CN110953017B - Device and method for preventing gas extraction borehole from collapsing - Google Patents

Device and method for preventing gas extraction borehole from collapsing Download PDF

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Publication number
CN110953017B
CN110953017B CN202010035329.7A CN202010035329A CN110953017B CN 110953017 B CN110953017 B CN 110953017B CN 202010035329 A CN202010035329 A CN 202010035329A CN 110953017 B CN110953017 B CN 110953017B
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China
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guniting
slurry
drill rod
drill
hole
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CN110953017A (en
Inventor
陈冬冬
谢生荣
陈平
吴晓宇
何文瑞
纪春伟
王恩
孙耀辉
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China University of Mining and Technology Beijing CUMTB
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China University of Mining and Technology Beijing CUMTB
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    • EFIXED CONSTRUCTIONS
    • E21EARTH DRILLING; MINING
    • E21FSAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, OR DRAINING IN OR OF MINES OR TUNNELS
    • E21F7/00Methods or devices for drawing- off gases with or without subsequent use of the gas for any purpose
    • EFIXED CONSTRUCTIONS
    • E21EARTH DRILLING; MINING
    • E21BEARTH DRILLING, e.g. DEEP 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
    • EFIXED CONSTRUCTIONS
    • E21EARTH DRILLING; MINING
    • E21BEARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B33/00Sealing or packing boreholes or wells
    • E21B33/10Sealing or packing boreholes or wells in the borehole
    • E21B33/13Methods or devices for cementing, for plugging holes, crevices, or the like

Abstract

The invention relates to a device and a method for preventing a gas extraction drill hole from collapsing, wherein the device comprises a guniting drill rod and a special drill rod, the guniting drill rod is in threaded connection with the special drill rod, and the bottom of the guniting drill rod is connected with a drill bit; an accelerator passage, a slurry passage and a water passage are arranged in the special drill rod; the guniting drill rod is a hollow drill rod, and a guniting pipeline system is arranged in the guniting drill rod; the upper end of the guniting pipeline system is provided with an accelerator pipeline and a slurry pipeline which are respectively connected with an accelerator channel and a slurry channel under the threaded connection of a guniting drill rod and a specially-made drill rod; the accelerator pipeline and the slurry pipeline are converged through a Y-shaped pipeline and then mixed with slurry through a spiral pipeline; the mixed slurry is finally sprayed out from the inverted T-shaped pipeline through the annular slurry spraying ring. The slurry-spraying drill rod disclosed by the invention sprays slurry to the wall of the drilled hole through the drill rod to form a circular thin cylindrical shell or a fan-shaped thin cylindrical shell, can effectively prevent large-area hole collapse of a gas extraction drilled hole in time, and has great significance for smoothly extracting gas.

Description

Device and method for preventing gas extraction borehole from collapsing
Technical Field
The invention belongs to the field of coal mine gas extraction drill hole construction, and particularly relates to a device and a method for preventing a gas extraction drill hole from collapsing.
Background
At present, the most common method for gas extraction in China is to construct long-distance extraction drilled holes to pre-extract coal bed gas in advance, stress concentration must occur around the drilled holes under the action of ground stress, and the drilled holes are continuously subjected to large deformation and even completely closed in a large range to greatly reduce the gas extraction amount under the condition that the drilled holes are not supported and when the coal bed strength is low or the drilled holes are used for a long time; when extraction drill holes are arranged in an extremely soft and broken coal seam, large-area hole collapse is easily caused in the process that a drill rod exits the drill holes, the gas extraction effect is obviously reduced, and the coal safety recovery is seriously influenced. The traditional method for dealing with hole collapse mainly comprises the following steps: firstly, filling materials with different particle sizes are placed in a long-distance extraction drill hole to support the drill hole, and even if the hole is collapsed, gas can be discharged through gaps of the filling materials, but the method has the defects of low efficiency and the following defects that the hole wall of the drill hole is easy to disturb in the process of placing the filling materials, the hole is collapsed, so that the filling materials cannot be smoothly placed in the whole extraction drill hole, and the traditional method cannot be adopted before the filling materials are placed, even the hole is collapsed in the process of pulling out the drill hole; and secondly, the anti-collapse hole pipe is placed in the extraction drill hole, the method is low in efficiency, the method can be implemented after the drill hole is completely pulled out, and the method is greatly limited or even cannot be used in the coal seam which is soft in strength and easy to collapse. Therefore, the method for preventing the gas extraction drill hole collapse is convenient and quick to use and has great significance for remarkably improving the gas extraction efficiency and guaranteeing the safety stoping of the mine, and the method is suitable for various complicated coal seam conditions.
Disclosure of Invention
The invention aims to solve the technical and method problems of the prior art that the gas extraction efficiency is obviously influenced by preventing the gas extraction drill hole from collapsing, and provides a device and a method for preventing the gas extraction drill hole from collapsing.
In order to achieve the above purpose of the present invention, the technical solutions are provided as follows: a device for preventing a gas extraction drilled hole from collapsing comprises a guniting drill rod and a special drill rod; the guniting drill rod is in threaded connection with the special drill rod, and the bottom of the guniting drill rod is connected with the drill bit; an accelerator passage, a slurry passage and a water passage are arranged in the special drill rod; the guniting drill rod is a hollow drill rod, and a guniting pipeline system is arranged in the guniting drill rod; the guniting pipeline system comprises an accelerator pipeline, a slurry pipeline and an annular guniting ring; when the guniting drill rod is connected with the special drill rod, the accelerator channel and the slurry channel of the special drill rod are respectively communicated with the accelerator pipeline and the slurry pipeline of the guniting drill rod; one end of the accelerator pipeline and one end of the slurry pipeline are converged into a mixed pipeline and then connected with the annular guniting ring, and the annular guniting ring is provided with a guniting port; the water channel supplies water for the drill bit.
The pipe diameters of the accelerator passage, the slurry passage and the water passage are different, the pipe diameter of the water passage is the largest, the slurry passage is the second, and the pipe diameter of the accelerator passage is the smallest.
The quick-setting admixture pipeline and the slurry pipeline are converged to form a Y-shaped pipeline, a main pipe of the Y-shaped pipeline is connected with a spiral pipe, the other end of the spiral pipe is connected with an inverted T-shaped pipeline, and two ends of a transverse pipe of the inverted T-shaped pipeline are connected with the annular slurry spraying ring.
The spiral inside of the spiral pipe is provided with triangular solid inverted teeth, so that the slurry is fully mixed with the accelerating agent, and the mixed slurry sprayed out from the slurry spraying port can be rapidly solidified.
The accelerating agent is a high-strength accelerating agent, and after being fully mixed with the slurry and sprayed to the wall of the drilled hole, the slurry is accelerated to solidify; and polyester fiber materials are added into the slurry to enhance the deformation resistance of the guniting layer.
The annular guniting ring is positioned at the position of 100-300mm at the bottom of the guniting drill rod, and a plurality of guniting ports are arranged on the guniting ring; or a guniting ring is disposed on the drill bit.
The arrangement mode of the guniting ports of the annular guniting ring comprises a circular guniting structure with a whole circle of guniting ports arranged around the guniting ring, or a fan-shaped guniting structure with a part of guniting ports arranged around the guniting ring, the range without the guniting ports on the guniting ring is the range without guniting, and the angle theta of the range without guniting is 0-270 degrees; according to the range of the non-guniting theta, a circular thin column shell or a fan-shaped thin column shell can be formed, wherein the circular thin column shell is formed when the theta =0 DEG, and the fan-shaped thin column shell is formed when the theta is not equal to 0 deg.
The density degree of whitewashing mouth set up to multiple form, the density degree of whitewashing mouth differs, the density degree is used for controlling the thickness of whitewashing, the whitewashing mouth is denser, the thickness of whitewashing is thicker more: wherein, the whitewashing mouth arrangement mode of ring shape whitewashing structure does: the first mode is that the density degree of the guniting ports is consistent, and a round thin cylindrical shell with the same thickness is formed after guniting; the upper part of the guniting port is consistent in density degree, the lower part of the guniting port is sparse, the corresponding angle of the sparse range is 45-180 degrees, and after guniting, a circular thin cylindrical shell with thickened upper part and non-thickened lower part can be formed; the third mode is that the guniting port becomes sparse gradually from the upper part to the lower part, and a circular thin column shell with gradually changed thickness is formed after guniting; the arrangement mode of the guniting ports of the fan-shaped guniting structure is as follows: the method is characterized in that the guniting port is positioned at the upper part, the corresponding angle of the range without the guniting port is 0-180 degrees, the density degree of the guniting port is consistent, and a fan-shaped thin cylindrical shell with the same thickness is formed after guniting; the method is characterized in that a guniting port is positioned at the upper part, the corresponding angle of the range without the guniting port is 0-180 degrees, the guniting port gradually becomes sparse from the upper part to the lower part, and a fan-shaped thin cylindrical shell with gradually changed thickness is formed after guniting; and in the sixth mode, the slurry spraying ports are positioned at the upper part, the corresponding angles of the arrangement range are 180-270 degrees, the density degrees of the slurry spraying ports are consistent, and the top fan-shaped thin cylindrical shell is formed after slurry spraying.
A method for preventing gas extraction borehole collapse comprises the following steps:
step 1) installing a drilling machine and a drill rod, connecting a guniting drill rod of the gas extraction drilling hole collapse prevention device with a special drill rod, connecting the other end of the guniting drill rod with a drill bit, connecting the other end of the special drill rod with the drilling machine, and performing drilling operation after the device is installed;
step 2) when the drilled hole reaches a preset distance, stopping drilling, starting retreating type slurry spraying, and finally spraying the slurry and the accelerator to the hole wall of the drilled hole through an annular slurry spraying ring under a pipeline system to form a circular thin column shell or a fan-shaped thin column shell reinforced hole wall;
step 3) different guniting effects are achieved according to different guniting modes and different guniting drill rods:
3.1) adopt ring shape whitewashing structure to carry out the whitewashing, there are two kinds of whitewashing modes:
the first mode is as follows: when the length of the first circular thin column shell reaches the design distance A, stopping conveying the slurry, and after the drill rod returns backwards for a certain distance B, conveying the slurry again for spraying to form a second circular thin column shell, wherein the length of the second circular thin column shell is also A;
the second mode is as follows: and when the length of the first circular thin column shell reaches the designed distance A, stopping conveying the slurry, and after the drill rod returns backwards for a certain distance B, conveying the slurry again for spraying to form a second circular thin column shell, wherein the length of the second circular thin column shell is C, and C is greater than A.
3.2) when a four-way or five-way guniting drill rod of a fan-shaped guniting structure is adopted, two guniting ways are respectively adopted;
a first mode; when the length of the first fan-shaped thin column shell reaches a designed distance A, stopping conveying the slurry, and after the drill rod returns backwards for a certain distance B, conveying the slurry again for spraying to form a second fan-shaped thin column shell, wherein the length of the second fan-shaped thin column shell is C, and C is greater than A;
the second mode is as follows: when the length of the first fan-shaped thin column shell reaches a designed distance A, stopping conveying the slurry, and after the drill rod returns backwards for a certain distance B, conveying the slurry again for spraying to form a second fan-shaped thin column shell, wherein the length of the second fan-shaped thin column shell is C, and C is greater than A;
3.3) when the fan-shaped guniting structure is adopted, a fan-shaped thin column shell is formed at the top of the drill hole by adopting a whole-course guniting method, so that large-range hole collapse at the top of the drill hole is prevented.
By analogy, a plurality of circular thin column shells or fan-shaped thin column shells can be formed according to the steps, the effect of reinforcing the whole drill hole is achieved, the hole wall of the drill hole is timely supported when the drill is pulled out, the efficiency of reinforcing the hole wall of the drill hole is improved, and meanwhile, large-range hole collapse caused by loose and soft crushing of surrounding rock of the drill hole is prevented, so that the gas extraction drill hole is blocked, and gas extraction is influenced.
The beneficial effects of the invention are as follows: the device for preventing the collapse of the gas extraction drill hole is reasonable in structure, easy to install, simple and effective in method, and capable of achieving guniting support drilling immediately in the process of pulling out a drill rod, improving the efficiency of reinforcing the hole wall of the drill hole, and remarkably solving the problem that various gas extraction drill holes are easy to collapse, especially the collapse of the soft coal seam.
Drawings
FIG. 1 is a schematic structural view of a guniting drill rod of a device for preventing gas extraction borehole collapse.
FIG. 2 is a schematic view of a section structure of a guniting drill rod of the device for preventing gas extraction borehole collapse.
FIG. 3 is a schematic structural view of a special drill rod of the device for preventing gas extraction borehole collapse.
FIG. 4 is a sectional view of a special drill rod of the device for preventing gas extraction borehole collapse.
FIG. 5 is a schematic view of the construction process.
Figure 6 is a cross-sectional view of a gunning ring of a first arrangement of gunning drill pipes.
FIG. 7 is a cross-sectional view of a gunite drill after guniting in a first arrangement of guniting drill rods.
Figure 8 is a cross-sectional view of a gunning ring for a second arrangement of gunning drill pipes.
FIG. 9 is a sectional view of a gunite drill after guniting in a second arrangement of guniting drill rods.
Figure 10 is a cross-sectional view of a gunning ring for a third arrangement of gunning drill pipes.
FIG. 11 is a sectional view of a drill hole after a guniting drill is guniting in a third arrangement of guniting drill rods.
Figure 12 is a cross-sectional view of a gunning ring for a fourth arrangement of gunning drill pipes.
FIG. 13 is a sectional view of a gunite drill after guniting in a fourth arrangement of guniting drill rods.
Figure 14 is a sectional view of a gunning ring for a fifth arrangement of gunning drill pipes.
FIG. 15 is a sectional view of a borehole after guniting of a guniting drill according to a fifth arrangement of guniting drill rods.
Figure 16 is a cross-sectional view of a gunning ring for a sixth arrangement of gunning drill pipes.
FIG. 17 is a sectional view of a gunite drill after guniting in a sixth arrangement of guniting drill rods.
Fig. 18 is a schematic effect diagram after the guniting construction is performed by the first guniting mode of the circular guniting structure.
Fig. 19 is a schematic diagram showing the effect of the second slurry spraying method using the circular slurry spraying structure after the slurry spraying construction.
Fig. 20 is a schematic diagram showing the effect of the first guniting method adopting the fan-shaped guniting structure after guniting construction.
Fig. 21 is a schematic diagram showing the effect of the second guniting method adopting the fan-shaped guniting structure after guniting construction.
Fig. 22 is a schematic diagram showing the effect of the guniting drill rod adopting the sixth arrangement mode of the fan-shaped guniting structure after guniting construction.
In the figure: the device comprises a 1-guniting drill rod, a 2-slurry pipeline, a 3-accelerator pipeline, a 4-guniting ring, a 5-guniting port, a 6- 'Y' -shaped pipe, a 7-spiral pipe, an 8-inverted tooth, a 9-inverted 'T' -shaped pipe, a 10-special drill rod, an 11-slurry channel, a 12-water channel, a 13-accelerator channel, 14-coal rock, a 15-drill bit, a 16-circular thin column shell, a 16 a-uniform-thickness circular thin column shell, a 16 b-non-uniform-thickness circular thin column shell, a 16 c-gradual-change circular thin column shell 16c, a 17-fan-shaped thin column shell, a 17 a-uniform-thickness fan-shaped thin column shell, a 17 b-gradual-change fan-shaped thin column shell and a 17 c-top fan-shaped thin column shell.
Detailed Description
The invention will be further described with reference to the following drawings and specific examples:
as shown in fig. 1-4, the device for preventing the collapse of the gas extraction drill hole comprises a guniting drill rod 1 and a special drill rod 10; the guniting drill rod 1 is in threaded connection with the special drill rod 10, and the bottom of the guniting drill rod 1 is connected with a drill bit 15; an accelerator channel 13, a slurry channel 11 and a water channel 12 are arranged in the special drill rod 10; the guniting drill rod 1 is a hollow drill rod, and a guniting pipeline system is arranged in the guniting drill rod; the guniting pipeline system comprises an accelerator pipeline 3, a slurry pipeline 2 and an annular guniting ring 4; when the guniting drill rod 1 is connected with the special drill rod 10, the accelerator passage 13 and the slurry passage 11 of the special drill rod 10 are respectively communicated with the accelerator pipeline 3 and the slurry pipeline 2 of the guniting drill rod 1; one end of the accelerator pipeline 3 and one end of the slurry pipeline 2 are converged into a mixed pipeline and then are connected with the annular slurry spraying ring 4, and a slurry spraying opening 5 is formed in the annular slurry spraying ring 4; the water passage 12 supplies water to the drill bit 15.
The pipe diameters of the accelerator passage 13, the slurry passage 11 and the water passage 12 are different, the pipe diameter of the water passage 12 is the largest, and then the pipe diameter of the accelerator passage 13 is the smallest in the slurry passage 11.
The quick-setting admixture pipeline 3 and the slurry pipeline 2 are converged to form a Y-shaped pipeline, a main pipe of the Y-shaped pipeline is connected with a spiral pipe 7, the other end of the spiral pipe 7 is connected with an inverted T-shaped pipeline 9, and two ends of a transverse pipe of the inverted T-shaped pipeline 9 are connected with the annular slurry spraying ring 4.
Triangular solid inverted teeth 8 are arranged in the spiral of the spiral pipe 7, so that the slurry is fully mixed with the accelerating agent, and the mixed slurry sprayed out from the slurry spraying port 5 can be rapidly solidified.
The accelerating agent is a high-strength accelerating agent, and after being fully mixed with the slurry and sprayed to the wall of the drilled hole, the slurry is accelerated to solidify; and polyester fiber materials are added into the slurry to enhance the deformation resistance of the guniting layer.
The annular guniting ring 4 is positioned at the position of 100-300mm at the bottom of the guniting drill rod 1, and a plurality of guniting ports 5 are arranged on the guniting ring 4; or the guniting ring 4 is disposed on the drill bit 15.
As shown in fig. 5-22, the arrangement of the slurry-spraying ports 5 of the annular slurry-spraying ring 4 includes a circular slurry-spraying structure in which a whole circle of slurry-spraying ports are arranged around the slurry-spraying ring, or a fan-shaped slurry-spraying structure in which a part of slurry-spraying ports are arranged around the slurry-spraying ring, the range of the slurry-spraying ring 4 without the slurry-spraying ports 5 is the range of non-slurry-spraying, and the angle θ of the non-slurry-spraying range is 0-270 °; the circular thin cylindrical shell 16 or the fan-shaped thin cylindrical shell 17 can be formed according to the range of the non-guniting theta, and the circular thin cylindrical shell 16 is formed when the theta =0 DEG, and the fan-shaped thin cylindrical shell 17 is formed when the theta is not equal to 0 deg.
The density degree of whitewashing mouth 5 set up to multiform, the density degree of whitewashing mouth 5 differs, the density degree is used for controlling the thickness of whitewashing, the more dense whitewashing mouth 5, the thicker the thickness of whitewashing: wherein, the whitewashing mouth arrangement mode of ring shape whitewashing structure does: in the first mode, the density of the guniting ports 5 is consistent, and after guniting, a round thin cylindrical shell 16a with the same thickness is formed, as shown in fig. 6-7; in the second mode, the upper parts of the guniting ports 5 are consistent in density degree, the lower parts of the guniting ports are sparse, the corresponding angle beta of the sparse range is 45-180 degrees, and after guniting, a non-thickened circular thin cylindrical shell 16b with the thickened upper part and the non-thickened lower part can be formed, as shown in fig. 8-9; in the third mode, the guniting port 5 becomes sparse gradually from the upper part to the lower part, and a circular thin cylindrical shell 16c with gradually changed thickness is formed after guniting, as shown in FIGS. 10-11; the arrangement mode of the guniting ports 5 of the fan-shaped guniting structure is as follows: fourthly, the guniting port 5 is positioned at the upper part, the corresponding angle theta 1 of the range without the guniting port 5 is 0-180 degrees, the density degree of the guniting port 5 is consistent, and a fan-shaped thin cylindrical shell 17a with the same thickness is formed after guniting, as shown in figures 12-13; the fifth mode is that the guniting port 5 is positioned at the upper part, the angle theta 1 corresponding to the range without the guniting port 5 is 0-180 degrees, the guniting port 5 gradually becomes sparse from the upper part to the lower part, and a fan-shaped thin cylindrical shell 17b with gradually changed thickness is formed after guniting, as shown in fig. 14-15; in a sixth mode, the slurry spraying ports 5 are located at the upper part, the angle theta 2 corresponding to the arrangement range is 180-270 degrees, the density degrees of the slurry spraying ports 5 are consistent, and a top fan-shaped thin cylindrical shell 17c is formed after slurry spraying, as shown in fig. 16-17.
A method for preventing gas extraction borehole collapse comprises the following steps:
step 1) installing a drilling machine and a drill rod, connecting a guniting drill rod 1 of the gas extraction drilling hole collapse prevention device with a special drill rod 10, connecting the other end of the guniting drill rod 1 with a drill bit 15, connecting the other end of the special drill rod 10 with the drilling machine, and performing drilling operation after the device is installed;
step 2) when the drilled hole reaches a preset distance, stopping drilling, starting retreating type slurry spraying, and finally spraying the slurry and the accelerator to the hole wall of the drilled hole through the annular slurry spraying ring 4 under a pipeline system to form a circular thin column shell 16 or a fan-shaped thin column shell 17 for reinforcing the hole wall;
step 3) different guniting effects are achieved according to different guniting modes and different guniting drill rods 1:
3.1) adopt ring shape whitewashing structure to carry out the whitewashing, there are two kinds of whitewashing modes:
the first mode is as follows: when the length of the first circular thin cylindrical shell 16 reaches the designed distance A, slurry is stopped to be conveyed, the drill rod is retreated backwards for a certain distance B, and then slurry is conveyed again to be sprayed to form a second circular thin cylindrical shell 16, wherein the length of the second circular thin cylindrical shell 16 is also A, as shown in FIG. 18;
the second mode is as follows: when the length of the first round thin cylindrical shell 16 reaches the designed distance A, the slurry delivery is stopped, and after the drill rod is retracted backwards for a certain distance B, the slurry is delivered again for slurry spraying to form a second round thin cylindrical shell 16, wherein the length of the second round thin cylindrical shell 16 is C, and C is larger than A, as shown in FIG. 19.
3.2) when the drill rod 1 is gunited in a fan-shaped guniting structure mode IV or a fan-shaped guniting structure mode V, two guniting modes are respectively adopted;
a first mode; when the length of the first fan-shaped thin cylindrical shell 17 reaches the designed distance A, the slurry is stopped to be conveyed, and after the drill rod is retracted backwards for a certain distance B, the slurry is conveyed again to be sprayed to form a second fan-shaped thin cylindrical shell 17, wherein the length of the second fan-shaped thin cylindrical shell 17 is C, and C is greater than A, as shown in FIG. 20;
the second mode is as follows: when the length of the first fan-shaped thin cylindrical shell 17 reaches the designed distance A, the slurry is stopped to be conveyed, and after the drill rod is retracted backwards for a certain distance B, the slurry is conveyed again to be sprayed to form a second fan-shaped thin cylindrical shell 17, wherein the length of the second fan-shaped thin cylindrical shell 17 is C, and C is greater than A, as shown in FIG. 21;
3.3) when the guniting drill rod 1 is in the fan-shaped guniting structure mode, a fan-shaped thin cylindrical shell 17 is formed at the top of a drill hole by adopting a full-process guniting method, and as shown in fig. 22, the top of the drill hole is prevented from collapsing in a large range.
By analogy, a plurality of circular thin column shells 16 or fan-shaped thin column shells 17 can be formed according to the steps, the effect of reinforcing the whole drill hole is achieved, the hole wall of the drill hole is timely supported when the drill is pulled out, the efficiency of reinforcing the hole wall of the drill hole is improved, and meanwhile, large-range hole collapse caused by loose and soft crushing of surrounding rock of the drill hole is prevented, so that the gas extraction drill hole is blocked, and gas extraction is influenced.
Wherein, the length A of the circular thin column shell 16 or the fan-shaped thin column shell 17 is generally 200-300mm, the distance B between the circular thin column shell 16 or the fan-shaped thin column shell 17 is generally 800-1200mm, the length C is generally 300-600mm, and the specific length and the distance are determined according to the situation of hole collapse in the field.
Finally, it should be noted that: the above examples are only for illustrating the technical solution of the present invention, and not for limiting the same; although the present invention has been described in detail above, those of ordinary skill in the art will understand that: which can still be modified in accordance with the principles of the present invention, various modifications thereof in accordance with the principles of the present invention should be understood to fall within the scope of the present invention.

Claims (9)

1. A device for preventing a gas extraction drill hole from collapsing is characterized by comprising a guniting drill rod and a special drill rod; the guniting drill rod is in threaded connection with the special drill rod, and the bottom of the guniting drill rod is connected with the drill bit; an accelerator passage, a slurry passage and a water passage are arranged in the special drill rod; the guniting drill rod is a hollow drill rod, and a guniting pipeline system is arranged in the guniting drill rod; the guniting pipeline system comprises an accelerator pipeline, a slurry pipeline and an annular guniting ring; when the guniting drill rod is connected with the special drill rod, the accelerator channel and the slurry channel of the special drill rod are respectively communicated with the accelerator pipeline and the slurry pipeline of the guniting drill rod; one end of the accelerator pipeline and one end of the slurry pipeline are converged into a mixed pipeline and then connected with the annular guniting ring, and the annular guniting ring is provided with a guniting port; the water channel supplies water for the drill bit.
2. The device for preventing the hole collapse of the gas extraction drill hole according to claim 1, wherein the pipe diameters of the accelerator passage, the slurry passage and the water passage are different, the pipe diameter of the water passage is the largest, and the pipe diameter of the accelerator passage is the smallest in the slurry passage.
3. The device for preventing the hole collapse of the gas extraction drill hole according to claim 1, wherein the accelerator pipeline and the slurry pipeline are converged to form a Y-shaped pipeline, a main pipe of the Y-shaped pipeline is connected with a spiral pipe, the other end of the spiral pipe is connected with an inverted T-shaped pipeline, and two ends of a transverse pipe of the inverted T-shaped pipeline are connected with the annular slurry spraying ring.
4. The device for preventing the hole collapse of the gas extraction drill hole according to claim 3, wherein triangular solid inverted teeth are arranged in the spiral of the spiral pipe, so that the slurry and the setting accelerator are fully mixed, and the mixed slurry sprayed out from the slurry spraying port can be rapidly solidified.
5. The device for preventing the hole collapse of the gas extraction drill hole according to claim 4, wherein the accelerating agent is a high-strength accelerating agent, and after the accelerating agent is fully mixed with the slurry and sprayed to the wall of the drill hole, the slurry is accelerated to solidify; and polyester fiber materials are added into the slurry to enhance the deformation resistance of the guniting layer.
6. The device for preventing the hole collapse of the gas extraction drill hole according to claim 1, wherein the annular guniting ring is located at the position of 100-300mm at the bottom of the guniting drill rod, and a plurality of guniting ports are arranged on the guniting ring; or a guniting ring is disposed on the drill bit.
7. The device for preventing the hole collapse of the gas extraction drill hole according to claim 1, wherein the arrangement mode of the slurry spraying ports of the annular slurry spraying ring comprises an annular slurry spraying structure with a whole circle of slurry spraying ports arranged around the slurry spraying ring, or a fan-shaped slurry spraying structure with a part of slurry spraying ports arranged around the slurry spraying ring, the range without the slurry spraying ports on the slurry spraying ring is the range without slurry spraying, and the angle theta of the range without slurry spraying is 0-270 degrees; according to the range of the non-guniting theta, a circular thin column shell or a fan-shaped thin column shell can be formed, wherein the circular thin column shell is formed when the theta =0 DEG, and the fan-shaped thin column shell is formed when the theta is not equal to 0 deg.
8. The device for preventing the collapse of the gas extraction drill hole according to claim 7, wherein the density degree of the grout spraying openings is set to be various, the density degree of the grout spraying openings is different, the density degree is used for controlling the thickness of the grout spraying, and the thicker the grout spraying opening is, the thicker the grout spraying opening is: wherein, the whitewashing mouth arrangement mode of ring shape whitewashing structure does: the first mode is that the density degree of the guniting ports is consistent, and a round thin cylindrical shell with the same thickness is formed after guniting; the upper part of the guniting port is consistent in density degree, the lower part of the guniting port is sparse, the corresponding angle of the sparse range is 45-180 degrees, and after guniting, a circular thin cylindrical shell with thickened upper part and non-thickened lower part can be formed; the third mode is that the guniting port becomes sparse gradually from the upper part to the lower part, and a circular thin column shell with gradually changed thickness is formed after guniting; the arrangement mode of the guniting ports of the fan-shaped guniting structure is as follows: the method is characterized in that the guniting port is positioned at the upper part, the corresponding angle of the range without the guniting port is 0-180 degrees, the density degree of the guniting port is consistent, and a fan-shaped thin cylindrical shell with the same thickness is formed after guniting; the method is characterized in that a guniting port is positioned at the upper part, the corresponding angle of the range without the guniting port is 0-180 degrees, the guniting port gradually becomes sparse from the upper part to the lower part, and a fan-shaped thin cylindrical shell with gradually changed thickness is formed after guniting; and in the sixth mode, the slurry spraying ports are positioned at the upper part, the corresponding angles of the arrangement range are 180-270 degrees, the density degrees of the slurry spraying ports are consistent, and the top fan-shaped thin cylindrical shell is formed after slurry spraying.
9. The method for preventing the collapse of the gas extraction drill hole by using the device of any one of claims 1 to 8 is characterized by comprising the following steps of:
step 1) installing a drilling machine and a drill rod, connecting a guniting drill rod of the gas extraction drilling hole collapse prevention device with a special drill rod, connecting the other end of the guniting drill rod with a drill bit, connecting the other end of the special drill rod with the drilling machine, and performing drilling operation after the device is installed;
step 2) when the drilled hole reaches a preset distance, stopping drilling, starting retreating type slurry spraying, and finally spraying the slurry and the accelerator to the hole wall of the drilled hole through an annular slurry spraying ring under a pipeline system to form a circular thin column shell or a fan-shaped thin column shell reinforced hole wall;
step 3) different guniting effects are achieved according to different guniting modes and different guniting drill rods:
3.1) adopt ring shape whitewashing structure to carry out the whitewashing, there are two kinds of whitewashing modes:
the first mode is as follows: when the length of the first circular thin column shell reaches the design distance A, stopping conveying the slurry, and after the drill rod returns backwards for a certain distance B, conveying the slurry again for spraying to form a second circular thin column shell, wherein the length of the second circular thin column shell is also A;
the second mode is as follows: when the length of the first circular thin column shell reaches a designed distance A, stopping conveying the slurry, and after the drill rod returns backwards for a certain distance B, conveying the slurry again for spraying to form a second circular thin column shell, wherein the length of the second circular thin column shell is C, and C is greater than A;
3.2) when a four-way or five-way guniting drill rod of a fan-shaped guniting structure is adopted, two guniting ways are respectively adopted;
a first mode; when the length of the first fan-shaped thin column shell reaches a designed distance A, stopping conveying the slurry, and after the drill rod returns backwards for a certain distance B, conveying the slurry again for spraying to form a second fan-shaped thin column shell, wherein the length of the second fan-shaped thin column shell is C, and C is greater than A;
the second mode is as follows: when the length of the first fan-shaped thin column shell reaches a designed distance A, stopping conveying the slurry, and after the drill rod returns backwards for a certain distance B, conveying the slurry again for spraying to form a second fan-shaped thin column shell, wherein the length of the second fan-shaped thin column shell is C, and C is greater than A;
3.3) when the guniting drill rod is in a fan-shaped guniting structure mode, a fan-shaped thin column shell is formed at the top of a drill hole by adopting a whole-course guniting method, so that large-range hole collapse at the top of the drill hole is prevented; by analogy, a plurality of circular thin column shells or fan-shaped thin column shells can be formed according to the steps, the effect of reinforcing the whole drill hole is achieved, the hole wall of the drill hole is timely supported when the drill is pulled out, the efficiency of reinforcing the hole wall of the drill hole is improved, and meanwhile, large-range hole collapse caused by loose and soft crushing of surrounding rock of the drill hole is prevented, so that the gas extraction drill hole is blocked, and gas extraction is influenced.
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