CN116906110A - Construction method for final hole of adjacent top plate high-position drilling site - Google Patents
Construction method for final hole of adjacent top plate high-position drilling site Download PDFInfo
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- 238000005553 drilling Methods 0.000 title claims abstract description 257
- 238000010276 construction Methods 0.000 title claims abstract description 45
- 238000000605 extraction Methods 0.000 claims abstract description 56
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK 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 OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK 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
- E21B43/30—Specific pattern of wells, e.g. optimising the spacing of wells
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- E—FIXED CONSTRUCTIONS
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- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
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Abstract
The invention relates to the technical field of gas extraction, and discloses a construction method of a final hole of an adjacent roof high-position drilling site, which comprises the following steps: s1, constructing and designing parameters of a working face goaf; s2, determining a first drilling site and a second drilling site; s3, carrying out high-level drilling construction on a top plate of the first drilling site; s4, calculating the value of the interval L of the final Kong Cengwei; s5, performing high-level drilling construction on the top plate of the second drilling site. The construction method for the final hole of the adjacent top plate high-level drilling field can more accurately determine the final Kong Cengwei interval of the two adjacent top plate high-level drilling fields, so that quantitative construction is carried out on the final Kong Cengwei interval of the two adjacent top plate high-level drilling fields, and the defects that gas extraction is discontinuous, the overall gas extraction efficiency of top plate high-level drilling holes is reduced and the gas extraction cost is greatly increased due to the fact that the conventional determination of the final Kong Cengwei interval of the two adjacent top plate high-level drilling fields is carried out empirically are overcome.
Description
Technical Field
The invention relates to the technical field of gas extraction, in particular to a construction method of a final hole of an adjacent roof high-position drilling site.
Background
The potential safety hazard of gas explosion exists in high-gas mines, and the national advocates the co-mining of coal and coal bed gas at present, so that the gas of the coal mine is changed into valuable. The traditional coal mine gas extraction method divides the coal seam gas extraction, the adjacent layer gas extraction and the goaf gas extraction from the coal seam position, and divides the pre-extraction, the side extraction and the goaf gas extraction from the extraction sequence; whether pressure relief is carried out or not can be divided into pressure relief extraction and non-pressure relief extraction; the extraction process is divided into a method of drilling extraction and roadway extraction and a method of drilling and roadway combined extraction.
The gas is extracted from the top plate high-level drilling holes by using drilling machine equipment, wherein a top plate high-level drilling field is constructed at intervals in a working surface return air gate, 6-9 top plate high-level drilling holes are generally constructed in each top plate high-level drilling field, the final hole positions of the drilling holes are located at the middle upper part of a fracture zone by constructing the top plate high-level drilling holes, and gas in the fracture zone is extracted by using the fracture zone formed after the top plate collapses, so that the gas of adjacent layers is reduced and enters a working surface goaf through the fracture zone, the trend of increasing gas emission is further restrained, the gas concentration of the working surface is reduced, and the safe production of the working surface is ensured. However, some technical problems also occur in the design and practice of high-level drilling of construction top plates, and the traditional method for determining the final Kong Cengwei interval between adjacent top plate high-level drilling sites is generally determined empirically, so that the method has no support by a certain scientific theory or ready experience and can be used as a reference, and therefore has a certain blindness. When the interval between the final Kong Cengwei of two adjacent top plate high-level drilling sites is too large, the gas in the drilling holes of the front drilling sites is attenuated, and the drilling holes of the drilling sites immediately behind the drilling sites do not play a role; however, when the interval between the final Kong Cengwei of the two adjacent top plate high-level drilling sites is too small, the drilling of the drilling sites immediately following the peak period of the gas release in the drilling sites in the front of the two adjacent top plate high-level drilling sites also plays a role, so that the limited gas can be shunted into the drilling sites of the two drilling sites to reduce the overall gas extraction efficiency of the top plate high-level drilling sites, and when the interval between the final Kong Cengwei of the two adjacent top plate high-level drilling sites is too small, the gas extraction cost is greatly increased, so that the method is neither economical nor scientific, and how to select the proper interval between the final Kong Cengwei of the two adjacent top plate high-level drilling sites becomes a technical problem which plagues the construction of the top plate high-level drilling sites.
The defects of the prior art that the final Kong Cengwei spacing between two adjacent roof high-level drilling sites is determined are as follows:
(1) The final Kong Cengwei interval between two adjacent roof high-level drilling sites in the prior art is determined empirically, when the final Kong Cengwei interval between two adjacent roof high-level drilling sites is too large, gas in drilling holes of a front drilling site is attenuated, and drilling holes of the drilling sites immediately behind the drilling sites do not play a role, so that the gas extraction effect of the roof high-level drilling holes is interrupted, and the gas extraction is discontinuous;
(2) When the interval between the final Kong Cengwei of the two adjacent top plate high-level drilling sites is too small, the drilling of the drilling sites immediately following the peak time of the gas release in the drilling sites in the front drilling sites also plays a role, so that the limited gas can be shunted into the drilling sites of the two drilling sites to reduce the overall gas extraction efficiency of the top plate high-level drilling sites, and the interval between the final Kong Cengwei of the two adjacent top plate high-level drilling sites is too small to greatly improve the gas extraction cost, so that the method is neither economical nor scientific.
Disclosure of Invention
In order to overcome the technical problems, the invention aims to provide a construction method of a final hole of an adjacent top plate high-level drilling field, wherein the method utilizes the mutual position relation of the positions of the final hole of the drilling, the crack zone and the width of the collapse zone, and utilizes a trigonometric function to accurately obtain the final Kong Cengwei interval of the two adjacent top plate high-level drilling fields, so that quantitative construction is carried out on the final Kong Cengwei interval of the two adjacent top plate high-level drilling fields.
The invention provides the following technical scheme:
a construction method of a final hole of an adjacent roof high-position drilling site comprises the following steps:
s1, carrying out the construction and parameter design of a goaf of a working face according to a masonry beam theory, wherein the goaf of the working face comprises a U-shaped return air cis groove (3), a working face cutting hole (6) and a transportation cis groove (7) which are arranged at a certain depth from the ground surface, and one side between the return air cis groove (3) and the transportation cis groove (7) is provided with the working face cutting hole (6); the stratum with the working surface facing the earth surface is sequentially provided with a collapse zone (4) and a fracture zone (5), and the second drilling site (2) is positioned in the U-shaped opening direction of the first drilling site (1); the parameter comprises the height H of the fracture zone (5) m And the height H of the collapse zone (4) l ；
S2, determining the positions of the first drilling site (1) and the second drilling site (2), and determining the horizontal distance L between the first drilling site (1) and the working surface cutting hole (6) according to the working condition of the working surface 2 The method comprises the steps of carrying out a first treatment on the surface of the Determining the position of the second drilling site (2) at a horizontal distance L from the first drilling site (1) to the side facing away from the working surface cut (6) 3 ；
S3, carrying out high-level drilling construction on a top plate of the first drilling site (1), and carrying out drilling construction of a plurality of groups of top plate high-level gas extraction with different heights on the top plate in the direction of cutting holes (6) on the working surface of the working surface from the first drilling site (1) by using a drilling machine, wherein the height of the bottom layer of drilling hole from the return air cis-slot (3) is H;
s4, calculating the value of the distance L of the final Kong Cengwei, and according to the height H of the bottommost drilling hole from the return air cis groove (3) and the distance L of the first drilling field (1) from the working surface cutting hole (6) 2 And the height H of the collapse zone (4) l Calculating the final Kong Cengwei distance L between the top plate high-level drilling hole of the first drilling site (1) and the top plate high-level drilling hole of the second drilling site (2);
s5, carrying out high-level drilling construction on the top plate of the second drilling site (2), and carrying out high-level drilling construction on the top plate of the second drilling site (2) according to the value of the final Kong Cengwei interval L.
According to some embodiments, the first drilling site (1) is at a horizontal distance L from a working surface cut (6) of the working surface 2 And the horizontal distance L between the first drilling site (1) and the second drilling site (2) 3 Is based onAnd determining the rated power of the construction drilling machine and the optimal construction drilling hole depth of the outgoing drilling machine.
According to some embodiments, in step S4, according to the following formula:
L＝L 2 -(L 2 *H l )/H (3)
obtaining the L value.
According to some embodiments, the height H of the fracture zone (5) of the face goaf of the masonry beam theory in step S1 m Height H of the collapse zone (4) l The calculation formula of (2) is as follows:
H m ＝[100∑M/(4.7∑M+19)]+2.2 (1)
H 1 ＝[100∑M/(1.6∑M+3.6)]+5.6 (2)
wherein: h m The height of the caving belt is expressed in meters; h l The height of the water guiding fracture zone is unit meter; Σm is the seam thickness, in meters.
Compared with the prior art, the invention has the following beneficial effects:
the construction method for the final Kong Cengwei interval of the adjacent top plate high-level drilling sites overcomes the defect that the conventional determination of the final Kong Cengwei interval of the two adjacent top plate high-level drilling sites is empirically carried out, when the final Kong Cengwei interval of the two adjacent top plate high-level drilling sites is too large, gas in drilling holes of the front drilling sites is attenuated, the drilling holes of the subsequent drilling sites do not play a role, thus the interruption of the gas extraction effect of the top plate high-level drilling holes can be caused, and the gas extraction is discontinuous, so that a more accurate construction method is provided for the determination of the final Kong Cengwei interval of the two adjacent top plate high-level drilling sites.
The method solves the problems that when the interval between the final Kong Cengwei of two adjacent roof high-level drilling sites is too small, the drilling holes of the drilling sites immediately following the peak time of gas release in the drilling holes of the front drilling sites also play a role, so that limited gas can be shunted into the drilling holes of the two drilling sites to lower the overall gas extraction efficiency of the roof high-level drilling holes, and the interval between the final Kong Cengwei of the two adjacent roof high-level drilling sites is too small to greatly improve the gas extraction cost, so that the method is neither economical nor scientific, and a novel method for determining the interval between the final Kong Cengwei of the adjacent roof high-level drilling sites is explored, so that scientific basis and theoretical guidance are provided for the design and construction of the roof high-level drilling holes.
Drawings
Fig. 1 is a top view of a drill site provided by the present invention defining the final Kong Cengwei spacing of adjacent roof high drill sites.
Fig. 2 is a schematic diagram of a final Kong Cengwei pitch section of a high-level drilling field with adjacent top plates according to the present invention.
Fig. 3 is a flow chart of a construction method of a final Kong Cengwei interval of an adjacent roof high-level drilling site.
The reference numerals in the drawings are:
a first drilling site 1; a second drilling site 2; return air cis-slot 3; collapse of the belt 4; a slit band 5; a working face cutting hole 6; and a transportation gate 7.
Detailed Description
The present invention will be described in detail with reference to the following examples and drawings, but it should be understood that the examples and drawings are only for illustrative purposes and are not intended to limit the scope of the present invention in any way. All reasonable variations and combinations that are included within the scope of the inventive concept fall within the scope of the present invention.
In the gas exploitation process, the final hole position of the adjacent roof high-position drilling site needs to be determined, the position of the collapse zone and the position of the crack zone are calculated according to the masonry beam theory of Qian Minggao yards, then a large amount of air enters due to the existence of huge holes in the collapse zone, when the final hole position of the roof high-position gas extraction drilling hole enters the collapse zone from the crack zone, the concentration of the extracted gas can be drastically reduced because of the large amount of air entering the collapse zone, and therefore, the final hole position of the roof high-position drilling hole of the second drilling site needs to be exactly in the middle-upper gas concentration gathering zone of the crack zone when the final hole position of the roof high-position drilling hole of the second drilling site needs to be exactly in the time, so that the continuity of gas extraction can be ensured, and the traditional drilling design cannot be accurately calculated, and the drilling hole is provided with blindness and disorder.
The invention provides a practical and effective determination method, which is a method for solving the practical problem and is explored for solving the design of high-position gas extraction drilling holes on a coal mine roof, the method has theoretical support and precise calculation, the calculation has strong purposefulness and innovation, and the method has good practical value and good guiding significance and application value for on-site gas extraction and safe production of working faces.
The invention is further described below with reference to the accompanying drawings.
Example 1
In the embodiment, the working face of the yellow-white Roots coal mine 020913 of the national energy group Usea energy Limited responsible company is taken as a research object, the yellow-white Roots coal mine of the Shenhua Usea energy company is a high-gas mine, the 020913 working face is positioned in the south wing area of the 922 down-hill mining area, and the vertical depth from the ground surface is about 143-289 m;020913 working face north is a development roadway such as 922 track downhill, 9211 belt mountain, 923 return air downhill and the like; the eastern part is a well Tian Ziran boundary until reaching a reverse fault, the south part is a well field south boundary protection coal pillar, the west part is a 020911 working face which is already recovered, the 020913 working face is a trend longwall coal mining method, and the working face trend length 1255m is the lengths of a transportation cis-slot and a return air cis-slot; the inclined length 165m of the working face is the cutting length of the working face, the coal mining height of the working face is 2.8m, the coal seam inclination angle is 5 degrees, the working face adopts a comprehensive mechanical coal mining process, and the roof is controlled by a full caving method.
As shown in fig. 1, the 020913 working face cut holes 6 and 020913 transportation gate 7 and the return air gate 3 are arranged on a plane, the working face cut hole 6 of 020913 is at the leftmost end in fig. 1, and the transportation gate 7 and the return air gate 3 are respectively located at two sides of the working face cut hole 6 and are mutually communicated with the working face cut hole 6 to form a U-shaped structure. Wherein, the 020913 transportation gate 7 is paved with a transfer conveyor and a scraper conveyor which are used for transporting coal and pedestrians and supplying fresh air to the working face cut 6; 020913 return air channel 3 is used for discharging the polluted air flow formed by working face cutting 6 and is used for transportation equipment and materials; the 020913 working face cutting hole 6 is used for placing a coal mining machine, a scraper conveyor and a hydraulic support and is responsible for coal recovery.
The top plate high-level drilling is started to be carried out on the return air cis-slot 3 of the 020913 working surface, as shown in fig. 1, 9 top plate high-level drilling holes 8 are respectively arranged in the first drilling field 1 and the second drilling field 2, 3 groups of drilling holes are respectively arranged in each drilling field, the uppermost group of drilling holes are 7#, 8#, 9# drilling holes, the middle group of drilling holes are 4#, 5#, 6# drilling holes, the lowermost group of drilling holes are 1#, 2#, 3# drilling holes, the advancing direction of the working surface cutting holes 6 is the direction indicated by arrows in fig. 1, and the longitudinal section is shown in fig. 2.
The construction method of the final hole of the adjacent top plate high-level drilling site shown in fig. 3 specifically comprises the following steps:
the first step, according to the calculation formula of a goaf fracture zone and a caving zone of a theoretical working face of a masonry beam of a Qian Minggao yard, the calculation formula is as follows:
H m ＝[100∑M/(4.7∑M+19)]+2.2 (1)
H 1 ＝[100∑M/(1.6∑M+3.6)]+5.6 (2)
wherein: h m Is the height (m) of the collapse zone; h l The height (m) of the water guiding fracture zone; Σm is the seam thickness (M); from the working face recovery geologic description, it is known that the coal seam is 2.84M thick, Σm=2.84
And (3) obtaining: h m ＝10.98m≈11m
H l ＝40.47m≈40m。
As shown in fig. 2, the 020913 working face cutting hole is located at the leftmost side, the return air gate 3 is located at one end of the working face, as the working face cutting hole 6 is continuously advanced from the leftmost side to the right, a caving zone 4 is formed above the return air gate 3, the fracture zone 5 is located above the caving zone 4, the working face cutting hole 6 is located at the leftmost side, the first drilling field 1 is located at the horizontal right side of the working face cutting hole 6, the second drilling field 2 is located at the horizontal right side of the first drilling field 1, a plurality of groups of holes to be opened are distributed in the height range of the fracture zone 5, generally a plurality of holes are arranged in one drilling field, in this embodiment, three groups of holes are arranged in total in the first drilling field 1, each group of holes is 3 holes, 9 holes are arranged in total, the first group of holes are 1#, 2# and 3# holes, the second group of holes are 4#, 5# and 6# holes, and the third group of holes are 7#, 8# and 9# holes, respectively, and in this embodiment, three groups of holes are arranged in the first drilling field 1The first drilling site 1 and the second drilling site 2 are respectively constructed in the return air guide slot 3, and in addition, the height H of the caving belt 4 of the goaf of the 020913 working surface can be known through the previous calculation m About 11m, height H of fracture zone 5 l About 40m. Selecting the drill site distance L between the first drill site 1 and the second drill site 2 according to the actual condition of the return air cis-slot 3 of the 020913 working surface of the gas extraction drill 3 Distance L of first drilling site 1 from 020913 working face cut 6 =70 m 2 ＝80m。
L 2 And L 3 The horizontal distance from the first drilling site 1 to the working surface cutting hole 6 and the horizontal distance from the second drilling site 2 to the first drilling site 1 are determined in advance according to the rated power of the drilling machine, the factory leaving of the drilling machine is the optimal construction drilling hole depth and other factors, L 2 And L 3 The determination method is prior art and will not be described in detail here.
It should be noted that, in the strict sense of the first drilling site 1 and the second drilling site 2, the drilling site is not a point but a space with the length, width and height of 5×5×3m, and of course, the parameter is not fixed and is designed according to the mining height of the coal seam on the working surface, the size performance dimension of the drilling machine for drilling the top plate high-level drilling is designed, the construction of the top plate high-level drilling is performed in the space, the hole opening positions of all the drilling holes are in the drilling sites, but all the constructed top plate high-level drilling holes form a long cylindrical hole in the coal seam or the rock stratum, the length of the cylindrical hole cannot be infinitely long, and the cylindrical hole finally has a bottom, which is the final hole position of the top plate high-level drilling. Because the space of the drilling site is too small relative to the whole 020913 working surface cut hole and 020913 return air gate, the space is often replaced by a point on the coal mine engineering drawing, which is a method used conventionally on the coal mine engineering drawing.
According to the masonry beam theory of Qian Minggao yard, the top plate high-position drilling is constructed so that the final hole position of the drilling is located at the middle upper part of the fracture zone, and gas in the fracture zone is extracted by utilizing the fracture zone formed after the top plate collapses, so that the final hole positions of the 1# drilling, the 2# drilling and the 3# drilling of the first drilling site 1 are positions 24m upwards from the bottom plate of the return air cis-slot 3 of the 020913 working surface; the final hole positions of the No. 4, no. 5 and No. 6 drill holes are 34m upwards away from the bottom plate of the return air cis-slot 3; the final hole positions of the holes # 7, # 8 and # 9 are 44m upwards from the bottom plate of the return air duct 3, wherein 24m,34m and 44m are determined according to the prior art. The end Kong Cengwei of the drill hole at the second drill site 2 and the end Kong Cengwei of the drill hole at the first drill site 1 are both on the same horizontal line corresponding to the hole number. But how to ensure that when the final hole position of the drill hole of the first drilling site 1 is accompanied with the extraction pushing of the working surface, and the drill hole just enters the caving zone 4 from the fracture zone (note: because a large amount of oxygen exists in the caving zone, the concentration of gas extracted from the high-position drill hole of the top plate in the caving zone can be drastically reduced, thereby reducing the extraction efficiency), the drill hole of the second drilling site 2 just enters the optimal gas extraction state at the middle-upper part of the fracture zone 5 so as to keep the second drilling site 2 to smoothly take over the first drilling site 1, and the continuous and efficient operation of the gas extraction of the high-position drill hole of the top plate is a technical problem which afflicts the safe and efficient extraction of the site.
As shown in FIG. 2, if the final Kong Cengwei spacing L between adjacent roof high-level drill sites is to be determined more accurately, only L is required 1 Then the first drilling site 1 is used for cutting the horizontal distance L from the working surface to the 6 2 To subtract L 1 The specific value of the final Kong Cengwei interval L of the adjacent top plate high-level drilling sites can be accurately obtained. The final hole drilling position refers to the position of the rock layer at the extreme end of each top plate high-level drilling hole, namely the hole bottom, which is an indispensable parameter mark of each drilling hole, and the final Kong Cengwei distance between two adjacent top plate high-level drilling sites is accurately calculated by utilizing the mutual position relation of the final hole drilling position, the width of the fracture zone 5 and the collapse zone 4 and then utilizing a trigonometric function.
Secondly, setting a first drilling site 1 at a position with a distance of 80m from a working face cutting hole 6 of 020913 in a return air cis-slot 3 of a 020913 working face;
thirdly, constructing 9 top plate high-position gas extraction holes with the aperture phi of 94mm on a top plate in the direction of a working surface cutting hole 6 of a first drilling field 1 to 020913 by using a ZDY6000LD type drilling machine, wherein the 9 holes are left-ended right above the working surface cutting hole 020913, and the final hole positions of the holes 1#, 2#, 3# are positions 24m upwards from a bottom plate of a return air cis-slot 3 of 020913; the final hole positions of the No. 4, no. 5 and No. 6 drill holes are 34m upwards from the bottom plate of the return air cis-slot 3 of 020913; the final hole positions of the 7# drilling, the 8# drilling and the 9# drilling are 44m upwards from the bottom plate of the return air cis-slot 3 of 020913;
fourthly, marking the collapse zone 4, the fracture zone 5 and interlayer boundary lines thereof in the top plate right above the 020913 working face design working face, and marking the vertical distances of each layering to be 11m and 40m respectively, wherein intersecting points are necessarily formed between the top plate high-level drilling holes of the first drilling site 1 and the boundary lines of the collapse zone 4 and the fracture zone 5 (namely, the position lines of the top plate 11m right above the 020913 working face). The 9 top plate high-position gas extraction holes of a drill site are connected with the gas extraction pipelines of the return air cis-slots 3 of 020913 in a centralized manner for gas extraction, so that as long as the final hole positions of a group of top plate high-position gas extraction holes enter the collapse zone 4, the gas concentration in the gas extraction pipelines of the whole drill site of the drill site can be reduced, so that the gas concentration of the whole top plate high-position gas extraction system can be reduced, and accordingly, only the intersection points of the 1# drilling holes, 2# drilling holes and 3# drilling holes of the left first drill site 1 and the boundary line of the collapse zone 4 and the crack zone 5 can be found. After finding this intersection, a perpendicular is drawn from the return air duct 3 of 020913 upward through this intersection.
Fifthly, arranging a second drilling site 2 in a return air cis-slot 3 of 020913 at the position 70m on the right side of the first drilling site 1, constructing 9 top plate high-position gas extraction drilling holes with the aperture phi of 94mm on top plates in the cutting direction of a 020913 working surface in the second drilling site 2, wherein the 9 drilling holes are left-ended on a vertical line passing through an intersection point of the return air cis-slot 3 of 020913, where the 1# drilling holes, the 2# drilling holes and the 3# drilling holes of the first drilling site and the dividing line of the fracture zone are intersected, and the 1# drilling holes, the 2# drilling holes and the 3# drilling holes of the second drilling site are also positioned at a distance of 24m upwards from a bottom plate of the return air cis-slot 3 of 020913; the final positions of the No. 4, no. 5 and No. 6 holes are also 34m upwards from the bottom plate of the return air cis-slot 3 of 020913; the final positions of the # 7, # 8 and # 9 holes are also 44m upwards from the bottom plate of the return air duct 3 of 020913.
And sixthly, the included angles between the No. 1, no. 2 and No. 3 drill holes of the first drilling site 1 and the horizontal plane are alpha.
As can be seen from the figure 1 of the drawings,thus, tan -1 0.3＝16.7°＝α。
As can also be seen from figure 1,therefore->
I.e. according to the following formula:
L＝L 2 -(L 2 *H l )/H (3)
obtaining the L value.
As can be seen from fig. 1, the final Kong Cengwei pitch l=l2-l1=80 m-37 m=43 m of the adjacent roof high-level drilling sites. Therefore, the distance between the final hole position of the drill hole of the first drill site 1 and the final hole position of the drill hole of the adjacent second drill site 2 is reasonable by 43m, at this time, when the final hole position of the drill hole of the first drill site 1 reaches the collapse zone, the final hole position of the drill hole of the second drill site 2 just reaches the middle upper part of the fracture zone to reach the optimal gas extraction position, so that the gas quantity of the drill hole of the front drill site is ensured to be rapidly attenuated, the gas extraction effect of the drill hole of the drill site immediately after the drilling hole is rapidly increased, the gas extraction efficiency of the high-position drill hole of the top plate is improved, and the safe and efficient production of the working surface is ensured.
And finally, determining the final Kong Cengwei interval L of the adjacent top plate high-level drilling sites by implementing the steps, and performing top plate high-level drilling construction of the second drilling site 2.
According to the construction method, the distance between the final stages Kong Cengwei of the adjacent top plate high-level drilling sites is determined to be a certain rule and can be circulated, and the method is a novel method for determining the distance between the final stages Kong Cengwei of the adjacent top plate high-level drilling sites, which is suitable for actual requirements on site.
The specific requirements of construction are as follows:
(1) Drilling construction design must be performed by a professional before construction.
(2) Construction must be performed by professional engineering technicians, professional construction teams, and professional drilling equipment, and related personnel must be trained in a professional manner and then allowed to go on duty.
(3) The directional drilling machine is used for construction as much as possible, so that the final hole position of the drilled hole can reach the designed final hole position according to the requirement, and good conditions are created for subsequent calculation.
(4) The azimuth line, the drilling inclination angle and the hole position are required to be calibrated by a special person during construction, the special person performs hole inspection, and hole inspection records are made.
(5) The special technician performs hole sealing and records, and the special technician performs data arrangement, comparison and analysis and sends out observation and calculation report materials.
According to the construction method for determining the distance between the terminals Kong Cengwei of the adjacent top plate high-level drilling sites, which is provided by the embodiment, the distance between the terminals Kong Cengwei of the adjacent top plate high-level drilling sites is determined, and a good gas extraction effect is achieved, compared with the gas extraction effect of implementing top plate high-level drilling on the adjacent return air cis-slots of 020911 without using the construction method provided by the embodiment in the prior art, the gas extraction concentration is improved by 12.7% under the same gas extraction negative pressure, and a good use effect is achieved.
The above examples are only preferred embodiments of the present invention, and the scope of the present invention is not limited to the above examples. All technical schemes belonging to the concept of the invention belong to the protection scope of the invention. It should be noted that modifications and adaptations to the present invention may occur to one skilled in the art without departing from the principles of the present invention and are intended to be within the scope of the present invention.
Claims (4)
1. A construction method of a final hole of an adjacent roof high-position drilling site comprises the following steps:
s1, carrying out the structure and parameter design of a goaf of a working face according to a masonry beam theory, wherein the goaf of the working face comprises a working with a certain depth from the ground surfaceThe device comprises a U-shaped return air cis-slot (3), a working face cut-hole (6) and a transportation cis-slot (7), wherein one side between the return air cis-slot (3) and the transportation cis-slot (7) is provided with the working face cut-hole (6); the stratum with the working surface facing the earth surface is sequentially provided with a collapse zone (4) and a fracture zone (5), and the second drilling site (2) is positioned in the U-shaped opening direction of the first drilling site (1); the parameter comprises the height H of the fracture zone (5) m And the height H of the collapse zone (4) l ；
S2, determining the positions of the first drilling site (1) and the second drilling site (2), and determining the horizontal distance L between the first drilling site (1) and the working surface cutting hole (6) according to the working condition of the working surface 2 The method comprises the steps of carrying out a first treatment on the surface of the Determining the position of the second drilling site (2) at a horizontal distance L from the first drilling site (1) to the side facing away from the working surface cut (6) 3 ；
S3, carrying out high-level drilling construction on a top plate of the first drilling site (1), and carrying out drilling construction of a plurality of groups of top plate high-level gas extraction with different heights on the top plate in the direction of cutting holes (6) on the working surface of the working surface from the first drilling site (1) by using a drilling machine, wherein the height of the bottom layer of drilling hole from the return air cis-slot (3) is H;
s4, calculating the value of the distance L of the final Kong Cengwei, and according to the height H of the bottommost drilling hole from the return air cis groove (3) and the distance L of the first drilling field (1) from the working surface cutting hole (6) 2 And the height H of the collapse zone (4) l Calculating the final Kong Cengwei distance L between the top plate high-level drilling hole of the first drilling site (1) and the top plate high-level drilling hole of the second drilling site (2);
s5, carrying out high-level drilling construction on the top plate of the second drilling site (2), and carrying out high-level drilling construction on the top plate of the second drilling site (2) according to the value of the final Kong Cengwei interval L.
2. The method for constructing the final hole of the adjacent roof high-level drilling site according to claim 1, wherein the method comprises the following steps: the first drilling site (1) is at a horizontal distance L from a working surface cutting hole (6) of the working surface 2 And the horizontal distance L between the first drilling site (1) and the second drilling site (2) 3 The best construction drilling hole depth is based on rated power of the construction drilling machine and delivery of the drilling machineAnd (5) determining.
3. The method for constructing the final hole of the adjacent roof high-level drilling site according to claim 1, wherein the method comprises the following steps: in step S4, according to the following formula:
L＝L 2 -(L 2 *H l )/H (3)
obtaining the L value.
4. The method for constructing the final hole of the adjacent roof high-level drilling site according to claim 1, wherein the method comprises the following steps: height H of the fracture zone (5) of the working face goaf of the masonry beam theory in step S1 m Height H of the collapse zone (4) l The calculation formula of (2) is as follows:
H m ＝[100∑M/(4.7∑M+19)]+2.2 (1)
H 1 ＝[100∑M/(1.6∑M+3.6)]+5.6 (2)
wherein: h m The height of the caving belt is expressed in meters; h l The height of the water guiding fracture zone is unit meter; Σm is the seam thickness, in meters.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN117473792A (en) * | 2023-12-22 | 2024-01-30 | 天津矿智科技有限公司 | Method, system, equipment and medium for optimally designing gas extraction hole |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN117473792A (en) * | 2023-12-22 | 2024-01-30 | 天津矿智科技有限公司 | Method, system, equipment and medium for optimally designing gas extraction hole |
| CN117473792B (en) * | 2023-12-22 | 2024-03-12 | 天津矿智科技有限公司 | Method, system, equipment and medium for optimally designing gas extraction hole |
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