CN113294143A - Method for evaluating ground advanced area exploration treatment effect of coal seam floor limestone water damage - Google Patents
Method for evaluating ground advanced area exploration treatment effect of coal seam floor limestone water damage Download PDFInfo
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Abstract
The invention discloses a method for evaluating the investigation and treatment effect of a coal seam floor limestone water damage ground advanced region, which comprises the following steps: evaluating the drilling track in the construction process of long-distance directional drilling on the ground, and scoring each secondary index according to an evaluation standard; according to whether the drilled stratum has structural development or not, correspondingly selecting an evaluation standard of a normal stratum or an abnormal stratum, evaluating the drilling exploration result, and scoring each secondary index according to the evaluation standard; evaluating the grouting treatment effect, and scoring each secondary index according to an evaluation standard; and according to the scoring results of the 3 items and the evaluation index calculation standard, calculating the sum of the weighted values corresponding to each evaluation item index to obtain a comprehensive treatment effect score, and determining the quality grade of the investigation treatment engineering effect of the bottom plate limestone water damage ground advanced area according to the comprehensive score and the evaluation grade table. The invention has wide application range and can comprehensively reflect the actual treatment engineering effect.
Description
Technical Field
The invention belongs to the field of evaluation of water damage of limestone of a coal seam floor, and particularly relates to an evaluation method of a ground advanced area exploration treatment effect of water damage of limestone of a coal seam floor.
Background
The coal bed bottom plate limestone aquifer has the characteristics of high water pressure, large water quantity, rapid water inrush and the like. In order to safely mine the coal seam above the bottom plate limestone aquifer, advanced treatment measures need to be taken. The effective measure for guaranteeing the safe mining of the coal mine is to use the ground directional drilling technology to treat the limestone water advance area. However, the existing evaluation methods are mostly qualitative descriptive evaluation aiming at a certain specific section of a certain specific mine, lack quantitative evaluation indexes, have large subjective factor influence, poor evaluation result reliability and narrow application range, and cannot comprehensively and truly reflect the actual treatment effect.
Disclosure of Invention
The invention aims to provide an evaluation method for exploring and treating effects of water damage ground advanced areas of a coal bed bottom plate limestone, which is wide in application range, can comprehensively reflect actual treatment engineering effects and can quantitatively represent the exploring and treating effects of the water damage ground advanced areas of the coal bed bottom plate limestone, so as to solve the problem that the exploring and treating effects of the water damage ground advanced areas of the coal bed bottom plate limestone are lack of effective evaluation methods.
In order to achieve the purpose, the invention adopts the following technical scheme:
a method for evaluating the investigation and treatment effect of a coal seam floor limestone water damage ground advanced region comprises the following steps:
(1) evaluating the drilling track in the construction process of long-distance directional drilling on the ground, and scoring each secondary index according to an evaluation standard;
(2) according to whether the drilled stratum has structural development or not, correspondingly selecting an evaluation standard of a normal stratum or an abnormal stratum, evaluating the drilling exploration result, and scoring each secondary index according to the evaluation standard;
(3) evaluating the grouting treatment effect, and scoring each secondary index according to an evaluation standard;
(4) and according to the scoring results of the 3 items and the evaluation index calculation standard, calculating the sum of the weighted values corresponding to each evaluation item index to obtain a comprehensive treatment effect score, and determining the quality grade of the investigation treatment engineering effect of the bottom plate limestone water damage ground advanced area according to the comprehensive score and the evaluation grade table.
The further improvement of the invention is that the evaluation of the drilling track comprises 2 primary evaluation indexes which are the inter-drilling plane spacing and the target layer drilling rate respectively.
The invention has the further improvement that aiming at the evaluation of the drilling track, the main secondary indexes have 6 items, and the actual construction parameters of each index are collected and analyzed in the construction process;
distance between branch holes: the branch hole spacing is determined according to actually measured data of a baseplate grouting diffusion radius test, the purpose is to ensure that the slurry diffusion range can cover the whole treatment area, the branch hole spacing is measured, an MWD wireless inclination measurement while drilling system is adopted to record the spatial three-dimensional coordinates of a drilling track, then the recorded drilling spatial coordinates are projected onto an actual coordinate network of the treatment area, and the spacing of each branch drilling hole is measured in the graph;
secondly, the distance between monitoring points of the track while drilling is as follows: the interval index of the monitoring points of the while-drilling track is used for indicating the control precision of the drilling track, namely three-dimensional coordinate data are taken for the drilling track at certain intervals, the interval of the monitoring points of the while-drilling track adopts an MWD wireless while-drilling inclinometer system to record the three-dimensional coordinates of the recording space of the drilling track, then the recorded spatial coordinates of the drilling are projected to an actual coordinate network of a treatment area, and the interval of the monitoring points is measured in the graph;
horizontal projection and design track deviation in the treatment area: for the deviation between the actual track of the drilling hole and the designed route, an MWD wireless inclination measurement while drilling system is adopted to record the space three-dimensional coordinate of the drilling hole drilling track, then the recorded space coordinate of the drilling hole is projected onto an actual coordinate network of a treatment area, the designed drilling hole track is also projected onto the actual coordinate network, the deviation value is measured along the drilling hole track, the lengths of the drilling hole tracks with the deviation of the drilling hole tracks being greater than the standard value are added, and then the ratio of the deviation of the drilling hole tracks to the length of the projection of the horizontal section of the drilling hole is greater than 75%, namely the deviation is unqualified;
fourthly, deviation between the coordinates of the construction end hole points and the positions of the designed target points: the construction end hole point refers to a three-dimensional coordinate of the end hole position of each branch drilling hole, an MWD wireless inclination measurement while drilling system is adopted to record the three-dimensional coordinate of the position space of the drilling hole end hole, then the three-dimensional coordinate is compared with the end hole position of the designed drilling hole, and the distance between the designed drilling hole end hole position and the designed target point position is calculated by utilizing the three-dimensional coordinate position;
gamma value while drilling: the drilling target horizon and other horizons are different in gamma value while drilling to judge the drilling horizon of the drill hole, the MWD wireless inclination measurement while drilling system can directly read and record the gamma value while drilling, and the gamma value is derived by the system after the drilling construction is finished;
sixthly, the actual drilling rate of the target horizon: and (3) judging the length of the section of the target horizon in the horizontal branch drilling track by combining the rock debris logging data, the gamma value while drilling and the logging information while drilling, and then calculating the ratio of the length of the section of the horizontal branch drilling track to the total length of the branch drilling track, namely the actual drilling encountering rate of the target horizon.
The invention has the further improvement that for the evaluation of the exploration result, whether the target interval is a normal stratum or not is distinguished, and then the corresponding evaluation index is selected according to whether the target interval is a normal stratum or not;
evaluation indexes for normal formation are 4:
drilling time logging change rate: calculating the change rate of the drilling time logging according to the drilling time logging curve; when drilling, recording logging-while-drilling data by using a logging-while-drilling instrument, then deriving a logging-while-drilling curve, determining standard logging-while-drilling data of a target layer according to the logging-while-drilling data when drilling in the target layer, counting the drilling distance deviating from the logging-while-drilling value of the standard logging-while-drilling, and calculating the ratio of the drilling section deviating from the logging-while-drilling value of the standard logging-while-drilling to the total length of a branch hole, namely the logging-while-drilling change rate;
drilling fluid consumption: the consumption of the drilling fluid refers to the loss of mud during drilling; the drilling fluid leakage is calculated through the reduction amount of mud in a mud tank, and the ratio of the reduction amount of the mud in a statistical time period to the time is calculated, namely the drilling fluid consumption;
water permeability of a water pressure test: calculating the water pressure of water injected into the target layer according to the elevation of the position of the target layer, selecting a pressurized water test section, measuring the length of the test section, then, feeding the pressurized water into the drilling test section from the ground, recording the amount of water injected into the test section in unit time, and calculating the water permeability of a pressurized water test according to a permeability formula;
fourthly, the single-meter grouting amount of hole-dividing/sectional grouting: counting the cement slurry injection amount of a branch drilling hole or a certain section, and comparing the quantity of the injected cement slurry with the length of the branch drilling hole or the length of the certain injection section to obtain data, namely the single-meter grouting amount of branch/sectional grouting;
evaluation indexes for normal formation are 5:
drilling abnormity: drilling anomalies refer to anomalies that occur during drilling of a borehole; the drilling abnormity comprises drill dropping, drill sticking and hole drilling, the drilling abnormity is judged by site constructors and is recorded in time, the coordinate position of the drilling abnormity section is determined by combining an MWD wireless inclinometer while drilling system, and the index is judged to be unqualified when the drilling abnormity occurs in the drilling process;
drilling fluid consumption: the parameter acquisition method is the same as that of a normal stratum;
average temperature difference of drilling slurry inlet and outlet: monitoring the mud temperature of the branch drill hole by using an electronic thermometer, drawing a temperature change curve by taking the advancing direction of the horizontal projection direction of the branch drill hole as a horizontal axis and the temperature observation data as a vertical axis, and determining that the mud temperature is unqualified when the average temperature difference is more than 3 ℃;
fourthly, observing the water level in the hole: the water level is measured by a method of electrically measuring the depth by a lead wire or by a measuring rope and a buoy, and the water level is unqualified when the water level is suddenly not measured or abnormally rises;
water permeability of water pressure test: the parameter acquisition method is the same as that of a normal stratum.
The invention has the further improvement that aiming at the evaluation of the exploration process, the normal stratum and the abnormal stratum are firstly distinguished, and then the corresponding evaluation index is selected.
The invention has the further improvement that aiming at the evaluation of the grouting treatment effect, the evaluation is divided into 2 first-level indexes of the single-hole grouting ending standard and the grouting verification result evaluation.
The invention has the further improvement that for the evaluation of the grouting treatment result, 4 main secondary indexes are provided, and the actual construction parameters of each index are collected and analyzed in the construction process;
pressure and flow stabilizing time of single-hole grouting: the grouting pressure is observed by a grouting pump pressure gauge, the grouting flow is observed by a flowmeter, the pressure stabilizing time is observed and recorded by a stopwatch or a watch timing tool, the observed grouting pressure, flow and stabilizing time are compared with the standard, the pressure stabilizing and flow stabilizing are qualified after 30min, otherwise, the pressure stabilizing is unqualified, namely the pressure stabilizing is more than 1.5 times of the Aohu water static pressure, and the flow stabilizing is less than 35L/min;
secondly, comparing the consumption of drilling fluid of adjacent branches: the main exploration hole is provided with a plurality of branch drill holes, the drilling fluid in the drilling process of each branch drill hole is counted, the drilling fluid consumption of the branch hole in unit length is calculated, then the drilling fluid consumption is compared with the adjacent drill holes, and the drilling fluid consumption of the adjacent branch drill holes is unqualified if the difference between the drilling fluid consumption of the adjacent branch drill holes is more than 20%;
thirdly, water pressing and permeating rate after grouting: the observation method of the water permeability of the pressurized water is the same as the detection method of the water permeability index of the pressurized water test in exploration and evaluation, the water permeability of the pressurized water after grouting is not more than 0.01lu, and the water permeability is qualified, otherwise, the water permeability is unqualified;
fourthly, comparing and verifying the grouting amount of adjacent branch holes: and one main exploration hole is provided with a plurality of branch drill holes, the cement slurry consumption of each branch drill hole in the grouting treatment process is counted, the cement slurry consumption of the branch hole in unit length is calculated, and then the cement slurry consumption is compared with the adjacent drill holes, and the unqualified drill hole is obtained when the drilling fluid consumption difference of the adjacent branch drill holes is more than 20%.
The invention is further improved in that the evaluation grade division method is as follows:
comparing and judging item by item according to the listed standards to obtain a weight score corresponding to the index when the weight score reaches the qualified standard;
if the evaluation item does not have monitoring conditions or does not obtain the evaluation index of the relevant data due to other reasons, the evaluation item is not brought into the evaluation range, and the corresponding weight score is not added into the total weight score;
thirdly, adding the evaluated index weight scores to obtain a total weight score, and dividing the sum of the qualified item scores by the total weight score to obtain corresponding percentage data W.
In a further development of the invention, the percentage data W is 100% of the sum of the scores of the individual evaluation indices/of the sum of the evaluation weight scores.
Compared with the prior art, the invention has at least the following beneficial technical effects:
(A) aiming at the evaluation of the water damage of the limestone of the bottom plate, the grouting treatment effect is mostly judged according to actual production disclosure data and mine water inflow observation in the past, the evaluation method has obvious hysteresis, and the final treatment effect can be determined only after several months to several years. The method can evaluate the evaluation standard in the treatment process, has obvious timeliness, and is beneficial to shortening the engineering quality evaluation period.
(B) The grouting effect evaluation is carried out on part of floor limestone water damage ground grouting treatment projects in the treatment process, but the qualitative evaluation is more, the quantitative indexes are few, the evaluation is more directed at a single project measure, and the evaluation is scattered and does not form a system. The invention provides an evaluation system for verifying the whole treatment process from drilling construction to grouting, which is mostly quantitative evaluation indexes, and the evaluation result is easy to quantify.
(C) The evaluation results of the ground grouting treatment effect of the limestone water damage of the bottom plate are graded and can be used as the basis for project quality assessment.
Drawings
FIG. 1 is a schematic flow chart of the implementation of the present invention.
FIG. 2 is a schematic diagram of the evaluation index system of the present invention.
Detailed Description
The invention is further described below with reference to the following figures and examples.
As shown in fig. 1, the method for evaluating the investigation and treatment effect of the advanced ground area caused by water damage of the limestone of the coal seam floor provided by the invention comprises the following steps:
(1) aiming at the evaluation items of the drilling track, the evaluation items comprise 2 primary evaluation indexes, namely the inter-drilling plane spacing and the target layer drilling rate. The 2 first-order indicators are subdivided into 6 second-order indicators.
Firstly, in the evaluation of the spacing between the drilling planes, the spacing between the branch drilling holes, the spacing between monitoring points of the track while drilling, the deviation between horizontal projection and the design track in a treatment area, and the deviation distance between the coordinates of a construction end hole point and a design target point are observed and recorded respectively.
Secondly, comparing the distance parameters of the branch drill holes, the distance of the monitoring points along the drilling track, the horizontal projection and design track deviation in the treatment area, the coordinates of the construction final hole point and the position deviation distance of the design target point with the evaluation standards formulated in the attached table 1, and judging whether the branch drill holes are qualified. If the evaluation index is not qualified, the corresponding weight score is obtained, and if the evaluation index is not qualified, the evaluation index is 0.
And thirdly, in the evaluation of the drilling encounter rate of the target layer, recording the gamma value while drilling in the drilling process, and judging whether the actually measured gamma value while drilling is in the qualified standard (different target layers have different qualified standards of gamma values while drilling, and the standard needs to actually measure the range of the gamma value while drilling of the target layer in a specific construction site), wherein 5 points are obtained after the actually measured gamma value while drilling is qualified, and 0 point is obtained after the actually measured gamma value while drilling is not qualified.
And fourthly, counting and calculating the ratio of the distance of the drill hole in the target stratum to the total drilling depth of the drill hole in the horizontal direction in the drilling process, namely the actual drilling rate of the target stratum, wherein the actual drilling rate of the target stratum is not less than 85% and is qualified when the drill hole is drilled in the stratum with the structure development, the actual drilling rate of the target stratum is up to 100% and is qualified when the drill hole is drilled in the stratum without the structure development, namely the drill hole track in the normal stratum is always in the target stratum. And 5 points can be obtained after the product is qualified, and 0 point can be obtained after the product is unqualified.
(2) For the evaluation of the exploration process, a normal stratum and an abnormal stratum need to be distinguished, and then a corresponding evaluation index is selected.
Drilling in a normal stratum, wherein 4 indexes to be evaluated are drilling logging change rate, drilling fluid consumption, water permeability of a pressurized water test and single-meter grouting amount of hole-dividing (segmented) grouting. And counting the 4 indexes in time in the drilling process, comparing the 4 indexes with the standard, obtaining the corresponding weight score when the 4 indexes are qualified, and obtaining the 0 score when the 4 indexes are not qualified.
And secondly, the stratum with the fault, the collapse column and other structural development is an abnormal stratum, and 5 evaluation indexes are provided in the evaluation of the exploration effect of the abnormal stratum. The drilling anomaly, the drilling fluid consumption, the average temperature difference of the drilling slurry inlet and outlet, the water level observation in the hole and the water permeability of a pressurized water test are respectively. Wherein, two evaluation indexes of drilling abnormity and water level observation in a hole are qualitative indexes which need to be judged by field technicians according to the drilling condition. The drilling abnormity mainly shows the phenomena of drill falling, drill sticking and the like, and the abnormity of the water level observation in the hole shows that the water level suddenly rises or suddenly falls, so that the water level data cannot be monitored. And the other 4 indexes are quantitative indexes, and are compared with the evaluation standard formulated in the table 1 to judge whether the indexes are qualified or not. If the evaluation index is not qualified, the corresponding weight score is obtained, and if the evaluation index is not qualified, the evaluation index is 0.
And thirdly, aiming at the evaluation of the exploration effect, only selecting corresponding evaluation indexes of the normal stratum and the abnormal stratum. And if the stratum is a normal stratum, evaluating according to the evaluation index of the normal stratum, not counting the evaluation index of the abnormal stratum into an evaluation system, and not counting the corresponding weight score into the total weight score. And vice versa.
(3) The evaluation of the grouting treatment effect is mainly divided into two primary indexes, namely a single-hole grouting finishing standard and a grouting verification result evaluation. The evaluation index is subdivided into 4 secondary evaluation indexes.
Firstly, aiming at the standard requirements of single-hole grouting ending, when drilling grouting is ended, the drilling grouting is qualified above 30min of stabilized pressure (more than 1.5 times of AoBu static pressure) and stabilized flow (less than 35L/min); otherwise, the product is not qualified. When the product is qualified, 10 points are obtained, and when the product is not qualified, 0 point is obtained.
And grouting verification mainly comprises 3 secondary evaluation indexes. And respectively verifying the consumption of drilling fluid in adjacent branches, the water permeability of pressurized water after grouting and the grouting amount of adjacent branch holes. And comparing the standard with the evaluation standard formulated in the table 1 to judge whether the standard is qualified. If the evaluation index is not qualified, the corresponding weight score is obtained, and if the evaluation index is not qualified, the evaluation index is 0.
(4) Rating rules for evaluation
And comparing and judging item by item according to the listed standards to obtain the weight score corresponding to the index when the index reaches the qualified standard.
And if the evaluation item does not have the monitoring condition or does not obtain the evaluation index of the relevant data due to other reasons, the evaluation item is not included in the evaluation range, and the corresponding weight score is not added into the total weight score.
Thirdly, adding the evaluated index weight scores to obtain a total weight score, and dividing the sum of the qualified item scores by the total weight score to obtain corresponding percentage data W.
W is the sum of each evaluation index term score/the sum of evaluation weight score 100%
(5) And evaluating the grouting treatment effect of the limestone water damage of the ground long-distance directional drilling bottom plate.
And comparing the obtained percentage data W with the evaluation grade standard (table 2) to obtain the total effect of treating the limestone water damage of the ground long-distance directional drilling bottom plate. W is less than 75%, and is unqualified; w is more than or equal to 75% and less than 90%, and the product is qualified; w is preferably not less than 90% and not more than 100%.
Attached table 1 evaluation standard for water damage grouting treatment effect of long-distance directional drilling floor limestone on ground
Attached table 2 treatment effect evaluation grade table
| Percentage of | W<70％ | 70％≤W<85％ | 85％≤W≤100％ |
| Grade of treatment effect | Fail to be qualified | Qualified | Good effect |
Claims (9)
1. A method for evaluating the investigation and treatment effect of a coal seam floor limestone water damage ground advanced region is characterized by comprising the following steps:
(1) evaluating the drilling track in the construction process of long-distance directional drilling on the ground, and scoring each secondary index according to an evaluation standard;
(2) according to whether the drilled stratum has structural development or not, correspondingly selecting an evaluation standard of a normal stratum or an abnormal stratum, evaluating the drilling exploration result, and scoring each secondary index according to the evaluation standard;
(3) evaluating the grouting treatment effect, and scoring each secondary index according to an evaluation standard;
(4) and according to the scoring results of the 3 items and the evaluation index calculation standard, calculating the sum of the weighted values corresponding to each evaluation item index to obtain a comprehensive treatment effect score, and determining the quality grade of the investigation treatment engineering effect of the bottom plate limestone water damage ground advanced area according to the comprehensive score and the evaluation grade table.
2. The method for evaluating the investigation and treatment effect of the advanced ground area caused by water damage of the limestone of the coal seam floor according to claim 1, wherein the evaluation on the drilling track comprises 2 primary evaluation indexes which are the plane spacing between the drill holes and the drilling rate of a target layer respectively.
3. The method for evaluating the investigation and treatment effect of the advanced ground area of the coal seam floor limestone water damage according to claim 1, wherein 6 main secondary indexes are provided for evaluation of a drilling track, and in the construction process, the actual construction parameters of each index are collected and analyzed;
distance between branch holes: the branch hole spacing is determined according to actually measured data of a baseplate grouting diffusion radius test, the purpose is to ensure that the slurry diffusion range can cover the whole treatment area, the branch hole spacing is measured, an MWD wireless inclination measurement while drilling system is adopted to record the spatial three-dimensional coordinates of a drilling track, then the recorded drilling spatial coordinates are projected onto an actual coordinate network of the treatment area, and the spacing of each branch drilling hole is measured in the graph;
secondly, the distance between monitoring points of the track while drilling is as follows: the interval index of the monitoring points of the while-drilling track is used for indicating the control precision of the drilling track, namely three-dimensional coordinate data are taken for the drilling track at certain intervals, the interval of the monitoring points of the while-drilling track adopts an MWD wireless while-drilling inclinometer system to record the three-dimensional coordinates of the recording space of the drilling track, then the recorded spatial coordinates of the drilling are projected to an actual coordinate network of a treatment area, and the interval of the monitoring points is measured in the graph;
horizontal projection and design track deviation in the treatment area: for the deviation between the actual track of the drilling hole and the designed route, an MWD wireless inclination measurement while drilling system is adopted to record the space three-dimensional coordinate of the drilling hole drilling track, then the recorded space coordinate of the drilling hole is projected onto an actual coordinate network of a treatment area, the designed drilling hole track is also projected onto the actual coordinate network, the deviation value is measured along the drilling hole track, the lengths of the drilling hole tracks with the deviation of the drilling hole tracks being greater than the standard value are added, and then the ratio of the deviation of the drilling hole tracks to the length of the projection of the horizontal section of the drilling hole is greater than 75%, namely the deviation is unqualified;
fourthly, deviation between the coordinates of the construction end hole points and the positions of the designed target points: the construction end hole point refers to a three-dimensional coordinate of the end hole position of each branch drilling hole, an MWD wireless inclination measurement while drilling system is adopted to record the three-dimensional coordinate of the position space of the drilling hole end hole, then the three-dimensional coordinate is compared with the end hole position of the designed drilling hole, and the distance between the designed drilling hole end hole position and the designed target point position is calculated by utilizing the three-dimensional coordinate position;
gamma value while drilling: the drilling target horizon and other horizons are different in gamma value while drilling to judge the drilling horizon of the drill hole, the MWD wireless inclination measurement while drilling system can directly read and record the gamma value while drilling, and the gamma value is derived by the system after the drilling construction is finished;
sixthly, the actual drilling rate of the target horizon: and (3) judging the length of the section of the target horizon in the horizontal branch drilling track by combining the rock debris logging data, the gamma value while drilling and the logging information while drilling, and then calculating the ratio of the length of the section of the horizontal branch drilling track to the total length of the branch drilling track, namely the actual drilling encountering rate of the target horizon.
4. The method for evaluating the investigation and treatment effect of the advanced ground area of the coal seam floor limestone water damage according to claim 1, wherein for the evaluation of the investigation result, whether a target layer section is a normal stratum is distinguished, and then a corresponding evaluation index is selected according to whether the target layer section is a normal stratum;
evaluation indexes for normal formation are 4:
drilling time logging change rate: calculating the change rate of the drilling time logging according to the drilling time logging curve; when drilling, recording logging-while-drilling data by using a logging-while-drilling instrument, then deriving a logging-while-drilling curve, determining standard logging-while-drilling data of a target layer according to the logging-while-drilling data when drilling in the target layer, counting the drilling distance deviating from the logging-while-drilling value of the standard logging-while-drilling, and calculating the ratio of the drilling section deviating from the logging-while-drilling value of the standard logging-while-drilling to the total length of a branch hole, namely the logging-while-drilling change rate;
drilling fluid consumption: the consumption of the drilling fluid refers to the loss of mud during drilling; the drilling fluid leakage is calculated through the reduction amount of mud in a mud tank, and the ratio of the reduction amount of the mud in a statistical time period to the time is calculated, namely the drilling fluid consumption;
water permeability of a water pressure test: calculating the water pressure of water injected into the target layer according to the elevation of the position of the target layer, selecting a pressurized water test section, measuring the length of the test section, then, feeding the pressurized water into the drilling test section from the ground, recording the amount of water injected into the test section in unit time, and calculating the water permeability of a pressurized water test according to a permeability formula;
fourthly, the single-meter grouting amount of hole-dividing/sectional grouting: counting the cement slurry injection amount of a branch drilling hole or a certain section, and comparing the quantity of the injected cement slurry with the length of the branch drilling hole or the length of the certain injection section to obtain data, namely the single-meter grouting amount of branch/sectional grouting;
evaluation indexes for normal formation are 5:
drilling abnormity: drilling anomalies refer to anomalies that occur during drilling of a borehole; the drilling abnormity comprises drill dropping, drill sticking and hole drilling, the drilling abnormity is judged by site constructors and is recorded in time, the coordinate position of the drilling abnormity section is determined by combining an MWD wireless inclinometer while drilling system, and the index is judged to be unqualified when the drilling abnormity occurs in the drilling process;
drilling fluid consumption: the parameter acquisition method is the same as that of a normal stratum;
average temperature difference of drilling slurry inlet and outlet: monitoring the mud temperature of the branch drill hole by using an electronic thermometer, drawing a temperature change curve by taking the advancing direction of the horizontal projection direction of the branch drill hole as a horizontal axis and the temperature observation data as a vertical axis, and determining that the mud temperature is unqualified when the average temperature difference is more than 3 ℃;
fourthly, observing the water level in the hole: the water level is measured by a method of electrically measuring the depth by a lead wire or by a measuring rope and a buoy, and the water level is unqualified when the water level is suddenly not measured or abnormally rises;
water permeability of water pressure test: the parameter acquisition method is the same as that of a normal stratum.
5. The method for evaluating the investigation and treatment effect of the advanced ground area of the coal seam floor limestone water damage according to claim 1, wherein for the evaluation of the investigation process, a normal stratum and an abnormal stratum are firstly distinguished, and then a corresponding evaluation index is selected.
6. The method for evaluating the investigation treatment effect of the coal seam floor limestone water damage ground advanced region according to claim 1, wherein the evaluation of the grouting treatment effect is divided into 2 primary indexes of single-hole grouting ending standard and grouting verification result evaluation.
7. The method for evaluating the investigation and treatment effect of the coal seam floor limestone water damage ground advanced region according to claim 1, wherein 4 main secondary indexes are provided for evaluation of the grouting treatment result, and in the construction process, the actual construction parameters of each index are collected and analyzed;
pressure and flow stabilizing time of single-hole grouting: the grouting pressure is observed by a grouting pump pressure gauge, the grouting flow is observed by a flowmeter, the pressure stabilizing time is observed and recorded by a stopwatch or a watch timing tool, the observed grouting pressure, flow and stabilizing time are compared with the standard, the pressure stabilizing and flow stabilizing are qualified after 30min, otherwise, the pressure stabilizing is unqualified, namely the pressure stabilizing is more than 1.5 times of the Aohu water static pressure, and the flow stabilizing is less than 35L/min;
secondly, comparing the consumption of drilling fluid of adjacent branches: the main exploration hole is provided with a plurality of branch drill holes, the drilling fluid in the drilling process of each branch drill hole is counted, the drilling fluid consumption of the branch hole in unit length is calculated, then the drilling fluid consumption is compared with the adjacent drill holes, and the drilling fluid consumption of the adjacent branch drill holes is unqualified if the difference between the drilling fluid consumption of the adjacent branch drill holes is more than 20%;
thirdly, water pressing and permeating rate after grouting: the observation method of the water permeability of the pressurized water is the same as the detection method of the water permeability index of the pressurized water test in exploration and evaluation, the water permeability of the pressurized water after grouting is not more than 0.01lu, and the water permeability is qualified, otherwise, the water permeability is unqualified;
fourthly, comparing and verifying the grouting amount of adjacent branch holes: and one main exploration hole is provided with a plurality of branch drill holes, the cement slurry consumption of each branch drill hole in the grouting treatment process is counted, the cement slurry consumption of the branch hole in unit length is calculated, and then the cement slurry consumption is compared with the adjacent drill holes, and the unqualified drill hole is obtained when the drilling fluid consumption difference of the adjacent branch drill holes is more than 20%.
8. The method for evaluating the treatment effect of the coal seam floor limestone water damage ground advanced region exploration according to claim 1, wherein the evaluation grade division method comprises the following steps:
comparing and judging item by item according to the listed standards to obtain a weight score corresponding to the index when the weight score reaches the qualified standard;
if the evaluation item does not have monitoring conditions or does not obtain the evaluation index of the relevant data due to other reasons, the evaluation item is not brought into the evaluation range, and the corresponding weight score is not added into the total weight score;
thirdly, adding the evaluated index weight scores to obtain a total weight score, and dividing the sum of the qualified item scores by the total weight score to obtain corresponding percentage data W.
9. The method for evaluating the treatment effect of the advanced ground area of the water damage of the limestone of the coal seam floor according to claim 8, wherein the percentage data W is the sum of the scores of all the evaluation index items/the sum of the evaluation weight scores 100%.
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