CN114837657A - Coal mine underground gas extraction borehole failure evaluation system - Google Patents
Coal mine underground gas extraction borehole failure evaluation system Download PDFInfo
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- 238000000605 extraction Methods 0.000 title claims abstract description 182
- 239000003245 coal Substances 0.000 title claims abstract description 126
- 238000011156 evaluation Methods 0.000 title claims abstract description 68
- 238000005553 drilling Methods 0.000 claims abstract description 86
- 230000000694 effects Effects 0.000 claims abstract description 37
- 238000010276 construction Methods 0.000 claims abstract description 16
- 239000011435 rock Substances 0.000 claims description 35
- 238000007789 sealing Methods 0.000 claims description 21
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 18
- 238000009826 distribution Methods 0.000 claims description 12
- 230000035699 permeability Effects 0.000 claims description 12
- 238000005259 measurement Methods 0.000 claims description 11
- 238000012544 monitoring process Methods 0.000 claims description 11
- 238000005065 mining Methods 0.000 claims description 10
- 238000000034 method Methods 0.000 claims description 8
- 238000005086 pumping Methods 0.000 claims description 8
- 238000009825 accumulation Methods 0.000 claims description 6
- 238000013500 data storage Methods 0.000 claims description 6
- 230000007613 environmental effect Effects 0.000 claims description 6
- 230000009467 reduction Effects 0.000 claims description 4
- 239000007921 spray Substances 0.000 claims description 4
- 239000003818 cinder Substances 0.000 claims description 3
- 230000036571 hydration Effects 0.000 claims description 3
- 238000006703 hydration reaction Methods 0.000 claims description 3
- 230000008569 process Effects 0.000 claims description 3
- 239000002893 slag Substances 0.000 claims description 3
- 238000011077 uniformity evaluation Methods 0.000 claims description 3
- 238000013461 design Methods 0.000 abstract description 4
- 230000000087 stabilizing effect Effects 0.000 description 4
- 230000008859 change Effects 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 238000007726 management method Methods 0.000 description 3
- 230000002265 prevention Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 239000004047 hole gas Substances 0.000 description 2
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- 208000010392 Bone Fractures Diseases 0.000 description 1
- 206010017076 Fracture Diseases 0.000 description 1
- 206010063385 Intellectualisation Diseases 0.000 description 1
- 208000013201 Stress fracture Diseases 0.000 description 1
- 238000009412 basement excavation Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000011835 investigation Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
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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
- E21B47/00—Survey of boreholes or wells
- E21B47/10—Locating fluid leaks, intrusions or movements
- E21B47/117—Detecting leaks, e.g. from tubing, by pressure testing
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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
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- E21B47/10—Locating fluid leaks, intrusions or movements
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Abstract
The invention discloses a coal mine underground gas extraction borehole failure evaluation system, which comprises: the parameter acquisition module is used for acquiring geological parameters of a coal seam to be researched; the model construction module is used for constructing a gas extraction borehole prediction model; the model prediction module is used for inputting geological parameter data into a gas extraction borehole prediction model and performing prediction judgment on the borehole running state according to judgment indexes; the failure evaluation module is used for dividing the failure types of the drill holes according to the evaluation result to obtain the failure type result of each drill hole; and the failure repairing module is used for repairing the drilled holes according to the failure types of the drilled holes so as to ensure the real-time operation of gas drilling extraction. The coal seam gas extraction device is reasonable in design, can guarantee that coal seam gas extraction reaches the standard on the premise of improving the gas extraction effect and reducing the construction cost, realizes accurate coal seam gas extraction, and provides theoretical basis and technical guidance for on-site extraction drill hole arrangement.
Description
Technical Field
The invention belongs to the field of coal bed gas extraction, and particularly relates to a coal mine underground gas extraction borehole failure evaluation system.
Background
The gas content in most mining areas in China is high, the gas disaster prevention and control pressure is high, and the safety production of mines is restricted. The technology for extracting coal bed gas by drilling is a fundamental measure for reducing the gas content, preventing gas accidents and realizing safe coal mining. The application effect of the technology for extracting coal bed gas by drilling in the aspect of mine gas treatment is obvious. Aiming at the regional characteristics of occurrence of coal bed gas, the key is to accurately determine the drilling hole arrangement parameters and realize standard coal bed gas extraction, which has important significance for preventing and treating mine gas disasters.
When coal seam gas is extracted by adopting the drill hole, the extraction drill hole is influenced by various parameters of the coal seam, the extraction drill hole is easy to lose efficacy to cause the deformation or collapse of the drill hole, and the extraction effect of the coal seam gas is directly influenced by whether the drill hole can be used, so that whether the extraction area can reach the extraction standard within set time is concerned, and the construction amount of the drill hole is influenced. Therefore, at present, an evaluation system for the effectiveness of the coal mine underground gas extraction drill hole is lacked to evaluate the extraction drill hole, so that the problems that the drilling construction amount is too large, the construction cost is increased, the extraction is not up to the standard and the like are easily caused, and the accurate extraction of the coal seam gas cannot be realized.
Disclosure of Invention
In order to achieve the purpose, the invention provides the following scheme: a coal mine underground gas extraction borehole failure evaluation system comprises:
the parameter acquisition module is used for acquiring geological parameters of a coal seam to be researched;
the model construction module is used for constructing a gas extraction borehole prediction model;
the model prediction module is respectively connected with the parameter acquisition module and the model construction module and is used for inputting geological parameter data into the gas extraction borehole prediction model and carrying out prediction judgment on the running state of a borehole according to judgment indexes to obtain a judgment result;
the failure evaluation module is connected with the model prediction module and used for dividing the failure types of the drill holes according to the evaluation result to obtain the failure type result of each drill hole;
and the failure repairing module is connected with the failure judging module and used for repairing the drilled holes according to the failure types of the drilled holes and ensuring the real-time operation of gas drilling extraction.
Preferably, the parameter acquisition module comprises a data acquisition unit and a data storage unit;
the data acquisition unit is used for acquiring coal bed gas parameters, coal rock layer environmental conditions and extraction drilling parameters of a coal bed to be researched;
the data storage unit is connected with the data acquisition unit and used for storing the parameter data acquired by the data acquisition unit.
Preferably, the coal bed gas parameters at least comprise coal bed gas content, coal bed gas pressure,
The environmental conditions of the coal rock stratum at least comprise extraction negative pressure, roadway surrounding rock stress distribution, vertical ground stress of the coal bed, extraction stress distribution, firmness of soft coal rock, water content of the coal rock stratum, permeability of the coal bed, density of the coal bed, porosity of the coal bed and coal cinder accumulation;
the extraction drilling parameters at least comprise drilling gas extraction concentration, gas extraction mixed flow, drilling diameter, drilling depth, drilling distance, hole opening position, drilling direction and drilling inclination angle.
Preferably, the evaluation indexes comprise a drilling effective control range index, a drilling hole distribution uniformity evaluation index, a gas extraction effect evaluation index and a gas extraction effect standard-reaching evaluation index.
Preferably, the failure evaluation module includes:
the failure evaluation position input unit is used for inputting position information of a mine and an area which need failure evaluation, or selecting the position information of the mine and the area which have been subjected to failure evaluation;
and the failure judgment result output unit is used for obtaining the judgment result, classifying the judgment result into a failure judgment result and a standard judgment result, and then storing and outputting the results.
Preferably, the failure evaluation module further comprises a basic condition failure evaluation unit for judging a failure result through an evaluation index, a drilling arrangement failure evaluation unit, a pre-pumping effect index failure evaluation unit, an actual measurement effect index failure evaluation unit and a monitoring index failure evaluation unit;
the judgment indexes of the basic condition failure judgment unit comprise whether a gas extraction system is established and operates continuously normally, and whether a gas extraction plan and an annual plan are formulated;
the judgment indexes of the borehole arrangement failure judgment unit comprise whether the effective control range definition of the extraction borehole meets the effective control range requirement or not, the borehole uniformity degree and whether the pre-extraction time difference coefficient meets less than 40% or not;
the judgment indexes of the pre-pumping effect index failure judgment unit comprise residual gas content, residual gas pressure and analyzable gas content;
the judgment indexes of the actual measurement effect index failure judgment unit comprise residual gas content, residual gas pressure, analyzable gas content and the existence of dynamic phenomena such as spray holes, top drilling and the like in the actual measurement process;
the judgment indexes of the monitoring index failure judgment unit comprise the working face gas extraction rate, the mining working face wind speed, the gas concentration in the return airway and the mine gas extraction rate.
Preferably, the failure types of the drill holes at least comprise coal seam permeability reduction failure, drill hole collapse and plugging failure, drill hole accumulated water plugging failure, drill hole sealing failure, drill hole string failure and drill hole sealing failure.
Preferably, the borehole collapse and hole plugging failure comprises borehole coal slag accumulation and hole plugging failure, borehole wall deformation collapse and hole plugging failure, and soft rock hydration expansion and hole plugging failure;
the borehole accumulated water blockage failure comprises downward borehole accumulated water blockage failure and local low-lying accumulated water blockage failure of near-horizontal drilling, directional long drilling and branch drilling;
the sealing failure of the drilled hole and the sealed hole comprises the failure of the damaged gas leakage of the extraction pipe, the failure of the sealing of the hole sealing section, and the failure of insufficient hole sealing depth.
The invention discloses the following technical effects:
the coal seam gas extraction device is reasonable in design, can guarantee that coal seam gas extraction reaches the standard on the premise of improving the gas extraction effect and reducing the construction cost, realizes accurate coal seam gas extraction, and provides theoretical basis and technical guidance for on-site extraction drill hole arrangement.
The method provides a basis for developing technical measures such as failure borehole restoration and the like in a targeted manner, effectively improves the utilization efficiency of the extraction borehole and the level of fine management technology, and ensures the smooth connection of the coal mine gas extraction effect and the mine extraction.
According to the invention, the gas extraction borehole failure evaluation system is used for monitoring and evaluating the borehole in real time, so that whether the borehole can fail or not can be accurately known, the consumed manpower and material resources are less, and the system has important significance for realizing visualization, dynamism and intellectualization of mine gas.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a system according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In order to make the aforementioned objects, features and advantages of the present invention more comprehensible, the present invention is described in detail with reference to the accompanying drawings and the detailed description thereof.
As shown in fig. 1, the invention provides a failure evaluation system for a gas extraction borehole in a coal mine, which comprises:
the parameter acquisition module is used for acquiring geological parameters of a coal seam to be researched;
further optimizing the scheme, the parameter acquisition module comprises a data acquisition unit and a data storage unit;
the data acquisition unit is used for acquiring coal seam gas parameters, coal rock layer environmental conditions and extraction drilling parameters of a coal seam to be researched;
the coal bed gas parameters at least comprise coal bed gas content, coal bed gas pressure,
The environmental conditions of the coal rock stratum at least comprise extraction negative pressure, roadway surrounding rock stress distribution, vertical ground stress of the coal bed, extraction stress distribution, firmness of soft coal rock, water content of the coal rock stratum, permeability of the coal bed, density of the coal bed, porosity of the coal bed and coal cinder accumulation;
the extraction drilling parameters at least comprise the extraction concentration of the gas in the drill hole, the mixed flow of the gas extraction, the diameter of the drill hole, the depth of the drill hole, the distance between the drill holes, the position of the open hole, the azimuth of the drill hole and the inclination angle of the drill hole.
Obtaining the extraction parameters of the pure gas extraction flow of the drill hole by monitoring the extraction effects of the drill hole at different time, such as extraction negative pressure, the gas extraction concentration of the drill hole and the mixed gas extraction flow; and comparing the extracted borehole monitoring data with a later borehole extraction prediction simulation result, setting a certain error allowable range according to field conditions and detection equipment precision, judging whether the comparison results are consistent, if the comparison results are inconsistent, namely, a mutation point exists, continuously monitoring the extraction state, and further judging whether the borehole is invalid.
Further optimizing the scheme, when the extraction effect of the drill hole at different time is monitored, the extraction information of the gas in each extraction field needs to be monitored in real time, and if the total extraction mixed flow, the gas concentration and the extraction negative pressure are adopted, the change of the total extraction mixed flow is judged: specifically, at least one set of pipeline gas signal sensing device, corresponding sets of pipeline pressure regulating valves and gas extraction dynamic control devices and a working face control host are arranged on each coal mining working face needing gas extraction; the working face control host is connected with each gas extraction dynamic control device in a control mode, each gas extraction dynamic control device is connected with a corresponding pipeline pressure regulating valve in a control mode, and the pipeline gas real-time monitoring device is connected with a signal; the pipeline gas real-time monitoring device monitors the extraction information of the gas in each extraction field in real time, the extraction information comprises the total extraction mixed flow, the gas concentration and the extraction negative pressure, and the change of the total extraction mixed flow is judged.
If the gas flow rate is increased, calculating and comparing the total extraction mixed flow rate increasing speed with the gas extraction pure quantity increasing speed, and if the total extraction mixed flow rate increasing speed is greater than the gas extraction pure quantity increasing speed, reducing the extraction negative pressure; if the rising speed of the total flow of the extracted and mixed gas is less than the rising speed of the pure quantity of the extracted gas, the extraction negative pressure is increased; otherwise, starting a voltage stabilizing mode;
if the gas extraction rate is lower than the gas extraction rate, calculating and comparing the gas extraction rate and the gas extraction rate, and if the gas extraction rate is higher than the gas extraction rate, increasing the gas extraction negative pressure; if the descending speed of the total flow of the extraction mixture is less than the descending speed of the pure quantity of the extracted gas, the extraction negative pressure is reduced; otherwise, starting a voltage stabilizing mode; if not, the voltage stabilizing mode is started.
Monitoring the extraction negative pressure in real time, after entering a pressure stabilizing mode, judging whether the extraction negative pressure is in the extraction negative pressure threshold range, and if the extraction negative pressure is greater than the upper limit set value of the negative pressure threshold, reducing the extraction negative pressure to the set range; if the gas is smaller than the lower limit set value of the threshold range, increasing the extraction negative pressure to a set range; if the current state is maintained within the negative pressure threshold range.
And the data storage unit is connected with the data acquisition unit and used for storing the parameter data acquired by the data acquisition unit.
The model construction module is used for constructing a gas extraction borehole prediction model;
further optimizing the scheme, the gas extraction drilling prediction model is established based on coal seam gas parameters, coal rock stratum conditions, extraction drilling parameters and a coal seam gas flow theory, and a time-space model for coal mine underground drilling extraction prediction is constructed, and the method comprises the following steps:
the method comprises the following steps of (1) determining coal seam gas parameters, namely basic parameters of regional coal seam gas, specifically including coal seam gas content, coal seam gas pressure, coal seam permeability, coal seam density and coal seam porosity;
the coal rock stratum conditions, namely the coal rock stratum environment where the extraction drill hole is located, specifically comprise roadway surrounding rock stress distribution, mining stress distribution, firmness of soft coal rock and water content of the coal rock stratum;
extracting drilling parameters including parameters of the diameter of a drill hole, the depth of the drill hole and the distance between the drill holes, performing construction design before gas extraction is performed on the mining working face, designing an extraction drill hole arrangement diagram and a drill hole parameter table, and recording drilling construction hole forming parameters in detail; wherein, the contents of the drilling parameter table comprise drilling diameter, spacing, opening position, drilling azimuth, inclination angle and depth;
the coal bed gas flow theory, including the coal bed gas seepage theory, the mass conservation law and the gas extraction theory, is the theoretical basis for constructing a drilling gas extraction model.
By dynamically correcting the drilling gas extraction prediction model, a change curve of the extraction effect along with time is obtained, so that the drilling gas extraction standard reaching index and time are obtained through judgment.
Establishing a coal-rock mass model by using COMSOLULTIPhysics numerical simulation software through a computer, and inputting geological parameters of a coal seam region to be researched; the coal-rock mass model is a cube, the width direction of the coal-rock mass model is along the coal seam extraction direction, and the length direction of the coal-rock mass model is along the linear direction from the air inlet tunnel to the air return tunnel;
setting the top of a coal-rock mass model to apply uniform load by using COMSOLULTIPhysics numerical simulation software through a computer, setting the bottom of the coal-rock mass model as a fixed boundary, setting the periphery of the coal-rock mass model as a sliding boundary, and setting the exposed surface of the roadway coal wall in the coal-rock mass model as a free boundary; and the load uniformly applied to the top of the coal-rock mass model is equal to the vertical ground stress F of the coal bed to be researched.
The model prediction module is respectively connected with the parameter acquisition module and the model construction module and is used for inputting geological parameter data into the gas extraction borehole prediction model, and performing prediction judgment on the borehole running state according to the judgment indexes to obtain a judgment result;
the evaluation indexes comprise a drilling effective control range index, a drilling hole distribution uniformity evaluation index, a gas extraction effect evaluation index and a gas extraction effect standard-reaching evaluation index.
Further optimizing the scheme, the method for measuring the effective control range of the drill hole specifically comprises the following steps: for bedding drilling, the effective drilling range is determined according to a control edge line in the length direction of the drilling, a connection line of two drilling holes at the edge and the drilling hole opening position; for cross-layer drilling, the effective range of the drilling hole is defined by a connecting line between coal points of adjacent effective edge holes; the control edge line in the length direction of the drill hole is a connecting line of effective hole depth points of the drill hole, and the final hole point of the short hole in the adjacent effective drill hole is used as the effective hole depth point of the adjacent drill hole;
and (3) evaluating the uniformity degree of drilling and hole distribution: after the gas drilling construction of the pre-pumping coal seam is finished, the uniformity degree of the gas drilling in an effective control range is evaluated, the pre-pumping drilling hole interval is smaller than or equal to the design interval, the drilling hole intervals are the same, and the areas with consistent pre-pumping time are divided into an evaluation unit, so that the classification evaluation is facilitated;
the method for measuring the gas extraction effect evaluation index specifically comprises the following steps: when the pre-gas-extraction effect of the same evaluation unit is evaluated, firstly, the pre-gas-extraction effect index is actually measured on site after the residual gas content or the residual gas pressure and the desorbable gas amount after extraction according to the extraction measurement parameters meet the expected standard index requirement;
the standard judgment indexes of the gas extraction effect are specifically as follows: when the gas emission quantity comes from the coal face of the mining layer, judging whether the gas extraction effect of the coal face evaluation range reaches the standard or not according to the daily output of the coal face and the desorbable gas quantity within the evaluation range; for the outburst coal seam, judging that the pre-extraction gas outburst prevention effect of the outburst coal seam evaluation range reaches the standard when the residual gas pressure or the residual gas content of the coal seam measured by all measuring points in the evaluation range is smaller than the expected outburst prevention effect standard gas pressure or gas content and no spray holes, top drills or other power phenomena exist during drilling construction and measurement, and otherwise, judging that the range with the over-standard point as the center of a circle and the radius of 100m does not reach the standard; judging whether the gas emission quantity of the coal face is from the adjacent layer or the surrounding rock, and judging whether the gas pre-extraction effect of the coal face reaches the standard according to the absolute gas emission quantity of the coal face and the gas extraction rate of the coal face; and for mine gas extraction, judging that the mine gas pre-extraction effect reaches the standard according to the absolute gas emission quantity of the mine and the mine gas extraction rate.
The failure evaluation module is connected with the model prediction module and used for dividing the failure types of the drill holes according to the evaluation result to obtain the failure type result of each drill hole;
further optimizing the scheme, the failure evaluation module comprises:
the failure evaluation position input unit is used for inputting position information of a mine and an area which need failure evaluation, or selecting the position information of the mine and the area which have been subjected to failure evaluation;
and the failure judgment result output unit is used for obtaining the judgment result, classifying the judgment result into a failure judgment result and a standard judgment result, and then storing and outputting the results.
Further optimizing the scheme, the failure evaluation module further comprises a basic condition failure evaluation unit for judging a failure result through evaluation indexes, a drilling arrangement failure evaluation unit, a pre-pumping effect index failure evaluation unit, an actual measurement effect index failure evaluation unit and a monitoring index failure evaluation unit;
the judgment indexes of the basic condition failure judgment unit comprise whether a gas extraction system is established and operates continuously normally, and whether a gas extraction plan and an annual plan are formulated;
the judgment indexes of the borehole arrangement failure judgment unit comprise whether the effective control range definition of the extraction borehole meets the requirement of the effective control range or not, the borehole uniformity degree and whether the pre-extraction time difference coefficient meets less than 40% or not;
the judgment indexes of the pre-pumping effect index failure judgment unit comprise residual gas content, residual gas pressure and analyzable gas content;
the judgment indexes of the actual measurement effect index failure judgment unit comprise residual gas content, residual gas pressure, analyzable gas content and the existence of dynamic phenomena such as spray holes, top drilling and the like in the actual measurement process;
the judgment indexes of the monitoring index failure judgment unit comprise the gas extraction rate of the working face, the wind speed of the mining working face, the gas concentration in the return airway and the gas extraction rate of the mine.
And the failure repairing module is connected with the failure judging module and used for repairing the drilled holes according to the failure types of the drilled holes and ensuring the real-time operation of gas drilling extraction.
The failure types of the drill holes at least comprise coal seam permeability reduction failure, drill hole collapse and plugging failure, drill hole accumulated water plugging failure, drill hole sealing failure, drill hole string hole failure and drill hole sealing failure.
The failure of the collapse and plugging of the drilling hole comprises the failure of the collapse and plugging of the drilling hole due to the accumulation of coal slag, the failure of the collapse and plugging of the deformation and the collapse of the hole wall of the drilling hole and the failure of the hydration and expansion of soft rock;
the borehole accumulated water blockage failure comprises downward borehole accumulated water blockage failure and partial low-lying accumulated water blockage failure of near-horizontal drilling, directional long drilling and branch drilling;
the sealing failure of the drilled hole and the sealed hole comprises the failure of the damaged gas leakage of the extraction pipe, the failure of the sealing of the hole sealing section, and the failure of insufficient hole sealing depth.
After the failure type of the drill hole is determined, corresponding drill hole repairing and coal seam permeability increasing technical measures are carried out, or extraction engineering parameters and an extraction and mining plan are adjusted, and then the next region drill hole extraction operation is guided; the drilling hole repairing aims at the types of drilling hole collapse and plugging failure, drilling hole accumulated water plugging failure and drilling hole sealing failure;
when the permeability of the coal bed is reduced and the coal bed fails, the micro-fracture flow channel of the coal bed is blocked, so that the migration output channel is blocked; the permeability of the coal seam is increased, and permeability increasing operation is carried out on the coal seam aiming at the permeability reduction so as to improve the gas circulation of the coal seam;
when the hole collapse and plugging failure of the drilling hole and the accumulated water plugging failure of the drilling hole cause the circulation of the main hole passage of the drilling hole to be blocked and failed. And determining a gas leakage channel existing in the extraction drill hole, thereby determining the failure type of the extraction drill hole, including the hole string failure of the drill hole, the sealing failure of a hole sealing section of the drill hole, the deep fracture of the coal rock stratum and the geological structure.
The extraction and excavation plan is adjusted to prolong the extraction standard reaching time under the condition that effective drilling hole repair cannot be carried out and anti-reflection operation is not carried out;
and modifying the arrangement parameters of the extraction drill holes on the premise of adjusting extraction engineering parameters aiming at the drill holes which cannot be effectively repaired and not adjusting the extraction plan, reinforcing the coal seam gas extraction by adopting a remedial drilling mode, recovering the drill hole gas extraction after the measures are completed, modifying the prediction model of the drill hole gas extraction, and performing extraction drill hole failure judgment and extraction standard reaching pre-evaluation of the next cycle according to the extraction effect investigation period or at regular intervals.
The positioning system also comprises a system management module which is used for realizing the management of the user, modifying, adding and/or deleting the related parameter attributes in the data acquisition unit and displaying the corresponding data.
The above-described embodiments are merely illustrative of the preferred embodiments of the present invention, and do not limit the scope of the present invention, and various modifications and improvements of the technical solutions of the present invention can be made by those skilled in the art without departing from the spirit of the present invention, and the technical solutions of the present invention are within the scope of the present invention defined by the claims.
Claims (8)
1. The utility model provides a colliery is gas drainage drilling failure evaluation system in pit which characterized in that includes:
the parameter acquisition module is used for acquiring geological parameters of a coal seam to be researched;
the model construction module is used for constructing a gas extraction borehole prediction model;
the model prediction module is respectively connected with the parameter acquisition module and the model construction module and is used for inputting geological parameter data into the gas extraction borehole prediction model and carrying out prediction judgment on the running state of a borehole according to judgment indexes to obtain a judgment result;
the failure evaluation module is connected with the model prediction module and used for dividing the failure types of the drill holes according to the evaluation result to obtain the failure type result of each drill hole;
and the failure repairing module is connected with the failure judging module and used for repairing the drilled holes according to the failure types of the drilled holes and ensuring the real-time operation of gas drilling extraction.
2. The system for evaluating failure of a gas extraction borehole in an underground coal mine according to claim 1,
the parameter acquisition module comprises a data acquisition unit and a data storage unit;
the data acquisition unit is used for acquiring coal bed gas parameters, coal rock layer environmental conditions and extraction drilling parameters of a coal bed to be researched;
the data storage unit is connected with the data acquisition unit and used for storing the parameter data acquired by the data acquisition unit.
3. The system for evaluating failure of a gas extraction borehole in an underground coal mine according to claim 2,
the coal bed gas parameters at least comprise coal bed gas content, coal bed gas pressure,
The environmental conditions of the coal rock stratum at least comprise extraction negative pressure, roadway surrounding rock stress distribution, vertical ground stress of the coal bed, extraction stress distribution, firmness of soft coal rock, water content of the coal rock stratum, permeability of the coal bed, density of the coal bed, porosity of the coal bed and coal cinder accumulation;
the extraction drilling parameters at least comprise drilling gas extraction concentration, gas extraction mixed flow, drilling diameter, drilling depth, drilling distance, hole opening position, drilling direction and drilling inclination angle.
4. The system for evaluating failure of a gas extraction borehole in an underground coal mine according to claim 1,
the evaluation indexes comprise a drilling effective control range index, a drilling hole distribution uniformity evaluation index, a gas extraction effect evaluation index and a gas extraction effect standard-reaching evaluation index.
5. The system for evaluating failure of a gas extraction borehole in an underground coal mine according to claim 1, wherein the failure evaluation module comprises:
the failure evaluation position input unit is used for inputting position information of a mine and an area which need failure evaluation, or selecting the position information of the mine and the area which have been subjected to failure evaluation;
and the failure judgment result output unit is used for obtaining the judgment result, classifying the judgment result into a failure judgment result and a standard judgment result, and then storing and outputting the results.
6. The system for evaluating the failure of the underground gas extraction borehole of the coal mine according to claim 1, wherein the failure evaluation module further comprises a basic condition failure evaluation unit for judging a failure result through an evaluation index, a borehole arrangement failure evaluation unit, a pre-extraction effect index failure evaluation unit, an actual measurement effect index failure evaluation unit and a monitoring index failure evaluation unit;
the judgment indexes of the basic condition failure judgment unit comprise whether a gas extraction system is established and operates continuously normally, and whether a gas extraction plan and an annual plan are formulated;
the judgment indexes of the borehole arrangement failure judgment unit comprise whether the effective control range definition of the extraction borehole meets the effective control range requirement or not, the borehole uniformity degree and whether the pre-extraction time difference coefficient meets less than 40% or not;
the judgment indexes of the pre-pumping effect index failure judgment unit comprise residual gas content, residual gas pressure and analyzable gas content;
the judgment indexes of the actual measurement effect index failure judgment unit comprise residual gas content, residual gas pressure, analyzable gas content and the existence of dynamic phenomena such as spray holes, top drilling and the like in the actual measurement process;
the judgment indexes of the monitoring index failure judgment unit comprise the working face gas extraction rate, the mining working face wind speed, the gas concentration in the return airway and the mine gas extraction rate.
7. The system for evaluating failure of a gas extraction borehole in an underground coal mine according to claim 1,
the failure types of the drill holes at least comprise coal seam permeability reduction failure, drill hole collapse and plugging failure, drill hole accumulated water plugging failure, drill hole sealing failure, drill hole string hole failure and drill hole sealing failure.
8. The system for evaluating failure of a gas extraction borehole in an underground coal mine according to claim 7,
the failure of the collapse and blockage of the drilling hole comprises the failure of the collapse and blockage of the drilling hole due to the accumulation of coal slag, the failure of the collapse and blockage of the deformation and the blockage of the hole wall of the drilling hole and the failure of the hydration and expansion of soft rock;
the borehole accumulated water blockage failure comprises downward borehole accumulated water blockage failure and local low-lying accumulated water blockage failure of near-horizontal drilling, directional long drilling and branch drilling;
the sealing failure of the drilled hole and the sealed hole comprises the failure of the damaged gas leakage of the extraction pipe, the failure of the sealing of the hole sealing section, and the failure of insufficient hole sealing depth.
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