CN216477133U - Drilling, protecting and measuring integrated device in drilling construction of soft coal seam - Google Patents
Drilling, protecting and measuring integrated device in drilling construction of soft coal seam Download PDFInfo
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- CN216477133U CN216477133U CN202122524059.9U CN202122524059U CN216477133U CN 216477133 U CN216477133 U CN 216477133U CN 202122524059 U CN202122524059 U CN 202122524059U CN 216477133 U CN216477133 U CN 216477133U
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- 238000005553 drilling Methods 0.000 title claims abstract description 122
- 238000010276 construction Methods 0.000 title claims abstract description 35
- 239000003245 coal Substances 0.000 title claims abstract description 28
- 238000005259 measurement Methods 0.000 claims abstract description 17
- 239000000523 sample Substances 0.000 claims description 13
- 238000012360 testing method Methods 0.000 claims description 8
- 230000005484 gravity Effects 0.000 claims description 6
- 230000000149 penetrating effect Effects 0.000 claims description 3
- 238000000605 extraction Methods 0.000 abstract description 17
- 230000007547 defect Effects 0.000 abstract description 4
- 238000000034 method Methods 0.000 description 7
- 230000000694 effects Effects 0.000 description 3
- 229920000915 polyvinyl chloride Polymers 0.000 description 3
- 239000004800 polyvinyl chloride Substances 0.000 description 3
- 229920000049 Carbon (fiber) Polymers 0.000 description 2
- 239000004917 carbon fiber Substances 0.000 description 2
- 210000002421 cell wall Anatomy 0.000 description 2
- 238000013507 mapping Methods 0.000 description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 210000000664 rectum Anatomy 0.000 description 2
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 1
- 101100293261 Mus musculus Naa15 gene Proteins 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 229910001416 lithium ion Inorganic materials 0.000 description 1
- 238000005070 sampling Methods 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 239000002893 slag Substances 0.000 description 1
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Abstract
The utility model discloses a drilling, protecting and measuring integrated device in the drilling construction of a soft coal seam, which comprises a large-drift-diameter triangular drill rod, an openable drill bit arranged at the front end of the large-drift-diameter triangular drill rod, a sieve tube, a hanger arranged at the front end of the sieve tube and a drilling track instrument, wherein the openable drill bit is arranged at the front end of the large-drift-diameter triangular drill rod; after the openable drill bit and the large-drift-diameter three-edged drill rod are drilled in place, the hanger and the sieve tube can extend to the center drill bit head of the openable drill bit along the center through hole of the large-drift-diameter three-edged drill rod so that the hanger extends out of the openable drill bit and is fixed at the bottom of the hole through the opened fixing wings, and the drilling track instrument can be sent into the drill hole from the center hole of the sieve tube to perform drilling track measurement so as to complete drilling hole protection and measurement integrated operation. The utility model realizes the consistency and maximization of the drilling depth, the sieve tube depth and the track measuring depth, and effectively breaks the defects and bottlenecks of the existing soft coal seam gas extraction drilling construction.
Description
Technical Field
The utility model belongs to the soft coal seam drilling technology, and particularly relates to a drilling hole protection measurement integrated device suitable for gas extraction drilling construction of a soft coal seam.
Background
The coal mine anti-breakthrough code (2019 edition) states that pre-gas extraction boreholes with depths exceeding 120m should measure at least 2 trajectories of every 10 boreholes, and boreholes with depths of 60m-120m should measure at least 1 trajectory of every 10 boreholes. At present, two common gas extraction drilling construction methods exist. Firstly, drilling construction is carried out to a target depth, then the drill is lifted, then a drill push type track instrument is adopted for drilling measurement, the track instrument is measured, and then a sieve tube is put in for hole protection and subsequent gas extraction operation; the other method is that the track measurement is carried out while drilling construction is carried out by adopting a track-while-drilling instrument, the drilling is carried out after the target depth is reached, and then a sieve tube is put in for hole protection and subsequent gas extraction operation. In the construction of gas extraction drilling of the soft coal seam, the two methods have great defects, when a drilling machine lifts a drill, the soft coal seam is easy to have hole collapse, hole shrinkage and other hole accidents, and the accident position cannot be controlled, so that the push type inclinometer or the sieve tube of the drilling machine cannot be conveyed to the bottom of the hole, the actual effective drilling track and the hole protecting section of the sieve tube are far smaller than the drilling depth, and the construction of gas extraction drilling cannot reach the standard. Big through-hole switching formula all-round drill bit that creeps into (CN202325241U utility model patent) proposes (1) adopts big through-hole switching formula all-round to creep into drill bit drilling (2) screen pipe and reachs hole bottom (3) through the hole of drilling rod and drill bit and keep the screen pipe position motionless, withdraws from big through-hole switching formula all-round drill bit and supporting drilling rod of creeping into, this patent only can realize drilling and protect hole simultaneous operation, can't realize drilling hole protection and survey hole integration operation.
SUMMERY OF THE UTILITY MODEL
The utility model aims to provide a drilling, protecting and measuring integrated device in soft coal seam drilling construction, which solves the problems of incomplete or failed hole protection and measuring operation caused by hole collapse, hole shrinkage and other hole accidents, realizes the consistency and maximization of drilling depth, sieve tube depth and track measuring depth, effectively solves the defects and bottlenecks of the existing gas extraction drilling construction method, and provides a new construction method and a new device for ensuring the gas extraction target and effect of a soft coal seam.
In order to achieve the purpose, the utility model adopts the following technical scheme:
the drilling, protecting and measuring integrated device in the drilling construction of the soft coal seam comprises a large-drift-diameter triangular drill rod, an openable drill bit arranged at the front end of the large-drift-diameter triangular drill rod, a sieve tube, a hanger arranged at the front end of the sieve tube and a drilling track instrument;
the openable drill comprises a drill body with a central through hole, an outer drill bit is arranged at the edge of the front end of the drill body, an openable central drill bit is arranged at the end face of the front end of the drill body, and the central drill bit can be opened to enable the central through hole of the drill body to be communicated when axial force is applied to the central drill bit from the inside of the central through hole of the drill body; the hanger comprises a tubular body, wherein two fixed wings which can be opened towards two sides of the tubular body are arranged in the tubular body;
the inner diameters of the drill bit and the large-drift-diameter triangular drill rod are larger than the outer diameters of the hanger and the sieve tube, and the inner diameter of the sieve tube is larger than the outer diameter of the drilling track instrument; after the drill bit and the large-drift-diameter triangular drill rod are drilled in place, the hanger and the sieve tube can extend to the tool bit of the center drill bit along the center through hole of the large-drift-diameter triangular drill rod so that the hanger can extend out of the openable and closable drill bit and be fixed at the bottom of the hole through the opened fixing wings, and the drilling track instrument can be sent into the drill hole from the center hole of the sieve tube to measure the drilling track.
The utility model also comprises the following technical characteristics:
optionally, the drill body front end is round platform form, and outer drill bit tool bit has a plurality ofly, and a plurality ofly outer drill bit tool bits are along drill body front end edge circumference equipartition.
Optionally, the drill bit body front end terminal surface is equipped with the mounting groove, the center drill bit tool bit is located this mounting groove, and center drill bit tool bit one end is articulated with the drill bit body front end terminal surface, and the center drill bit tool bit other end is equipped with anticreep groove and this anticreep groove and the protruding cooperation of anticreep on the mounting groove cell wall, and when the center drill bit tool bit was closed, the center drill bit tool bit was located the mounting groove and anticreep groove and the protruding cooperation of anticreep were with the spacing closure of center drill bit tool bit.
Optionally, the central drill bit is closed opposite the central through bore of the drill body.
Optionally, the large-drift-diameter triangular drill rod is a triangular spiral drill rod with an outer diameter of phi 73mm and an inner diameter of phi 36 mm.
Optionally, the front ends of the two fixed wings of the hanger are mounted in the tubular body through the same pin shaft, and the two fixed wings can rotate along the pin shaft until the two fixed wings open towards the two sides of the tubular body; the tubular body is provided with a through hole penetrating through the two sides so as to realize that the two fixed wings can be opened from the inside of the tubular body to the two sides.
Optionally, the two fixed wings are hinged to a stay bar, and the rear ends of the two stay bars are connected to a spring tensioning mechanism in the tubular body, and the spring tensioning mechanism can move along a sliding rail on the tubular body in the axial direction.
Optionally, the sieve tube is a PVC (polyvinyl chloride) floral tube with the diameter of 32mm, and the connection mode between the sieve tubes is a threaded connection.
Optionally, the drilling track appearance includes drilling track appearance probe and explosion-proof cell-phone, and drilling track appearance probe can be connected with explosion-proof cell-phone bluetooth in order to transmit measured data to explosion-proof cell-phone.
Optionally, a three-axis magnetic sensor and a three-axis gravity sensor are arranged in the drilling track plotter probe tube to respectively sense the earth magnetic field and the gravity field, and the drilling azimuth, the drilling inclination angle and the drilling tool face angle of different depths are obtained through signal processing and attitude calculation.
Compared with the prior art, the utility model has the beneficial technical effects that:
(1) the utility model utilizes the large-through-hole triangular spiral drill rod to enable the sieve tube with the hanger to be sent into a drill hole through the center of the drill rod, and the openable drill bit is adopted to enable the hanger at the front end of the sieve tube to extend out of the drill bit and open the umbrella-shaped fixed wings to fix the sieve tube at the bottom of the hole, so that the drilling track measuring probe tube can be sent into the sieve tube through the carbon fiber push rod to measure the drilling track after the drill is lifted. By the method and the device, a complete drilling, protecting and testing integrated solution for the gas drainage and drilling of the soft coal seam is formed.
(2) The method can realize the consistency and maximization of drilling, hole protection and measurement, has effective operation method, well solves the problems and defects of the existing gas extraction drilling construction method, and is worthy of popularization and application in the fields of gas extraction drilling construction of high ground stress, high gas, complex stratum and soft coal seam.
Drawings
FIG. 1 is a schematic view of the overall structure of the present invention;
FIG. 2 is a schematic view of the drill head of the present invention;
FIG. 3 is a schematic view of the hanger of the present invention;
fig. 4 is a flow chart of the operation of the present invention.
The reference numerals have the meanings given below:
1. the drilling machine comprises a large-drift-diameter triangular drilling rod, 2, an openable drill bit, 3, a sieve tube and 4, a hanger; 201. a bit body, 202, an outer bit head, 203, a center bit head; 401. tubular body, 402, fixed wing, 403, stay bar, 404, spring tensioning mechanism, 405, slide rail.
Detailed Description
The utility model provides a drilling hole protection measurement integrated device suitable for soft coal seam gas extraction drilling construction, which can realize the consistency and maximization of the drilling depth, the sieve tube depth and the drilling track measurement depth, and provides a new construction method and a new construction device for the soft coal seam gas extraction drilling construction.
The following describes in detail specific embodiments of the present invention. It should be understood that the detailed description and specific examples, while indicating the present invention, are given by way of illustration and explanation only, not limitation.
This embodiment provides a bore in soft coal seam drilling construction and protect and survey integrated device, including big three-edged drill rod of latus rectum 1, dress in the open and close formula drill bit 2, screen pipe 3 of big three-edged drill rod of latus rectum 1 front end, dress 4 and the drilling track appearance at the hanger of screen pipe 3 front end.
The openable drill 2 comprises a drill body 201 with a central through hole, an outer drill bit 202 is arranged at the front end edge of the drill body 201, an openable central drill bit 203 is arranged at the front end face of the drill body 201, and the central drill bit 203 can be opened to enable the central through hole of the drill body 201 to be communicated when axial force is applied to the central drill bit 203 from the inside of the central through hole of the drill body 201; the hanger 4 includes a tubular body 401, and two fixing wings 402 capable of being opened toward both sides of the tubular body 401 are provided in the tubular body 401.
The inner diameters of the openable drill bit 2 and the large-drift-diameter triangular drill rod 1 are larger than the outer diameters of the hanger 4 and the sieve tube 3, and the inner diameter of the sieve tube 3 is larger than the outer diameter of the drilling track instrument; after the openable drill bit 2 and the large-drift-diameter three-edged drill rod 1 are drilled in place, the hanger 4 and the sieve tube 3 can extend to the top-open central drill bit tool bit 203 along the central through hole of the large-drift-diameter three-edged drill rod 1 so that the hanger 4 extends out of the openable drill bit 2 and is fixed at the bottom of the hole through the opened fixing wings 402, and the drilling trajectory instrument can be sent into the drill hole from the central hole of the sieve tube 3 to measure the drilling trajectory.
The drill bit body 201 front end is the round platform form, and outer drill bit tool bit 202 has a plurality ofly, and a plurality of outer drill bit tool bits 202 are along drill bit body 201 front end edge circumference equipartition, in this embodiment, are equipped with three outer drill bit tool bit 202, in other embodiments, can set up the outer drill bit tool bit 202 that corresponds quantity according to operating condition needs.
The drill bit body 201 front end terminal surface is equipped with the mounting groove, and center drill bit tool bit 203 is located this mounting groove, and center drill bit tool bit 203 one end is articulated with drill bit body 201 front end terminal surface, and the center drill bit tool bit 203 other end is equipped with anticreep groove and the protruding cooperation of anticreep on this anticreep groove and the mounting groove cell wall, and when center drill bit tool bit 203 was closed, center drill bit tool bit 203 was located the mounting groove and anticreep groove and the protruding cooperation of anticreep were with the spacing closure of center drill bit tool bit 203.
The center bit 203 is closed opposite the center through hole of the bit body 201.
The large-drift-diameter triangular drill rod 1 in the embodiment is a triangular spiral drill rod with the outer diameter phi 73mm and the inner diameter phi 36 mm. The triangular spiral drill rod has good slag discharging performance relative to an outer flat drill rod, is widely applied to soft coal drilling, and is used for improving a common triangular drill rod by a sieve tube in the drill rod, wherein the inner diameter is enlarged from phi 25mm to phi 36mm, the outer diameter is kept to phi 73mm, and the sieve tube in the drill rod can be discharged due to the increase of the inner diameter; the large-drift-diameter triangular drill rod is matched with a drilling machine with the torque not more than 3200 and a switchable drill bit with the diameter of 103mm, and the requirements of drilling construction of a common rotary drilling machine are completely met.
The front ends of the two fixed wings 402 of the hanger 4 are arranged in the tubular body 401 through the same pin shaft, and the two fixed wings 402 can rotate along the pin shaft until the two fixed wings 402 open towards the two sides of the tubular body 401; a through hole penetrating both sides is provided in the tubular body 401 to allow the two stationary blades 402 to be opened from the inside of the tubular body 401 to both sides.
The two fixed wings 402 are hinged with support rods 403, the rear ends of the two support rods 403 are connected to a spring tensioning mechanism 404 in the tubular body 401, and the spring tensioning mechanism 404 can move axially along a slide rail 405 on the tubular body 401.
When the hanger 4 is fed into the large-drift-diameter three-edged drill rod 1, due to the restraint of the inner diameter of the large-drift-diameter three-edged drill rod 1, the fixed wings 402 shrink in the cavity of the hanger 4, when the hanger 4 at the front end of the sieve tube 3 is lowered to the openable drill bit 2, the front end of the hanger 4 pushes the center drill bit 203 of the openable drill bit 2 to extend out, due to the spring force of the spring tensioning mechanism 404, the two fixed wings 402 are opened in an umbrella shape, when the hanger 4 is pulled backwards, the fixed wings 402 of the hanger 4 can be clamped on the inner wall of a drilled hole, and therefore the sieve tube 3 and the hanger 4 are kept still during drilling withdrawal.
The sieve tube 3 in the embodiment is a PVC flower tube with the diameter phi of 32mm, and the connection mode between each section of sieve tube 3 is threaded connection.
The hanger in this embodiment has a rear end that is threaded to the screen.
The drilling track appearance includes drilling track appearance probe and explosion-proof cell-phone, and drilling track appearance probe can be connected with explosion-proof cell-phone bluetooth in order to transmit measured data to explosion-proof cell-phone.
The drilling track plotter probe is internally provided with a three-axis magnetic sensor and a three-axis gravity sensor, and more particularly, a signal extraction circuit, a master control circuit, a power supply circuit, a lithium ion battery pack and the like are further arranged inside the drilling track plotter probe with the diameter phi of 21mm, after the drilling track plotter probe is sent into a drilled hole, the three-axis magnetic sensor and the three-axis gravity sensor respectively sense the earth magnetic field and the gravity field, drilling azimuth angles, dip angles and tool face angles of different depths are obtained through signal processing and attitude resolving, and meanwhile, the explosion-proof mobile phone records the depth and time of sampling points. And after the measurement is finished, the tracing instrument probe is started, is in Bluetooth connection with the explosion-proof mobile phone, transmits the measurement data to the explosion-proof mobile phone, and then performs drilling track calculation and mapping.
By the device, drilling hole protection and drilling measurement are implemented as an integral process, and the method comprises the following steps: firstly, drilling construction is carried out by using a large-drift-diameter triangular drill rod (the diameter of a through hole is phi 36mm) provided with an openable and closable drill bit (the diameter of the drill bit is phi 103mm), and drilling cuttings in the hole are cleaned after the drilling construction is finished; installing a hanger at the end of a phi 32mm sieve tube, feeding the sieve tube provided with the hanger into a hole from the center of the tail part of a drill rod, jacking a primary hinged inner gap of an openable drill bit to extend out of the drill bit by the hanger at the front end of the sieve tube down to the drill bit, and opening an umbrella-shaped telescopic fixed wing by the hanger to be fixed at the bottom of the hole; then, the drill rod and the drill bit capable of being opened and closed are pulled out, the hand-push type track instrument with the outer diameter phi of 21mm is sent into the hole from the center of the tail part of the sieve tube through the carbon fiber pushing rod to carry out drilling track measurement, the drilling track instrument is pulled out after the measurement is completed to carry out track calculation and mapping, finally, drilling and hole sealing are completed, and drilling hole protection and measurement integrated operation is completed. By the drilling, protecting and measuring integrated construction method, drilling in place, protecting to the bottom and measuring to the bottom are really realized, extraction blind areas are eliminated or reduced, and the effect of drilling gas extraction is improved.
Claims (10)
1. The drilling, protecting and measuring integrated device in the drilling construction of the soft coal seam is characterized by comprising a large-drift-diameter triangular drill rod (1), an openable drill bit (2) arranged at the front end of the large-drift-diameter triangular drill rod (1), a sieve tube (3), a hanger (4) arranged at the front end of the sieve tube (3) and a drilling track instrument;
the openable drill bit (2) comprises a drill bit body (201) with a central through hole, an outer drill bit head (202) is arranged at the edge of the front end of the drill bit body (201), an openable central drill bit head (203) is arranged at the end face of the front end of the drill bit body (201), and the central drill bit head (203) can be opened to enable the central through hole of the drill bit body (201) to be communicated when axial force is applied to the central drill bit head (203) from the inside of the central through hole of the drill bit body (201); the hanger (4) comprises a tubular body (401), and two fixing wings (402) which can be opened towards two sides of the tubular body (401) are arranged in the tubular body (401);
the inner diameters of the openable drill bit (2) and the large-drift-diameter triangular drill rod (1) are larger than the outer diameters of the hanger (4) and the sieve tube (3), and the inner diameter of the sieve tube (3) is larger than the outer diameter of the drilling track instrument; after the openable drill bit (2) and the large-drift-diameter three-edged drill rod (1) are drilled in place, the hanger (4) and the sieve tube (3) can extend to the top of the center drill bit tool bit (203) along the center through hole of the large-drift-diameter three-edged drill rod (1) so that the hanger (4) extends out of the openable drill bit (2) and is fixed at the bottom of the hole through the opened fixing wings (402), and the drilling track instrument can be sent into the drill hole from the center hole of the sieve tube (3) to perform drilling track measurement so as to complete drilling hole protection and measurement integrated operation.
2. The drilling, protecting and testing integrated device for the soft coal seam drilling construction according to claim 1, wherein the front end of the drill bit body (201) is in a circular truncated cone shape, the number of the outer drill bit heads (202) is multiple, and the multiple outer drill bit heads (202) are uniformly distributed along the circumferential direction of the front end edge of the drill bit body (201).
3. The integrated drilling, protecting and testing device for soft coal seam drilling construction according to claim 1, wherein the front end face of the drill body (201) is provided with a mounting groove, the center drill bit (203) is located in the mounting groove, one end of the center drill bit (203) is hinged to the front end face of the drill body (201), the other end of the center drill bit (203) is provided with an anti-drop groove which is matched with the anti-drop protrusion on the wall of the mounting groove, when the center drill bit (203) is closed, the center drill bit (203) is located in the mounting groove and is matched with the anti-drop protrusion to limit the center drill bit (203) to be closed.
4. The integrated drilling, protecting and measuring device for soft coal seam drilling construction according to claim 3, wherein the central drill bit (203) is opposite to the central through hole of the drill bit body (201) when closed.
5. The drilling, protecting and testing integrated device in the soft coal seam drilling construction according to claim 1, wherein the large-drift-diameter triangular drill rod (1) is a triangular spiral drill rod with an outer diameter of phi 73mm and an inner diameter of phi 36 mm.
6. The drilling, protecting and testing integrated device in the soft coal seam drilling construction according to claim 1, wherein the front ends of the two fixed wings (402) of the hanger (4) are installed in the tubular body (401) through the same pin shaft, and the two fixed wings (402) can rotate along the pin shaft until the two fixed wings (402) are opened towards the two sides of the tubular body (401); the tubular body (401) is provided with a through hole penetrating through both sides so that the two fixed wings (402) can be opened to both sides from the inside of the tubular body (401).
7. The drilling, protecting and testing integrated device in the drilling construction of the soft coal seam as claimed in claim 6, wherein the two fixed wings (402) are hinged with support rods (403), the rear ends of the two support rods (403) are connected to a spring tensioning mechanism (404) in the tubular body (401), and the spring tensioning mechanism (404) can axially move along a slide rail (405) on the tubular body (401).
8. The drilling, protecting and testing integrated device in the drilling construction of the soft coal seam as claimed in claim 1, wherein the sieve tube (3) is a PVC perforated pipe with the diameter of 32mm, and the connection mode between each section of sieve tube (3) is threaded connection.
9. The integrated drilling and protecting device in the soft coal seam drilling construction is characterized in that the drilling track plotter comprises a drilling track plotter probe and an explosion-proof mobile phone, and the drilling track plotter probe can be connected with the explosion-proof mobile phone through Bluetooth to transmit measurement data to the explosion-proof mobile phone.
10. The integrated drilling, protecting and testing device in the drilling construction of the soft coal seam according to claim 9, wherein a three-axis magnetic sensor and a three-axis gravity sensor are arranged in the drilling track instrument probe.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122524059.9U CN216477133U (en) | 2021-10-19 | 2021-10-19 | Drilling, protecting and measuring integrated device in drilling construction of soft coal seam |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122524059.9U CN216477133U (en) | 2021-10-19 | 2021-10-19 | Drilling, protecting and measuring integrated device in drilling construction of soft coal seam |
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| Publication Number | Publication Date |
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| CN216477133U true CN216477133U (en) | 2022-05-10 |
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| CN202122524059.9U Active CN216477133U (en) | 2021-10-19 | 2021-10-19 | Drilling, protecting and measuring integrated device in drilling construction of soft coal seam |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115045640A (en) * | 2022-06-27 | 2022-09-13 | 中煤科工集团西安研究院有限公司 | Device and method for pulling screen pipe in opposite directions through penetrating drilled holes |
-
2021
- 2021-10-19 CN CN202122524059.9U patent/CN216477133U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115045640A (en) * | 2022-06-27 | 2022-09-13 | 中煤科工集团西安研究院有限公司 | Device and method for pulling screen pipe in opposite directions through penetrating drilled holes |
| CN115045640B (en) * | 2022-06-27 | 2024-03-22 | 中煤科工集团西安研究院有限公司 | Device and method for penetrating through borehole and opposite-pulling lower screen pipe |
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