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CN113033008B - Method for evaluating uniform pressure relief effect of horizontal joint cutting of bedding drilling - Google Patents

Method for evaluating uniform pressure relief effect of horizontal joint cutting of bedding drilling Download PDF

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CN113033008B
CN113033008B CN202110349957.7A CN202110349957A CN113033008B CN 113033008 B CN113033008 B CN 113033008B CN 202110349957 A CN202110349957 A CN 202110349957A CN 113033008 B CN113033008 B CN 113033008B
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张永将
徐遵玉
赵旭生
刘怀付
牛心刚
陆占金
李成成
袁本庆
杨慧明
季飞
易恩兵
刘永三
国林东
王中华
徐军见
李帅
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CCTEG Chongqing Research Institute Co Ltd
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Abstract

The invention belongs to the technical field of coal mine gas extraction, and discloses a bedding drilling horizontal joint-cutting uniform pressure relief effect evaluation method which is simple and convenient to operate and high in practicability, and comprises the following steps: collecting the coal density and the original crustal stress of a coal bed before bedding drilling horizontal cutting construction, and counting the axial slot segment number of the drilling hole and the radial slot frequency of a single-segment axial slot in the bedding drilling horizontal slot cutting construction, and the slot length, the slot thickness and the slag discharge amount of a horizontal slot formed by a single radial slot; calculating the seam depth and the seam depth standard deviation of the horizontal slit groove; then calculating the coal reserve and the slag rate within the control range of the total times of drilling and slotting; then, the cutting ground stress of the coal seam after the bedding drilling horizontal cutting construction is obtained, and the ground stress increment is calculated; and finally, the uniform pressure relief effect evaluation of the horizontal cutting seam of the drilled hole is realized by judging whether the depth of the gap, the standard difference of the depth of the gap, the slag yield and the ground stress increment all reach or exceed the set index critical threshold value.

Description

Method for evaluating uniform pressure relief effect of horizontal joint cutting of bedding drilling
Technical Field
The invention belongs to the technical field of coal mine gas extraction, and particularly relates to a method for evaluating uniform pressure relief effect of a horizontal joint of bedding drilling.
Background
In coal mine excavation engineering, bedding drilling and slotting are adopted to uniformly increase the permeability and relieve the pressure so as to prevent and control dynamic disasters such as coal and gas outburst, rock burst and the like, and a certain effect is achieved. However, the method has obvious limitations, for example, accidents such as outburst induction and roadway collapse still occur in local areas of some mines after pressure relief and permeability improvement measures are taken, so that the effect is poor, the coal seam cannot be completely subjected to uniform pressure relief and permeability improvement, and safe and efficient production of a working face cannot be fundamentally guaranteed. In addition, the conventional measure for uniformly increasing the permeability and relieving the pressure of the bedding drill hole and the cutting seam is to evaluate the outburst prevention effect from the gas extraction effect, but does not evaluate the uniformity and the pressure relief effect implemented by the measure.
Disclosure of Invention
In view of the above, the present invention aims to provide a method for evaluating a uniform pressure relief effect of a horizontal kerf of a bedding drill hole, which evaluates the uniformity and the pressure relief effect of measures.
In order to achieve the purpose, the invention provides the following technical scheme:
the invention provides a method for evaluating uniform pressure relief effect of a horizontal joint of a bedding drilling hole, which comprises the following steps:
step 1), collecting coal density rho and original crustal stress sigma of a coal bed before bedding drilling horizontal cutting construction0；
Step 2), counting the axial slotting segment number n of the drill hole in the bedding drill hole horizontal joint cutting construction1And the radial slotting times n of the single-segment axial slotting2The length L of a slit of a horizontal slit cutting groove formed by single radial slit cutting and the slag discharge amount q;
step 3), obtaining the thickness a of the gap of the horizontal slit groove;
step 4), calculating the gap depth R of the horizontal slit groove as follows:
Figure BDA0003002136070000011
step 5) calculating the gap depth of the horizontal slit grooveStandard deviation of degree SRComprises the following steps:
Figure BDA0003002136070000012
wherein R isiIs a single value of the seam depth of the horizontal slit-cutting groove,
Figure BDA0003002136070000013
is the average value of the seam depth of the horizontal slit groove, n1n2I is more than or equal to 1 and less than or equal to n for the total times of drilling and slotting1n2And taking a natural number;
step 6), calculating the coal reserve T and the slag yield eta within the control range of the total times of drilling and slotting, wherein the coal reserve T and the slag yield eta are respectively as follows:
Figure BDA0003002136070000021
Figure BDA0003002136070000022
step 7), obtaining cutting ground stress sigma of the coal seam after bedding drilling horizontal cutting construction1And calculating the increment delta sigma of the ground stress as follows:
Δσ＝|σ1-σ0|；
step 8), judging whether the uniformity, slag rate eta and crustal stress increment delta sigma of the horizontal joint-cutting slot reach or exceed respective set index critical thresholds, and if so, judging that the uniform pressure relief effect of the horizontal joint-cutting of the bedding drilling hole is effective; otherwise, it is invalid.
Further, the original ground stress σ in step 1)0Cutting ground stress σ in step 7)1And obtaining the product by a stress relief method or a stress recovery method.
Further, the thickness a of the gap in the step 3) is obtained by using a drilling peeping instrument.
Further, the horizontal kerf uniformity in step 8) comprises a seam depth average
Figure BDA0003002136070000024
Standard deviation of depth of sum gap SR。
Further, average value of gap depth
Figure BDA0003002136070000023
The index critical threshold value of (1) m; the standard deviation S of the gap depthRThe index critical threshold value of (2) is +/-0.15 m.
Further, the index critical threshold of the slag yield η in step 8) is 2.0%.
Further, the index critical threshold of the crustal stress increment Δ σ in the step 8) is the original crustal stress | σ020-80% of |.
The invention has the beneficial effects that: the method for evaluating the uniform pressure relief effect of the horizontal seam cutting of the bedding drilling hole realizes the evaluation of the uniform degree and the pressure relief effect implemented by measures, has the advantages of simplicity, convenience in operation, high reliability and strong practicability, provides a new evaluation mode for evaluating the uniform permeability increasing and pressure relief effect of the bedding drilling hole cutting seam, and is favorable for establishing a new standard for evaluating the uniform permeability increasing and pressure relief effect of the bedding drilling hole cutting seam in the field.
Additional advantages, objects, and features of the invention will be set forth in part in the description which follows and in part will become apparent to those having ordinary skill in the art upon examination of the following or may be learned from practice of the invention. The objectives and other advantages of the invention may be realized and attained by the means of the instrumentalities and combinations particularly pointed out hereinafter.
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For the purposes of promoting a better understanding of the objects, aspects and advantages of the invention, reference will now be made to the following detailed description taken in conjunction with the accompanying drawings in which:
FIG. 1 is a flow chart of the method for evaluating the uniform pressure relief effect of a horizontal joint of bedding drilling;
FIG. 2 is a schematic view of uniform pressure relief of a bedding drilled horizontal kerf of the present invention.
Description of reference numerals: 1 is a coal bed; 2, drilling; and 3, a horizontal slit cutting groove.
Detailed Description
The present invention will be further described with reference to the following embodiments. Wherein the showings are for the purpose of illustration only and are shown by way of illustration only and not in actual form, and are not to be construed as limiting the present patent; to better illustrate the embodiments of the present invention, some parts of the drawings may be omitted, enlarged or reduced, and do not represent the size of an actual product; it will be understood by those skilled in the art that certain well-known structures in the drawings and descriptions thereof may be omitted.
As shown in fig. 1-2, the basic principle of the method for evaluating the uniform pressure relief effect of the horizontal joint of the bedding drilling hole, which is simple and convenient to operate and strong in practicability, is as follows: firstly, collecting the coal density and the original ground stress of a coal bed 1 before bedding drilling horizontal cutting construction, and counting the number of axial slotting sections of a drilling hole 2 and the radial slotting times of a single-section axial slotting in bedding drilling horizontal slotting construction, and the length, thickness and slag yield of a horizontal slot 3 formed by a single radial slotting; calculating the seam depth and the seam depth standard deviation of the horizontal slit groove; then calculating the coal reserve and the slag rate within the control range of the total times of drilling and slotting; then, the cutting ground stress of the coal seam 1 after the bedding drilling horizontal cutting construction is obtained, and the ground stress increment is calculated; and finally, the evaluation of the uniform pressure relief effect of the horizontal cutting seam of the drilling hole is realized by judging whether the depth of the seam, the standard difference of the depth of the seam, the slag yield and the ground stress increment reach or exceed a set index critical threshold value.
The specific implementation process comprises the following steps:
step 1), collecting coal density rho and original crustal stress sigma of coal bed 1 before bedding drilling horizontal cutting construction0；
Step 2), counting the number n of axial slotting segments of the drill hole 2 in the bedding drill hole horizontal joint cutting construction1(n in the example)15) and the number n of radial cuts of a single axial cut2(n in the examples)24) and the slot length L (fixed) of the horizontal kerf 3 formed by a single radial slotValue) and slag discharge q (constant value); wherein, the horizontal lancing grooves 3 formed by the single radial slotting are symmetrically arranged, namely the slag output q is the sum of the two symmetrically arranged horizontal lancing grooves 3 formed by the single radial slotting;
step 3), acquiring the gap thickness a of the water outlet horizontal cutting gap groove by a drilling peeping instrument;
step 4), calculating the gap depth R of the horizontal kerf slot 3 according to the coal density rho of the coal bed 1, the gap length L, the slag discharge amount q and the gap thickness a of the horizontal kerf slot 3 as follows:
Figure BDA0003002136070000031
step 5), calculating the standard deviation S of the depth of the gap of the horizontal slit groove 3RComprises the following steps:
Figure BDA0003002136070000032
wherein R isiIs a single value of the seam depth of the horizontal slit-cutting groove,
Figure BDA0003002136070000041
is the average value of the depth of the horizontal slit, n1n2The total times of drilling and slotting (5 x4 ═ 20), i is more than or equal to 1 and less than or equal to n1n2And taking a natural number;
step 6), cutting the slit length L and the average value of the slit depth of the slit groove 3 according to the horizontal direction
Figure BDA0003002136070000042
Coal density rho of coal bed 1, axial slot segment number n of drill hole 21Calculating the coal reserve T and the slag yield eta in the control range of the total times of the drilling and slotting, wherein the coal reserve T and the slag yield eta are respectively as follows:
Figure BDA0003002136070000043
Figure BDA0003002136070000044
step 7), obtaining cutting ground stress sigma of the coal seam 1 after bedding drilling horizontal cutting construction1And calculating the corresponding ground stress increment delta sigma as:
Δσ＝|σ1-σ0|；
wherein the cutting ground stress σ1The stress relief method or the stress recovery method is adopted for obtaining the stress, and the stress relief method and the stress recovery method are common absolute ground stress measurement methods, wherein the stress recovery method is mainly suitable for measuring the main stress on the main plane;
step 8), judging the uniformity of the horizontal cutting seam (including the average value of the seam depth)
Figure BDA0003002136070000045
And standard deviation of gap depth SR) Whether the slag yield eta and the ground stress increment delta sigma reach or exceed respective set index critical thresholds or not is judged, and if yes, the uniform pressure relief effect of the horizontal joint cutting of the bedding drilling is judged to be effective; otherwise, it is invalid. And average value of gap depth
Figure BDA0003002136070000046
The index critical threshold value of (1) m; standard deviation of gap depth SRThe index critical threshold value of (2) is +/-0.15 m; the index critical threshold value of the slag yield eta is 2.0 percent; the index critical threshold value of the ground stress increment delta sigma is the original ground stress | sigma020% -80% of |; namely, it is
Figure BDA0003002136070000047
η≥2.0％，20％|σ0|≤Δσ≤80％|σ0If the four indexes reach or exceed the respective corresponding index critical thresholds, the uniform pressure relief effect of the horizontal joint cutting of the bedding drilling hole is judged to be effective; otherwise, it is invalid.
Finally, the above embodiments are only intended to illustrate the technical solutions of the present invention and not to limit the present invention, and although the present invention has been described in detail with reference to the preferred embodiments, it will be understood by those skilled in the art that modifications or equivalent substitutions may be made on the technical solutions of the present invention without departing from the spirit and scope of the technical solutions, and all of them should be covered by the claims of the present invention.

Claims (7)

1. A method for evaluating the uniform pressure relief effect of a horizontal joint of a bedding drill hole is characterized by comprising the following steps:
step 1), collecting coal density rho and original crustal stress sigma of a coal bed (1) before bedding drilling horizontal cutting construction0；
Step 2), counting the number n of axial slot segments of the drill hole (2) in the bedding drill hole horizontal joint cutting construction1And the radial slotting times n of the single-segment axial slotting2The length L of a slit of a horizontal slit groove (3) formed by single radial slitting and the slag discharge amount q;
step 3), obtaining the thickness a of the gap of the horizontal lancing groove;
step 4), calculating the gap depth R of the horizontal slit groove as follows:
Figure FDA0003002136060000011
step 5), calculating the standard deviation S of the depth of the horizontal slit grooveRComprises the following steps:
Figure FDA0003002136060000012
wherein R isiIs a single value of the seam depth of the horizontal slit-cutting groove,
Figure FDA0003002136060000013
is the average value of the seam depth of the horizontal slit groove, n1n2I is more than or equal to 1 and less than or equal to n for the total times of drilling and slotting1n2And taking a natural number;
step 6), calculating the coal reserve T and the slag yield eta within the control range of the total times of drilling and slotting, wherein the coal reserve T and the slag yield eta are respectively as follows:
Figure FDA0003002136060000014
Figure FDA0003002136060000015
step 7), obtaining cutting ground stress sigma of the coal seam after bedding drilling horizontal cutting construction1And calculating the earth stress increment delta sigma as:
Δσ＝|σ1-σ0|；
step 8), judging whether the uniformity, slag rate eta and crustal stress increment delta sigma of the horizontal joint-cutting slot reach or exceed respective set index critical thresholds; if so, judging that the uniform pressure relief effect of the horizontal joint of the bedding drilling is effective; otherwise, it is invalid.
2. The method for evaluating the uniform pressure relief effect of the horizontal kerfs drilled in the bedding layer according to claim 1, wherein the original crustal stress σ in the step 1) is0The cutting ground stress σ in step 7)1And obtaining the product by a stress relief method or a stress recovery method.
3. The method for evaluating the uniform pressure relief effect of the horizontal seam cutting of the bedding drill hole according to claim 1, wherein the gap thickness a in the step 3) is obtained by a drilling peep gauge.
4. The method of evaluating the uniform pressure relief of a bedding drill horizontal kerf as recited in claim 1, wherein the horizontal kerf uniformity in step 8) comprises an average slot depth value
Figure FDA0003002136060000016
And standard deviation of gap depth SR。
5. The method of claim 4 wherein the average value of the slot depth is used to evaluate uniform pressure relief effect of horizontal lancing of a bedding borehole
Figure FDA0003002136060000021
The index critical threshold value of (1) m; the standard deviation S of the gap depthRThe index critical threshold value of (2) is +/-0.15 m.
6. The method for evaluating the uniform pressure relief effect of horizontal slitting of the bedding drill hole according to claim 1, wherein the index critical threshold value of the slag yield η in the step 8) is 2.0%.
7. The method for evaluating the uniform pressure relief effect of horizontal kerfing in bedding drilling according to claim 1, wherein the index critical threshold value of the crustal stress increment Δ σ in step 8) is the original crustal stress | σ |020-80% of |.
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