CN106014258A - Coal mine underground concentric casing directional drilling device and construction method thereof - Google Patents

Coal mine underground concentric casing directional drilling device and construction method thereof Download PDF

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Publication number
CN106014258A
CN106014258A CN201610329723.5A CN201610329723A CN106014258A CN 106014258 A CN106014258 A CN 106014258A CN 201610329723 A CN201610329723 A CN 201610329723A CN 106014258 A CN106014258 A CN 106014258A
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drilling
center
coal mine
directional drilling
hole
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CN106014258B (en
Inventor
姚宁平
张�杰
姚亚峰
黄寒静
曹静
王力
石浩
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Xian Research Institute Co Ltd of CCTEG
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Xian Research Institute Co Ltd of CCTEG
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    • EFIXED CONSTRUCTIONS
    • E21EARTH OR ROCK DRILLING; MINING
    • E21BEARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B7/00Special methods or apparatus for drilling
    • E21B7/04Directional drilling
    • EFIXED CONSTRUCTIONS
    • E21EARTH OR ROCK DRILLING; MINING
    • E21BEARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B17/00Drilling rods or pipes; Flexible drill strings; Kellies; Drill collars; Sucker rods; Cables; Casings; Tubings
    • E21B17/02Couplings; joints
    • E21B17/08Casing joints
    • EFIXED CONSTRUCTIONS
    • E21EARTH OR ROCK DRILLING; MINING
    • E21BEARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B17/00Drilling rods or pipes; Flexible drill strings; Kellies; Drill collars; Sucker rods; Cables; Casings; Tubings
    • E21B17/14Casing shoes for the protection of the bottom of the casing
    • EFIXED CONSTRUCTIONS
    • E21EARTH OR ROCK DRILLING; MINING
    • E21BEARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B7/00Special methods or apparatus for drilling
    • E21B7/04Directional drilling
    • E21B7/06Deflecting the direction of boreholes

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  • Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Geology (AREA)
  • Mining & Mineral Resources (AREA)
  • Physics & Mathematics (AREA)
  • Environmental & Geological Engineering (AREA)
  • Fluid Mechanics (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Mechanical Engineering (AREA)
  • Earth Drilling (AREA)

Abstract

The invention relates to a coal mine underground concentric casing directional drilling device and a construction method thereof. The coal mine underground concentric casing directional drilling device comprises an external hole protection assembly and a center directional drilling assembly, wherein the external hole protection assembly comprises a hole protection casing; the hole protection casing is connected with a hinging connector through a connector; the front end of the hinging connector is connected with a casing shoe through the connector; and the center directional drilling assembly comprises a center drill pipe, a measurement while drilling nipple, a screw rod drilling tool and a center drill bit. During the drilling construction, the drilling hole track is controlled by regulating the bent head facing direction of the inside screw rod drilling tool; when the drilling is performed to the preset depth, the center drill pipe, the measurement while drilling nipple, the screw rod drilling tool and the center drill bit are lifted out of the hole; the casing is left in the hole to achieve the hole protection effect; then, the drilling tool with the diameter being one level smaller than that of the former drilling tool is fed from a hole opening; and the directional drilling construction is continuously performed until the designed depth is reached. By aiming at complicated stratums such as local crushing stratums and mudstone hole shrinkage stratums under a coal mine, the directional long drilling construction is realized; the problems of gas control and water disaster prevention and control of coal mine underground complicated stratums are solved; and the safe and efficient production of the coal mine is guaranteed.

Description

Underground coal mine is with one heart with pipe directional drilling device and construction method thereof
Technical field
The present invention relates to a kind of underground coal mine with one heart with pipe directional drilling device and construction method thereof Using with one heart with pipe directional tool is oriented drilling construction, when creeping into, outer sleeve is along with drilling tool Together in access aperture, after the complex formations such as broken formation or mud stone undergauge, centre drill is proposed Tool, then under enter the combination of little one-level screw rod directional tool and be oriented and creep into, to realize bad ground Directional long borehole is constructed.
Background technology
Use Technology of Directional Drilling to solve coal mine gas improvement and water damage prevents and treats problem process In, usually can meet the pore-formings such as mud stone undergauge, crushed zone collapse hole, high ground stress soft rock stress collapse hole difficult Topic;It is oriented drilling construction at these bad grounds, has that drilling depth is shallow, difficulty of construction The problems such as greatly, accident occurrence probability is high.Run into these strata condition, mainly take to dodge shakiness In determining stratum, hole, the several method such as slip casting and aperture setting of casing guard aperture is processed, but often difficult To obtain preferable effect.
Due to the restriction of formation factor, Technology of Directional Drilling can not give full play to its technical advantage, In this case, for coal mine gob gas control, anti-aspect of harnessing the river, then can only Take other technical method and means to solve problem, such as development work, drill site, increase boring The methods such as construction volume, this just directly increases quantities and construction cost.In this case, Study a kind of drilling follow to manage and protect the method in hole and realize the construction of complex formation directional long borehole there is weight Want meaning.
To this end, the designer of the present invention is in view of drawbacks described above, by concentrating on studies and designing, Comprehensive experience and the achievement being engaged in related industry for a long time for many years, research design goes out a kind of underground coal mine With one heart with pipe directional drilling device and construction method thereof, to overcome drawbacks described above.
Summary of the invention
It is an object of the invention to provide a kind of underground coal mine with one heart with pipe directional drilling device and Its construction method, it is concentric for the bad grounds such as broken, the mud stone undergauge in underground coal mine local With pipe Technology of Directional Drilling method, to realize directional long borehole construction, solve underground coal mine complicated The gas control on stratum and water damage prevent and treat problem, ensure that safety of coal mines efficiently produces.
For solving the problems referred to above, the invention discloses a kind of underground coal mine with one heart with pipe directional drilling Device, comprises outer protective aperture member and center oriented drilling assembly, it is characterised in that:
Described outer protective aperture member comprises guard aperture sleeve pipe, and its front end connects hinged connecing by joint Head, articulated joint front end is connected to casing shoe by joint, and described casing shoe uses roll structure Connecting reaming set, the ora terminalis of described reaming set is provided with multiple cutting element;
Described center oriented drilling assembly comprises center drill rod, measurement while drilling pipe nipple, helicoid hydraulic motor And center bit, the front end of described center drill rod is connected to screw drill by measurement while drilling pipe nipple Tool, the front end of described helicoid hydraulic motor connects has center bit, described center bit and reaming to overlap it Between be provided with quick-disassembly structure, the front-end edge of described center bit is provided with multiple cutting element.
Wherein: use between outer sleeve and casing shoe and be articulated and connected, described articulated joint one end Inner edge is provided with the hinged groove of arc, and one end outer rim is provided with the hinged projection being articulated with in hinged groove, The outer rim of described hinged projection is the segmental arc suitable with hinged groove, thus realizes radially cutting with scissors Connect.
Wherein: center bit is basically identical with reaming set cutting edge height of protrusion, it is achieved Directional Drilling When entering, center bit is consistent with reaming set building force direction.
Wherein: described quick-disassembly structure comprises the axial slide being arranged on center bit and rotates sliding Groove and the positioning convex of reaming set inwall, described axial slide is from the front end of center bit radially Extending to rear portion, described rotary chute is positioned at the middle part of center bit and is communicated in axial slide, Center bit is realized in described positioning convex chute vertically slips into and is positioned rotary chute And being relatively fixed between reaming set.
Also disclose underground coal mine as above with one heart with the construction party of pipe directional drilling device Method, comprises the steps of:
Step one: with pipe directional drilling, connects this BHA and carries out, with pipe directional drilling, boring During entering, helicoid hydraulic motor is driven to rotate by center of rotation drilling rod thus to change helicoid hydraulic motor curved Head towards, external articulation outer tube, joint, casing shoe and reaming set are along with helicoid hydraulic motor elbow court Together change to change, center bit can be changed and reaming is enclosed within the cutting direction at the bottom of hole, Realize directional drilling TRAJECTORY CONTROL;And in outer sleeve together descends hand-hole with drilling tool;
Step 2: propose center drilling tool, when creeping into desired depth, slowly invert centre drill Bar, center bit and reaming set disengage, by center drill rod, measurement while drilling pipe nipple, helicoid hydraulic motor Proposing outside hole with center bit, sleeve pipe plays guard aperture effect in then staying hole;
Step 3: minor diameter directional tool creeps into, enters the screw drill of little one-level diameter from aperture Tool, measure pipe nipple and drill bit proceeds directional drilling construction until projected depth.
By said structure, the underground coal mine of the present invention with one heart with pipe directional drilling device and Its construction method has the effect that
1, the bad ground orientation jumping chisels such as broken, the mud stone undergauge in underground coal mine local it are capable of Construct in hole;
2, can once complete directional drilling and two processing steps of sleeve pipe guard aperture, reduce first to become Behind hole there are risk factor in setting of casing;
3, due to drilling tool revolution, outer sleeve does not turns round, it is to avoid sleeve pipe produces abrasion because of revolution Or damage, casing setting depth and success rate can be improved;
4, the guard aperture effect of sleeve pipe decreases boring naked section length, improves service life of holing, Directional Drilling Technology can be expanded in underground coal mine range of application, it is achieved coal mine gas and water damage are efficiently controlled Reason, saves coal production cost, ensures that safety of coal mines efficiently produces.
The detailed content of the present invention can be obtained by explanation described later and institute's accompanying drawing.
Accompanying drawing explanation
Fig. 1 shows that the underground coal mine of the present invention is with one heart with the structure of pipe directional drilling device is shown It is intended to.
Fig. 2 A-2D respectively illustrates hinged outer tube in the present invention, shoe, reaming set and centre drill The structural representation of head.
Fig. 3 shows that the present invention is with one heart with pipe directional tool creeps into schematic diagram.
Fig. 4 shows that the present invention carries brill schematic diagram after completing with pipe directional drilling with one heart.
Fig. 5 shows that the present invention is with one heart with pipe directional drilling completes rear sleeve guard aperture schematic diagram.
Fig. 6 shows that under the present invention, broken rock directional tool creeps into schematic diagram.
Reference:
1-center drill rod;2-guard aperture sleeve pipe;3-measurement while drilling pipe nipple;4-helicoid hydraulic motor;5-cuts with scissors Joint;6-jointing;7-casing shoe;8-reaming set;9-center bit;10-is axially slided Groove;11-rotary chute;12-minor diameter bar;13-minor diameter measurement while drilling pipe nipple;Under 14- Diameter screw drilling tool;15-small diameter drill bit.
Detailed description of the invention
See Fig. 1, it is shown that the underground coal mine of the present invention is with one heart with pipe directional drilling device.
Described underground coal mine comprises outer protective aperture member and center with pipe directional drilling device with one heart Directional drilling assembly, described outer protective aperture member comprises guard aperture sleeve pipe 2, and it is hollow cylindrical Hollow structure, its front end by joint connect articulated joint 5, articulated joint 5 front end is passed through Jointing 6 is connected to casing shoe 7, sees Fig. 2 C, and described casing shoe 7 uses roll structure Connecting reaming set 8, the ora terminalis of described reaming set 8 is interval with multiple cutting element.
Wherein, seeing Fig. 2 A, inner edge, described articulated joint 5 one end is provided with the hinged groove of arc, One end outer rim is provided with the hinged projection being articulated with in hinged groove, the outer rim of described hinged projection be with The segmental arc that hinged groove is suitable, thus realize the most hinged.
Described center oriented drilling assembly comprises center drill rod 1, measurement while drilling pipe nipple 3, screw rod Drilling tool 4 and center bit 9, the front end of described center drill rod 1 is by measurement while drilling pipe nipple 3 even Being connected to helicoid hydraulic motor 4, described helicoid hydraulic motor 4 front end is provided with elbow, described helicoid hydraulic motor 4 Front end connects center bit 9, for realizing center bit 9 and the collaborative cutting of reaming set 8, It is provided with quick-disassembly structure between described center bit 9 and reaming set 8, sees Fig. 2 B and Fig. 2 D, Described quick-disassembly structure can comprise the axial slide 10 and rotary chute being arranged on center bit 9 11 and reaming overlap the positioning convex of 8 inwalls, described axial slide 10 is from center bit 9 Front end extends radially to rear portion, and described rotary chute 11 is positioned at middle part and the company of center bit 9 Leading in axial slide, described positioning convex can slip into and be positioned to rotate cunning by chute 10 vertically In groove 11, thus realize center bit 9 and reaming set 8 between being relatively fixed, described in The front-end edge of heart drill bit 9 is provided with multiple cutting element.
Seeing Fig. 6, minor diameter directional tool includes minor diameter bar 12, minor diameter measurement while drilling Pipe nipple 13, minor diameter helicoid hydraulic motor 14 and small diameter drill bit 15, described minor diameter bar 12 Front end be connected to minor diameter helicoid hydraulic motor 14 by minor diameter measurement while drilling pipe nipple 13, described The front end of minor diameter helicoid hydraulic motor 14 connects minor diameter lead bit 15, and described minor diameter bores The front-end edge of 15 is provided with multiple broken rock cutting element.
Thus, the present invention passes through said apparatus, can realize underground coal mine underground coal mine local broken, The bad grounds such as mud stone undergauge concentric with pipe directional drilling, to realize directional long borehole construction. Concrete construction method comprises the steps of:
Step one: with one heart with pipe directional drilling, see Fig. 3, loads orientation drilling assembly and protects In aperture member, driving source drives helicoid hydraulic motor 4 to turn round thus drives center bit 9 and reaming set 8 revolutions, under axially feeding power effect, at the bottom of the broken hole of cutting, guard aperture sleeve pipe 2 is at the bottom of hole Reaming set 8 by casing shoe 7, joint 6, hinged outer tube 5 transmission pulling force effects and Aperture feed under thrust, in the lower hand-hole of boring, when piercing, measurement while drilling pipe nipple Borehole survey parameter is delivered to aperture by 3 in real time, and owing to hinged outer tube 5 is at helicoid hydraulic motor 4 Elbow use and be articulated and connected, center bit 9 and reaming are overlapped 8 cutting edges to go out sword basically identical, Center of rotation drilling rod 1 drive helicoid hydraulic motor 4 to turn round thus change helicoid hydraulic motor elbow towards time, External articulation outer tube 5, joint 6, casing shoe 7 and reaming set 8 are along with helicoid hydraulic motor elbow court Together change to change, center bit 9 and reaming set 8 can be changed in the cutting side at the bottom of hole To, it is achieved directional drilling TRAJECTORY CONTROL;And scouring media carries boring mud by outer sleeve 2 He Outside between center drill rod 1, annular clearance returns and portals.
Step 2: propose center drilling tool, uses with one heart with pipe directional tool is by guard aperture sleeve pipe 2 times After desired depth, slowly counterclockwise center of rotation drilling rod 1, center bit 9 along with sleeve pipe Rotary chute 11 at boots 8 cooperation exits, the most gently lifting center drill rod 1, centre drill 9 exit along drilling tool axial slide 10, see Fig. 4, now center bit 9 and reaming Set 8 separation, continue outwards put forward center drill rod 1, by center drill rod 1, measurement while drilling pipe nipple 3, Helicoid hydraulic motor 4 and center bit 9 propose outside hole, outer protective hole sleeve 2, articulated joint 5, Jointing 6, casing shoe 7 and reaming set 8 are then stayed in hole, play guard aperture effect, participate in Fig. 5.
Step 3: minor diameter directional tool creeps into, sees Fig. 6, connect minor diameter bar 12, Minor diameter measurement while drilling pipe nipple 13, minor diameter helicoid hydraulic motor 14 and small diameter drill bit 15, from protecting In hole sleeve 2 at the bottom of lower hand-hole, now sleeve pipe 2 plays guard aperture effect, and scouring media driving is little directly Footpath helicoid hydraulic motor 14 rotor turns round thus drives small diameter drill bit 15 to turn round, under feeding effect Broken hole bed rock stone.
Borehole survey parameter is then passed to aperture by minor diameter measurement while drilling pipe nipple 13 in real time, and then The elbow of adjustment minor diameter helicoid hydraulic motor 14 is towards being oriented drilling track control, until boring Enter design hole depth.Scouring media, from the bottom of the access aperture of minor diameter bar 12 center, carries boring mud After returning to reaming set position outside drilling rod and hole wall gap, further along ring between sleeve pipe and drilling rod Empty gap is returned outside portalling.
The present invention is capable of the complex formation directional long boreholes such as broken, the mud stone undergauge in local and executes Work, due to sleeve pipe guard aperture effect, it is to avoid bore hole boring collapse hole lost efficacy, it is ensured that the use of boring In the life-span, for aspects such as coal mine gas extraction, water damage preventing and treatings, there is meaning of crucial importance.
The unstable formations such as the present invention is broken for local, mud stone undergauge, can use with one heart with pipe Directional tool combination is oriented drilling construction, for relatively hard rock, can use brokenly rock drilling group Part carries out brokenly rock operation.
It is readily apparent that above description and record are only to illustrate rather than in order to limit this Disclosure of the invention content, apply or use.Although describing the most in an embodiment and attached Figure describes embodiment, but the present invention is not intended to by accompanying drawing example and describes in an embodiment As it is now recognized that optimal mode with implement the teachings of the present invention specific examples, the present invention's Scope will include any embodiment falling into description and appended claims above.

Claims (5)

1. underground coal mine is with one heart with a pipe directional drilling device, comprise outer protective aperture member and in Heart directional drilling assembly, it is characterised in that:
Described outer protective aperture member comprises guard aperture sleeve pipe, and its front end connects hinged connecing by joint Head, articulated joint front end is connected to casing shoe by joint, and described casing shoe uses roll structure Connecting reaming set, the ora terminalis of described reaming set is provided with multiple cutting element;
Described center oriented drilling assembly comprises center drill rod, measurement while drilling pipe nipple, helicoid hydraulic motor And center bit, the front end of described center drill rod is connected to screw drill by measurement while drilling pipe nipple Tool, the front end of described helicoid hydraulic motor connects has center bit, described center bit and reaming to overlap it Between be provided with quick-disassembly structure, the front-end edge of described center bit is provided with multiple cutting element.
2. underground coal mine as claimed in claim 1 is with one heart with pipe directional drilling device, its feature It is: use between outer sleeve and casing shoe and be articulated and connected, inner edge, described articulated joint one end Being provided with the hinged groove of arc, one end outer rim is provided with the hinged projection being articulated with in hinged groove, described The outer rim of hinged projection is the segmental arc suitable with hinged groove, thus realizes the most hinged.
3. underground coal mine as claimed in claim 1 is with one heart with pipe directional drilling device, its feature It is: center bit is basically identical with reaming set cutting edge height of protrusion, it is achieved during directional drilling Center bit is consistent with reaming set building force direction.
4. underground coal mine as claimed in claim 1 is with one heart with pipe directional drilling device, its feature Be: described quick-disassembly structure comprise the axial slide being arranged on center bit and rotary chute with And the positioning convex of reaming set inwall, described axial slide radially extends from the front end of center bit To rear portion, described rotary chute is positioned at the middle part of center bit and is communicated in axial slide, described Center bit and expansion is realized in positioning convex chute vertically slips into and is positioned rotary chute Being relatively fixed between borehole jack.
5. the underground coal mine as described in arbitrary in claim 1-4 is with one heart with pipe directional drilling device Construction method, comprise the steps of:
Step one: with pipe directional drilling, connects this BHA and carries out, with pipe directional drilling, boring During entering, helicoid hydraulic motor is driven to rotate by center of rotation drilling rod thus to change helicoid hydraulic motor curved Head towards, external articulation outer tube, joint, casing shoe and reaming set are along with helicoid hydraulic motor elbow court Together change to change, center bit can be changed and reaming is enclosed within the cutting direction at the bottom of hole, Realize directional drilling TRAJECTORY CONTROL;And in outer sleeve together descends hand-hole with drilling tool;
Step 2: propose center drilling tool, when creeping into desired depth, slowly invert centre drill Bar, center bit and reaming set disengage, by center drill rod, measurement while drilling pipe nipple, helicoid hydraulic motor Proposing outside hole with center bit, sleeve pipe plays guard aperture effect in then staying hole;
Step 3: minor diameter directional tool creeps into, enters the screw drill of little one-level diameter from aperture Tool, measure pipe nipple and drill bit proceeds directional drilling construction until projected depth.
CN201610329723.5A 2016-05-18 2016-05-18 Underground coal mine is with one heart with pipe directional drilling device and its construction method Active CN106014258B (en)

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Cited By (9)

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Publication number Priority date Publication date Assignee Title
CN107676043A (en) * 2017-11-02 2018-02-09 成都康叶环保科技有限公司 Casing drilling system and casing drilling method
CN107740677A (en) * 2017-09-22 2018-02-27 中煤科工集团西安研究院有限公司 A kind of broken soft seam concordant directional long borehole gas pumping method for crossing working face
CN110700878A (en) * 2019-10-24 2020-01-17 中煤科工集团西安研究院有限公司 Pumping screw pump drilling tool system for accumulated water in underground drilling hole of coal mine and construction method thereof
CN111270994A (en) * 2020-02-10 2020-06-12 广州海洋地质调查局 Casing running process and device for deep sea riser-free pipe following drilling
CN111764872A (en) * 2020-07-07 2020-10-13 中煤科工集团西安研究院有限公司 Coal mine underground top and bottom plate comb-shaped branch hole pipe flying construction drilling tool and construction method
CN113062693A (en) * 2021-04-14 2021-07-02 太原理工大学 Device and method for extracting gas by penetrating complex stratum through pipe-following protective hole
CN113445931A (en) * 2021-06-29 2021-09-28 山西天地王坡煤业有限公司 Coal seam drilling pipe following drilling device and method
CN114251053A (en) * 2021-12-14 2022-03-29 中国地质科学院勘探技术研究所 Drill bit for casing drilling
CN115229433A (en) * 2022-06-16 2022-10-25 长沙天和钻具机械有限公司 Machining process of concentric casing drilling tool reaming sleeve assembly

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CN103114812A (en) * 2013-03-05 2013-05-22 山东托普森金刚石钻头有限公司 Diamond compact annular concentric simultaneous casing drilling bit and working method thereof
CN104453712A (en) * 2014-12-03 2015-03-25 中煤科工集团西安研究院有限公司 While-drilling sleeve directional drilling device and method for soft coal seams of underground coal mine

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US5033556A (en) * 1989-02-01 1991-07-23 Baker Hughes Incorporated Method and apparatus for horizontal drilling
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CN2849164Y (en) * 2005-11-14 2006-12-20 郑州士奇测控技术有限公司 Near drill during drilling measuring device of well deviation angle
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CN103114812A (en) * 2013-03-05 2013-05-22 山东托普森金刚石钻头有限公司 Diamond compact annular concentric simultaneous casing drilling bit and working method thereof
CN104453712A (en) * 2014-12-03 2015-03-25 中煤科工集团西安研究院有限公司 While-drilling sleeve directional drilling device and method for soft coal seams of underground coal mine

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107740677A (en) * 2017-09-22 2018-02-27 中煤科工集团西安研究院有限公司 A kind of broken soft seam concordant directional long borehole gas pumping method for crossing working face
CN107676043A (en) * 2017-11-02 2018-02-09 成都康叶环保科技有限公司 Casing drilling system and casing drilling method
CN110700878A (en) * 2019-10-24 2020-01-17 中煤科工集团西安研究院有限公司 Pumping screw pump drilling tool system for accumulated water in underground drilling hole of coal mine and construction method thereof
CN110700878B (en) * 2019-10-24 2020-10-27 中煤科工集团西安研究院有限公司 Pumping screw pump drilling tool system for accumulated water in underground drilling hole of coal mine and construction method thereof
CN111270994A (en) * 2020-02-10 2020-06-12 广州海洋地质调查局 Casing running process and device for deep sea riser-free pipe following drilling
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CN113445931B (en) * 2021-06-29 2024-02-06 山西天地王坡煤业有限公司 Along-coal-seam drilling and casing drilling device and casing drilling method
CN114251053A (en) * 2021-12-14 2022-03-29 中国地质科学院勘探技术研究所 Drill bit for casing drilling
CN114251053B (en) * 2021-12-14 2023-09-26 中国地质科学院勘探技术研究所 Drill bit for casing drilling
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