CN113700522B - Gas extraction process method for lower screen pipe while drilling and matched lower screen pipe drill bit - Google Patents
Gas extraction process method for lower screen pipe while drilling and matched lower screen pipe drill bit Download PDFInfo
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- CN113700522B CN113700522B CN202111031316.3A CN202111031316A CN113700522B CN 113700522 B CN113700522 B CN 113700522B CN 202111031316 A CN202111031316 A CN 202111031316A CN 113700522 B CN113700522 B CN 113700522B
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- screen
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- 238000005553 drilling Methods 0.000 title claims abstract description 87
- 238000000605 extraction Methods 0.000 title claims abstract description 69
- 238000000034 method Methods 0.000 title claims abstract description 27
- 239000003245 coal Substances 0.000 claims abstract description 22
- 238000007789 sealing Methods 0.000 claims abstract description 17
- 239000003566 sealing material Substances 0.000 claims abstract description 13
- 238000010276 construction Methods 0.000 claims abstract description 11
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 5
- 239000002893 slag Substances 0.000 claims description 4
- 239000011152 fibreglass Substances 0.000 claims description 3
- 229910052742 iron Inorganic materials 0.000 claims description 3
- 239000004033 plastic Substances 0.000 claims description 3
- 229920003023 plastic Polymers 0.000 claims description 3
- 238000010586 diagram Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000005065 mining Methods 0.000 description 2
- 244000208734 Pisonia aculeata Species 0.000 description 1
- 238000005299 abrasion Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000003034 coal gas Substances 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 230000008030 elimination Effects 0.000 description 1
- 238000003379 elimination reaction Methods 0.000 description 1
- 230000013011 mating Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
Classifications
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21F—SAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, OR DRAINING IN OR OF MINES OR TUNNELS
- E21F7/00—Methods or devices for drawing- off gases with or without subsequent use of the gas for any purpose
-
- 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
- E21B43/006—Production of coal-bed methane
-
- 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
- E21B43/02—Subsoil filtering
- E21B43/08—Screens or liners
- E21B43/086—Screens with preformed openings, e.g. slotted liners
-
- 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
- E21B43/02—Subsoil filtering
- E21B43/10—Setting of casings, screens, liners or the like in wells
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21F—SAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, OR DRAINING IN OR OF MINES OR TUNNELS
- E21F17/00—Methods or devices for use in mines or tunnels, not covered elsewhere
Landscapes
- Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Life Sciences & Earth Sciences (AREA)
- Geology (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Environmental & Geological Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- General Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Dispersion Chemistry (AREA)
- Earth Drilling (AREA)
Abstract
The invention discloses a gas extraction process method of a screen pipe while drilling, which comprises the following steps of: a drilling machine of a roadway I on one side of the working surface of the coal bed is utilized, a drill rod and a conventional drill bit for drilling are utilized to construct a drill hole to penetrate the working surface to a roadway II on the other side, and a drill hole is formed; changing a conventional drilling bit into a lower screen pipe bit, wherein two ends of the lower screen pipe bit are respectively connected with the drill rod and the adapter, the other end of the adapter is connected with a plurality of screen pipes which are sequentially connected, the lower screen pipe bit is driven by a drilling machine to rotate and back to a roadway I, and meanwhile, the lower screen pipe bit brings the plurality of screen pipes which are sequentially connected to a drilling hole opening of the roadway I through the adapter; and (3) removing the sieve tube at the drilling hole opening position of the roadway I and the roadway II, and sealing the hole sealing sections of the roadway I and the roadway II by using a hole sealing material. The invention also provides a matched well screen pipe drill bit. The process method and the lower screen pipe drill bit solve the problems that deformation and collapse affect coal extraction after drilling construction and the lower screen pipe is not easy to send.
Description
Technical Field
The invention relates to the technical field of coal gas extraction, in particular to a drilling-while-drilling lower screen pipe gas extraction process method and a matched lower screen pipe drill bit.
Background
Gas is an important disaster causing hidden trouble in the coal mining process. At present, a mode of constructing seam bedding holes is generally adopted to continuously extract gas existing on a working face coal body, so that the effects of anti-reflection and outburst elimination are achieved.
In the traditional extraction process, long drilling holes which do not pass through the coal seam are respectively constructed along the coal seam by adopting roadways on two sides of the working face, hole sealing is respectively carried out at the positions of two drilling holes, a gas extraction pipeline and an extraction pump station are respectively connected, gas in the coal seam is extracted, extraction drilling holes are respectively constructed on two sides of the roadway, and the engineering quantity is large; after the bedding hole is constructed, in the extraction process, due to the influence of ground stress and mining, deformation, collapse and the like of drilling holes are easy to occur, extraction effects are influenced, and two common screen-under-drilling modes at present mainly exist, one screen-under-drilling mode is that a screen pipe is put down through the middle part of a drill rod, and the screen-under-drilling mode has the problem of small size due to the limitation of the inner diameter of the drill rod; the other is a screen pipe on the same side outside the drill rod, and the problems of complex construction process and high requirement on the abrasion resistance of the screen pipe exist.
Disclosure of Invention
The invention aims to provide a gas extraction process method of a screen pipe under drilling and a screen pipe under matching drill bit so as to solve the problems in the background art.
In order to achieve the above purpose, the present invention provides the following technical solutions:
a gas extraction process method of a screen pipe while drilling comprises the following steps:
step one: a drilling machine of a roadway I on one side of the working surface of the coal bed is utilized, a drill rod and a conventional drill bit for drilling are utilized to construct a drill hole to penetrate the working surface to a roadway II on the other side, and a drill hole is formed;
step two: the conventional drilling bit is replaced by a lower screen pipe bit, two ends of the lower screen pipe bit are respectively connected with the drill rod and the adapter, and the other end of the adapter is connected with a plurality of screen pipes which are sequentially connected;
step three: the drilling machine drives the lower screen pipe drill bit to rotationally retract to the roadway I, the lower screen pipe drill bit brings a plurality of screen pipes which are sequentially connected to a drilling hole opening of the roadway I through the adapter, and meanwhile, water is injected into the drill rod and the lower screen pipe drill bit through the high-pressure pump station, so that jet slag discharge is realized;
step four: removing sieve tubes at the positions of drilling holes of the roadway I and the roadway II, sealing the hole sealing sections of the roadway I and the roadway II by using a hole sealing material, burying a gas extraction pipe in the middle of the hole sealing material of the roadway I and/or the roadway II, wherein one end of the gas extraction pipe extends into the sieve tubes, the other end of the gas extraction pipe is connected with a gas extraction main pipeline, and the gas extraction main pipeline is additionally connected with a gas extraction pump station;
step five: repeating the first to fourth steps to finish the construction of multiple groups of extraction drilling holes on the working face and the hole sealing continuous extraction.
Further, the drilling machine is a directional drilling machine, the conventional drilling bit is a screw drill bit, the drill rod is a directional drill rod, and the whole coal seam working face is penetrated through construction directional drilling.
Further, the sieve tube is made of PVC, PE hard plastic, glass fiber reinforced plastic or iron pipe.
Further, the screen outer diameter is less than the maximum outer diameter of the lower screen drill bit, which is less than the maximum outer diameter of conventional drill bits.
Furthermore, the adapter can also be a bearing with a flange, and the lower screen pipe drill bit and the screen pipe can rotate relatively after being connected through the bearing with the flange.
Further, a drilling machine for jacking pipes is arranged on one side of the roadway II, and assistance is provided for rotation and movement of the screen pipe and the lower screen pipe drill bit.
The invention also provides a matched lower screen pipe drill bit of the gas extraction process method of the lower screen pipe while drilling, which comprises a drill rod connecting section, drill bit gear teeth, drill bit jet holes, a drill bit body and end connectors; the drill bit body is arranged at the tail end of the drill rod connecting section, at least 3 groups of drill bit gear teeth are distributed on the drill bit body, a plurality of groups of drill bit jet holes are uniformly distributed on the drill rod connecting section along the circumferential direction, a downward protruding end connector is arranged at the center of the bottom end face of the drill bit body, the end connector is of an annular boss structure, an internal thread is arranged on the annular boss and used for being connected with an adapter and then connected with a sieve tube.
Further, the drill rod connecting section is in a hollow cylinder shape, and the top end of the hollow cylinder is provided with an internal thread.
Further, 4 bolts are provided on the bottom surface of the end connector for connection with the flanged bearing.
Further, the drill bit jet holes are totally provided with 4 groups, and every two drill bit jet holes which are vertically distributed up and down form one group.
Compared with the prior art, the invention has the beneficial effects that: according to the gas extraction process method for the lower screen pipe while drilling and the lower screen pipe drill bit, the coal body is extracted in a mode of penetrating the coal body and the lower screen pipe while drilling, so that the problems that deformation collapse influences coal body extraction after drilling construction and the lower screen pipe is difficult to send in are solved, compared with the lower screen pipe while drilling in a drill rod, the gas extraction process method has the advantages of being free of influence of the inner diameter of the drill rod and large in size of the lower screen pipe, compared with the lower screen pipe while drilling on the same side outside the drill rod, the gas extraction process method has the advantages of being low in screen pipe material requirement and simple in process, and means are provided for continuous and effective extraction of gas on coal bodies on working surfaces.
Drawings
The invention is further described below with reference to the drawings and the detailed description.
FIG. 1 is a schematic diagram of a conventional borehole construction of the present invention;
FIG. 2 is a schematic illustration of a screen while drilling according to the present invention;
FIG. 3 is a schematic diagram of hole sealing extraction of the gas extraction pipe buried in the middle of the hole sealing material of the roadway I;
FIG. 4 is a schematic diagram of hole sealing extraction of the gas extraction pipe of the present invention buried in the middle of the hole sealing materials of roadway I and roadway II;
FIG. 5 is a schematic view of a well head of a screen according to the present invention;
FIG. 6 is a schematic view of the bottom structure of FIG. 5;
in the figure: 101. a drilling machine; 102. a drill rod; 103. conventional drill bits for drilling; 104. drilling holes; 105. a high-pressure pump station; 201. a screen pipe drill bit; 2011. a drill pipe connection section; 2012. drill gear teeth; 2013. drill bit jet holes; 2014. a bit body; 2015. an end connector; 301. an adapter; 302. a screen pipe; 303. a hole sealing section; 304. a gas extraction pipe; 305. a gas extraction main pipeline; 306. and (5) pumping and extracting the pump station.
Detailed Description
The present invention will be described in further detail with reference to the following examples in order to make the objects, technical solutions and advantages of the present invention more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.
Example 1
Referring to fig. 1-3, a gas extraction process method for a screen pipe while drilling comprises the following steps:
step one: using a drilling machine 101 of a roadway I on one side of a coal seam working surface, and constructing a drill hole through the working surface to a roadway II on the other side through a drill rod 102 and a conventional drill bit 103 for drilling to form a drill hole 104;
step two: changing a conventional drilling bit 103 into a lower screen pipe bit 201, wherein two ends of the lower screen pipe bit 201 are respectively connected with the drill rod 102 and the adapter 301, and the other end of the adapter 301 is connected with a plurality of screen pipes 302 which are sequentially connected;
step three: the drilling machine 101 drives the lower screen pipe drill bit 201 to rotationally retract to a roadway I, the lower screen pipe drill bit 201 brings a plurality of screen pipes 302 which are sequentially connected to the hole opening of a drill hole 104 of the roadway I through an adapter 301, and meanwhile, water is injected into the drill rod 102 and the lower screen pipe drill bit 201 through the high-pressure pump station 105, so that jet slag discharge is realized;
step four: removing a sieve tube 302 at the hole opening position of a drilling hole 104 of a roadway I and a roadway II, sealing the hole sealing sections 303 of the roadway I and the roadway II by using a hole sealing material, burying a gas extraction tube 304 in the middle of the hole sealing material on one side of the roadway I or the roadway II (the gas extraction tube 304 is buried in the middle of the hole sealing material on one side of the roadway I and is not buried in the middle of the hole sealing material on one side of the roadway II in the drawing shown in FIG. 3), extending one end of the gas extraction tube 304 into the sieve tube 302, connecting the other end of the gas extraction tube with a gas extraction main pipeline 305, and connecting the gas extraction main pipeline 305 with a gas extraction pump station 306;
step five: repeating the first to fourth steps to finish the construction of multiple groups of extraction drilling holes on the working face and the hole sealing continuous extraction.
When the working surface distance is long, the drilling machine 101 is a directional drilling machine, the conventional drilling bit 103 is a screw drill bit, the drill rod 102 is a directional drill rod, and the whole coal seam working surface is penetrated by constructing the directional drilling 104.
The drill hole 104 can be constructed by adopting water drilling and deslagging or air drilling and deslagging.
The screen pipe 302 is a screen pipe commonly used in mines, and in order to reduce the influence of the screen pipe 302 on a coal cutter in the stoping process of a working face, the screen pipe 302 is made of PVC, PE hard plastic, glass fiber reinforced plastic or iron pipe materials.
Preferably, the outer diameter of the screen 302 is designed to be smaller than the maximum outer diameter of the screen bit 201, since the borehole 104 will be deformed after construction of the conventional drill bit 103, so that the resistance during pull-back will be relatively small. The maximum outer diameter of the lower screen drill bit 201 is smaller than the maximum outer diameter of the conventional drill bit 103, so that reaming is not required during the withdrawal in step three, and the resistance of the drilling machine 101 is small.
The adaptor 301 may be replaced by a bearing with a flange (the conventional structure is not shown in the drawing), and the drill bit 201 of the lower screen pipe is connected to the screen pipe 302 through the bearing with a flange to realize relative rotation; by adopting the connection mode of the bearing with the flange plate, the drill rod 102 can rotate in the retracting process without driving the screen pipe 302 to rotate, otherwise, the drill rod and the screen pipe rotate together, and the torque requirement on the drilling machine is higher.
Preferably, a drilling machine (not shown in the figure) for jacking pipes can be arranged on one side of the roadway II to provide assistance for rotation and movement of the screen 302 and the lower screen drill bit 201.
Example 2
The difference from example 1 is that the fourth step is specifically: and removing the sieve tube 302 at the hole opening position of the drilling hole 104 of the roadway I and the roadway II, sealing the hole sealing sections 303 of the roadway I and the roadway II by using a hole sealing material, burying a gas extraction pipe 304 (shown in fig. 4) in the middle of the hole sealing materials at one side of the roadway I and one side of the roadway II, wherein one end of the gas extraction pipe 304 extends into the sieve tube 302, the other end of the gas extraction pipe 304 is connected with a gas extraction main pipeline 305, and the gas extraction main pipeline 305 is additionally connected with a extraction pump station 306.
Example 3
Referring to fig. 5-6, the present invention also provides a mating lower screen drill bit of the gas extraction process of the lower screen while drilling according to embodiments 1 and 2, which comprises a drill pipe connecting section 2011, drill gear teeth 2012, a drill jet hole 2013, a drill body 2014 and an end connector 2015; the drill bit body 2014 is disposed at the end of the drill rod connecting section 2011, six groups of drill bit teeth 2012 are distributed on the drill bit body 2014, multiple groups of drill bit jet holes 2013 are uniformly distributed on the drill rod connecting section 204 along the circumferential direction, a through hole is formed in the center of the drill bit body 2014, an end connector 2015 is downwardly extending from the through hole at the center of the bottom end surface of the drill bit body 2014, the end connector 2015 is of an annular boss structure, and internal threads are arranged on the annular boss.
The drill rod connecting section 2011 is in a hollow cylinder shape, an internal thread is arranged at the top end of the hollow cylinder, and the drill rod 102 is connected with the lower screen pipe drill bit 201 through the internal thread of the drill rod connecting section 2011.
The bottom surface of the end connector 2015 is provided with 4 bolts for connecting with a flanged bearing, and the lower screen drill 201 and the screen 302 are connected through the flanged bearing to realize relative rotation.
The drill jet holes 2013 are arranged in 4 groups, each two drill jet holes 2013 vertically distributed up and down are one group, and the drill jet holes 2013 are used for jet deslagging.
Preferably, a high-pressure nozzle is arranged in the drill bit jet hole 2013, and in the third withdrawal process, jet secondary coal breaking and slag discharging are realized by injecting high-pressure water;
according to the gas extraction process method for the screen pipe while drilling and the screen pipe drill bit, the coal body is extracted by adopting the mode of drilling through the coal body and the screen pipe while drilling, so that the problems that deformation collapse influences coal body extraction after drilling construction and the screen pipe is difficult to send in after the screen pipe is solved.
The foregoing description of the preferred embodiments of the invention is not intended to be limiting, but rather is intended to cover all modifications, equivalents, and alternatives falling within the spirit and principles of the invention.
Claims (10)
1. The gas extraction process method of the screen pipe while drilling is characterized by comprising the following steps of:
step one: a drilling machine of a roadway I on one side of the working surface of the coal bed is utilized, a drill rod and a conventional drill bit for drilling are utilized to construct a drill hole to penetrate the working surface to a roadway II on the other side, and a drill hole is formed;
step two: the conventional drilling bit is replaced by a lower screen pipe bit, two ends of the lower screen pipe bit are respectively connected with the drill rod and the adapter, and the other end of the adapter is connected with a plurality of screen pipes which are sequentially connected;
step three: the drilling machine drives the lower screen pipe drill bit to rotationally retract to the roadway I, the lower screen pipe drill bit brings a plurality of screen pipes which are sequentially connected to a drilling hole opening of the roadway I through the adapter, and meanwhile, water is injected into the drill rod and the lower screen pipe drill bit through the high-pressure pump station, so that jet slag discharge is realized;
step four: removing sieve tubes at the positions of drilling holes of the roadway I and the roadway II, sealing the hole sealing sections of the roadway I and the roadway II by using a hole sealing material, burying a gas extraction pipe in the middle of the hole sealing material of the roadway I and/or the roadway II, wherein one end of the gas extraction pipe extends into the sieve tubes, the other end of the gas extraction pipe is connected with a gas extraction main pipeline, and the gas extraction main pipeline is additionally connected with a gas extraction pump station;
step five: repeating the first to fourth steps to finish the construction of multiple groups of extraction drilling holes on the working face and the hole sealing continuous extraction.
2. The gas extraction process of the screen pipe while drilling as claimed in claim 1, wherein the drilling machine is a directional drilling machine, the conventional drilling bit is a screw bit, the drill rod is a directional drill rod, and the entire coal seam working surface is penetrated by directional drilling during construction.
3. The gas extraction process method for the screen pipe while drilling as claimed in claim 1, wherein the screen pipe is made of PVC, PE hard plastic, glass fiber reinforced plastic or iron pipe.
4. The method of gas drainage while drilling, as set forth in claim 1, wherein the screen outer diameter is less than a maximum outer diameter of a screen-while-drilling drill bit, the maximum outer diameter of the screen-while-drilling drill bit being less than a maximum outer diameter of a conventional drill bit.
5. The gas extraction process of a lower screen while drilling as claimed in claim 1, wherein the adapter is a flanged bearing, and the lower screen drill bit is rotatable relative to the screen after being connected to the screen via the flanged bearing.
6. The gas extraction process method of the screen pipe while drilling according to claim 1, wherein a drilling machine for jacking pipes is arranged on one side of the roadway II, and assistance is provided for rotation and movement of the screen pipe and the screen pipe drill bit.
7. The well-matched well-screen drill bit of any one of claims 1-6, comprising a drill pipe connection section, drill gear teeth, drill jet holes, a drill body and end connectors; the drill bit body is arranged at the tail end of the drill rod connecting section, at least 3 groups of drill bit gear teeth are distributed on the drill bit body, a plurality of groups of drill bit jet holes are uniformly distributed on the drill rod connecting section along the circumferential direction, the center of the bottom end face of the drill bit body is provided with a downward protruding end connector, the end connector is of an annular boss structure, and the annular boss is provided with internal threads.
8. The well-matched well-screen drill bit of the well-screen gas extraction process method while drilling as claimed in claim 7, wherein the drill pipe connecting section is in the shape of a hollow cylinder, and the top end of the hollow cylinder is provided with an internal thread.
9. The well-matched well-screen drill bit of the well-screen gas extraction process method while drilling as set forth in claim 7, wherein 4 bolts are provided on the bottom surface of said end connector for connection with a flanged bearing.
10. The well-matched well-screen drill bit of the gas extraction process method of the well-screen while drilling as set forth in claim 7, wherein 4 groups of drill bit jet holes are arranged in total, and every two drill bit jet holes which are vertically distributed up and down are arranged as one group.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111031316.3A CN113700522B (en) | 2021-09-03 | 2021-09-03 | Gas extraction process method for lower screen pipe while drilling and matched lower screen pipe drill bit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111031316.3A CN113700522B (en) | 2021-09-03 | 2021-09-03 | Gas extraction process method for lower screen pipe while drilling and matched lower screen pipe drill bit |
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| Publication Number | Publication Date |
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| CN113700522A CN113700522A (en) | 2021-11-26 |
| CN113700522B true CN113700522B (en) | 2023-09-22 |
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| CN202111031316.3A Active CN113700522B (en) | 2021-09-03 | 2021-09-03 | Gas extraction process method for lower screen pipe while drilling and matched lower screen pipe drill bit |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| 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 |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2004072434A2 (en) * | 2003-02-07 | 2004-08-26 | Weatherford/Lamb, Inc. | Methods and apparatus for wellbore construction and completion |
| CN105863512A (en) * | 2016-04-13 | 2016-08-17 | 中煤科工集团西安研究院有限公司 | Coal mine underground broken soft coal seam ladder pipe-tracing compound directional drilling pore-forming device and method |
| CN108425698A (en) * | 2018-03-19 | 2018-08-21 | 中煤科工集团西安研究院有限公司 | Coal mine down-hole tunnel tunnels method for treating flour dust |
| CN214035761U (en) * | 2020-12-22 | 2021-08-24 | 山西开源益通矿业科技工程有限公司 | This coal seam large aperture gas drainage system |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7926590B2 (en) * | 2007-10-03 | 2011-04-19 | Tesco Corporation | Method of liner drilling and cementing utilizing a concentric inner string |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2004072434A2 (en) * | 2003-02-07 | 2004-08-26 | Weatherford/Lamb, Inc. | Methods and apparatus for wellbore construction and completion |
| CN105863512A (en) * | 2016-04-13 | 2016-08-17 | 中煤科工集团西安研究院有限公司 | Coal mine underground broken soft coal seam ladder pipe-tracing compound directional drilling pore-forming device and method |
| CN108425698A (en) * | 2018-03-19 | 2018-08-21 | 中煤科工集团西安研究院有限公司 | Coal mine down-hole tunnel tunnels method for treating flour dust |
| CN214035761U (en) * | 2020-12-22 | 2021-08-24 | 山西开源益通矿业科技工程有限公司 | This coal seam large aperture gas drainage system |
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| CN113700522A (en) | 2021-11-26 |
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