliary liquid spraying nozzle, one side of the auxiliary liquid spraying seat facing the hole opening is provided with a guide arc-shaped groove, the lower end of the auxiliary liquid spraying seat is provided with the auxiliary liquid spraying nozzle which is obliquely arranged, and the main liquid spraying hole is matched with the auxiliary liquid spraying nozzle, so that the stirring effect on sand grains can be effectively ensured.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention are equivalent to or changed within the technical scope of the present invention.
Claims (10)
1. The underground sand removing equipment for coal bed gas exploitation comprises a support frame (1), a sand collecting tank (4), a circulating storage tank (2), a cleaning liquid outlet pipe (12), a cleaning liquid recovery pipe (6), a sand removing main shaft (11) and a sand removing head mechanism (14), wherein a support table (18) is fixedly arranged on one side of the support frame, a circulating pump set (17) is arranged on the support table, the circulating storage tank is fixed on the support frame, the bottom of the support frame is provided with the sand collecting tank (4) communicated with a sand outlet conical bin (3) at the bottom of the circulating storage tank, the underground sand removing equipment is characterized in that one side of the upper part of the circulating storage tank (2) is connected to the sand removing head mechanism (14) through the cleaning liquid outlet pipe (12), and the sand removing head mechanism (14) is also connected to the lower part of the other side of the circulating storage tank (2) in a circulating manner, the upper end fixed connection of sand removal head mechanism (14) is in the bottom of sand removal main shaft (11), the center of sand removal main shaft (11) is provided with the center and holds chamber (10), clean drain pipe (12), cleaning solution recovery tube (6) all pass the center hold chamber (10) with sand removal head mechanism (14) are connected, wherein, sand removal head mechanism (14) construct to establish to its when sand removal in the pit, clean drain pipe (12) can make cleaning solution medium follow the mode of slope to the side below all around of sand removal head mechanism (14) sprays cleaning solution medium, just cleaning solution recovery tube (6) can make cleaning solution medium in the pit inwards inhale cleaning solution medium from the center of sand removal head to the circulation of realizing sand in the pit inhales the clearance.
2. The coal seam gas exploitation downhole sand removal apparatus of claim 1, wherein: when the cleaning liquid medium is sprayed from the periphery of the sand cleaning head mechanism (14) to the lower side in an inclined mode, the cleaning liquid medium can be enabled to swirl and stir around a certain direction underground.
3. The coal seam gas exploitation downhole sand removal apparatus of claim 1, wherein: clean drain pipe (12) with still connect between circulation storage tank (2) and be provided with communicating pipe (7), the feed liquor pump of circulation pump package (17) with communicating pipe intercommunication, the drain pump of circulation pump package with cleaning solution recovery tube (6) intercommunication, it is located on clean drain pipe (12) the play liquid end of the feed liquor pump of circulation pump package (17) still is provided with first check valve (16).
4. The coal seam gas exploitation downhole sand removal apparatus of claim 3, wherein: and a gas inlet joint (9) is further arranged on the cleaning liquid outlet pipe (12) between the first one-way valve and the sand cleaning head mechanism (14), and the gas inlet joint (9) is connected with a gas pump so as to add high-pressure air into the cleaning liquid outlet pipe (12) through the gas pump and improve the pressure of a cleaning liquid medium in the cleaning liquid outlet pipe (12), thereby stirring the sand grains in the well.
5. The coal seam gas exploitation downhole sand removal device of claim 4, wherein: be provided with second check valve (8) on cleaning solution recovery tube (6), be provided with a plurality of play liquid branch pipes (15), each around sand cleaning head mechanism (14) play liquid branch pipe parallelly connected extremely clean drain pipe (12), the center connection of sand cleaning head mechanism (14) is provided with pipette (13), the pipette with cleaning solution recovery tube (6) intercommunication.
6. The coal seam gas exploitation downhole sand removal device of claim 5, wherein: the sand cleaning head mechanism (14) comprises a central liquid suction head (20) and a peripheral liquid outlet seat (21), wherein the periphery of the central liquid suction head (20) is symmetrically provided with at least two peripheral liquid outlet seats (21) and each peripheral liquid outlet seat (21) is provided with a cleaning brush group (23), the bottom of the peripheral liquid outlet seat is also provided with a liquid spraying head assembly (22) which is communicated with a liquid outlet branch pipe (15), and the liquid spraying head assembly (22) is arranged to spray cleaning liquid medium in a manner of inclining towards the lower side.
7. The coal seam gas exploitation downhole sand removal device of claim 6, wherein: the bottom end of the central liquid suction head (20) is provided with a suction head (19), the suction head is provided with a plurality of suction holes, the diameter of each suction hole is larger than that of sand grains, the upper end of the central liquid suction head (20) is provided with a communicating seat (25), a first suction branch pipe (24) and a second suction branch pipe (26) are respectively arranged on two sides of the communicating seat, and the first suction pipe and the second suction pipe are communicated to the cleaning liquid recovery pipe (6).
8. The coal seam gas exploitation downhole sand removal device of claim 6, wherein: swirl vanes are arranged in the central suction head (20), which swirl vanes are designed such that sand grains are screwed up together with the cleaning liquid medium into the central suction head (20).
9. The coal seam gas exploitation downhole sand removal device of claim 6, wherein: the bottom of periphery play liquid seat (21) is provided with main spray hole (27), vice hydrojet seat (28) and vice hydrojet (29), wherein, the lower extreme of periphery play liquid seat (21) is provided with main spray hole (27) of slope, main spray hole is to the side below slope setting, just the bottom of periphery play liquid seat (21) is located one side in the drill way of main spray hole (27) is provided with vice hydrojet seat (28), vice hydrojet seat (28) orientation one side in drill way is provided with direction arc wall (28), the lower extreme of vice hydrojet seat (28) is provided with vice hydrojet (29) that the slope set up.
10. The coal seam gas exploitation downhole sand removal device of claim 6, wherein: still send into the mechanism including flexible, flexible send into the mechanism and connect in sand removal main shaft (11) upper end, flexible send into the mechanism and can make the sand removal main shaft stretches into in the pit, just flexible send into the mechanism and can make the sand removal main shaft rotates around its axis is rotatory.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010269502.XA CN111287679B (en) | 2020-04-08 | 2020-04-08 | Underground sand removing equipment for coal bed gas exploitation |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010269502.XA CN111287679B (en) | 2020-04-08 | 2020-04-08 | Underground sand removing equipment for coal bed gas exploitation |
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| CN111287679A true CN111287679A (en) | 2020-06-16 |
| CN111287679B CN111287679B (en) | 2022-08-30 |
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