CN113216868B - One-way bending drilling tool and punching, cave-making and coal-drawing method - Google Patents
One-way bending drilling tool and punching, cave-making and coal-drawing method Download PDFInfo
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- CN113216868B CN113216868B CN202110510499.0A CN202110510499A CN113216868B CN 113216868 B CN113216868 B CN 113216868B CN 202110510499 A CN202110510499 A CN 202110510499A CN 113216868 B CN113216868 B CN 113216868B
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B17/00—Drilling rods or pipes; Flexible drill strings; Kellies; Drill collars; Sucker rods; Cables; Casings; Tubings
- E21B17/02—Couplings; joints
- E21B17/04—Couplings; joints between rod or the like and bit or between rod and rod or the like
- E21B17/05—Swivel joints
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B7/00—Special methods or apparatus for drilling
- E21B7/04—Directional drilling
Abstract
The invention relates to a unidirectional bending drilling tool and a punching, cave-making and coal-digging method, wherein the drilling tool comprises a plurality of short sections which are connected in sequence; each short section comprises a seat section, a central channel for liquid to flow is arranged in the seat section, and a moving part, a push block and an elastic part are arranged in the central channel; the movable part is a ring-shaped part integrally and comprises a movable ball head section and a column body section; the inner wall of the seat joint comprises a spherical groove section and a variable cross-section, the spherical groove section is matched with the spherical surface of the movable ball head section, the variable cross-section is provided with a section of inclined surface along the circumferential direction of the variable cross-section, and a gradually changed gap is formed between the inclined surface and the outer wall of the cylinder section; the inner wall of the seat section is provided with an orifice for the push block to move back and forth along the radial direction, and the inner wall of the seat section is provided with a communicating hole for communicating the pressure cavity with the central channel. The drilling tool can realize unidirectional bending; the drilling tool can radially draw coal in the through hole, increase the coal output of a single through hole, enlarge the pressure relief range of the single through hole, improve the extraction benefit and reduce the engineering quantity of the through hole.
Description
Technical Field
The invention belongs to the technical field of underground gas extraction of coal mines, and particularly relates to a one-way bending drilling tool and a punching and cave-making coal digging method.
Background
The underground drilling implementation gas pre-extraction is a basic method for controlling mine hole gas in China at present, a cross-layer drilling gas extraction technology based on a bottom suction roadway is one of main means for extracting gas of a high-gas and low-gas-permeability outburst coal seam, a hydraulic punching technology based on the cross-layer drilling can effectively reduce the gas extraction cost, improve the drainage efficiency, ensure the safe production of a working face, and is widely applied to soft and low-permeability coal seam development areas. At present, a conventional drilling tool is mainly combined with a hydraulic punching tool to punch and pit a coal seam section drilled in a cross-layer mode, the punching section is controlled by a rigid drilling tool, the hydraulic jet effective range is small, only coal near the axis of an eyelet can be fished out, and the single-hole pressure relief range is limited.
A method which is not limited to punching only near the axis of a hole is urgently needed to increase the coal output of a single hole of a cross-layer hole, enlarge the pressure relief range and improve the extraction benefit of the cross-layer hole.
Disclosure of Invention
Aiming at the defects in the prior art, the invention provides a one-way bending drilling tool and a punching, hole-making and coal-digging method, and solves the problems that the existing hydraulic punching drilling tool is small in water conservancy spraying range and limited in single-hole pressure relief range.
Therefore, the invention is realized by adopting the following technical scheme:
a unidirectional bending drilling tool comprises a plurality of short sections which are connected in sequence; each short section comprises a seat section, a central channel for liquid to flow is arranged in the seat section, and a moving part, a push block and an elastic part are arranged in the central channel;
the movable part is a ring-shaped part integrally, and comprises a movable ball head section and a column body section; the inner wall of the seat joint comprises a spherical groove section and a variable cross-section, and the spherical groove section is matched with the spherical surface of the movable ball head section; the variable cross-section is provided with a section of inclined surface along the circumferential direction of the variable cross-section, a gradual change gap is formed between the inclined surface and the outer wall of the cylinder section, and the gap is gradually increased from the edge of the spherical groove to the end part of the seat joint; a pin shaft used for limiting the moving part to move axially along the central channel is arranged on the spherical surface of the movable ball head section, and a pin shaft hole matched with the pin shaft is arranged in the spherical groove section;
an orifice for the push block to move back and forth along the radial direction is formed in the inner wall of the seat joint, the bottom of the orifice is connected with the push block through the elastic part, a pressure cavity is formed between the bottom of the orifice and the push block, and a communication hole for communicating the pressure cavity with the central channel is formed in the inner wall of the seat joint; the push block is positioned on the opposite side of the inclined surface.
Preferably, the inner wall of the seat section is provided with a locking ring and a fixing ring, and the locking ring and the fixing ring are sequentially sleeved on the moving part along the axial direction; one part of the inner wall of the locking ring is arranged to be an arc-shaped surface, and the other part of the inner wall is provided with a section of first inclined surface along the circumferential direction; a dome is arranged on the inner wall of the seat section, and when the locking ring is assembled in the seat section, the arc-shaped surface on the locking ring and the dome form the spherical groove section together;
the outer wall of the fixing ring is connected with the inner wall of the seat section, a section of second inclined surface is arranged on the inner wall of the fixing ring along the circumferential direction, and the first inclined surface and the second inclined surface form the inclined surface together; the fixed ring is provided with a through hole for the push block to pass through, and the through hole corresponds to the position of the hole opening in the inner wall of the seat section.
Preferably, the edge of the arc-shaped surface of the locking ring is provided with a half pin shaft hole, the edge of the spherical groove is provided with a half pin shaft hole, and the two half pin shaft holes form a complete pin shaft hole after the locking ring and the movable piece are assembled.
Preferably, the fixing ring is fixed on the seat section through a positioning pin.
Preferably, the outer wall of the fixing ring is connected with the inner wall of the seat section through threads.
Preferably, a sealing ring is arranged on a contact surface between the spherical surface of the movable ball head section and the spherical groove section.
Preferably, a sealing ring is arranged at the contact surface of the push block and the side wall of the orifice.
Preferably, the tail end of the cylinder body section is provided with a male connector, and the seat section is provided with a female connector matched with the male connector.
Based on the unidirectional bending drilling tool, the invention also discloses a punching, cave-making and coal-drawing method, which specifically comprises the following steps:
and 3, when the punching and coal drawing in one direction is finished, withdrawing the one-way bending drilling tool, and repeating the step 2 until all the punching and coal drawing processes along the radial direction of the main hole are finished.
Compared with the prior art, the invention has the beneficial effects that:
the drilling tool can realize unidirectional bending; the drilling tool can radially draw coal in the through hole, increase the coal output of a single through hole, enlarge the pressure relief range of the single through hole, improve the extraction benefit and reduce the engineering quantity of the through hole.
Additional features and advantages of the invention will be set forth in the detailed description which follows.
Drawings
Fig. 1 is an overall front view of a unidirectional bending drill according to an embodiment of the present invention.
Fig. 2 is another front view of the unidirectional bending drill according to one embodiment of the present invention.
FIG. 3 is a schematic view of a one-way bend tool joint according to one embodiment of the present invention.
FIG. 4 is a schematic view of a one-way bend tool joint according to another embodiment of the present invention.
FIG. 5 is an isometric view of a seating section according to an embodiment.
Fig. 6 is an isometric view of a locking ring according to an embodiment.
Fig. 7 is a front sectional view of the lock ring according to the embodiment.
Fig. 8 is a sectional view taken along line a-a of fig. 7.
Fig. 9 is a front sectional view of the fixing ring according to the embodiment.
Fig. 10 is a sectional view taken along line B-B of fig. 9.
FIG. 11 is an isometric view of the moveable member of the example.
Figure 12 is an isometric view of the moveable member of the present embodiment with a locking ring and a retaining ring disposed about the moveable member.
Fig. 13 is a schematic view of the overall structure of the one-way bending drill according to the embodiment.
FIG. 14 is a flow chart of the punching, hole making and coal drawing according to the embodiment.
The various reference numbers in the figures illustrate:
1-seat section, 2-moving part, 3-push block, 4-elastic part, 5-locking ring, 6-fixing ring, 7-positioning pin, 8-sealing ring, 9-main hole and 10-coal bed;
11-central channel, 12-movable ball head section, 13-variable section, 14-gap, 15-orifice, 16-pressure chamber, 17-communicating hole, 18-dome and 19-female joint;
121-pin hole; 131-inclined plane;
21-movable ball head section, 22-cylinder section and 23-channel; 211-pin shaft; 221-male connector;
51-arc surface, 52-first inclined surface; 61-second inclined surface.
The invention is explained in more detail below with reference to the drawings and the description of the preferred embodiments.
Detailed Description
The invention relates to a method for punching, cave-making and coal-drawing, which utilizes sprayed water jet flow to punch coal and methane in a protruded coal bed or induce controllable small protrusion to cause pressure relief of coal bodies and eliminate the danger of coal bed protrusion.
Specific embodiments of the present invention are described below, and it should be noted that, in the present invention, unless otherwise specified, terms of orientation such as "upper, lower, bottom, and top" are generally defined with reference to the drawing plane of the corresponding drawing, and "inner and outer" are defined with reference to the outline of the corresponding drawing.
In the description of the present invention, unless otherwise explicitly specified or limited, the terms "disposed" and "connected" are to be understood broadly, and may be, for example, fixedly connected or detachably connected or integrated; either a direct connection or an indirect connection, and the like. The specific meaning of the above terms in the present technical solution can be understood by those of ordinary skill in the art according to specific situations.
The present invention is not limited to the following embodiments, and various specific technical features described in the following embodiments may be combined in any suitable manner without contradiction as long as they do not depart from the gist of the present invention, and should also be regarded as being disclosed in the present invention.
Example 1
The embodiment discloses a one-way bending drilling tool which is formed by sequentially connecting a plurality of short sections. As shown in fig. 1, each short section at least comprises a seat section 1, a movable member 2, a push block 3 and an elastic member 4, a central channel 11 for liquid to flow is arranged in the seat section 1 and serves as an injection channel, and the movable member 2, the push block 3 and the elastic member 4 are arranged in the central channel 11.
The movable element 2 is an annular element in its entirety, in which a channel 23 is provided for the passage of injection-pressure liquid, and the movable element 2 comprises a movable ball segment 21 and a cylinder segment 22, as shown in fig. 10.
The inner wall of the seat joint 1 comprises a spherical groove section 12 and a variable cross-section 13, as shown in fig. 3, the spherical groove section 12 is matched with the spherical surface of the movable ball head section 21; the variable cross-section 13 includes a constant cross-section having a constant thickness as shown in the upper half of the cross-section in fig. 3, and an inclined surface section having an equal thickness in the same radial direction and gradually changing in different radial thicknesses, and the inclined surface section is provided with an inclined surface 131 as shown in the lower half of the cross-section in fig. 3. When the movable element 2 is assembled in the seat section 1, a gradual gap 14 is formed between the inclined surface 131 and the outer wall of the cylinder section 22, the gap 14 gradually increases from the edge of the spherical groove to the end of the seat section 1, as shown in fig. 1, the gap 14 forms a movable gap of the movable element, and the movable element 2 moves to the gap under the thrust action of the push block 3 and the elastic element 4.
The spherical surface of the movable spherical head section 21 is provided with a pin 211 for limiting the axial movement of the movable element 2 along the central passage 11, as shown in fig. 2 and 11. The spherical groove section 12 is provided with a pin shaft hole 121 matched with the pin shaft 211, as shown in fig. 2, the position of the pin shaft 211 enables the movable element 2 to rotate only in the direction of the gap 14 around the axial direction of the pin shaft 211, and specifically, the rotation is realized by adjusting the position of the inclined surface 131.
An orifice 15 for the push block 3 to move back and forth along the radial direction is arranged on the inner wall of the seat section 1, the bottom of the orifice 15 is connected with the push block 3 through an elastic part 4, and the elastic part 4 is a spring. A pressure cavity 16 is arranged between the bottom of the orifice 15 and the push block 3, a communication hole 17 for communicating the pressure cavity 16 and the central channel 11 is arranged on the inner wall of the seat joint 1, and the communication hole 17 extends from the pressure cavity 16 to the central channel 11 outside the movable body 2. It should be noted that the push block 3 is located at the opposite side of the inclined surface 131, so that the movable member 2 can move to the gap under the thrust action of the push block 3 and the elastic member 4, and the short joint is bent as a whole.
As a preferred example of this embodiment, in order to achieve assemblability, a locking ring 5 and a fixing ring 6 are fitted on the inner wall of the boss 1, and as shown in fig. 4, the locking ring 5 and the fixing ring 6 are fitted in turn axially over the movable member 2. Wherein, a part of the inner wall of the locking ring 5 is provided with an arc-shaped surface 51, and the other part of the inner wall is provided with a section of first inclined surface 52 along the circumferential direction, as shown in fig. 6 and 7, the outer contour of the locking ring 5 of the present embodiment is circular, and the inner contour is elliptical, as shown in fig. 8. The body section 22 of the moving part 2 of the present embodiment is cylindrical and the minor axis length of the elliptical profile inside the locking ring 5 matches the outer diameter of the cylindrical section 22. The inner wall of the seat section 1 is provided with a dome 18. as shown in figures 4 and 5, the arcuate surface 51 on the locking ring 5 and the dome 18 together form the spherical groove section 12 when the locking ring 5 is fitted within the seat section 1.
The outer wall of the fixed ring 6 is connected with the inner wall of the seat section 1, and the fixed ring is connected with the inner wall of the seat section by screw threads in the embodiment. A section of second inclined surface 61 is arranged on the inner wall of the fixing ring 6 along the circumferential direction, as shown in fig. 9; the highest position of the second inclined surface 61 is equal to the lowest position of the first inclined surface 52, so that the first inclined surface 52 smoothly transits to the second inclined surface 61, and the two assembled form an inclined surface 131. The outer contour of the fixing ring 6 is circular and the inner wall contour is also elliptical, as shown in fig. 10, the minor axis length of the inner elliptical contour of the fixing ring 6 matches the outer diameter of the cylinder section 22 of the moving part, and the locking ring 5 and the major axis direction of the inner elliptical contour of the fixing ring 6 form the moving gap 14 of the moving head.
In addition, the fixing ring 6 is provided with a through hole for the push block 3 to pass through, in this embodiment, a notch is formed downwards along the axial direction from the end of the fixing ring 6, the push block 3 can be clamped into the notch, the fixing ring 6 is cylindrical, the notch is a corresponding circular hole, and the position of the notch corresponds to the position of the orifice 15 on the inner wall of the seat joint 1.
Preferably, in the above assembling structure, a half pin shaft hole a is provided at the edge of the arc-shaped surface 51 of the locking ring 5, a half pin shaft hole b is provided at the edge of the spherical groove, and after the locking ring 5 is assembled with the movable member 2, the two half pin shaft holes form a complete pin shaft hole 121, so that the position of the locking ring 5 is fixed and prevented from rotating axially. Meanwhile, a positioning pin 7 is inserted between the seat section 1 and the fixing ring 6, and the fixing ring 6 is fixed on the seat section 1 through the positioning pin 7, so that the second inclined surface 61 on the fixing ring 6 is ensured to be consistent with the first inclined surface 52 on the locking ring 5 in direction.
In the embodiment, the locking ring 5 and the fixing ring 6 are arranged to jointly form a part of the inner wall of the seat section 1, so that the assembly of each part and the adjustment of the inclination direction are facilitated. During assembly, firstly, the moving part 2 is processed and arranged in the seat joint 1, the spherical body of the moving part 2 is matched with the spherical groove in the seat joint 1, the pin shafts 211 on two sides of the moving part 2 are arranged in the pin shaft hole b of the seat joint 1, then the locking ring 5 is sleeved on the upper part of the moving part 2, the pin shaft hole a and the pin shaft hole b on the locking ring 5 are fastened together with the pin shaft 211, then the push block 3 and the elastic part 4 are arranged, and then the fixing ring 6 is arranged, the fixing ring 6 is connected on the inner wall of the seat joint 1 through threads and abuts against the locking ring 5, meanwhile, the notch on the fixing ring 6 is matched with the push block 3, the positioning pin 7 is inserted for positioning, and the push block 3 can move in the reserved hole of the fixing ring 7 after positioning and installation.
In order to ensure that liquid under pressure enters between the movable body 2 and the seat joint 1, a sealing ring 8 is arranged on the contact surface of the spherical surface of the movable ball head section 21 and the spherical groove section 12. Meanwhile, a sealing ring (marked in the figure) is arranged at the contact surface of the push block 3 and the side wall of the orifice 15, so that the tightness of the pressure cavity 16 is ensured.
The short sections can be connected through the screw threads of the male head and the female head and locked by the positioning pins so as to ensure that all bending directions are consistent, and the short sections can also be connected in a plug-in mode. In this embodiment, a threaded connection is adopted, specifically, a male joint 221 is arranged at the tail end of the cylinder section 22, a female joint 19 matched with the male joint 221 is arranged on the seat section 1, and the male joint 221 is connected with the female joint 19 of the next short section. The female connector 19 may be provided with a positioning hole for fixing the axial position of the two connected short circuits.
The external shape outline of the seat joint 1 of the embodiment is cylindrical, one part of the inner wall of the seat joint 1 is used for arranging female joint threads, and the other part of the inner wall of the seat joint 1 is used for installing moving parts and the like.
After the whole drilling tool of the embodiment is connected, as shown in fig. 13, the drilling tool functions according to the following principle: under the action of the elastic element 4, the push block 3 extends out to push the movable element 2 to bend towards one side, and the drilling tool is in a curve shape, and the small elastic element 4 can be replaced to enable the drilling tool to be in a straight line shape. After the drilling tool enters the drilled hole, the drilling tool offsets the elastic force of the elastic element 4 under the support of the hole wall, so that the drilling tool is nearly linear and can continuously enter the drilled hole, when the drill bit/spray head contacts the hole bottom, the drill bit/spray head points to one side of the hole bottom under the action of the elastic force of the spring, hydraulic pressure is applied, liquid is added into the pressure cavity 16 through the communicating hole 17, the push block 3 extends out under the action of hydraulic force to apply thrust to the moving element 2, and the drill bit/spray head is always sprayed to one side of the hole bottom under the dual action of the spring and the hydraulic force.
Example 2
The embodiment provides a method for punching, cave-making and coal-drawing, which adopts the unidirectional bending drilling tool described in embodiment 1 to punch and draw coal along the radial direction of a main hole, and the flow is shown in fig. 14, and comprises the following steps:
and 3, when the punching and coal drawing in one direction is finished, withdrawing the one-way bending drilling tool, and repeating the step 2 until all the punching and coal drawing processes along the radial direction of the main hole are finished.
Example 3
The extraction area given in this example is 12m × 12m, the rock pore section is 50m, and the coal thickness is 3 m. Taking the conventional perforation distance of 3m multiplied by 3m in domestic drainage as an example, 16 holes are required to be distributed, the total footage of the rock hole section is 800m, and the footage of the coal hole section is 48 m. By adopting the invention, 8 branches of punching holes are punched in each layer-through hole, only 4 holes need to be distributed, the total footage of the rock hole section is 200m, and the total footage of the coal hole section is 144 m, thus greatly reducing the engineering quantity, saving drilling tools, reducing the working difficulty, and analyzing the engineering quantity of two schemes as shown in Table 1.
TABLE 1 comparison of the engineering quantities of the present invention and conventional technology
Claims (9)
1. A unidirectional bending drilling tool is characterized by comprising a plurality of short sections which are connected in sequence; each short section comprises a seat section (1), a central channel (11) for liquid to flow is arranged in the seat section (1), and a moving part (2), a push block (3) and an elastic part (4) are arranged in the central channel (11);
the whole movable piece (2) is a ring-shaped piece, and the movable piece (2) comprises a movable ball head section (21) and a column body section (22);
the inner wall of the seat joint (1) comprises a spherical groove section (12) and a variable cross-section (13), and the spherical groove section (12) is matched with the spherical surface of the movable ball head section (21); the variable cross-section (13) is provided with a section of inclined surface (131) along the circumferential direction of the variable cross-section, a gradual change gap (14) is formed between the inclined surface (131) and the outer wall of the column body section (22), and the gap (14) is gradually increased from the edge of the spherical groove to the end part of the seat joint (1);
a pin shaft (211) used for limiting the moving piece (2) to move axially along the central channel (11) is arranged on the spherical surface of the movable ball head section (21), and a pin shaft hole (121) matched with the pin shaft (211) is arranged in the spherical groove section (12);
an orifice (15) for the push block (3) to move back and forth along the radial direction is formed in the inner wall of the seat joint (1), the bottom of the orifice (15) is connected with the push block (3) through the elastic piece (4), a pressure cavity (16) is formed between the bottom of the orifice (15) and the push block (3), and a communication hole (17) for communicating the pressure cavity (16) with the central channel (11) is formed in the inner wall of the seat joint (1); the push block (3) is positioned on the opposite side of the inclined surface (131);
the push block (3) applies thrust to the movable piece (2) under the hydraulic action of the pressure chamber (16), and the movable piece (2) bends towards one side of the inclined surface (131) in a single direction.
2. A unidirectional bending drilling tool as claimed in claim 1, characterized in that a locking ring (5) and a fixing ring (6) are fitted on the inner wall of the holder (1), the locking ring (5) and the fixing ring (6) in turn being fitted axially over the movable member (2); one part of the inner wall of the locking ring (5) is provided with an arc-shaped surface (51), and the other part of the inner wall is provided with a section of first inclined surface (52) along the circumferential direction; a dome (18) is arranged on the inner wall of the seat section (1), and an arc-shaped surface (51) on the locking ring (5) and the dome (18) form the spherical groove section (12) together when the locking ring (5) is assembled in the seat section (1);
the outer wall of the fixing ring (6) is connected with the inner wall of the seat section (1), a section of second inclined surface (61) is arranged on the inner wall of the fixing ring (6) along the circumferential direction, and the first inclined surface (52) and the second inclined surface (61) jointly form the inclined surface (131); the fixed ring (6) is provided with a through hole for the push block (3) to pass through, and the through hole corresponds to the position of the orifice (15) on the inner wall of the seat joint (1).
3. The unidirectional bending drill according to claim 2, characterized in that a half pin hole is arranged at the edge of the arc-shaped surface (51) of the locking ring (5), a half pin hole is arranged at the edge of the spherical groove, and the two half pin holes form a complete pin hole (121) after the locking ring (5) and the movable member (2) are assembled.
4. Unidirectional bending drill according to claim 2, characterized in that the fixing ring (6) is fixed to the holder (1) by means of a positioning pin (7).
5. One-way bending drill according to claim 2, characterized in that the outer wall of the fixing ring (6) is screwed to the inner wall of the holder (1).
6. A unidirectional bending drill according to claim 1, characterized in that the contact surface of the spherical surface of the movable ball head section (21) and the spherical groove section (12) is provided with a sealing ring (8).
7. Unidirectional bending drill according to claim 1, wherein a sealing ring is provided at the contact surface of the push block (3) with the side wall of the aperture (15).
8. Unidirectional bending drill according to claim 1, characterized in that the cylinder section (22) is provided with a male connector (221) at the end and the socket joint (1) is provided with a female connector (19) matching the male connector (221).
9. A punching hole-making coal-digging method is characterized by comprising the following steps:
step 1, constructing a main hole, and putting the one-way bending drilling tool as claimed in any one of claims 1 to 8 into the main hole after a coal seam is seen;
step 2, after the head of the one-way bending drilling tool contacts the bottom of the main hole, a slurry pump is started to inject pressure into the central channel (11), the pushing block (3) applies thrust to the moving part (2) under the action of hydraulic force, the moving part (2) bends towards one side, and finally the whole one-way bending drilling tool is bent in one way; then hydraulic jet drilling or punching drilling is carried out, the hole continuously extends along the bending direction of the drilling tool, and coal is taken out along the radial punching of the main hole;
and 3, when the punching and coal drawing in one direction is finished, withdrawing the one-way bending drilling tool, and repeating the step 2 until all the punching and coal drawing processes along the radial direction of the main hole are finished.
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| CN202110510499.0A CN113216868B (en) | 2021-05-11 | 2021-05-11 | One-way bending drilling tool and punching, cave-making and coal-drawing method |
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| CN202110510499.0A CN113216868B (en) | 2021-05-11 | 2021-05-11 | One-way bending drilling tool and punching, cave-making and coal-drawing method |
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| CN114016910B (en) * | 2021-10-19 | 2024-02-13 | 中煤科工集团西安研究院有限公司 | Elastic bending joint directional underground coal mine directional drilling device and method |
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| CN113216868A (en) | 2021-08-06 |
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