CN112364519B - Large-diameter drilling parameter determination method for extracting upper corner gas - Google Patents
Large-diameter drilling parameter determination method for extracting upper corner gas Download PDFInfo
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- CN112364519B CN112364519B CN202011305461.1A CN202011305461A CN112364519B CN 112364519 B CN112364519 B CN 112364519B CN 202011305461 A CN202011305461 A CN 202011305461A CN 112364519 B CN112364519 B CN 112364519B
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F30/00—Computer-aided design [CAD]
- G06F30/20—Design optimisation, verification or simulation
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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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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F2111/00—Details relating to CAD techniques
- G06F2111/10—Numerical modelling
Abstract
A large-diameter drilling parameter determining method for extracting upper corner gas comprises the following steps: testing the air speed of an air inlet roadway of the stope face and the gas emission quantity of the stope face; collecting a rock sample at a working face top plate at an upper corner site; processing the collected rock sample into a standard coal rock test piece in a laboratory, and testing the original rock porosity, permeability and crushing expansion coefficient to obtain the crushed expansion goaf permeability; establishing a numerical calculation model of the upper corner gas concentration; and determining drilling parameters according to the numerical calculation model of the upper corner gas concentration. The invention overcomes the error of determining drilling parameters by coal mine staff depending on experience, has scientific principle, collects samples on site, then performs simulation calculation in a laboratory, has simple operation process and high accuracy of the finally determined drilling parameters, and is beneficial to popularization and application of the large-diameter drilling upper corner gas extraction technology.
Description
Technical Field
The invention belongs to the technical field of gas control, and particularly relates to a large-diameter drilling parameter determination method for extracting upper corner gas.
Background
The upper corner gas control is a heavy weight in the production process of the stoping working face, and the upper corner gas control method mainly comprises the methods of goaf buried pipe extraction, high-position drilling extraction, upper corner extraction by using a gas control roadway, ejector installation and the like, and can control the gas to a certain extent, but has certain limitations.
In recent years, the technology for extracting gas from the upper corners of the large-diameter drilling holes is applied, namely, the gas from the adjacent roadway to the working surface returns the roadway, the large-diameter drilling holes are constructed at intervals, and the gas extraction system is connected to extract gas from the upper corners of the working surface.
The gas extraction technology for the upper corners of the large-diameter drill holes realizes the large-flow and low-negative-pressure gas extraction in the goaf, and reduces the gas concentration in the upper corners. At present, the coal mine mainly determines parameters of the large-diameter drilling hole through experience, but the large-diameter drilling hole has different effects in the practical application process due to the difference of practical experience of coal mine personnel. How to accurately determine parameters such as the diameter of a large-diameter drilling hole, the pitch of the hole and the like becomes a key for popularization of the technology.
Disclosure of Invention
The invention aims to solve the problem of upper corner gas accumulation in the prior art, and provides a large-diameter drilling parameter determination method for extracting upper corner gas, which has strong operability, improves gas extraction effect, and is safer and more reliable.
In order to solve the technical problems, the invention adopts the following technical scheme: a large-diameter drilling parameter determining method for extracting upper corner gas comprises the following steps:
test stope face air inlet roadway wind speed V 1 And the gas emission quantity Q of the stope face;
secondly, acquiring a rock sample at a working surface top plate at an upper corner site by a drilling sampling method;
thirdly, processing the rock sample acquired in the step two into a standard coal rock test piece in a laboratory, and testing the original rock porosityn s Permeability ofK s Coefficient of expansion in the mean value of breakingK r ；
Porosity of crushed and expanded rocknThe method comprises the following steps:；
goaf permeability after crushing and expandingKThe method comprises the following steps:；
fourthly, establishing a numerical calculation model of the upper corner gas concentration according to the goaf permeability calculated in the third step;
and fifthly, determining drilling parameters according to a numerical calculation model of the upper corner gas concentration.
The numerical calculation model in the step (four) is as follows:
wherein:is the upper corner gas concentration; l is the drilling interval, m; r is the diameter of the borehole, m; m is M g Is the molecular weight of the gas; r is an ideal gas constant; q is the gas emission quantity of the working face; />Is a model constant; v is the tunnel wind speed of the working face; k is the goaf permeability; e is a natural constant.
The drilling parameters comprise a drilling diameter r and a drilling interval L, and the specific process of determining the drilling interval is that firstly, the drilling diameter r is set to be a certain value, and the numerical model is utilized to simulate the drilling interval L to be L respectively 1 、L 2 、L 3 And the upper corner gas concentration under the conditions of … … and Ln is a natural number, and the optimal value of the drilling interval L is determined by analyzing the upper corner gas concentration under the conditions of different drilling intervals and combining the engineering quantity, the cost and the gas extraction effect.
The specific process of determining the drilling diameter r is that under the condition that the drilling distance L is kept to be the optimal value, as can be seen from a numerical calculation model, when the drilling diameter r is increased, the value of the upper corner gas concentration is reduced, but the drilling diameter is too large, the construction drilling engineering cost is too high, and the extraction effect and the construction cost are comprehensively considered, so that the optimal value of the drilling diameter r is determined.
By adopting the technical scheme, according to the wind speed of the air inlet lane of the stope face and the gas emission quantity parameters of the stope face, the invention combines the test calculation of the rock expansion coefficient and the porosity of the goaf, establishes a numerical calculation model of the upper corner gas concentration, and the molecular weight M of the gas in the numerical calculation model g The ideal gas constant R can be directly inquired from a technical manual, the gas emission quantity Q of the working face, the wind speed v of the roadway of the working face and the permeability K of the goaf can be measured on site by an instrument, and the model constantCan be obtained by inquiring numerical simulation software; and simulating the upper corner gas concentration under the conditions of different drilling diameters, drilling intervals and the like by the parameters, so as to obtain the large-diameter drilling parameters when the upper corner gas concentration is minimum. The invention overcomes the error of determining drilling parameters by coal mine staff depending on experience, has scientific principle, collects samples on site, then performs simulation calculation in a laboratory, has simple operation process and high accuracy of the finally determined drilling parameters, and is beneficial to popularization and application of the large-diameter drilling upper corner gas extraction technology.
Drawings
FIG. 1 is a graph of upper corner gas concentration as a function of borehole spacing;
FIG. 2 is a plot of borehole diameter size versus upper corner gas concentration;
FIG. 3 is a plan view of a field layout of a large diameter borehole;
fig. 4 is a cross-sectional view A-A of fig. 3.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments.
As shown in fig. 1 to 4, the method for determining the large-diameter drilling parameters for extracting upper corner gas according to the present invention comprises the following steps:
test stope face air inlet roadway wind speed V 1 And the gas emission quantity Q of the stope face;
secondly, acquiring a rock sample at a working surface top plate at an upper corner site by a drilling sampling method;
thirdly, processing the rock sample acquired in the step two into a standard coal rock test piece in a laboratory, and testing the original rock porosityn s Permeability ofK s Coefficient of expansion in the mean value of breakingK r ；
Porosity of crushed and expanded rocknThe method comprises the following steps: ；
goaf permeability after crushing and expandingKThe method comprises the following steps:；
fourthly, establishing a numerical calculation model of the upper corner gas concentration according to the goaf permeability calculated in the third step;
and fifthly, determining drilling parameters according to a numerical calculation model of the upper corner gas concentration.
The numerical calculation model in the step (four) is as follows:
wherein:is the upper corner gas concentration; l is the drilling interval, m; r is the diameter of the borehole, m; m is M g Is the molecular weight of the gas; r is an ideal gas constant; q is the gas emission quantity of the working face; />Is a model constant; v is the tunnel wind speed of the working face; k is goaf permeabilityThe method comprises the steps of carrying out a first treatment on the surface of the e is a natural constant.
Large diameter borehole placement schematic diagrams are shown in fig. 3 and 4, and the borehole pitch and borehole diameter are determined by: firstly, setting the diameter of a drilling hole to be 300mm, and setting the gas concentration of the upper corner under the conditions that the simulated drilling hole intervals are 3 m, 4 m, 5 m, 6m, 7 m and 8 m respectively; according to the method, the upper corner gas concentration under different combination conditions of the drilling diameter and the drilling interval is simulated. And determining the diameter and the distance of the drilling holes by analyzing the gas concentration of the upper corners under the conditions of different pore diameters and different distances of the drilling holes.
The specific process is as follows:
first, the drilling interval L is determined: the drilling diameter r is determined to be 300mm, six models are built under the conditions that the drilling intervals L of the parameter simulation gas are 3 m, 4 m, 5 m, 6m, 7 m and 8 m, the upper corner gas concentration is simulated, and the effect of different drainage intervals on the upper corner gas is analyzed, as shown in figure 1.
As can be seen from fig. 1, the smaller the drill hole pitch L, the better the extraction effect, but excessively decreasing the drill hole pitch L to achieve the purpose of lowering the upper corner gas concentration increases the amount of work for constructing the drill holes. And comprehensively considering the gas extraction effect and the construction engineering quantity, and determining the gas drilling interval L to be 6m.
The borehole diameter r is then determined: five models were constructed with the borehole diameter r kept at 6m, and the simulated borehole diameters r were set to 300mm, 350mm, 400 mm, 450 mm and 500mm, respectively, and the upper corner gas extraction effect was examined for different borehole diameters r, as shown in fig. 2.
As can be seen from fig. 2, when the drilling diameter r exceeds 350mm, the upper corner gas concentration continues to decrease with increasing hole diameter, but decreases slightly, and when the drilling diameter r reaches 350mm, increasing the drilling diameter r further has little effect on further decreasing the upper corner gas concentration, and it is determined that the optimum drilling diameter r is 350mm according to the simulation result.
Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made therein without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (1)
1. A method for determining parameters of large-diameter drilling holes for extracting upper corner gas is characterized by comprising the following steps of: the method comprises the following steps:
test stope face air inlet roadway wind speed V 1 And the gas emission quantity Q of the stope face;
secondly, acquiring a rock sample at a working surface top plate at an upper corner site by a drilling sampling method;
thirdly, processing the rock sample acquired in the step two into a standard coal rock test piece in a laboratory, and testing the original rock porosity n s Permeability K s And coefficient of expansion K r ；
The porosity n of the crushed and expanded rock is as follows:
the goaf permeability K after crushing and expanding is as follows:
fourthly, establishing a numerical calculation model of the upper corner gas concentration according to the goaf permeability calculated in the third step;
fifthly, determining drilling parameters according to a numerical calculation model of the upper corner gas concentration;
the numerical calculation model in the step (four) is as follows:
wherein: η is the upper corner gas concentration; l is the drilling interval, m; r is the diameter of the borehole, m; m is M g Is the molecular weight of the gas; r is an ideal gas constant; q is the gas emission quantity of the working face; a is a model constant; v is the tunnel wind speed of the working face; k is the goaf permeability; e is a natural constant;
drilling parameter bagThe specific process of determining the drilling interval comprises the steps of firstly setting the drilling diameter r to be a certain value and simulating the drilling interval L to be L respectively by using a numerical model 1 、L 2 、L 3 The gas concentration of the upper corners under the conditions of … … and Ln, n is a natural number, and the optimal value of the drilling interval L is determined by analyzing the gas concentration of the upper corners under the conditions of different drilling intervals and combining the engineering quantity, the cost and the gas extraction effect;
the specific process of determining the drilling diameter r is that under the condition that the drilling distance L is kept to be the optimal value, as can be seen from a numerical calculation model, when the drilling diameter r is increased, the value of the upper corner gas concentration is reduced, but the drilling diameter is too large, the construction drilling engineering cost is too high, and the extraction effect and the construction cost are comprehensively considered, so that the optimal value of the drilling diameter r is determined.
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| EA200801780A1 (en) * | 2008-07-14 | 2010-02-26 | Открытое Акционерное Общество "Белгорхимпром" (Оао "Белгорхимпром") | METHOD OF UNDERGROUND DEVELOPMENT OF STONE CARBON MONEY |
| CN103821554A (en) * | 2014-03-07 | 2014-05-28 | 重庆大学 | Coal pillar-free exploitation Y-shaped venting goaf drilling hole location method |
| CN104462654A (en) * | 2014-11-11 | 2015-03-25 | 中国矿业大学 | Shallow burial coal mining earth surface interpenetrated crack distribution and air leakage characteristic judgment method |
| CN109446602A (en) * | 2018-10-15 | 2019-03-08 | 内蒙古科技大学 | A kind of Numerical Experimental Method of surface vertical borehole extraction super high seam gas |
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Inventor after: Wang Kai Inventor after: Zheng Wenxian Inventor after: Li Quanzhong Inventor after: Fu Hongwei Inventor after: Wei Wei Inventor after: Gao Tianyu Inventor after: Liu Xu Inventor after: Zhang Guifang Inventor before: Zheng Wenxian Inventor before: Wang Kai Inventor before: Li Quanzhong Inventor before: Fu Hongwei Inventor before: Wei Wei Inventor before: Gao Tianyu Inventor before: Liu Xu Inventor before: Zhang Guifang |
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Effective date of registration: 20230731 Address after: 045000 Xueyuan Road Development Zone, Yangquan, Shanxi Applicant after: SHANXI INSTITUTE OF TECHNOLOGY Address before: 045000 No.1 college, Yangquan Development Zone, Shanxi Province Applicant before: Wei Wei |
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