CN-121639040-B - Coal seam gas extraction effective radius dynamic evaluation system based on porous linkage coupling

CN121639040BCN 121639040 BCN121639040 BCN 121639040BCN-121639040-B

Abstract

The invention provides a coal seam gas extraction effective radius dynamic evaluation system based on porous linkage coupling, which relates to the technical field of coal mine safety engineering and physical analysis, according to the invention, the extraction impedance coefficient, the porous linkage coupling coefficient and the dynamic effective radius correction coefficient are constructed by synchronously acquiring and standardizing the multisource parameters such as the negative pressure of the extraction orifice, the gas flow, the gas concentration, the extraction response time delay, the original gas pressure of the coal bed, the hole site space information and the like, and are respectively compared and evaluated with corresponding thresholds. When the evaluation result is abnormal, triggering a self-adaptive regulation strategy aiming at the negative pressure, the time sequence and the proportion of the single-hole and multi-hole collaborative extraction, and reevaluating after adjustment, so as to realize dynamic correction and closed-loop optimization of the effective extraction radius and improve the accuracy of coal seam gas extraction range evaluation and the safety and stability of the operation of the extraction system.

Inventors

CUI GUANGYONG
YANG QIANG
HAN CHENGKAI
CHANG BAOPING
LI YUNPENG
WEI WEI

Assignees

陕西长武亭南煤业有限责任公司

Dates

Publication Date: 20260508
Application Date: 20260202

Claims (10)

1. Coal seam gas extraction effective radius dynamic evaluation system based on porous linkage coupling, its characterized in that includes: the data acquisition module is configured to synchronously acquire multisource physical parameters related to the extraction action range in the coal seam gas porous extraction process, and acquire extraction orifice negative pressure original data, extraction gas flow original data, extraction gas concentration original data, extraction response time delay data and space coordinate information of the coal seam original gas pressure data and extraction holes; The data processing module is configured to perform unified time stamp alignment, outlier identification and elimination processing on the acquired data and establish a standard data set; the extraction action impedance evaluation module is configured to acquire an average negative pressure value of an extraction orifice and an attenuation rate of extraction gas flow based on a standard data set, calculate and acquire an extraction action impedance coefficient, and compare and analyze the extraction action impedance coefficient with a preset extraction action impedance threshold value; The multi-hole linkage coupling analysis module is configured to calculate and acquire a multi-hole linkage coupling coefficient based on the average extraction negative pressure difference between adjacent extraction holes, the gas concentration change rate difference and the space distance between the extraction holes, and perform comparison analysis with a preset multi-hole linkage coupling threshold; The porous linkage coupling coefficient is obtained by obtaining the average extraction negative pressure value of the adjacent ith extraction hole in a preset time window And average extraction negative pressure value of the jth extraction hole in a preset time window Rate of change over time of gas concentration in the ith extraction hole And a rate of change of gas concentration of the jth extraction hole over time Combining the spatial distance between the ith extraction hole and the jth extraction hole And the original gas pressure P0 of the coal bed, after dimensionless treatment, calculating and obtaining a porous linkage coupling coefficient, and recording the porous linkage coupling coefficient as LDOX, wherein the formula is as follows: wherein a1, a2 and a3 represent weight coefficients; The dynamic effective radius evaluation module is configured to construct a dynamic effective radius correction coefficient by acquiring a porous linkage coupling coefficient mean value and a space partition index, and compare and evaluate the dynamic effective radius correction coefficient with a preset dynamic effective radius correction threshold value; the dynamic effective radius correction coefficient is obtained by the method that the average value of the porous linkage coupling coefficient of the ith extraction hole is obtained And space partition index Combining the change rate of the gas concentration of the ith extraction hole along with time After dimensionless treatment, calculating and obtaining a dynamic effective radius correction coefficient, namely Rd, and adopting the following formula: where s1, s2, and s3 represent weight coefficients.
2. The dynamic evaluation system for the effective radius of coal seam gas extraction based on porous linkage coupling according to claim 1 is characterized in that the data acquisition module comprises a negative pressure extraction flow acquisition unit, a gas concentration response time acquisition unit and a coal seam original state space information acquisition unit; The negative pressure extraction flow acquisition unit is used for monitoring the extraction intensity change of each extraction hole under the coal seam gas multi-hole extraction working condition in real time, and acquiring the original negative pressure value of the extraction hole opening in real time by installing a negative pressure sensor at the hole opening position of each extraction hole; The gas concentration response time acquisition unit is used for monitoring the gas release response characteristic in the coal seam gas extraction process in real time, acquiring an original value of the extracted gas concentration in real time by installing a gas concentration sensor at the outlet of the extraction hole or at the tail end of the extraction pipeline, and acquiring an extraction response time delay value by synchronously recording the negative pressure change time of the extraction hole and the time of the significant change of the gas concentration or the extraction flow; The system comprises a coal bed original state space information acquisition unit, a drilling test position or a historical exploration point, a gas pressure test unit, a historical geological measurement data acquisition unit and an underground measurement system, wherein the coal bed original state space information acquisition unit is used for monitoring basic occurrence conditions of a coal bed in an extraction area in real time, acquiring the original gas pressure of the coal bed by carrying out gas pressure test at the drilling test position or the historical exploration point or calling the historical geological measurement data, and acquiring space coordinate information of extraction holes by measuring all the extraction holes through the underground measurement system.
3. The dynamic evaluation system for the effective radius of coal seam gas extraction based on porous linkage coupling according to claim 1 is characterized in that the data processing module is used for performing time synchronization processing on time sequence data of a negative pressure original value of an extraction orifice, an original value of extracted gas flow and an original value of extracted gas concentration by adopting a unified time stamp alignment mode, performing filtering processing on mutation data generated by instantaneous interference and communication abnormality of a sensor by adopting an abnormal value identification and rejection mode, and establishing a standard data set.
4. The dynamic evaluation system for the effective radius of coal-bed gas extraction based on multi-hole linkage coupling according to claim 1, wherein the extraction impedance evaluation module comprises a single-hole extraction intensity parameter extraction unit, a first calculation unit and a first analysis unit; The single-hole extraction intensity parameter extraction unit is used for extracting an original value of the extraction gas flow of an ith extraction hole by extracting an original value of the negative pressure of the ith extraction hole in a standard data set and adopting an arithmetic average algorithm to obtain an average negative pressure value of the hole in an extraction stable stage; The first calculation unit is used for calculating and obtaining the extraction action impedance coefficient by adopting a weighted linear comprehensive algorithm after dimensionless treatment by combining the obtained average negative pressure value of the orifice in the extraction stable stage and the gas flow attenuation rate of the ith extraction orifice and the original gas pressure of the coal bed and the extraction response time delay value of the ith extraction orifice.
5. The dynamic evaluation system for coal seam gas extraction effective radius based on porous linkage coupling of claim 4, wherein the first analysis unit is configured to obtain a first evaluation result by presetting an extraction impedance threshold and comparing an extraction impedance coefficient with the extraction impedance threshold, and comprises: When the extraction impedance coefficient is less than or equal to the extraction impedance threshold, the current extraction impedance of the extraction hole is in a controllable range, and continuous monitoring is performed; When the extraction impedance coefficient > the extraction impedance threshold value of the extraction hole, the extraction impedance of the current extraction hole exceeds a controllable range, the risk that the effective action of the extraction negative pressure on the coal body is insufficient, the gas release speed is not matched with the extraction intensity or the extraction influence range is limited exists is indicated, a first early warning instruction is triggered, a first strategy is generated, the single-hole enhanced extraction strategy is implemented on the current extraction hole, the extraction negative pressure parameter of the corresponding extraction hole is incrementally adjusted by 5% -15%, the extraction duration is prolonged and adjusted by 10% -20%, and after adjustment, the extraction negative pressure is recalculated until the extraction impedance coefficient is less than or equal to the extraction impedance threshold value.
6. The dynamic evaluation system for the effective radius of coal seam gas extraction based on porous linkage coupling according to claim 1, wherein the porous linkage coupling analysis module comprises an inter-pore coupling characteristic parameter extraction unit, a second calculation unit and a second analysis unit; The inter-hole coupling characteristic parameter extraction unit is used for extracting an i-th extraction hole negative pressure original value and an adjacent j-th extraction hole negative pressure original value in a standard data set, acquiring an average extraction negative pressure value of the adjacent i-th extraction hole in a preset time window and an average extraction negative pressure value of the adjacent j-th extraction hole in the preset time window by adopting an arithmetic average algorithm, extracting an extraction gas concentration original value of the i-th extraction hole and an extraction gas concentration original value of the j-th extraction hole in the standard data set, processing a change trend of the gas concentration along with time by adopting a time gradient calculation mode, acquiring a change rate of the gas concentration of the i-th extraction hole along with time and a change rate of the gas concentration of the j-th extraction hole along with time by calculating a ratio of the gas concentration change quantity of the adjacent sampling time to the time interval, and acquiring a space distance between the i-th extraction hole and the j-th extraction hole by adopting a space distance inverse calculation mode based on space coordinate information of the extraction holes.
7. The system for dynamically evaluating the effective radius of coal seam gas extraction based on porous linkage coupling according to claim 6, wherein the second calculation unit is used for calculating and obtaining the porous linkage coupling coefficient by combining the obtained average extraction negative pressure value of the adjacent ith extraction hole in a preset time window and the average extraction negative pressure value of the jth extraction hole in the preset time window, the change rate of the gas concentration of the ith extraction hole and the change rate of the gas concentration of the jth extraction hole with time and the spatial distance between the ith extraction hole and the jth extraction hole and the original gas pressure of the coal seam after dimensionless treatment.
8. The dynamic evaluation system for coal seam gas extraction effective radius based on porous linkage coupling of claim 6, wherein the second analysis unit is configured to obtain a second evaluation result by presetting a porous linkage coupling threshold and comparing and analyzing a porous linkage coupling coefficient with the porous linkage coupling threshold, and comprises: When the porous linkage coupling coefficient is more than or equal to the porous linkage coupling threshold value, the linkage coupling relationship between adjacent extraction holes is qualified, and the negative pressure disturbance and the gas migration behavior between the holes form effective superposition and are continuously monitored; When the multi-hole linkage coupling coefficient is smaller than the multi-hole linkage coupling threshold value, the linkage coupling relationship between adjacent extraction holes is unqualified, negative pressure disturbance among holes and gas migration behavior do not form a synergistic effect, risks of insufficient utilization of multi-hole extraction resources and effective radius evaluation distortion exist, a second early warning instruction is triggered, a second strategy is generated, inter-hole cooperative adjustment is conducted, 10% -30% time dislocation adjustment is conducted on start-stop time sequences of the adjacent extraction holes, 5% -20% gradient adjustment is conducted on extraction negative pressure differences of the adjacent extraction holes, 10% -25% optimization correction is conducted on hole pitch configuration parameters, calculation is conducted again until the multi-hole linkage coupling coefficient is larger than or equal to the multi-hole linkage coupling threshold value, and an effective input parameter set is established and transmitted to a dynamic effective radius evaluation module.
9. The dynamic evaluation system for the effective radius of coal-bed gas extraction based on porous linkage coupling according to claim 1, wherein the dynamic effective radius evaluation module comprises an extraction response space difference feature extraction unit, a third calculation unit and a third analysis unit; The extraction response space difference characteristic extraction unit is used for carrying out statistical treatment on the porous linkage coupling coefficient corresponding to the adjacent j extraction hole with a space adjacent relation with the i extraction hole based on an effective input parameter set by adopting a neighborhood screening and arithmetic average calculation method, obtaining the average value of the porous linkage coupling coefficient of the whole porous linkage coupling level of the current extraction hole by carrying out numerical value calculation and averaging, and carrying out combined treatment on the negative pressure stability, the flow attenuation characteristic and the gas release response characteristic of the i extraction hole in a preset time window by adopting an extraction response characteristic comprehensive analysis method based on the negative pressure original value, the extraction gas flow original value, the extraction gas concentration original value and the extraction response time delay value of the i extraction hole, and quantitatively representing the extraction response difference degree of the coal body region corresponding to the current extraction hole to obtain a space partition index.
10. The system for dynamically evaluating the effective radius of coal-bed gas extraction based on porous linkage coupling according to claim 9, wherein the third calculation unit is used for calculating and obtaining a dynamic effective radius correction coefficient after dimensionless processing by combining the obtained porous linkage coupling coefficient mean value and the spatial partition index of the ith extraction hole and the change rate of the gas concentration of the ith extraction hole along with time; The third analysis unit is configured to perform a comparison analysis on the dynamic effective radius correction coefficient and the dynamic effective radius correction threshold by presetting the dynamic effective radius correction threshold, and obtain a third evaluation result, where the obtaining includes: When the dynamic effective radius correction coefficient is less than or equal to the dynamic effective radius correction threshold value, the current extraction hole effective radius evaluation result is qualified, and continuous monitoring is performed; when the dynamic effective radius correction coefficient > dynamic effective radius correction threshold value, the current extraction hole effective radius evaluation result is not qualified, the extraction effective radius in the coal seam area corresponding to the current extraction hole does not reach the design requirement, the action range is limited or the dynamic attenuation risk exists, a third early warning instruction is triggered, a third strategy is generated, extraction negative pressure graded adjustment is conducted, the negative pressure set value of the current extraction hole is adjusted downwards or upwards by 5% -15% to improve local pressure gradient distribution, inter-hole collaborative extraction proportion adjustment is conducted, collaborative extraction participation proportion of adjacent holes associated with the current extraction hole is improved by 10% -20%, extraction time sequence dynamic correction is conducted, continuous extraction duration is prolonged or shortened by 10% -30%, gas continuous release capacity is enhanced, and after the adjustment strategy is executed, the dynamic effective radius correction coefficient is collected again, and closed loop evaluation is formed.

Description

Coal seam gas extraction effective radius dynamic evaluation system based on porous linkage coupling Technical Field The invention relates to the technical field of coal mine safety engineering and physical analysis, in particular to a coal seam gas extraction effective radius dynamic evaluation system based on porous linkage coupling. Background The coal seam gas extraction is one of key technical means in coal mine safety production, and the key aim is to realize effective release and migration of gas in a coal seam by drilling extraction holes and applying negative pressure, so that the gas content and gas pressure are reduced, and gas accidents are prevented. In practical engineering application, the extraction effective radius is used as an important index for measuring the action range of a single extraction hole or an extraction system, and is directly related to the arrangement density of the extraction holes, the setting of extraction parameters and the regional gas control effect. The existing determination mode of the effective radius of coal seam gas extraction mainly depends on engineering experience, an empirical formula or a local monitoring result to estimate, and negative pressure attenuation or gas flow change conditions under a single-hole visual angle are generally adopted for judgment. The method is difficult to quantitatively describe dynamic changes in the extraction process, and the coal seam heterogeneous conditions, gas occurrence differences and the disturbance response of the extraction process are not effectively described, so that the extraction effective radius assessment result has larger uncertainty. On the other hand, in actual extraction engineering, the extraction holes are often arranged in a form of a porous group, different extraction holes are mutually communicated through a coal body fracture network and a pore structure, and extraction effects are not mutually independent, but obvious linkage coupling effects exist. However, in the prior art, single-hole parameter analysis is mainly used, a systematic quantification method for the coupling relation among holes under the multi-hole linkage extraction condition is lacked, and the influence of multi-hole synergism on the extraction effective radius is difficult to reflect. In addition, with the development of underground sensor technology and monitoring systems, operation data such as negative pressure of a drainage orifice, gas flow, gas concentration and the like can be continuously collected, but the utilization rate of the multi-source monitoring data in the prior art is generally low, and the multi-source monitoring data is often only used for single index monitoring or post analysis, and lacks of technical means for uniformly processing and jointly analyzing the multi-source data and serving for dynamic assessment of the drainage effective radius. Meanwhile, coal beds generally have remarkable heterogeneous characteristics in space, and different areas have large differences in permeability, crack development degree and gas release response. The existing effective radius evaluation method is difficult to combine the spatial difference with the real-time response characteristic in the extraction process, so that the evaluation result is difficult to accurately reflect the actual extraction effect. Furthermore, in the prior art, the evaluation result of the extraction effective radius stays at the analysis level, and effective linkage with decision processes such as extraction parameter adjustment, inter-hole cooperative optimization and the like is lacking, so that a closed-loop control mechanism of 'monitoring-evaluation-adjustment' is difficult to form, and the dynamic optimization operation of an extraction system is not facilitated. Disclosure of Invention The invention aims to provide a coal seam gas extraction effective radius dynamic evaluation system based on porous linkage coupling so as to solve the problems in the background technology. In order to achieve the above purpose, the present invention provides the following technical solutions: Coal seam gas extraction effective radius dynamic evaluation system based on porous linkage coupling includes: the data acquisition module is configured to synchronously acquire multisource physical parameters related to the extraction action range in the coal seam gas porous extraction process, and acquire extraction orifice negative pressure original data, extraction gas flow original data, extraction gas concentration original data, extraction response time delay data and space coordinate information of the coal seam original gas pressure data and extraction holes; The data processing module is configured to perform unified time stamp alignment, outlier identification and elimination processing on the acquired data and establish a standard data set; the extraction action impedance evaluation module is configured to acquire an average negative pressure value of an e