CN114278361A - Coal mine gas extraction borehole fault state judgment method - Google Patents
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Abstract
The invention relates to a method for judging a fault state of a coal mine gas extraction drill hole, and belongs to the field of coal mine exploitation. The method comprises the following steps: before an extraction fault state judgment model is established, determining a factor set U, an evaluation set V, a weight set W and a single factor evaluation matrix R which influence the gas extraction borehole fault; before the extraction fault state judgment model is established, the extraction flow of the extraction drill hole of the intact coal seam is compared with the theoretical extraction flow, and the deviation index I is determinedd(ii) a Before the extraction fault state judgment model is established, acquiring an extraction flow curve of an intact coal seam extraction borehole, and determining a gas extraction flow change characteristic index Iq(ii) a And determining the comprehensive evaluation vector B as W multiplied by R, establishing an extraction fault state judgment model, and judging the gas extraction borehole fault state and the fault reason. The invention determines the extraction flowDeviation index and change characteristic index, help staff accurately discover problem drilling and the quick pertinence solution problem.
Description
Technical Field
The invention belongs to the field of coal mining, and relates to a method for judging a fault state of a coal mine gas extraction drill hole.
Background
The existing coal seam permeability increasing technology is various, the air permeability of the coal seam can be greatly improved, and the extraction of coal seam gas is promoted. However, the coal seam gas extraction mode is single, and mainly comprises the steps of constructing a cross-layer drill hole or a local layer drill hole on a target coal seam, and connecting a negative pressure extraction system to extract gas after hole sealing. A large number of field practices show that the integrity and the sealing performance of the extraction drill hole are key factors for determining the extraction effect. Due to the influences of poor physical and mechanical properties of coal rocks, high stratum water content and the like, the problems of hole collapse, hole blockage, water accumulation in holes and the like are easily caused in the gas extraction drill hole, so that the gas extraction drill hole is in an invalid extraction state, and the final extraction effect is weakened. Meanwhile, the pressure relief of the roadway and the extraction drill hole can cause the development of cracks around the extraction drill hole, and the problems of poor hole sealing effect of the extraction drill hole, gas leakage and the like can be caused due to the fact that site workers do not standardize hole sealing construction of the extraction drill hole, and the extraction efficiency and the utilization of coal seam gas are affected. However, whether the extraction borehole has a fault or not is difficult to rapidly judge under the current technical conditions, the problems encountered by the extraction borehole cannot be rapidly and pertinently solved, and high-quality coal seam gas extraction is difficult to guarantee. Therefore, the research and development of the method can prolong the life cycle of the gas extraction drill hole, improve the extraction effect of coal bed gas, and assist in gas disaster prevention and control of the high-gas low-permeability coal bed and exploitation of the coal bed gas.
Disclosure of Invention
In view of the above, the invention aims to provide a method for judging a fault state of a coal mine gas extraction drill hole.
In order to achieve the purpose, the invention provides the following technical scheme:
a coal mine gas extraction borehole fault state judgment method comprises the following steps:
s11: before an extraction fault state judgment model is established, determining a factor set U, an evaluation set V, a weight set W and a single factor evaluation matrix R which influence the gas extraction borehole fault;
s12: before the extraction fault state judgment model is established, the extraction flow of the extraction drill hole of the intact coal seam is compared with the theoretical extraction flow, and the deviation index I is determinedd；
S13: before the extraction fault state judgment model is established, acquiring an extraction flow curve of an intact coal seam extraction borehole, and determining a gas extraction flow change characteristic index Iq；
S14: factor set U, evaluation set V, and deviation index I obtained in S11, S12, and S13dAnd gas extraction flow change characteristic index IqAnd determining the comprehensive evaluation vector B as W multiplied by R, establishing an extraction fault state judgment model, and judging the gas extraction borehole fault state and the fault reason.
Optionally, the basis for establishing the factor set U and the evaluation set V is a fuzzy comprehensive evaluation method.
Optionally, the deviation index IdThe theoretical extraction flow in the determination basis is calculated by a solid-gas coupling dynamic model of coal bed gas migration.
Optionally, the gas extraction flow variation characteristic index IqIs determined based on the sliding average line, the deviation rate and the dispersion rate of the gas flow signal time sequence.
Optionally, the determination of the extraction borehole fault factor set U, the evaluation set V, the weight set W, and the single-factor evaluation matrix R in the method includes the following steps:
step S101: establishing a factor set, namely a set composed of various factors influencing the evaluation object, and expressing that U is equal to { U ═ U1,u2,u3,...,un}; wherein the element uiAre several contributing factors, i ═ 1,2, …, n;
step S102: establishing an evaluation set, namely a set of evaluation results possibly made by the evaluation object, and expressing V as { V ═ V }1,v2,v3,...,vmWherein the element vjFor several possible judgments madeAs a result, j ═ 1,2, …, m;
step S103: establishing a weight set, and giving different weight sets W according to the importance degree of each element in the factor set U aiming at the importance degree of each element in the factor set U, wherein W is a fuzzy subset on the factor set U and is expressed as W ═ W { (W)1,w2,w3···,wn}；
Step S104: establishing a single factor evaluation set, and evaluating a certain factor u in the factor setiCarrying out evaluation, and evaluating any element v in the evaluation setjDegree of membership r ofijThen element uiThe judgment result is the judgment set of Ri＝{ri1,ri2,ri3,···,rim}。
Optionally, the determined deviation index IdThe method comprises the following steps:
step S201: selecting a complete gas extraction borehole in an application area of the extraction borehole fault state judgment method, monitoring the real-time gas extraction flow of the gas extraction borehole, and obtaining a flow change curve;
step S202: drawing a theoretical gas extraction flow curve according to a solid-gas coupling dynamic model of the gas migration of the underground coal seam and the gas geological condition of the application area in the formula 1 d;
step S203: determining a deviation early warning value delta to be 0.2, and determining and correcting according to the occurrence stability of gas and the fluctuation degree of the gas extraction flow actually measured on site;
step S204: determining deviation index I of measured flow and theoretical flowdAnd the actually measured flow corresponding to the drilling gas extraction flow at the time t is qtTheoretical value of QtIf the deviation early warning value is delta, the deviation index Id(x) The method comprises the following specific steps:
optionally, determining the gas extraction flow change characteristic index IqThe method comprises the following steps:
step S301: obtaining a flow variation curve according to the step S201, determining a sliding average value A (n) of a sliding average line in n time pointst；
Step S302: according to the moving average A (n)tGas extraction flow x at t momenttDetermining a deviation ratio Y (n) at time tt；
Step S303: determining the dispersion rate V (m) at the t moment according to the average value mu of the gas extraction flow in the time length m at the t momentt；
Step S304: respectively assigning values to the sliding average value, the deviation rate and the dispersion rate, wherein if no abnormal fluctuation occurs, the value is assigned to be 0, and if one item has abnormal fluctuation, the value is assigned to be 1;
step S305: and assigning alpha, beta and gamma by setting a sliding average value, a deviation rate and a dispersion rate, and setting y as alpha + beta + gamma, and setting y as {0,1,2,3}, so as to obtain a gas extraction flow change characteristic index Iq(y)；
Optionally, the establishing of the extraction fault state judgment model and the judgment of the gas extraction borehole fault state and the fault reason include the following steps:
step S401: from a single-factor matrix RiAnd forming a multi-factor comprehensive judgment R, namely:
R＝{R1,R2,...,Rn}T (7)
step S402: multiplying the factor weight set W and the evaluation matrix R according to the fuzzy matrix to obtain a fuzzy comprehensive evaluation index biAnd fuzzy comprehensive evaluation set B, i ═ 1,2, …, m, i.e.:
B＝WR＝{b1,b2,,b3,...,bm} (8)
step S403: calculating a simplified fuzzy comprehensive evaluation set B to obtain a deviation index I of the measured flow and the theoretical valuedAnd gas extraction flow change characteristic index IqThe operation state I of the gas extraction drill hole is a function expression of a dependent variable as an independent variable:
I(x,y)＝w1Id(x)+w2Iq(y) (9)
step S404: according to different evaluation modes for w1,w2Performing different assignments, establishing a gas extraction borehole operation state fault index I, and judging semantic levels of fault state possibility of an extraction borehole, wherein the levels comprise 3 levels of 'no fault', 'possible fault' and 'fault';
step S405: and judging the possibility and the state of the fault state of the gas extraction drill hole according to the fault index I of the running state of the gas extraction drill hole.
The invention has the beneficial effects that: according to the invention, the actual gas extraction effect and the theoretical gas extraction effect of the target coal seam are analyzed, the deviation index and the change characteristic index of the extraction flow of the target coal seam are determined, and the judgment model of the fault state of the extraction drill hole is established based on the fuzzy comprehensive judgment method, so that the workers are assisted to accurately find the problem drill hole and quickly solve the problem in a targeted manner, the life cycle of the extraction drill hole is prolonged, and the gas disaster prevention and control of the high-gas low-permeability coal seam and the exploitation of the coal seam gas are ensured.
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.
Drawings
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 for establishing a fault judgment model of an extraction borehole in the invention;
FIG. 2 is a flow chart of single factor evaluation in the present invention;
FIG. 3 is a flow chart of gas extraction flow deviation index calculation in the invention;
FIG. 4 is a flow chart of gas extraction flow variation characteristic index calculation in the invention;
FIG. 5 is a flow chart of a gas extraction fault state judgment model in the invention.
Detailed Description
The embodiments of the present invention are described below with reference to specific embodiments, and other advantages and effects of the present invention will be easily understood by those skilled in the art from the disclosure of the present specification. The invention is capable of other and different embodiments and of being practiced or of being carried out in various ways, and its several details are capable of modification in various respects, all without departing from the spirit and scope of the present invention. It should be noted that the drawings provided in the following embodiments are only for illustrating the basic idea of the present invention in a schematic way, and the features in the following embodiments and examples may be combined with each other without conflict.
Wherein the showings are for the purpose of illustrating the invention only and not for the purpose of limiting the same, and in which there is shown by way of illustration only and not in the drawings in which there is no intention to limit the invention thereto; 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.
The same or similar reference numerals in the drawings of the embodiments of the present invention correspond to the same or similar components; in the description of the present invention, it should be understood that if there is an orientation or positional relationship indicated by terms such as "upper", "lower", "left", "right", "front", "rear", etc., based on the orientation or positional relationship shown in the drawings, it is only for convenience of description and simplification of description, but it is not an indication or suggestion that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and therefore, the terms describing the positional relationship in the drawings are only used for illustrative purposes, and are not to be construed as limiting the present invention, and the specific meaning of the terms may be understood by those skilled in the art according to specific situations.
Referring to fig. 1 to 5, a method for determining a fault state of a coal mine gas extraction drill hole includes the following steps:
s11: before an extraction fault state judgment model is established, determining a factor set U, an evaluation set V, a weight set W and a single factor evaluation matrix R which influence the gas extraction borehole fault;
s12: before the extraction fault state judgment model is established, the extraction flow of the extraction drill hole of the intact coal seam is compared with the theoretical extraction flow, and the deviation index I is determinedd；
S13: before the extraction fault state judgment model is established, acquiring an extraction flow curve of an intact coal seam extraction borehole, and determining a gas extraction flow change characteristic index Iq；
S14: factor set U, evaluation set V, and deviation index I obtained in S11, S12, and S13dCharacteristic index I of gas extraction flow changeqAnd determining the comprehensive evaluation vector B as W multiplied by R, establishing an extraction fault state judgment model, and judging the gas extraction borehole fault state and the fault reason.
S101: establishing a factor set, wherein the factor set is composed of 2 judgment factors of deviation of measured flow and theoretical value and gas extraction flow change characteristics, and can be expressed as U-U ═ U1,u2}；
S102: establishing an evaluation set, wherein the evaluation result of the extraction drilling comprises drilling fault operation and drilling normal operation, and can be represented as V ═ I, II };
s103: establishing a weight set, wherein the factor set consists of 2 factors, so that the weight set W is W ═ W1,w2And satisfy w1+w2＝1；
S104: a single factor evaluation set is established, and since U, V consists of 2 factors, R isi＝(ri1,ri2) And i is (1,2), simultaneously establishing a membership function relation of each factor in U to the evaluation set V, and expressing U by adopting a formula method2The membership function of the evaluation set of { deviation of measured flow from theoretical value } is:
u2the membership function of the evaluation set of { gas extraction flow variation characteristics } is as follows:
the available single factor evaluation matrix is:
s201: selecting a complete gas extraction borehole in an application area of the extraction borehole fault state judgment method, monitoring the real-time gas extraction flow of the gas extraction borehole, and obtaining a flow change curve;
s202: drawing a theoretical gas extraction flow curve according to a solid-gas coupling dynamic model (formula 13) of gas migration of an underground coal seam and the geological condition of gas in an application area;
s203: determining a deviation early warning value delta, which is generally 0.2, and determining and correcting according to the occurrence stability of gas and the fluctuation degree of the gas extraction flow actually measured on site;
s204: determining deviation index I of measured flow and theoretical flowdAnd the actually measured flow corresponding to the drilling gas extraction flow at the time t is qtTheoretical value of QtIf the deviation early warning value is delta, the deviation index Id(x) The method comprises the following specific steps:
s301: obtaining a flow change curve according to S201 to determine a sliding average value A (n) of a sliding average line in n timet；
S302: according to the moving average A (n)tGas extraction flow x at t momenttDetermining a deviation ratio Y (n) at time tt；
S303: determining the dispersion rate V (m) at the t moment according to the average value mu of the gas extraction flow in the time length m at the t momentt；
S304: respectively assigning values to the sliding average value, the deviation rate and the dispersion rate, wherein if no abnormal fluctuation occurs, the value is assigned to be 0, and if one item has abnormal fluctuation, the value is assigned to be 1;
s305: and assigning alpha, beta and gamma by setting the sliding average value, the deviation rate and the dispersion rate, and setting y as alpha + beta + gamma, and setting y as {0,1,2 and 3}, so as to obtain the gas extraction flow change characteristic index Iq(y)。
S401: from a single-factor matrix RiAnd forming a multi-factor comprehensive judgment R, namely:
R＝{R1,R2}T (19)
s402: multiplying the factor weight set W and the evaluation matrix R according to the fuzzy matrix to obtain a fuzzy comprehensive evaluation index bi(i ═ 1,2, …, m) and fuzzy comprehensive panel B, i.e.:
B＝WR＝{b1,b2}＝{w1,w2}{R1,R2}T (20)
s403: substituting formula 12 for formula 20 to give:
calculating simplified fuzzy comprehensive evaluation set B to obtain deviation index I of measured flow and theoretical valuedAnd gas extraction flow change characteristic index IqThe operation state I of the gas extraction drill hole is a function expression of a dependent variable as an independent variable:
I(x,y)＝w1Id(x)+w2Iq(y) (22)
s404: according to different evaluation modes for w1,w2And performing different assignments, establishing a gas extraction borehole operation state fault index I, judging the semantic level of the fault state possibility of the extraction borehole, and setting the levels to be 3 levels of 'no fault', 'possible fault' and 'fault', wherein the levels correspond to the possible fault states.
TABLE 1 fuzzy comprehensive evaluation model evaluation of extraction borehole fault operation probability index
| Serial number | Level of presence of failure | Probability evaluation index |
| 1 | Without failure | 0.0～0.5 |
| 2 | Is likely to fail | 0.5～0.8 |
| 3 | Fault of | 0.8～1.0 |
S405: and judging the possibility and the state of the fault state of the gas extraction drill hole according to the fault index I of the running state of the gas extraction drill hole.
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 (8)
1. A coal mine gas extraction borehole fault state judgment method is characterized by comprising the following steps: the method comprises the following steps:
s11: before an extraction fault state judgment model is established, determining a factor set U, an evaluation set V, a weight set W and a single factor evaluation matrix R which influence the gas extraction borehole fault;
s12: before the extraction fault state judgment model is established, extracting flow and theoretical extraction of the extraction drill hole of the intact coal seamComparing the flow rates to determine a deviation index Id；
S13: before the extraction fault state judgment model is established, acquiring an extraction flow curve of an intact coal seam extraction borehole, and determining a gas extraction flow change characteristic index Iq；
S14: factor set U, evaluation set V, and deviation index I obtained in S11, S12, and S13dAnd gas extraction flow change characteristic index IqAnd determining the comprehensive evaluation vector B as W multiplied by R, establishing an extraction fault state judgment model, and judging the gas extraction borehole fault state and the fault reason.
2. The method for judging the fault state of the coal mine gas extraction drill hole according to claim 1, characterized by comprising the following steps: the basis for establishing the factor set U and the evaluation set V is a fuzzy comprehensive evaluation method.
3. The method for judging the fault state of the coal mine gas extraction drill hole according to claim 1, characterized by comprising the following steps: the deviation index IdThe theoretical extraction flow in the determination basis is calculated by a solid-gas coupling dynamic model of coal bed gas migration.
4. The method for judging the fault state of the coal mine gas extraction drill hole according to claim 1, characterized by comprising the following steps: the gas extraction flow change characteristic index IqIs determined based on the sliding average line, the deviation rate and the dispersion rate of the gas flow signal time sequence.
5. The method for judging the fault state of the coal mine gas extraction drill hole according to claim 1, characterized by comprising the following steps: the method for determining the extraction drilling fault factor set U, the evaluation set V, the weight set W and the single-factor evaluation matrix R comprises the following steps:
s101: establishing a factor set, namely a set composed of various factors influencing the evaluation object, and expressing that U is equal to { U ═ U1,u2,u3,...,un}; wherein the element uiIs a plurality of shadowsResponse factor, i ═ 1,2, …, n;
s102: establishing an evaluation set, namely a set of evaluation results possibly made by the evaluation object, and expressing V as { V ═ V }1,v2,v3,...,vmWherein the element vjJ-1, 2, …, m for several possible judgments;
s103: establishing a weight set, and giving different weight sets W according to the importance degree of each element in the factor set U aiming at the importance degree of each element in the factor set U, wherein W is a fuzzy subset on the factor set U and is expressed as W ═ W { (W)1,w2,w3···,wn}；
S104: establishing a single factor evaluation set, and evaluating a certain factor u in the factor setiCarrying out evaluation, and evaluating any element v in the evaluation setjDegree of membership r ofijThen element uiThe judgment result is the judgment set of Ri＝{ri1,ri2,ri3,···,rim}。
6. The method for judging the fault state of the coal mine gas extraction drill hole according to claim 1, characterized by comprising the following steps: the determined deviation index IdThe method comprises the following steps:
s201: selecting a complete gas extraction borehole in an application area of the extraction borehole fault state judgment method, monitoring the real-time gas extraction flow of the gas extraction borehole, and obtaining a flow change curve;
s202: drawing a theoretical gas extraction flow curve according to a solid-gas coupling dynamic model of the gas migration of the underground coal seam and the gas geological condition of the application area in the formula 1 d;
s203: determining a deviation early warning value delta to be 0.2, and determining and correcting according to the occurrence stability of gas and the fluctuation degree of the gas extraction flow actually measured on site;
s204: determining measured and theoretical flowDeviation index IdAnd the actually measured flow corresponding to the drilling gas extraction flow at the time t is qtTheoretical value of QtIf the deviation early warning value is delta, the deviation index Id(x) The method comprises the following specific steps:
7. the method for judging the fault state of the coal mine gas extraction drill hole according to claim 1, characterized by comprising the following steps: determining the gas extraction flow change characteristic index IqThe method comprises the following steps:
s301: obtaining a flow change curve according to S201 to determine a sliding average value A (n) of a sliding average line in n timet；
S302: according to the moving average A (n)tGas extraction flow x at t momenttDetermining a deviation ratio Y (n) at time tt；
S303: determining the dispersion rate V (m) at the t moment according to the average value mu of the gas extraction flow in the time length m at the t momentt；
S304: respectively assigning values to the sliding average value, the deviation rate and the dispersion rate, wherein if no abnormal fluctuation occurs, the value is assigned to be 0, and if one item has abnormal fluctuation, the value is assigned to be 1;
s305: let sliding mean, deviation ratio and distanceAnd assigning values of alpha, beta and gamma to the scattering rate, and setting y as alpha + beta + gamma, and setting y as {0,1,2,3}, thereby obtaining a gas extraction flow change characteristic index Iq(y)；
8. The method for judging the fault state of the coal mine gas extraction drill hole according to claim 1, characterized by comprising the following steps: the method for establishing the extraction fault state judgment model and judging the gas extraction borehole fault state and fault reason comprises the following steps of:
s401: from a single-factor matrix RiAnd forming a multi-factor comprehensive judgment R, namely:
R＝{R1,R2,...,Rn}T (7)
s402: multiplying the factor weight set W and the evaluation matrix R according to the fuzzy matrix to obtain a fuzzy comprehensive evaluation index biAnd fuzzy comprehensive evaluation set B, i ═ 1,2, …, m, i.e.:
B＝WR＝{b1,b2,,b3,...,bm} (8)
s403: calculating a simplified fuzzy comprehensive evaluation set B to obtain a deviation index I of the measured flow and the theoretical valuedAnd gas extraction flow change characteristic index IqThe operation state I of the gas extraction drill hole is a function expression of a dependent variable as an independent variable:
I(x,y)＝w1Id(x)+w2Iq(y) (9)
s404: according to different evaluation modes for w1,w2Performing different assignments, establishing a gas extraction borehole operation state fault index I, and judging semantic levels of fault state possibility of an extraction borehole, wherein the levels comprise 3 levels of 'no fault', 'possible fault' and 'fault';
s405: and judging the possibility and the state of the fault state of the gas extraction drill hole according to the fault index I of the running state of the gas extraction drill hole.
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