CN114198137A - Directional long drilling construction method and large-area regional arrangement method for broken and soft coal seam with complex structure - Google Patents
Directional long drilling construction method and large-area regional arrangement method for broken and soft coal seam with complex structure Download PDFInfo
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- CN114198137A CN114198137A CN202111451253.7A CN202111451253A CN114198137A CN 114198137 A CN114198137 A CN 114198137A CN 202111451253 A CN202111451253 A CN 202111451253A CN 114198137 A CN114198137 A CN 114198137A
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21F—SAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, OR DRAINING IN OR OF MINES OR TUNNELS
- E21F7/00—Methods or devices for drawing- off gases with or without subsequent use of the gas for any purpose
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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
- E21B21/00—Methods or apparatus for flushing boreholes, e.g. by use of exhaust air from motor
- E21B21/14—Methods or apparatus for flushing boreholes, e.g. by use of exhaust air from motor using liquids and gases, e.g. foams
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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
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/10—Geothermal energy
Abstract
The invention provides a directional long drilling construction method and a large-area regional arrangement method for a broken soft and complex-structure coal seam, belongs to the technical field of gas extraction of broken soft and complex-structure coal seams, mainly solves the problem that large-area long-distance extraction cannot be realized in the conventional broken soft and complex-structure coal seams, and improves the gas extraction efficiency of the broken soft and complex coal seams. The technical scheme adopted by the invention is as follows: the method comprises the steps of selecting high-power large-torque automatic directional drilling equipment, matching with a proper drilling tool, a punching drilling tool, a hole protecting drilling tool and the like, constructing a coal seam strike exploration hole (also used as an extraction hole) and a pressure relief and permeability increase extraction main hole in a regional coal seam, and implementing large-diameter sieve tube hole protection, thereby realizing large-area and long-distance drilling arrangement and extraction of a broken and soft coal seam with a complex structure.
Description
Technical Field
The invention belongs to the technical field of gas extraction of broken and soft coal seams with complex structures, and particularly discloses a directional long drilling construction method and a large-area regional arrangement method for broken and soft coal seams with complex structures.
Background
The broken soft and complex-structure coal seam means that the hardness coefficient f of coal in the coal seam is 0.3-0.8 and the coal seam has soft and hard layering: soft layering with f value of 0.3-0.5 and hard layering with f value of 0.5-0.8 are arranged in the coal bed; besides, the coal seam has a structure of falling columns, folds, faults and the like with the length of more than 3 meters, and also has a small structure with the length of less than 3 meters. The coal bed is complex in overall occurrence, and the gas content of the coal bed is 8m3More than t, the method influences the safety recovery of the working surface of the mine. The conventional hole collapse, hole pressing, hole blocking and the like are adopted for drilling in the coal seam, and the construction of long drilling holes with the length of more than 400 meters and the arrangement of large-area regional drilling holes are not facilitated.
Aiming at the difficult problem of gas control of a broken soft coal seam with a complex structure, experts and scholars at home and abroad explore for a long time, and the current commonly used technologies mainly comprise: firstly, arranging a bottom plate rock roadway in a rock stratum at the lower part of a coal seam, and performing gas extraction by using a common drilling equipment construction layer-crossing short drilling hole and hydraulic permeability increasing technology without a directional drilling function; secondly, aiming at the coal seam with the condition of multiple coal seams, firstly performing a protective layer, and then extracting the pressure-relieved protected layer by utilizing the pressure relief influence of the protective layer mining; thirdly, exploring directional long drilling construction mainly comprising comb-shaped drilling of the top plate and the bottom plate for extraction; and fourthly, improving the drilling tool, performing extraction by using the strong slag discharging function of the spiral wide-fin drill rod and the bedding drilling of wind power slag discharging construction, and the like. The technology mainly has the problems of high rock roadway construction cost, short effective extraction length of the drilled hole (about 100 meters), short coverage range and service time of the drilled hole and the like, and large-area regional efficient extraction of the broken soft structure complex coal seam cannot be realized.
Disclosure of Invention
The invention aims to provide a directional long drilling construction method and a large-area regionalization arrangement method for a broken and soft coal seam with a complex structure, and large-area regionalization and high-efficiency extraction of the broken and soft coal seam with the complex structure is realized.
In order to achieve the aim, the invention provides a directional long drilling construction method for a broken soft and complicated-structure coal seam, which comprises the following steps:
s1, constructing coal seam strike detection drill holes and calibrating coal seam strike
Exploring the hard layering trend along a hard layering construction exploring drill hole, wherein the exploring drill hole comprises an upper exploring drill hole and a lower exploring drill hole, the upper exploring drill hole is upwards branched to explore the top plate of the coal seam at intervals of a preset distance to determine the upper trend of the coal seam, the lower exploring drill hole is downwards branched to explore the bottom plate of the coal seam at intervals of a preset distance to determine the lower trend of the coal seam, and finally, the full-coal thickness trend is calibrated;
s2, constructing the extraction drill hole
Constructing an extraction drill hole between the upper exploration drill hole and the lower exploration drill hole, constructing the extraction drill hole along hard layering, and punching and protecting the hole after drilling;
and S3, sealing the exploration drilling hole and the extraction drilling hole.
Further, in step S1, the adopted drilling equipment is directional drilling equipment, and the adopted drilling tool includes a high-pressure-resistant sealed spiral hollow drill rod or a wired cable drill rod, a probe tube, an upper and lower non-magnetic, screw motor and a drill bit, and the probe tube, the upper and lower non-magnetic and wireless measurement while drilling system; in the process of drilling construction, the upper part trend of the coal seam is calibrated through a measurement while drilling system and slag discharge; and in the process of drilling a lower exploration and determination hole, calibrating the trend of the lower part of the coal seam by a measurement while drilling system and slag discharge.
Further, in step S2, constructing an extraction borehole in a hard layer by using drilling equipment and a drilling tool which are the same as the drilling hole, completing the replacement of the hydraulic punching and cutting tool in the drilling construction, and realizing single-stage or multi-stage punching by connecting a drill rod with the hydraulic punching and cutting tool, wherein the drilling tool rotates and is pushed back and forth within a preset length range in the punching process until the returned water becomes clear; selecting backward punching or forward punching according to the inclination angle of the drilling condition; when the drill hole is an upward drill hole with an inclination angle of more than 0 degrees, a retreating type punching hole is selected; when the drill hole is drilled downwards at an angle of less than or equal to 0 degree, forward punching is adopted; after hydraulic punching operation is completed, the hole protecting drilling tool is replaced to drill to the bottom of the hole, an underground air supply system is used for blowing and sweeping the hole, accumulated water and coal cinder in the hole are drained, and then the hole protecting sieve tube is arranged along the hole protecting drilling tool to realize large-diameter hole protection.
Further, in step S2, extracting drill holes are constructed in the hard layer by using drilling equipment and drilling tools which are the same as the drilling holes, and after the drilling construction is completed, the hollow hydraulic punching and cutting drilling tools are matched with the hollow drill rod and the hollow drill bit to realize punching-hole protection integration, and the drilling is performed first and then the screen pipe is placed.
Further, in step S3, if the exploration borehole and the extraction borehole are bedding directional long boreholes, sealing the borehole to cover the borehole stress concentration region; and if the exploration drilling hole and the extraction drilling hole are crossing directional long drilling holes, sealing the whole rock section and exceeding the coal-rock interface.
Furthermore, the construction site of the bedding directional long drill hole is in a coal seam roadway, and the construction site of the through-layer directional long drill hole is in a bottom pumping roadway at the lower part of the coal seam.
Furthermore, the distance between the upper exploration fixed drill hole, the extraction drill hole and the lower exploration fixed drill hole is 2 times of the coal seam extraction radius measured on site.
Further, the directional drilling equipment is automatic drilling equipment with the torque of more than 15000 N.m; the outer diameter of the high-pressure-resistant sealed spiral hollow drill rod is 89mm, and the inner diameter of the high-pressure-resistant sealed spiral hollow drill rod is 50 mm; the diameter of a drill bit for drilling is more than 120 mm; the water supply pressure during punching is 20MPa, the maximum supply pressure of an equipped pump set is 50MPa, and the water supply amount is 400L/min; the hole diameter of a hollow drill bit in the hole-protecting drilling tool is more than 160mm, the outer diameter of a hollow drill rod is more than 100mm, the inner diameter of the hollow drill rod is more than 80mm, and the diameter of a hole-protecting sieve pipe is more than 70 mm.
The invention also provides a large-area regional arrangement method for the directional long drill holes of the broken soft coal seam with complex structure, wherein in the area of more than 300 m multiplied by 2000 m, the through-layer directional long drill holes and the bedding directional long drill holes are arranged according to the tunneling of the coal seam roadway of the mine and the extraction condition of the working face, and the through-layer directional long drill holes and the bedding directional long drill holes are all completed by adopting the construction method for the directional long drill holes of the broken soft coal seam with complex structure;
s1, constructing a cross-layer directional long drill hole in a bottom suction roadway at the lower part of the coal seam, pre-pumping the coal seam roadway, and protecting the coal seam roadway from tunneling;
and S2, directionally and long drilling holes in the coal seam construction bedding of the area to be stoped in the constructed coal seam roadway, wherein the length of the drilled holes covers the whole area to be stoped and the coal roadway to be excavated, and the coal seam in the working face to be stoped and the coal roadway to be excavated is pre-pumped.
Further, the pre-pumping time of the coal seam main roadway is 2 years; the pre-pumping time of the coal seam in the working face to be stoped and the coal roadway to be tunneled is 2 years.
The present invention has the following advantageous effects.
The invention applies high-power large-torque underground directional drilling equipment, is matched with a proper drilling tool, a punching tool, a hole protecting tool and the like, constructs a high-efficiency stable extraction directional long drill hole integrating trend determination, pressure relief and permeability improvement and large-diameter hole protecting in a broken soft structure complex coal seam, and optimizes the arrangement of the drill hole in a large range on the technology, so that the extraction drill hole has the functions of effectively shielding coal roadway excavation, ensuring long-time pre-extraction of a working face and the like, and realizes the high-efficiency extraction of the broken soft structure complex coal seam.
Drawings
FIG. 1 is a schematic diagram of a coal seam with a broken soft and complex structure
FIG. 2 is a schematic cross-sectional view of a fixed borehole (a roof hole of a coal seam) in FIG. 2
FIG. 3 is a schematic cross-sectional view of a drill hole (for detecting a coal seam floor hole)
FIG. 4 is a schematic cross-sectional view of an extraction borehole (main extraction hole)
FIG. 5 plan view of a single set of directional long borehole arrangements
FIG. 6 is a cross-sectional view of a bottom suction roadway through-layer long borehole
FIG. 7 schematic view of drill-in-hole drill attachment
FIG. 8 is a schematic view of the connection of the drilling tool for punching holes in a single stage punching
FIG. 9 is a schematic view of the connection of the punching tool in the drilling hole in the multi-stage punching
FIG. 10 is a schematic view showing the connection of the drilling tool and the screen pipe for drilling the inner hole during the punching-hole-protection step-by-step operation
FIG. 11 is a schematic view showing the connection of a drilling tool for drilling an inner hole and a screen pipe when punching and hole protection are integrated
Fig. 12 is a schematic plan view of a large-area regionalized directional long drilling arrangement.
In the figure: 1-upper detection and setting of a borehole, 2-extraction and drilling, 3-lower detection and setting of a borehole, 4-high pressure resistant sealing of a spiral hollow drill rod, 5-probe and upper and lower non-magnetic, 6-screw motor, 7-drill bit, 8-hydraulic punching and cutting drill, 9-hollow drill bit, 10-hollow drill rod, 11-hole protection sieve tube, 12-hollow hydraulic punching and cutting drill, and 13-sieve tube fixer;
101-coal seam roof, 102-soft stratum, 103-hard stratum, 104-coal seam floor, 105-fold, 106-fault, 107-collapse column, 108-hole sealing section, 109-bottom drawing lane, 110-coal rock interface, 111-drilling hole, 112-coal seam, 113-coal seam main lane, 114-dug coal lane, 115-to-be-mined working face, 116-mining working face, 117-goaf, 118-tunneling lane, 119-crossing directional long drilling hole and 120-bedding directional long drilling hole.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it should be understood that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The embodiment comprises two major parts of directional long drilling design, construction and long drilling regionalization arrangement of a broken soft and complicated-structured coal seam (such as figure 1).
(1) The design and construction of single-group directional long drill holes adopt a whole set construction method of 'strike detection-pressure relief permeability improvement-large-diameter hole protection' long drill holes.
In the aspect of drilling design:
the single group of drill holes for the broken soft structure complex coal seam comprise 3 main branch holes which are an upper fixed drill hole 1, an extraction drill hole 2 and a lower fixed drill hole 3 respectively. The upper locating drill hole 1 is designed to be a short branch hole towards the direction of the coal seam roof 101 to calibrate the strike of the upper part of the coal seam and identify the hardness and hardness of the coal seam (as shown in fig. 2). The lower fixed drilling hole 3 is designed to be a short branch hole towards the direction of the coal seam floor 104 for calibrating the strike direction of the lower part of the coal seam and identifying the hardness and hardness of the coal seam (as shown in fig. 3). On the basis of coal seam strike calibration and coal seam soft and hard layering identification, an extraction drill hole 2 is designed, the extraction drill hole 2 is constructed along a hard layering 103, punching and hole protection are needed, and the extraction drill hole 2 is also a main extraction hole of the drill holes (shown in figure 4). As shown in fig. 5, in a single-group directional long borehole arrangement plan, the distance between an upper exploration borehole 1, an extraction borehole 2 and a lower exploration borehole 3 is 2R, and R is the coal seam extraction radius measured on site.
It should be noted that all the directional long drill holes in bedding are shown in fig. 2 to fig. 4, fig. 6 is a cross-sectional schematic view of the directional long drill hole in crossing, the construction site of the directional long drill hole in bedding is in a coal seam roadway, and the construction site of the directional long drill hole in crossing is in a bottom suction roadway 109 at the lower part of the coal seam.
In the aspect of drilling construction:
the method is characterized in that high-power large-torque (more than 15000 N.m) automatic directional drilling equipment is used as a main body, a corresponding drilling tool is matched, single-group drilling construction is carried out, three main branch holes, namely an upper exploration drilling hole 1, an extraction drilling hole 2 and a lower exploration drilling hole 3, are arranged in the single-group drilling hole, and the construction sequence comprises the upper exploration drilling hole 1, the lower exploration drilling hole 3 and the extraction drilling hole 2.
The construction steps are as follows:
1) construction of upper and lower probe boreholes 1 and 3
The directional drilling equipment, the high-pressure-resistant sealed spiral hollow drill rod 4 (or the wired cable drill rod), the exploring tube, the upper and lower non-magnetic 5, the screw motor 6 and the drill bit 7 are used for drilling, and as shown in figure 7, the hole diameter of the drilled hole is more than 120 mm. In the construction process of the upper exploration drilling hole 1, branches are opened to the direction of the coal seam roof 101 at intervals of 30 meters, and the direction of the upper part of the coal seam is calibrated by a measurement-while-drilling system, slag discharge and the like when the construction of the upper exploration drilling hole 1 is followed; the drilling equipment of the lower fixed drill hole 3 is the same as the drilling tool and the upper fixed drill hole 1, and the difference is that the drilling equipment branches to the direction of the coal seam floor 104 every 30 meters, and the direction of the lower part of the coal seam is calibrated by following the construction of the upper fixed drill hole 1; according to the construction conditions of the upper detection drill hole 1 and the lower detection drill hole 3, the coal bed trend and the layering condition of soft and hard coal beds within the width range of 6R can be basically calibrated.
2) Construction of extraction boreholes 2
The extraction drill hole 2 is constructed in a calibrated hard layer 103 of the coal bed by using the same drilling equipment and drilling tools as the upper detection drill hole 1 and the lower detection drill hole 3, after the drilling construction is finished, a measurement-while-drilling system is reduced, the hydraulic punching and cutting tool 8 is replaced, the cutting, scouring and discharging of coal around the drill hole are implemented, the overall pressure relief of the coal bed is realized, and the gas of the coal in a larger range can be favorably converged into the drill hole, the concrete connection is as shown in figures 8 and 9, the single-stage or multi-stage punching can be realized through the connection of a drill rod and the hydraulic punching and cutting tool 8, the water supply pressure during punching is generally about 20MPa, the maximum supply pressure of an equipped pump set is 50MPa, the capacity of processing complex conditions is improved, and the water supply amount refers to the slag discharge amount and is generally about 400L/min. In the punching process, the drilling tool needs to rotate and also needs to be pushed in a reciprocating manner within a certain length range until the returned water becomes clear.
According to the inclination angle of the drilling condition, backward punching or forward punching is selected, when the drilling is upward drilling (the inclination angle of the drilling is more than 0 degrees), the backward punching is generally selected, namely, a hydraulic punching and cutting drilling tool 8 is drilled to the bottom of a hole and retreats for punching, and the water-coal mixture punched in the hole is smoothly discharged through gravity and a drill rod spiral; when the drilling hole is a downward drilling hole (the inclination angle of the drilling hole is less than or equal to 0 degrees), in order to avoid the coal cinder from being flushed out and remaining at the bottom of the hole, forward punching is generally adopted, so that the water-coal mixture is discharged as soon as possible.
After the hydraulic punching operation is completed, a hole protecting drilling tool (the aperture of the hollow drill bit 9 is more than 160mm, the outer diameter of the hollow drill rod 10 is more than 100mm, and the inner diameter of the hollow drill rod 10 is more than 80 mm) is replaced to drill to the bottom of the hole, a downhole air supply system is used for blowing and sweeping the hole, accumulated water and coal cinder in the hole are drained, then a hole protecting sieve tube 11 with the diameter of more than 70mm is arranged along the hole protecting drilling tool, the large-diameter hole protection is realized, and an extraction channel is ensured (as shown in figure 10).
It should be noted that, for the punching and hole protecting of the extraction drilled hole 2, a punching drilling tool and a hole protecting drilling tool can be combined to realize the integration of punching and hole protecting (as shown in fig. 11), namely, a hollow hydraulic punching and cutting drilling tool 12 is matched with a hollow drill rod 10 and a hollow drill bit 9, and a sieve tube with the diameter of about 50mm is punched firstly and then is arranged.
And completing the construction of a single group of drill holes, performing hole sealing operation, wherein the hole sealing length of the directional long drill holes along the layer needs to be more than 20 meters, and the hole sealing range covers a drill hole stress concentration area. The hole sealing length of the cross-layer directional long drilling exceeds the range of 5 meters of the coal rock interface to cover the drilling stress concentration area.
(2) The arrangement of large-area regionalized directional long drill holes means that the long drill holes integrating 'strike detection, pressure relief permeability improvement and large-diameter hole protection' are determined as a group of complete drill holes, the group of drill holes can be bedding directional long drill holes or penetrating directional long drill holes, and in terms of length requirements, the designed length of a working face of a mine is taken as the standard, and the length is generally more than 400 meters.
According to the tunneling condition of a coal seam roadway of a mine and the stoping condition of a working face, two types of directional long drill holes are required to be arranged, namely a through-layer directional long drill hole and a bedding directional long drill hole. The construction site of the cross-layer directional long drill hole 119 is in the bottom pumping roadway 109 at the lower part of the coal seam, and mainly shields the coal seam main roadway 113 (the coal seam gas content is 8 m)3Above or coal seam gas pressure above 0.74MPa or identified as a outburst risk, unsuitable for coal roadways directly arranged in coal seams). The bedding directional long drill hole 120 is constructed towards the coal seam of the area to be stoped in the already constructed coal seam roadway (dug coal roadway 114), and the length of the drill hole can cover the whole area to be stoped and the coal roadway to be dug. As shown in fig. 12, the coal seam roadway 113 is excavated by directional long through-seam drilling and then is coveredAnd (3) directionally drilling long holes along the construction bedding in the constructed coal seam roadway, pre-pumping the coal seam in the coal seam roadway to be mined and the working face 115 to be mined for a long time (about 2 years), and ensuring the mining safety of the working face and the tunneling safety of the working face. A group of complete drill holes are continuously constructed and arranged along a roadway (coal roadway or rock roadway), so that the accurate detection of the coal seam trend in a large range (more than 300 meters multiplied by 2000 meters) and the pre-pumping of the coal seam are ensured, the large-area regionalized drill hole arrangement and the extraction regionalized long drill hole arrangement are realized, and the virtuous cycle and the ordered connection of the extraction-roadway driving-working face extraction of the broken soft coal seam with a complex structure are realized.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.
Claims (10)
1. A directional long drilling construction method for a broken soft coal seam with a complex structure is characterized by comprising the following steps:
s1, constructing coal seam strike detection drill holes and calibrating coal seam strike
Exploring the hard layering trend along a hard layering construction exploring drill hole, wherein the exploring drill hole comprises an upper exploring drill hole and a lower exploring drill hole, the upper exploring drill hole is upwards branched to explore the top plate of the coal seam at intervals of a preset distance to determine the upper trend of the coal seam, the lower exploring drill hole is downwards branched to explore the bottom plate of the coal seam at intervals of a preset distance to determine the lower trend of the coal seam, and finally, the full-coal thickness trend is calibrated;
s2, constructing the extraction drill hole
Constructing an extraction drill hole between the upper exploration drill hole and the lower exploration drill hole, constructing the extraction drill hole along hard layering, and punching and protecting the hole after drilling;
and S3, sealing the exploration drilling hole and the extraction drilling hole.
2. The directional long drilling construction method for the crushed soft coal seam with the complicated structure as claimed in claim 1, wherein in step S1, the adopted drilling equipment is directional drilling equipment, the adopted drilling tool comprises a high pressure-resistant sealed spiral hollow drill rod or a wired cable drill rod, a probe tube, an upper and lower non-magnetic and screw motor and a drill bit, and the probe tube and the upper and lower non-magnetic wireless measurement while drilling system;
in the process of drilling construction, the upper part trend of the coal seam is calibrated through a measurement while drilling system and slag discharge;
and in the process of drilling a lower exploration and determination hole, calibrating the trend of the lower part of the coal seam by a measurement while drilling system and slag discharge.
3. The directional long drilling construction method for the broken soft coal seam with the complicated structure as claimed in claim 2, wherein in step S2, the drilling equipment and the drilling tool which are the same as the exploration drilling hole are adopted to construct extraction drilling holes in the hard layer, the hydraulic punching and cutting tool is replaced after the drilling construction is completed, the single-stage or multi-stage punching is realized through the connection of the drill rod and the hydraulic punching and cutting tool, and the drilling tool rotates and pushes back and forth within the preset length range in the punching process until the returned water becomes clear;
selecting backward punching or forward punching according to the inclination angle of the drilling condition; when the drill hole is an upward drill hole with an inclination angle of more than 0 degrees, a retreating type punching hole is selected; when the drill hole is drilled downwards at an angle of less than or equal to 0 degree, forward punching is adopted;
after hydraulic punching operation is completed, the hole protecting drilling tool is replaced to drill to the bottom of the hole, an underground air supply system is used for blowing and sweeping the hole, accumulated water and coal cinder in the hole are drained, and then the hole protecting sieve tube is arranged along the hole protecting drilling tool to realize large-diameter hole protection.
4. The directional long drilling construction method for the broken soft coal seam with the complicated structure as claimed in claim 2, wherein in step S2, extraction drill holes are constructed in hard layering by adopting drilling equipment and drilling tools which are the same as the fixed drill holes, and after the drilling construction is finished, a hollow hydraulic punching and cutting drilling tool is matched with a hollow drilling rod and a hollow drill bit to realize the punching-hole protecting integration, and a hole is punched firstly and then a screen pipe is put.
5. The directional long drilling construction method for the broken soft coal seam with the complicated structure according to the claim 3 or 4, characterized in that in the step S3, if the exploration drilling hole and the extraction drilling hole are bedding directional long drilling holes, the hole sealing covers a drilling hole stress concentration area;
and if the exploration drilling hole and the extraction drilling hole are crossing directional long drilling holes, sealing the whole rock section and exceeding the coal-rock interface.
6. The directional long drilling construction method for the coal seam with the broken soft structure and the complicated structure as claimed in claim 5, wherein the construction site of the bedding directional long drilling hole is in a coal seam roadway, and the construction site of the through-layer directional long drilling hole is in a bottom suction roadway at the lower part of the coal seam.
7. The directional long drilling construction method for the broken soft coal seam with the complicated structure as claimed in claim 6, wherein the distance between the upper exploration drilling hole, the extraction drilling hole and the lower exploration drilling hole is 2 times of the extraction radius of the coal seam measured on site.
8. The directional long drilling construction method for the crushed soft and complicated-structure coal seam according to claim 3, characterized in that the directional drilling equipment is automatic drilling equipment with the torque of more than 15000N-m;
the outer diameter of the high-pressure-resistant sealed spiral hollow drill rod is 89mm, and the inner diameter of the high-pressure-resistant sealed spiral hollow drill rod is 50 mm;
the diameter of a drill bit for drilling is more than 120 mm;
the water supply pressure during punching is 20MPa, the maximum supply pressure of an equipped pump set is 50MPa, and the water supply amount is 400L/min;
the hole diameter of a hollow drill bit in the hole-protecting drilling tool is more than 160mm, the outer diameter of a hollow drill rod is more than 100mm, the inner diameter of the hollow drill rod is more than 80mm, and the diameter of a hole-protecting sieve pipe is more than 70 mm.
9. A large-area regional arrangement method for directional long drill holes of a broken soft and complicated-structure coal seam is characterized in that in an area of more than 300 m x 2000 m, through-layer directional long drill holes and bedding directional long drill holes are arranged according to the tunneling of a mine coal seam roadway and the extraction condition of a working face, and the through-layer directional long drill holes and the bedding directional long drill holes are both completed by adopting the construction method for the directional long drill holes of the broken soft and complicated-structure coal seam according to any one of claims 1 to 7;
s1, constructing a cross-layer directional long drill hole in a bottom suction roadway at the lower part of the coal seam, pre-pumping the coal seam roadway, and protecting the coal seam roadway from tunneling;
and S2, directionally and long drilling holes in the coal seam construction bedding of the area to be stoped in the constructed coal seam roadway, wherein the length of the drilled holes covers the whole area to be stoped and the coal roadway to be excavated, and the coal seam in the working face to be stoped and the coal roadway to be excavated is pre-pumped.
10. The directional long drilling large-area regionalization arrangement method for the crushed soft and complicated-structure coal seam according to claim 9, characterized in that the pre-pumping time of the coal seam roadway is 2 years;
the pre-pumping time of the coal seam in the working face to be stoped and the coal roadway to be tunneled is 2 years.
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| CN116464502A (en) * | 2023-05-27 | 2023-07-21 | 中煤第三建设（集团）有限责任公司 | Pneumatic directional pore-forming construction method for high-stress broken soft coal layer gas extraction drilling |
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| CN116464502A (en) * | 2023-05-27 | 2023-07-21 | 中煤第三建设（集团）有限责任公司 | Pneumatic directional pore-forming construction method for high-stress broken soft coal layer gas extraction drilling |
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