CN103114812A - Diamond compact annular concentric simultaneous casing drilling bit and working method thereof - Google Patents
Diamond compact annular concentric simultaneous casing drilling bit and working method thereof Download PDFInfo
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Abstract
The invention relates to a diamond compact annular concentric simultaneous casing drilling bit. The diamond compact annular concentric simultaneous casing drilling bit comprises a center drilling bit, a casing drilling bit and a casing shoe. The center drilling bit is connected with a drilling rod through a drilling rod connector, and the casing shoe is in threaded connection with a casing pipe. The casing drilling bit and the casing shoe are sleeved on the center drilling bit, and the drilling bit end surface of the casing drilling bit is flush with the drilling bit end of the center drilling bit in a stamping mode. The center drilling bit and the casing drilling bit are in a bonding structure, and the center drilling bit rotates around the axis in a unidirectional and limiting mode in the casing drilling bit. The casing drilling bit and the casing shoe are connected in a relative rotation mode around the axis through a sleeved installation method. According to the diamond compact annular concentric simultaneous casing drilling bit, the advantage of efficient rock breaking is fully used, in the process of efficient rock breaking and pushing of the center drilling bit, the casing drilling bit is also efficiently pushed, stratum pushing can be assisted, besides, the center drilling bit and the wall of a drill hole can be protected, coaxiality of the two-step drilling bits is good, guiding and righting supplement each other, bending of the drill hole can not be caused, efficiency of stratum hole drilling can be improved, and service life of the whole drilling tool can be prolonged.
Description
Technical field
The present invention relates to a kind of diamond compact annular concentric with pipe bit and method of work thereof, belong to the technical field of stratum drilling tool.
Background technology
In the construction of numerous troublesome zone drilling, collapse hole, bury drills are that the constructor often encounters and the problem of headache very, adopt conventional drilling process method to be difficult to guarantee quality and the efficiency of construction of boring.
In order to solve above technical problem, industry has adopted to be advanced technology with pipe bit the stratum drilling tool has been carried out breakthrough improvement, and along with advance the development of technology with pipe bit, the improvement patent of existing parallel follow-up drill bit comprises following four:
(1) Chinese patent CN201851017U discloses a kind of down-the-hole concentric simultaneous casing hole expanding drilling tool, comprise center bit, shoe, snap ring, reaming cover, describedly be installed with described shoe with Guan Yiduan, described shoe center is equipped with described center bit, the first end of described centre drill has the down-the-hole air hammer interface, the other end is installed with described reaming cover, has with described shoe the groove that is complementary outward in described reaming cover, and described snap ring is housed in described groove.
(2) Chinese patent CN2606169 discloses a kind of Homocentric drill with separate drive, this drilling tool is made of impactor piston bar, impactor outer tube, sleeve pipe, lateral pin, the front connector of impactor partition type, casing shoe, jump ring, reaming bit and center bit, impactor partition type front connector bottom contacts with step in casing shoe, and center bit crop ring contacts with step in reaming bit.The utility model is by using novel partition type front connector, replace the original front connector of impactor, when creeping into, the impactor piston bar is with certain frequency hammering center bit, make center bit on one side detritus creep into, on one side the hammering reaming bit and then expand and the hole larger than sleeve pipe external diameter; Meanwhile, drilling rod is passed to impactor partition type front connector bottom with the power that feeds of rig through the impactor outer tube, and the pushing set shoe makes the sleeve pipe retaining wall that synchronously follows up.
(3) Chinese patent CN202520228U discloses a kind of integral type concentric simultaneous casing drilling tool, comprise shoe, annular bit and starter, shoe and annular bit are integrated, the annular bit inboard is provided with key, starter is provided with groove, is connected with groove by key between annular bit and starter.Because shoe and annular bit are integrated, annular bit can be mentioned from the hole with sleeve pipe, and the use that can repeat.
(4) Chinese patent CN102787806A concentric simultaneous casing drilling tool solves existing drilling tool structure complicated, makes and the assembling difficulty, and transmitting torque is little, flimsy problem.guider (1) has the 1st, 2 grooves (22), (21), the 1st, 2 grooves are the relative fan groove that the central angle on guider end face circle consists of, the sidewall of fan groove is the plane or adds planar section for curved sections, the 1st, 2 reaming bits (4), (9) have respectively the 1st, 2 convex shoulders (17), (18), the 1st, 2 convex shoulders are positioned at the different ends of reaming bit, it is projected in reaming bit, the 1st, the torsion pass face of 2 convex shoulders (28), (27) be the plane, this plane coordinates with flat sidewall on the guider groove, when drilling tool turns clockwise, the 1st, 2 convex shoulders all are positioned at the 1st of guider, in the time of in 2 grooves, the 1st, 2 reaming bits consist of diameter less than the concentric circles of sleeve pipe, when the rotation of drilling tool inhour, convex shoulder extends radially out the guider end face, its torsion pass face coordinates with the flat sidewall of guider groove.
The technical deficiency of the above 4 kinds of drilling tool is:
1. above-mentioned 4 kinds of drilling tools all will be equipped with impactor, and rock fracture in dynamic indentation greatly restricted boundary of works area and the environment of engineering, and processing cost is high, complicated operation.
2. drilling tool connects the mode complexity of rig, has caused very large waste.
3. the annular bit in above-mentioned 4 kinds of drilling tools and center bit are all to utilize traditional down-the-hold drill bit production technology manufacturing, and this down-the-hold drill bit drilling efficiency is low, and the life-span is short, and processed complex advances tooth slow, and drilling cost is high.
4. the sleeve pipe of above-mentioned 4 kinds of drilling tools and gumshoe are the connected modes that adopts screw thread, the outer silk of shoe trapezoid buckle, and outer silk intensity is low, easily fracture.
5. above-mentioned 4 kinds of drilling tools are high to the quality requirement standard of drilling tool, in case the drilling tool quality does not pass a test, all can cause frequent accident in the pore-creating process, greatly increased the pore-creating time, and in a single day trundle fracture, at the bottom of reaming bit will drop to the hole.
6. the drill bit of above-mentioned 4 kinds of drilling tools is all to utilize percussion drilling, and sleeve pipe easily is out of shape when hammering, and sleeve pipe will be difficult to realize that the slotted hole section is with pipe.
Summary of the invention
For the deficiencies in the prior art, the invention provides a kind of diamond compact annular concentric with pipe bit.
The present invention also provides the method for work of a kind of above-mentioned diamond compact annular concentric with pipe bit.
Concrete technical scheme of the present invention is as follows:
A kind of diamond compact annular concentric comprises center bit, pipe bit and casing shoe with pipe bit; Described center bit is connected with drilling rod by tool joint, and described casing shoe is connected with casing threads; Be arranged with pipe bit and casing shoe on described center bit, the bit face of described pipe bit and the neat setting of the drill bit of described center bit punching; Described center bit and pipe bit are realized by bonding: center bit in pipe bit around the unidirectional rotation-limited of axle; Described pipe bit and casing shoe relatively rotate connection by the mode of sheathed installation around axle.The advantage of design is herein, described center bit and pipe bit are realized unidirectional rotation-limited by bonding, realized the function by the key transmission torque, when creeping into, described center bit will pass on pipe bit by the torsion pass of center bit key from the driving torque of drilling rod, and then drive pipe bit and rotate, realize that center bit synchronizes rotation and creep into pipe bit.The present invention also has the positioning function of concentrating one's gaze on, and the bonding action of being connected with pipe bit by center bit connects both, is the state of creeping into; Carry when boring, only need counter-rotating drilling rod fixed angle, make no longer bonding of center bit and pipe bit, will both separate, center bit is along with the referred aperture of drilling rod, and casing shoe stays at the bottom of the hole.
Preferred according to the present invention, the bonding structure of described center bit and pipe bit is: be provided with convex key around the circular arc of axle at the inwall of described pipe bit, be provided with the gib key that adapts with described convex key size on described center bit body.The gib key of center bit of the present invention and pipe bit convex key match, when creeping into, pipe bit is set in center bit spill keyway, drilling rod passes to the rotation of center bit forward when creeping into, at the same time, center bit forwards to is combined connection with pipe bit, drive pipe bit after connecting and rotate, and presents the state of creeping into; Carry when boring, make low-angle of center bit counter-rotating, just can will both break away from, pipe bit rotates and lost efficacy, thereby center bit can propose along the pipe bit convex key, at the bottom of pipe bit is stayed the hole.
Preferred according to the present invention, sheathed mounting means between described pipe bit and casing shoe is for adopting matched in clearance: being provided with diameter between described pipe bit and casing shoe is the round and elastic snap ring of 5-8mm, when being seated, snap ring is in the outer circular trough of casing shoe simultaneously, and snap ring top lower surface position-limiting action is connected casing shoe with pipe bit.The advantage of design is herein, be seated in situation, between snap ring and pipe bit, axially and radially all adopting matched in clearance between snap ring and casing shoe, so casing shoe can rotate relative to pipe bit, thereby realize that transfer possesses the ability of bearing load transfer pressure simultaneously, in the time of can also keeping advancing with pipe bit, casing shoe and sleeve pipe do not rotate pipe bit with the center bit rotation.In anti-mode of drawing, pulling force is passed to casing shoe and sleeve pipe extends at the bottom of the hole with the moving sleeve pipe of drilling when the center drill bit.
Preferred according to the present invention, be provided with diamond compact at the drill bit of described center bit and the bit face of pipe bit.
Preferred according to the present invention, described pipe bit and casing shoe are all selected the 35CrMo structural alloy steel.Before assembling, also need according to prior art, the 35CrMo structural alloy steel to be carried out modified, carburizing, quenching, Technology for Heating Processing, to increase toughness and the intensity of pipe bit and casing shoe; When practical application, the drilling tool that drill bit of the present invention has been installed is greatly improved than the intensity tool of traditional drilling tool DZ40.
Preferred according to the present invention, the position that is connected with sleeve pipe at described casing shoe is provided with internal thread, and described internal thread is that circular arc is buckle-shaped.The advantage of design is herein, in order to improve the life-span of casing shoe, compare with pipe bit with tradition, the present invention changes casing shoe the buckle-shaped design of into internal thread circular arc: increase stressed sectional area, main stress will concentrate on the middle part, improve the intensity of bending resistance and tension, extend the shoe life-span, make structure more reasonable, and then avoided the easily defective of fracture of external screw thread.
Preferred according to the present invention, described pipe bit is chipping type bit, comprises drilling bit steel body, is provided with diamond compact in the radial position of described drilling bit steel body, is provided with the hard alloy wear resistance bar in the outer rim of described drilling bit steel body.
Preferred according to the present invention, the drill bit of described center bit is sintering carcass diamond compact bit.The advantage of design is herein, and the present invention adopts sintering carcass diamond compact bit, and its flute profile is distributed with to be beneficial to improves the hole wall gap, the pore-forming rule, advance that tooth is fast, high abrasion, life-span be long, thereby the jam of reduction pipe bit.Find during application experiment, when adopting drill bit of the present invention to carry out Petroleum Production, be conventional alloys drill bit and steel body bit 3-5 times the application life of this drill bit, greatly increased the drilling depth in bad ground.Described center bit adopts the matrix-type diamond compact bit, and structure is that the drill body that supports diamond compact processes through sintering with metal material, steel body and erosion resistant Hardmetal materials (tungsten carbide) powder.The excellent diamonds composite sheet, the preparation sheet is applicable to, the oil bit soldering tech, and is provided with indent keyway and the chip area that consists of the boss of load transfer with pipe bit and consist of the transmission rotation.
Described diamond compact is that the polycrystalline diamond thin layer is adhered to the composite material that is bonded on cemented carbide substrate, claims diamond compact, and code name is PDC.Diamond compact has the high abrasion resistance of dimond synneusis and the high impact properties of carbide alloy concurrently, and diamond layer can remain sharp-cutting edge, thereby soft in oil and geological drilling use to medium ground, and effect is very good.In composite sheet, diamond content is up to 99%; Therefore the diamond layer extreme hardness, abrasion resistance is fabulous.Its Knoop hardness is (65-7) * 104 MPas, and is even higher.Its very thin thickness, general control are in 0.5-1.5 millimeter, and vertically welding-on is on drill bit; Its cutting edge is sharp and be to remain from sharp.Its abrasion resistance is higher 100-150 times than carbide alloy, can match in excellence or beauty with natural diamond.
A kind of as above-mentioned diamond compact annular concentric is followed the method for work of pipe bit, comprises that step is as follows:
(1) described center bit is connected with drilling rod by tool joint, described casing shoe is connected with sleeve pipe by the buckle-shaped screw thread of circular arc;
When (2) creeping into, rig passes to the center bit axial compression on the one hand by drilling rod, drives center bit on the other hand and pipe bit rotates simultaneously, is connected by snap ring between pipe bit and casing shoe; Realize that pipe bit rotates and purpose that casing shoe and sleeve pipe do not rotate;
(3) after sleeve pipe follow-up boring is completed, the counter-rotating drilling rod, make described center bit and pipe bit no longer bonding, realize separating of center bit and pipe bit, drilling rod affects center bit to propose, and described pipe bit is persisted in described boring.
The invention has the advantages that:
1. a kind of diamond compact annular concentric of the present invention takes full advantage of the advantage of efficiency crushing rock with pipe bit; when efficient detritus center bit advances; described pipe bit also efficiently advances; not only can assist the stratum to advance, and protection center bit and borehole wall, the axiality of two-stage drill bit is good; guiding and righting are complemented each other; can not cause hole deviation, improve the efficient of earth-boring, extend the application life of whole drilling tool.
2. a kind of diamond compact annular concentric of the present invention utilizes the rigidity guide effect of pipe bit with pipe bit, has not only efficiently suppressed the bending of earth-boring, guarantees the straightness accuracy of boring, and to earth-boring the time, guarantees the drilling diameter scope.Drilling tool structurally designs with key and comes transmitting torque, mutually from the structure of feedback, has guaranteed to be connected between center bit and guider and has good reliability, and solution is removed the sorrow of button.
3. a kind of diamond compact annular concentric of the present invention is simple in structure with pipe bit, and low cost of manufacture is easy to use.
4. before the present invention assembling, also need according to existing processing mode, the 35CrMo structural alloy steel to be carried out modified, carburizing, quenching, Technology for Heating Processing, to increase toughness and the intensity of pipe bit and casing shoe.When practical application, the drilling tool that drill bit of the present invention is installed is greatly improved than traditional drilling tool DZ40 tool.
5. fractured rock effect of the present invention is better, particularly strengthens the molded cannula drill bit, and the sleeve pipe follow-up smoothly.
6, the pipe bit that adopted of the present invention is a kind of chipping type bit, and cutting teeth has from sharp advantage, be difficult the chip hold down of several drill bits during fractured rock.The area of cut during cutting teeth cutting is larger, is suitable for using together with high-revolving mud motor.It can bear larger lateral load and down-hole accident not occur, and is suitable for directional drilling.
7, the present invention improves the structure of casing shoe screw thread, greatly improved drilling efficiency, the generation of problems such as having avoided fracture of wire, fall to bore, load performance is relatively poor.
Description of drawings
Fig. 1 is that diamond compact annular concentric of the present invention is with the overall structure schematic diagram of pipe bit;
Fig. 2 is that diamond compact annular concentric of the present invention is with the transverse sectional view of pipe bit, the state diagram when center bit and pipe bit bonding;
Fig. 3 is that diamond compact annular concentric of the present invention is with the transverse sectional view of pipe bit, the state diagram when center bit separates with pipe bit;
Fig. 4 is the structural representation of casing shoe internal thread of the present invention;
Fig. 5 is the structural representation of pipe bit end face;
In Fig. 1-5,1, center bit; 2, pipe bit; 2-1, drilling bit steel body; 2-2, hard alloy wear resistance bar; 3, casing shoe; 4, tool joint; 5, convex key; 6, gib key; 7, snap ring; 8, diamond compact; 9, the buckle-shaped internal thread of circular arc.
The specific embodiment
Below in conjunction with embodiment and Figure of description, the present invention is described in detail, but is not limited to this.
As Figure 1-3.
A kind of diamond compact annular concentric comprises center bit 1, pipe bit 2 and casing shoe 3 with pipe bit; Described center bit 1 is connected with drilling rod by tool joint 4, and described casing shoe 3 is connected with casing threads; Be arranged with pipe bit 2 and casing shoe 3 on described center bit 1, the neat setting of drill bit punching of the bit face of described pipe bit 2 and described center bit 1; Described center bit 1 is realized by bonding with pipe bit 2: center bit 1 in pipe bit 2 around the unidirectional rotation-limited of axle; Described pipe bit 2 and casing shoe 3 relatively rotate connection by the mode of sheathed installation around axle.
Described center bit 1 with the bonding structure of pipe bit 2 is: be provided with convex key 5 around the circular arc of axle at the inwall of described pipe bit 2, be provided with the gib key 6 that adapts with described convex key 5 sizes on described center bit body 1.
Sheathed mounting means between described pipe bit 2 and casing shoe 3 is for adopting matched in clearance: being provided with diameter between described pipe bit 2 and casing shoe 3 is the round and elastic snap ring 7 of 5-8mm, when being seated, snap ring 7 is in the outer circular trough of casing shoe 3 simultaneously, and snap ring 7 top lower surface position-limiting action is connected casing shoe 3 connection with pipe bit.
Be provided with diamond compact 8 at the drill bit of described center bit 1 and the bit face of pipe bit 2.
A kind of diamond compact annular concentric with pipe bit, is characterized in that as described in Example 1, and described pipe bit 2 and casing shoe 3 are all selected the 35CrMo structural alloy steel.Before assembling, also need according to prior art, the 35CrMo structural alloy steel to be carried out modified, carburizing, quenching, Technology for Heating Processing, to increase toughness and the intensity of pipe bit and casing shoe; When practical application, the drilling tool that drill bit of the present invention has been installed is greatly improved than the intensity tool of traditional drilling tool DZ40.
As shown in Figure 4.A kind of diamond compact annular concentric with pipe bit, is characterized in that as described in Example 1, and the position that is connected with sleeve pipe 2 at described casing shoe 3 is provided with internal thread 9, and described internal thread is that circular arc is buckle-shaped.
The parameter of the internal thread 9 that described circular arc is buckle-shaped is, left silk, and metric system adds major thread, and the spiral shell square is 10mm.
As shown in Figure 5.A kind of diamond compact annular concentric with pipe bit, is characterized in that as described in Example 1,
Described pipe bit 2 is chipping type bit, comprises drilling bit steel body 2-1, is provided with diamond compact 8 in the radial position of described drilling bit steel body 2-1, is provided with hard alloy wear resistance bar 2-2 in the outer rim of described drilling bit steel body 2-1.The drill bit of described center bit 1 is sintering carcass diamond compact bit.
A kind of as the method for work of diamond compact annular concentric as described in embodiment 3,4 with pipe bit, it is as follows that the method comprising the steps of:
(1) described center bit 1 is connected with drilling rod by tool joint 4, described casing shoe 3 is connected with sleeve pipe by the buckle-shaped screw thread 9 of circular arc;
When (2) creeping into, rig passes to center bit 1 axial compression on the one hand by drilling rod, drives on the other hand center bit 1 and pipe bit 2 and rotates simultaneously, is connected by snap ring 7 between pipe bit 2 and casing shoe 3; Realize pipe bit 2 to rotate and purpose that casing shoe 3 and sleeve pipe do not rotate;
(3) after sleeve pipe follow-up boring is completed, the counter-rotating drilling rod, make described center bit 1 and pipe bit 2 no longer bonding, realize separating of center bit 1 and pipe bit 2, drilling rod affects center bit 1 to propose, and described pipe bit 2 is persisted in described boring.
Adopt the present invention to carry out the stratum when creeping into, adjust Drilling Techno-logical in following scope, it adjusts principle is formation cementation poor (loose), adopting little the pressure of the drill and large pump amount is main rule parameter, bores to meet solid rock relatively to adopt the slow-speed of revolution and large the pressure of the drill be main Drilling Techno-logical: 1, the pressure of the drill 12-22KN adopts larger the pressure of the drill to alleviate violent pressurization, bouncing of drilling tool, shake to the destruction of drilling tool in case of necessity as far as possible.2, rotating speed 80-200r/min.3, pump pressure 200-300L/min.
Claims (9)
1. a diamond compact annular concentric with pipe bit, comprises center bit, pipe bit and casing shoe; Described center bit is connected with drilling rod by tool joint, and described casing shoe is connected with casing threads; Be arranged with pipe bit and casing shoe on described center bit, the bit face of described pipe bit and the neat setting of the drill bit of described center bit punching; It is characterized in that, described center bit and pipe bit are realized by bonding: center bit in pipe bit around the unidirectional rotation-limited of axle; Described pipe bit and casing shoe relatively rotate connection by the mode of sheathed installation around axle.
2. a kind of diamond compact annular concentric according to claim 1 is with pipe bit, it is characterized in that, the bonding structure of described center bit and pipe bit is: be provided with convex key around the circular arc of axle at the inwall of described pipe bit, be provided with the gib key that adapts with described convex key size on described center bit body.
3. a kind of diamond compact annular concentric according to claim 1 is with pipe bit, it is characterized in that, sheathed mounting means between described pipe bit and casing shoe is for adopting matched in clearance: being provided with diameter between described pipe bit and casing shoe is the round and elastic snap ring of 5-8mm, when being seated, snap ring is in the outer circular trough of casing shoe simultaneously, and snap ring top lower surface position-limiting action is connected casing shoe with pipe bit.
4. a kind of diamond compact annular concentric according to claim 1 with pipe bit, is characterized in that, is provided with diamond compact at the drill bit of described center bit and the bit face of pipe bit.
5. a kind of diamond compact annular concentric according to claim 1 with pipe bit, is characterized in that, described pipe bit and casing shoe are all selected the 35CrMo structural alloy steel.
6. a kind of diamond compact annular concentric according to claim 1 with pipe bit, is characterized in that, the position that is connected with sleeve pipe at described casing shoe is provided with internal thread, and described internal thread is that circular arc is buckle-shaped.
7. a kind of diamond compact annular concentric according to claim 1 is with pipe bit, it is characterized in that, described pipe bit is chipping type bit, comprise drilling bit steel body, radial position at described drilling bit steel body is provided with diamond compact, is provided with the hard alloy wear resistance bar in the outer rim of described drilling bit steel body.
8. a kind of diamond compact annular concentric according to claim 1 with pipe bit, is characterized in that, the drill bit of described center bit is sintering carcass diamond compact bit.
One kind as claimed in claim 1 the diamond compact annular concentric with the method for work of pipe bit, it is characterized in that, it is as follows that the method comprising the steps of:
(1) described center bit is connected with drilling rod by tool joint, described casing shoe is connected with sleeve pipe by the buckle-shaped screw thread of circular arc;
When (2) creeping into, rig passes to the center bit axial compression on the one hand by drilling rod, drives center bit on the other hand and pipe bit rotates simultaneously, is connected by snap ring between pipe bit and casing shoe; Realize that pipe bit rotates and purpose that casing shoe and sleeve pipe do not rotate;
(3) after sleeve pipe follow-up boring is completed, the counter-rotating drilling rod, make described center bit and pipe bit no longer bonding, realize separating of center bit and pipe bit, drilling rod affects center bit to propose, and described pipe bit is persisted in described boring.
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| CN104594811A (en) * | 2013-10-31 | 2015-05-06 | 赵兵 | Rock water drilling machine row-hole drill bit |
| CN106014258A (en) * | 2016-05-18 | 2016-10-12 | 中煤科工集团西安研究院有限公司 | Coal mine underground concentric casing directional drilling device and construction method thereof |
| CN112196470A (en) * | 2020-10-09 | 2021-01-08 | 李荟敏 | Rock drilling method and device by impacting and cutting |
| CN113062693A (en) * | 2021-04-14 | 2021-07-02 | 太原理工大学 | Apparatus and method for gas extraction through complex strata with pipe protection holes |
| CN113137190A (en) * | 2021-05-13 | 2021-07-20 | 中信国安建工集团有限公司 | Rotary drilling rig drill rod component and rotary drilling rig |
| CN114382410A (en) * | 2022-01-12 | 2022-04-22 | 焦作煤业（集团）新乡能源有限公司 | Downhole broken stratum hole bottom driving rapid pipe following drilling tool and method for coal mine |
| CN114575752A (en) * | 2022-04-06 | 2022-06-03 | 吉林大学 | Continuous casing drilling tool system with double impregnated diamond drill bits |
| 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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| JP6307979B2 (en) | 2014-03-31 | 2018-04-11 | 三菱マテリアル株式会社 | Drilling tools |
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| CN113137190A (en) * | 2021-05-13 | 2021-07-20 | 中信国安建工集团有限公司 | Rotary drilling rig drill rod component and rotary drilling rig |
| CN114382410A (en) * | 2022-01-12 | 2022-04-22 | 焦作煤业（集团）新乡能源有限公司 | Downhole broken stratum hole bottom driving rapid pipe following drilling tool and method for coal mine |
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| CN117803317A (en) * | 2024-03-01 | 2024-04-02 | 四川中铁二院环保科技有限公司 | Drill bit used in diamond drilling and coring process |
| CN117803317B (en) * | 2024-03-01 | 2024-05-03 | 四川中铁二院环保科技有限公司 | Drill bit used in diamond drilling and coring process |
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