CN113123720A - Construction process for treating grouting holes and simultaneously using grouting holes as gas extraction holes in water damage area of coal seam floor - Google Patents
Construction process for treating grouting holes and simultaneously using grouting holes as gas extraction holes in water damage area of coal seam floor Download PDFInfo
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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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- 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
- E21B23/00—Apparatus for displacing, setting, locking, releasing, or removing tools, packers or the like in the boreholes or wells
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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
- E21B29/00—Cutting or destroying pipes, packers, plugs, or wire lines, located in boreholes or wells, e.g. cutting of damaged pipes, of windows; Deforming of pipes in boreholes or wells; Reconditioning of well casings while in the ground
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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
- E21B33/00—Sealing or packing boreholes or wells
- E21B33/10—Sealing or packing boreholes or wells in the borehole
- E21B33/13—Methods or devices for cementing, for plugging holes, crevices, or the like
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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
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/11—Perforators; Permeators
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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
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/25—Methods for stimulating production
- E21B43/26—Methods for stimulating production by forming crevices or fractures
- E21B43/261—Separate steps of (1) cementing, plugging or consolidating and (2) fracturing or attacking the formation
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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
- E21B7/046—Directional drilling horizontal drilling
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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
- E21B7/06—Deflecting the direction of boreholes
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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
- E21B7/20—Driving or forcing casings or pipes into boreholes, e.g. sinking; Simultaneously drilling and casing boreholes
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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
Abstract
The invention relates to the field of geological and hydrogeological exploration and drilling, in particular to a construction process for treating a grouting hole and simultaneously using the grouting hole as a gas extraction hole in a water damage area of a coal seam floor. The method comprises the following steps: firstly, implementing a multi-branch horizontal well water damage engineering construction grouting hole for a coal seam floor confined aquifer by the ground in advance, and specifically comprising the following steps: a straight hole section; two straight holes and an oblique section are opened; three horizontal sections are arranged; performing pipe cutting and drawing operation on the inclined section technical casing; sealing the drilled hole with cement paste; step two, implementing an L-shaped horizontal well gas drainage project construction gas extraction hole on the coal seam or the top of the coal seam in advance on the ground: secondly, opening a casing for extraction with adaptive aperture; the three-opening adaptive aperture adopts an inclined section and an L-shaped horizontal well horizontal hole section; and (4) a gas extraction section with a three-opening adaptive aperture is arranged in a casing of the extraction section. The advantages are that: the green exploration construction effect of cost reduction, efficiency improvement and environment protection is achieved.
Description
Technical Field
The invention relates to the field of geological and hydrogeological exploration and drilling, in particular to a construction process for treating a grouting hole and simultaneously using the grouting hole as a gas extraction hole in a water damage area of a coal seam floor.
Background
The mine water disaster belongs to one of five disasters of coal mines, and the implementation of grouting transformation on an aquifer is the most direct and effective technical means aiming at the coal seam floor water disaster.
The grouting transformation is a method and means for changing the hydrogeological conditions of rock mass (layer), and the basic principle is that under the action of a certain pressure, slurry is used to replace and fill the gaps or channels occupied by water in the injected layer in a certain period of time until dehydration, consolidation or gelation occurs, so that the stone-forming body or the gel and the surrounding rock body form a water-blocking whole body, and finally the grouting transformation is transformed into a process without water or a weak water-bearing layer, thereby changing the hydrogeological conditions which are not beneficial to mining.
The development process of exploring, managing and treating water damage of the bottom plate comprises the following steps: before 2010, the water damage of the bottom plate is mainly explored and managed by adopting a ground straight hole or an underground inclined hole in China; in 2012, the orientation technology is used for exploring and treating an underground Ordovician limestone water guide channel and is successfully applied to Hancheng mulberry lawn coal mines; in 2013, the ground orientation technology is used for detecting and treating the dust and water damage of the Ordovician Olympic at the bottom plate, and the technology is successfully applied to energy source peak mining areas in hopes; in 2014, a directional bedding drilling thin-layer limestone exploration and reinforcement technology test is successful, and the technology is successfully applied to a Huainan Zhuzhuang coal mine; in 2014, the technology is successively popularized to large coal mine areas such as Anhui Huaihei, Huainan, Shandong Qiqu, Henan jiao, Hebei handan, and a chan, and good treatment effects are obtained.
The key technology of regional treatment is as follows: the ground horizontal bedding directional drilling is a directional drilling technology which utilizes a special well bottom power tool and a measurement while drilling technology to drill a well with a well deflection larger than a certain angle and keep the angle to drill a certain rock stratum section, and comprises measurement while drilling, well track control, well wall stabilizing technology and the like. At present, the horizontal directional drilling technology is applied to the field of water prevention and control of coal mines, aims to explore complex geological structures and perform advanced treatment, and the horizontal directional drilling technology is applied to grouting transformation on confined aquifers of coal seam floors. Generally, a vertical well is constructed on the ground, and then the vertical well is inclined to enter a target aquifer to become a horizontal well at a certain depth, so that the target aquifer is fully exposed. During drilling, a water guide structure, a water dissolution gap and a water dissolution hole (cave) are mainly found, and if a large amount of drilling fluid is leaked due to water guide cracks and the like, grouting is immediately carried out for treatment; and if the water flowing crack and other structures are not found after the water flowing crack enters the target aquifer, constructing the multi-horizontal branch hole and continuously searching the water flowing crack structure. When a structure such as a water-guiding crack is found or drilling fluid leaks in the drilling process, a water pressing test is carried out, and the grouting amount and the concentration are determined according to the water absorption amount, so that the aim of treating the ground advanced area is fulfilled.
In addition, gas control is always a difficult problem faced by high gas and outburst mines in China, coal gas content in local areas of most coal mines in China is high, the mines are still diluted by adopting local ventilation, the gas concentration of a mining working face is reduced, and production safety is guaranteed. Particularly under the conditions of complex geological structure, shallow coal seam burial and coal seam group mining, the mine mostly adopts the technology of implementing straight hole and L-shaped horizontal well fracturing advanced extraction pressure relief gas on the coal seam or a coal seam roof (constructional coal) by the ground, thereby effectively reducing the threat of the gas to the mine safety production and powerfully ensuring the life safety of miners.
At present, through analysis of gas extraction results of different types of horizontal wells built in domestic coal mines, the phenomena of hole collapse, drill sticking and the like are easy to occur in construction of an L-shaped horizontal well in a constructed coal seam and the well forming rate is not ideal under the influence of factors such as reservoir pressure, coal rock mechanical properties and the like. Aiming at the defects of the traditional coal seam fracturing method, combining the knowledge and practice of domestic and foreign tectonic coal fracturing methods, the technology of implementing L-shaped horizontal well staged fracturing in a hard sandstone selected by a tectonic coal roof is an effective means for pre-pumping tectonic coal gas, perforating and staged fracturing the roof after drilling is finished, so that a well hole is communicated with the coal seam, and then a drainage and production pump is put in to reduce the pressure of the gas in the pre-pumped coal seam through ground drainage, thereby effectively reducing the gas content of the coal seam.
The ground advanced disaster control is carried out on the grouting holes for controlling the water damage area of the coal seam floor and the gas drainage holes of the coal seam or the coal roof (constructional coal); the construction process is quite mature at present in many coal mines in China, but the construction processes are implemented separately and are not well combined together for construction; the two projects are separately constructed, the investment is large, the equipment facilities are repeatedly purchased and constructed, the occupied land and the re-ploughing area are large, the equipment is disassembled, assembled and carried for many times, the waste of production materials and materials is large, and the environment pollution and damage are caused.
Disclosure of Invention
The invention aims to solve the technical problem of providing a construction process for treating a grouting hole and simultaneously using the grouting hole as a gas extraction hole in a water damage area of a coal seam floor, and effectively overcoming the defects of the prior art.
The technical scheme for solving the technical problems is as follows:
a construction process for treating grouting holes and simultaneously using the grouting holes as gas extraction holes in a water damage area of a coal seam floor comprises the following steps:
firstly, implementing a multi-branch horizontal well water damage engineering construction grouting hole for a coal seam floor confined aquifer by the ground in advance, and specifically comprising the following steps:
s1, a straight hole section: drilling a hole by adopting a drill bit with a diameter matched with the diameter, drilling to the position below the bedrock, putting a surface casing pipe, isolating and punching the lamination layer by utilizing the surface casing pipe, putting the surface casing pipe to the position of the stable bedrock, and fixing the pipe by using cement paste;
s2, two straight holes and an oblique section: drilling by adopting a drill bit with a diameter matched with the diameter, drilling until the deflecting section is finished, entering a confined aquifer of a coal seam floor, descending a technical casing of the deflecting section, fixing the casing by using cement paste, and calculating the return height of the cement paste on the hole wall;
s3, three horizontal sections: adopting a drill bit with an adaptive diameter to drill a bare hole, and horizontally drilling and grouting along the water-containing layer in a bedding and subsection manner;
s4, performing pipe cutting and drawing operation on the inclined section technical casing, wherein the pipe drawing position is at the top of the coal seam;
s5, after pipe drawing is completed, sealing the drilled hole with cement paste to a position above the coal seam suitable for gas extraction inclined hole side drilling hole forming, and waiting for setting;
step two, performing 'L' -shaped horizontal well gas drainage engineering construction on the coal seam or the top of the coal seam in advance on the ground to form a gas extraction hole, wherein the method specifically comprises the following steps:
s6, drilling a deviation section to a coal seam or a coal seam roof by secondary-opening side drilling construction, lowering an extraction deviation section casing, fixing a pipe by cement paste, and enabling the cement paste to be well-fixed and return to the closed surface layer of S5;
and S7, opening the horizontal hole section of the horizontal well for extraction by three steps, putting a casing pipe of the extraction section for extraction, fixing the pipe by cement paste, and cementing the cement paste to return to the ground surface in the extraction section.
On the basis of the technical scheme, the invention can be further improved as follows.
Further, the second step further includes: and S9, perforating the pumping section casing pipe to the downward coal seam in a unidirectional multi-section multi-cluster oriented manner, perforating the casing pipe and communicating the trajectory of the coal seam.
Further, the second step further includes: s10, carrying out the step-by-step directional fracturing technology section by section to enable the well hole to be communicated with the natural fracture of the coal seam to form a fracture channel.
The invention has the beneficial effects that: the invention can well combine the construction processes of two projects together, adopts the principle of 'one field has multiple purposes, one hole has multiple purposes and one machine has multiple purposes', uses the same equipment to complete the work content of the two projects in advance at the same well site and the same drilling hole, realizes the purposes of small and centralized occupied area, reusable field equipment and facilities, reduction of environmental pollution and damage, relatively less cost investment and the like, and achieves the green exploration construction effects of cost reduction, efficiency improvement and environmental protection.
Drawings
FIG. 1 is a construction schematic diagram of a construction process for treating grouting holes and also taking gas extraction holes in a water damage area of a coal seam floor.
Detailed Description
The principles and features of this invention are described below in conjunction with the following drawings, which are set forth by way of illustration only and are not intended to limit the scope of the invention.
Example (b): as shown in fig. 1, the construction process for treating the grouting holes of the water damage area of the coal seam floor as the gas extraction holes comprises the following steps:
step one (first stage): and the ground implements the construction grouting holes of the multi-branch horizontal well water damage treatment engineering on the coal seam floor confined aquifer in advance.
1 grouting main drilling hole is adopted in a grouting hole, and the drilling hole enters a grouting pressure-bearing water-containing layer of a coal seam floor through construction of a straight hole section and an inclined section and is horizontally drilled along the water-containing layer; after the main hole construction is finished, performing grouting construction on each branch hole, and dividing the grouting drilling hole body structure into three stages; the hole body structure and the working procedure are as follows
S1, a straight hole section: drilling a hole (hole 1) with the diameter of phi 444.5mm to 10m below bedrock, and putting a phi 339.7 multiplied by 9.65mm surface casing 2 (J55); isolating and punching the layer by the surface casing 2, and putting the layer into a stable bedrock (5 m into the complete bedrock) to fix the pipe by cement slurry (the pipe structure 3 of the fixed pipe is referred to);
s2, two straight holes and an oblique section: drilling to a hole diameter of phi 311.1mm (4 in the figure indicates the drill hole) until an inclined section is finished and enters a confined aquifer of a coal seam floor, and then lowering a technical casing 5 of the inclined section of phi 177.8 multiplied by 8.05mm (N80), performing cement paste pipe fixing, and calculating a hole wall cement paste height returning position 7 (the casing returns upwards to the coal seam top position outside the casing, so that early preparation is made for the next pipe cutting and pulling operation);
s3, three horizontal sections: bare holes with the aperture diameter of 152.4mm are drilled and grouted along the horizontal bedding layer of each branch along the water-containing layer to form a bare hole section 6;
and S4, after the construction and grouting of each branch hole are qualified and accepted, cutting and pipe drawing position 8 (the pipe drawing position is at the coal seam top position) of the phi 177.8 multiplied by 8.05mm (N80) technical casing pipe.
In order to ensure that the sleeve is pulled out smoothly, the design aperture of a hole 4 with the diameter of 311.1mm is large, one sleeve is selected at a sleeve cutting and pulling position 8 during pipe discharging, both ends of the sleeve are respectively designed into positive and negative thread types, the thread of the sleeve above the sleeve cutting and pulling position 8 is designed into a positive thread type, the thread of the sleeve below is designed into a negative thread type, the sleeve is rotated before pulling out the sleeve, and if the sleeve is opened at the sleeve cutting and pulling position 8, the sleeve is pulled out directly; if the sleeve cannot be opened, the hydraulic cutter is adopted to cut the sleeve at the position and pull up the sleeve.
S5, after pipe drawing is completed, sealing the grouting drill hole with cement paste to a hole depth position 9 needing sidetrack drilling at the second stage (hole sealing sidetrack drilling position is determined according to calculation), and waiting for setting;
step two (second stage): the ground implements an L-shaped horizontal well gas drainage engineering construction gas drainage hole on the coal seam or the top of the coal seam in advance.
The gas drainage hole is also constructed in the original grouting hole, and the principle of one-field multiple use, one-hole multiple use and one-machine multiple use is adopted; constructing a deflecting section of a side drilling point 9 at a grouting hole sealing position (a second stage side drilling point position) by cement paste, and enabling a drill hole to enter a coal seam or a coal seam roof (tectonic coal) horizontal bedding drill; after the construction of the L-shaped horizontal well is finished, putting a casing for well cementation, perforation, fracturing and other means for gas drainage, wherein the structure of a hole body of the gas drainage hole is divided into three stages; the hole body structure and the working procedures are as follows:
s6, after the first stage is finished and after waiting for setting for 7h (ensuring successful sidetracking), continuing to construct an inclined section by adopting phi 311.1mm diameter 4 directional sidetracking, drilling to a coal seam or a coal seam roof (constructional coal), putting a phi 244.5 multiplied by 8.94mm (N80) extraction inclined section casing pipe, fixing the casing pipe by cement paste, and returning the cement paste to the earth surface 10;
s7, three-opening a horizontal section 11 of a coal seam or a coal seam roof (structural coal) construction with the diameter of phi 215.9mm, drilling until the designed hole is deep, then putting a phi 139.7 multiplied by 7.72mm (P110) extraction section casing pipe, fixing the pipe by cement paste, and returning the cement paste to the earth surface 12.
After cement slurry pipe fixing and waiting solidification are finished, unidirectional multi-section multi-cluster directional perforation is carried out on the coal seam below the L-shaped horizontal hole section phi 139.7 multiplied by 7.72mm (P110) extraction section casing pipe, the casing pipe is shot, and the trajectory 13 of the coal seam is conducted.
In addition, the whole scheme also needs to adopt a step-by-step oriented fracturing technology, and the fracturing technology can effectively communicate the well hole with the natural fracture of the coal bed and increase the gas desorption rate; forming a fracture channel 14.
Finally, by adopting complete development technical means of 'pumping bridge plug packing segmentation, multi-segment multi-cluster directional perforation, segmented and step-by-step directional fracturing' and the like, the horizontal segment of the L-shaped horizontal well is always kept to be slightly inclined upwards during construction, so that drainage, depressurization and gas production are facilitated.
It should be noted that: the technology is suitable for coal seam floor water damage and gas outburst mines with underground mining coal seams with the buried depth of more than 300 meters (according to the construction experience of horizontal wells, the construction difficulty of the horizontal wells with shallow vertical depth is large, the horizontal distance is short, and the ratio of the vertical depth to the horizontal displacement is generally selected to be about 1: 2.5-1: 3 for ensuring the vertical depth deflecting section); in the first stage, a ground directional nearly horizontal bedding branch drilling group grouting technology is adopted in advance, the aquifer under pressure of the coal seam floor is mainly explored and grouting transformation is carried out, a vertical water guide channel of confined water of the coal seam floor is blocked, and the threat of floor water damage during excavation is reduced. In the second stage, an L-shaped horizontal well is constructed in the same well site and the same drilling hole in advance by using the same equipment or a coal roof (constructional coal), and is subjected to segmented fracturing transformation, so that coal bed gas is drained and stratum stress is released.
The whole scheme combines the common points of two projects of water disaster area treatment and gas extraction and the national requirements on green exploration construction and environment protection, can well combine the two project construction processes together, adopts the principle of 'one field is multi-purpose, one hole is multi-purpose, one machine is multi-purpose', and the work content of the two projects can be completed by using the same equipment in advance in the same well site and the same drilling hole, thereby realizing the purposes of less occupied area, concentration, repeated utilization of field equipment and facilities, reduction of environmental pollution and damage, relatively less cost investment and the like, achieving the effects of cost reduction, efficiency improvement and environment protection.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (3)
1. The construction process for treating the grouting holes and simultaneously using the grouting holes as gas extraction holes in the water damage area of the coal seam floor is characterized by comprising the following steps of:
firstly, implementing a multi-branch horizontal well water damage engineering construction grouting hole for a coal seam floor confined aquifer by the ground in advance, and specifically comprising the following steps:
s1, a straight hole section: drilling a hole by adopting a drill bit with a diameter matched with the diameter, drilling to the position below the bedrock, putting a surface casing pipe, isolating and punching the lamination layer by utilizing the surface casing pipe, putting the surface casing pipe to the position of the stable bedrock, and fixing the pipe by using cement paste;
s2, two straight holes and an oblique section: drilling by adopting a drill bit with a diameter matched with the diameter, drilling until the deflecting section is finished, entering a confined aquifer of a coal seam floor, descending a technical casing of the deflecting section, fixing the casing by using cement paste, and calculating the return height of the cement paste on the hole wall;
s3, three horizontal sections: adopting a drill bit with an adaptive diameter to drill a bare hole, and horizontally drilling and grouting along the water-containing layer in a bedding and subsection manner;
s4, performing pipe cutting and drawing operation on the inclined section technical casing, wherein the pipe drawing position is at the top of the coal seam;
s5, after pipe drawing is completed, sealing the drilled hole with cement paste to a position above the coal seam suitable for gas extraction inclined hole side drilling hole forming, and waiting for setting;
step two, performing 'L' -shaped horizontal well gas drainage engineering construction on the coal seam or the top of the coal seam in advance on the ground to form a gas extraction hole, wherein the method specifically comprises the following steps:
s6, drilling a deviation section to a coal seam or a coal seam roof by secondary-opening side drilling construction, lowering an extraction deviation section casing, fixing a pipe by cement paste, and enabling the cement paste to be well-fixed and return to the closed surface layer of S5;
and S7, opening the horizontal hole section of the horizontal well for extraction by three steps, putting a casing pipe of the extraction section for extraction, fixing the pipe by cement paste, and cementing the cement paste to return to the ground surface in the extraction section.
2. The construction process for treating the grouting holes of the water damage area of the coal seam floor as gas extraction holes according to claim 1, wherein the second step further comprises the following steps:
and S8, perforating the pumping section casing pipe to the downward coal seam in a unidirectional multi-section multi-cluster oriented manner, perforating the casing pipe and communicating the trajectory of the coal seam.
3. The construction process for treating the grouting holes of the water damage area of the coal seam floor as gas extraction holes according to claim 2, wherein the second step further comprises the following steps:
s9, carrying out the step-by-step directional fracturing technology section by section to enable the well hole to be communicated with the natural fracture of the coal seam to form a fracture channel.
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