CN115829398A - High-precision exploration and evaluation method for coal seam floor branch drill hole - Google Patents
High-precision exploration and evaluation method for coal seam floor branch drill hole Download PDFInfo
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Abstract
The invention provides a high-precision exploration and evaluation method for a coal seam floor branch drill hole, which relates to the technical field of coal seam exploration and comprises the following steps: s1: the drilling track evaluation comprises the first-level indexes of drilling plane spacing and target layer drilling encountering rate, and the evaluation content specifically evaluates the branch hole track from two aspects of the plane and the section of the branch hole; s2: the exploration evaluation is carried out, after the evaluation of the drilling track meets the evaluation requirement, the condition in the rock stratum is evaluated, and a collapse column and a vertical hidden (containing) water guide structure are explored; the invention establishes evaluation indexes of the exploration treatment effect of the coal seam floor limestone ground advanced area, comprising three evaluation items of drilling track, exploration evaluation and grouting treatment evaluation and an encryption verification item, which are subdivided into six first-level indexes and twenty-five second-level indexes; in the exploration treatment process, high-precision exploration of stratum structures and accurate treatment of abnormal geologic bodies are realized through comprehensive analysis and comparison of various indexes, and the drilling construction effect is ensured.
Description
Technical Field
The invention relates to the technical field of coal seam exploration, in particular to a high-precision exploration and evaluation method for branch drill holes of a coal seam floor.
Background
According to the relevant regulations of coal mine water control regulations (coal safety supervision research [ 2018 ] 14), coal mine enterprises and coal mines adopt comprehensive control measures such as exploration, prevention, blockage, dredging, drainage, interception, supervision and the like according to different hydrogeological conditions, main responsibility is implemented, the water control work is promoted from process control to source prevention, local control to regional control, underground control to underground combined control, measure prevention to engineering control and water control as main to combined control and protection, comprehensive exploration, source-separated control, quantitative evaluation and standard mining are achieved, when a coal seam threatened by bottom plate limestone confined water is mined, the principle that Ordovician limestone water and Taiyuan limestone water control are repeated and regional advanced exploration control is needed to be adhered to the coal seam, the vertical water guide structure is mainly explored, the ground advanced exploration is carried out firstly on the coal seam threatened by the current mining bottom plate limestone confined water, grouting transformation is carried out, and the coal seam is deeply exploited in the south of rivers, the south, the Anhui, the Shanxi, and the subsequent high-pressure-bearing coal seam safety exploration can be developed, and the subsequent high-bearing water-bearing research measures are developed;
the similar research progress conditions at home and abroad are as follows: relevant evaluation systems and international specifications for exploration and treatment of coal mine water damage ground areas are not inquired at home and abroad, at present, units such as a Chinese coal department group Sean research institute, the Chinese coal geological administration, the energy resource in Ji, the Huaihei mine group and the like with construction capacity develop deep exploration and a large number of engineering practices on coal mine floor water damage area treatment technologies, but exploration and treatment technologies and safety mining evaluation indexes and standards are still lacked, only qualitative regulations on design, approval, quality control, technical management, engineering acceptance and effect evaluation of floor water damage ground area treatment projects are made in Hebei province local standard coal mine water damage control (DB 13/T2528.4-2017) issued by the Hebei province quality technology supervision agency in 2017 months, but definite quantitative quality technology standards and specifications are lacked;
in the past, whether exploration of a target layer of a bottom plate is finished or not is judged by collecting basic surface phenomena such as rock debris logging, logging during drilling, drilling fluid logging, gamma while drilling, tool clamping and falling of the drilling tool and the like in an exploration and treatment project of a ground area, and the treatment effect judgment of the ground area is mainly judged from engineering practice experiences, a set of evaluation indexes and standards are not formed, qualitative and quantitative analysis cannot be achieved, the judgment effect is lack of theoretical technical support and is less rigorous, and comprehensive analysis and judgment are not achieved.
Disclosure of Invention
Aiming at the problems, the invention provides a high-precision exploration and evaluation method for the branch drill holes of the coal bed bottom plate, which realizes the management and control of the engineering process and the exploration and treatment of the hidden structures (faults, collapse columns and the like) of the coal bed bottom plate through various evaluation indexes and standards, practically realizes the comprehensive exploration and treatment of the vertical hidden water guide structures, effectively prevents the occurrence of water inrush accidents of limestone of the bottom plate, and ensures the safe and efficient exploitation of coal groups.
In order to realize the purpose of the invention, the invention is realized by the following technical scheme: a high-precision exploration and evaluation method for coal seam floor branch drill holes comprises the following steps:
s1: the drilling track evaluation comprises the first-level indexes of drilling plane spacing and target layer drilling encountering rate, and the evaluation content specifically evaluates the branch hole track from two aspects of planes and sections of the branch holes;
s2: the investigation evaluation, after the evaluation of the drilling track meets the evaluation requirement, the condition in the rock stratum is evaluated, and a collapse column and a vertical hidden (including) water guide structure are investigated, wherein the investigation evaluation of the normal stratum and the evaluation of the abnormal stratum are included;
s3: grouting treatment evaluation comprises two primary indexes of single-hole grouting ending and grouting verification, and a grouting treatment effect is ensured through multi-index comprehensive analysis;
s4: in the exploration treatment process, when the existing engineering quantity cannot meet the requirement of grouting treatment evaluation, encryption verification is carried out, and the method comprises the following three indexes: and branch verification holes, hole spacing adjustment and water pressing test times are added.
The further improvement lies in that: the S1 comprises:
s11: the method comprises the following steps of (1) evaluating the spacing between drilling planes, wherein the evaluation comprises four secondary indexes, namely the spacing between branch holes, a track-while-drilling monitoring point, a horizontal projection and design track deviation in a treatment area and a branch hole final point;
s12: and evaluating the drilling rate of the target layer, wherein the evaluation comprises three secondary indexes of rock debris logging identification and analysis, gamma while drilling and actual drilling layer position.
The further improvement is that: the S12 includes:
s121: the rock debris logging identification analysis standard is as follows: target layer characteristics, which are determined according to scheme design;
s122: the gamma while drilling standard is set up: analyzing a gamma value reference value in the stable target layer according to the curve form;
s123: setting an actual drilling horizon standard: and comprehensively judging whether the drilling track is drilled in the target layer according to the combination of rock debris logging, gamma while drilling and logging during drilling, so as to meet the design requirement.
The further improvement lies in that: the S2 comprises the following steps:
s21: the exploration and evaluation of normal stratum are carried out by five secondary indexes of rock debris, logging while drilling, drilling fluid consumption, pressurized water test and hole-dividing (sectional) grouting;
s22: the abnormal stratum evaluation comprises eight secondary indexes of comprehensive logging layer judgment, drilling abnormity, drilling fluid consumption, mud temperature, in-hole water level observation, water quality change, water pressing test and hole (section) grouting.
The further improvement lies in that: the S21 includes:
s211: when rock debris and logging while drilling are evaluated, the index standard is that the horizon is normal, and the analysis result is identified according to the rock debris logging;
s212: when the drilling time logging is evaluated, the index standard is the drilling time change rate, and judgment analysis is carried out according to the drilling time logging curve;
s213: when the drilling fluid consumption is evaluated, the index standard is based on the statistical result of the actual drilling mud consumption of the project;
s214: when evaluating the pressurized water test, classifying the index standard according to the rock permeability grade, and calculating the water permeability by using the pressurized water test;
s215: when the hole (sectional) grouting evaluation is carried out, the index standard is the grouting amount per meter, the normal pressure rise of the grouting is realized, and the pressure loss phenomenon of the grouting pump amount is avoided.
The further improvement lies in that: the S22 includes:
s221: when the comprehensive logging is evaluated, the index standard is as follows: lithology mutation, gamma value mutation and drilling fluid performance mutation, wherein the established basis is lithology except normal stratum in rock debris;
s222: when drilling abnormity is evaluated, the index standard is abnormal phenomena of drill falling and drill sticking, and the set basis is that the phenomena of drill falling and drill sticking occur when a drill encounters a collapse column, a large crack and a karst cave structure;
s223: when the drilling fluid consumption is evaluated, the index standard is based on the mud consumption of a normal stratum;
s224: when the mud temperature is evaluated, the index standard is that when the normal inlet and outlet temperature difference is larger than the average value, the water outlet is considered to be abnormal;
s225: when the water level in the hole is observed and evaluated, the index standard is that the water level can not be suddenly detected or abnormally rises;
s226: when the water quality change is evaluated, the index standard is that the water quality is not consistent with a target layer, and the established basis is that the water temperature, the water level and the water quality are changed after an abnormal structure is disclosed;
s227: when the water pressure test is evaluated, the index standard is the water permeability established according to the water pressure test result of the underground working surface and the water pressure test result of the water pressure of the governing drilling hole of the ground area;
s228: when the hole (subsection) grouting evaluation is carried out, the index standard is as follows: after the cement slurry concentration is adjusted, or under the condition of adopting fly ash mortar and double slurry, the grouting amount of single meter is changed; under full pump amount grouting, no pressure is generated in the hole; and under the condition that the grouting pump amount is not changed, grouting suddenly loses pressure.
The further improvement lies in that: the S3 comprises the following steps:
s31: the evaluation of the completion of the single-hole grouting specifically comprises the following steps: the standard of finishing single-hole grouting is achieved, the pump capacity of the standard of finishing grouting is less than XL/min, the final pressure (total pressure) of grouting is not less than Y times of the maximum hydrostatic pressure of the aquifer to be injected, and the stability is more than Tmin;
s32: the grouting verification evaluation comprises four secondary indexes of adjacent branch drilling fluid consumption comparison, post-grouting pressurized water verification, observation hole water level verification and grouting amount comparison verification.
The further improvement lies in that: the S32 includes:
s321: the consumption of drilling fluid of adjacent branches is compared, the index standard is that the consumption is reduced, and the established basis is that the fracture is better plugged when the consumption of subsequent branches is obviously less than that of earlier branches;
s322: after grouting, pressurized water is verified, and the index standard is that the water is judged to be extremely micro water permeable according to the water permeability;
s323: verifying the water level of the observation hole, wherein the index standard is the water level change of the underground and underground hydrological hole, the established basis is that the water level of the observation hole is influenced by grouting, and the grouting effect is analyzed by combining the water level change of the long observation hole at different levels;
s324: and the comparison and verification of the grouting amount are carried out, the index standard is the grouting amount of the adjacent branch or the jumping middle branch, and the index standard is less, and the established basis is that the grouting amount of the subsequent branch is reduced after the adjacent branch is grouted.
The further improvement lies in that: the S4 comprises the following steps:
s41: adding branch verification holes, wherein the index standard is the hole spacing limit between the two holes;
s42: adjusting the hole spacing, wherein the index standard is defined by adjusting the hole spacing;
s43: and the index standard of the number of times of the pressurized water test is the number of times of the pressurized water test according to the distance limit.
The further improvement lies in that: in the S4, the encryption verification meets the following three conditions: when the stratum of a certain drilling hole section is abnormal, the collected geological information cannot find out the stratum characteristics of the area, and the drilling exploration effect cannot be accurately evaluated; adjacent branch holes pass through the crushing zone in a similar area, the consumption of drilling fluid reaches full loss, and the loss is unchanged before and after grouting treatment; the two adjacent holes have poor grouting treatment effect, the grouting amount is large, and the pressure during grouting can not reach the end standard or can reach the end standard after repeated grouting.
The invention has the beneficial effects that:
1. the invention establishes evaluation indexes of the exploration treatment effect of the coal seam floor limestone ground advanced area, comprising three evaluation items of drilling track, exploration evaluation and grouting treatment evaluation and an encryption verification item, which are subdivided into six first-level indexes and twenty-five second-level indexes; in the exploration treatment process, the treatment effect is ensured through comprehensive analysis of various indexes.
2. The method is conveniently applied to the design, optimization and implementation processes of the regional treatment engineering scheme, various evaluation indexes and standards define the contents of engineering process management and control and exploration treatment of the hidden structures (faults, collapse columns and the like) of the coal seam floor, so that the comprehensive exploration, treatment and evaluation of the vertical hidden water guide structures are practically realized, the occurrence of water inrush accidents of the limestone of the floor can be effectively prevented with high precision, and the safe and efficient exploitation of a coal group is ensured.
Drawings
FIG. 1 is a flow chart of the present invention.
FIG. 2 is a diagram of the main exploration treatment abnormal body of the present invention.
Detailed Description
In order to further understand the present invention, the following detailed description will be made with reference to the following examples, which are only used for explaining the present invention and are not to be construed as limiting the scope of the present invention.
Example one
According to fig. 1, the embodiment provides a high-precision exploration and evaluation method for a coal seam floor branch drill hole, which includes the following steps:
s1: the drilling track evaluation comprises the first-level indexes of drilling plane spacing and target layer drilling encountering rate, and the evaluation content specifically evaluates the branch hole track from two aspects of the plane and the section of the branch hole;
s2: exploration evaluation, namely evaluating the condition in the rock stratum after the evaluation of the drilling track meets the evaluation requirement, exploring a collapse column and a vertical hidden water (containing) conducting structure, wherein the exploration evaluation of a normal stratum and the evaluation of an abnormal stratum are included;
s3: grouting treatment evaluation comprises two primary indexes, namely single-hole grouting ending and grouting verification, and the grouting treatment effect is ensured through multi-index comprehensive analysis;
s4: in the exploration treatment process, when the existing engineering quantity can not meet the requirements of grouting treatment evaluation, encryption verification is carried out, and the method comprises the following three indexes: and branch verification holes, hole spacing adjustment and water pressing test times are added.
Example two
During construction of a branch hole of an S1-2 branch hole of a new second-ore-collection 2201 mining area, 910 m-930 rock debris sequentially contains aluminum mudstone, dolomitic Ordovician limestone and Taiyuan limestone; gamma while drilling values increased from 40 to 100; the temperature difference between the inlet and the outlet of the drilling fluid is 1.5 ℃; the drilling fluid has unchanged performance and consumption of 0.17m 3 H; the speed is reduced from 7min/m to 3min/m during drilling; the water permeability of the three times before and after the water pressure test is respectively 0.0275, 0.0272 and 0.0235lu.
Referring to fig. 2, according to the high-precision exploration evaluation method for the coal seam floor branch drilling, the method comprises the following steps: the rock debris logging, the logging during drilling, the drilling track control, the gamma while drilling and the stratum characteristics at the position indicate that the position is a fault development area, and does not belong to the development condition of a collapse column, and the fault drop is about 5m; according to the temperature difference of the inlet and the outlet of the drilling fluid, the performance of the drilling fluid, the consumption of the drilling fluid and the pressurized water test result, the fault does not conduct water. Therefore, mutual verification and evaluation of 'twelve key technologies' in the method for evaluating the high-precision ground area exploration treatment effect of the coal seam floor are very important for the ground advanced area exploration treatment project, and the method can effectively and reliably evaluate the exploration treatment effect of the ground area treatment project.
EXAMPLE III
The embodiment provides a high-precision exploration and evaluation method for a coal seam floor branch drill hole, which comprises the following steps:
1. the drilling track comprises two items of the plane spacing of the first-level index drilling and the drilling encounter rate of a target layer, and the evaluation content specifically evaluates the branch hole track from two aspects of the plane and the section of the branch hole.
(1) The distance between the drilling planes comprises 4 secondary indexes, namely the distance between the branch holes, a monitoring point of a track while drilling, a deviation of horizontal projection and a designed track in a treatment area and a final hole point of the branch hole.
According to actually measured data of a floor slab grouting diffusion radius test of the working face of the new gathering II ore 210108, the floor slab limestone grouting diffusion radius is 35m; according to the statistics of actually measured diffusion radius recorded by the rock debris of the ground region exploration treatment engineering, the index standard of the distance between the branch holes is 40-60m.
Branch hole diffusion radius of new gathering second mine 2201 and 2301 mining area ground area governing engineering
| Relative relationship of branch holes | Calculating the cement diffusion radius (m)/r according to the cement position |
| S1-2 and S1-3 | 41 |
| S1-2 and S1-1 | 61.7 |
| S1-3 and S1-4 | 39.44 |
| S1-4 and S1-5 | 39 |
| S2-2 and S2-1 | 48.1 |
| S2-2 and S2-3 | 50.2 |
| S2-3 and S2-4 | 42.36 |
(2) The target layer drilling rate comprises the following steps: 3 secondary indexes of rock debris logging identification and analysis, gamma while drilling and actual drilling meeting position.
The rock debris logging identification analysis standard is as follows: and (3) target layer characteristics, namely determining the target layer to be Taiyuan C312 gray according to scheme design, and mainly characterized in that: in this region C 3 12 The ash layer is stable, the thickness of the ash layer is more than 10m, and C 3 12 Ash-rich dragonfly fossil is the main mark layer in the mine area, and its roof is C 3 11 Ash and C 3 12 Coal lines are partially visible in thin layers of mudstone between the ashes, and the thickness of the coal lines is about 0-3 m; c 3 12 The bottom plate of the ash is stable-developing bauxite mudstone, the layer thickness is 2.65-2.75 m, the lithology is light ash-grey green aluminum mudstone, the part is rich in pyrite nodule, and the bottom plate is a regional mark layer.
The gamma while drilling standard is established according to the condition that the gamma value reference value in stable limestone is less than 60api according to curve form analysis, but the gamma value is increased if the limestone contains argillaceous substances and is close to a top plate and a bottom plate. (analysis of conventional drilling Material Water 0101 hole C 3 12 Natural gamma value of ash of 50.4-265.7api, GB0003 hole C 3 12 Ash natural gamma 32.5-160api, water 0701 hole C 3 12 Gray natural gamma value of 5.4-42 api);
the actual drilling horizon standard is set according to rock debris logging, gamma while drilling, logging while drilling and the like, so that whether the drilling track drills in a target layer or not is comprehensively judged, and the design requirement is met.
2. The exploration evaluation is to explore and evaluate the condition in the rock stratum after the plane spacing of the drilling track and the drilling encountering rate of the target stratum meet the evaluation requirements, and mainly aims to explore the collapse column and the vertical hidden water guide structure. The exploration evaluation is evaluated from two major aspects, namely exploration evaluation of normal stratum and evaluation of abnormal stratum, and the judgment standard is comprehensive judgment analysis of secondary indexes of the exploration evaluation:
(1) The normal stratum comprises 5 secondary indexes of exploration and evaluation of rock debris, logging while drilling, drilling fluid consumption, water-pressing test and hole-dividing (sectional) grouting.
And the index standard of the rock debris and logging while drilling is that the horizon is normal, and the analysis result is identified according to the rock debris logging.
And the index standard of the drilling time logging is the drilling time change rate, and judgment analysis is carried out according to the drilling time logging curve.
The index standard of the drilling fluid consumption is less than 3m 3 And h, establishing a statistical result according to the actual drilling mud consumption of the project.
Branch hole slurry consumption statistical table for new gathering second mine 2201 and 2301 mining area ground area governing engineering
| Number of branch hole | Mud consumption m 3 /h |
| S1-2 | 0.02-0.2 |
| S1-3 | 0.02-0.21 |
| S1-1 | 0.02-0.22 |
| S1-4 | 0.02-0.2 |
| S1-5 | 0-0.2 |
| S2-2 | 0.1-0.4 |
| S2-1 | 0.05-0.45 (removing the missing hole section) |
| S2-3 | 0.15-0.6 (removing missing hole section) |
| S2-4 | 0.05-0.4 |
The index standard of the pressurized water test is that the water permeability is less than 0.5lu, and the standard is established according to the following steps: according to rock permeability grade classification in 'drilling water pressure test regulation of hydropower and water conservancy project', the water permeability is calculated to be less than 0.1lu in the water pressure test, and the water is extremely slightly permeable. The rock stratum water permeability in the target stratum of the mine is extremely micro water permeability; 7 working faces of two mining areas 2201 and 2101 in the well are subjected to 36 times of underground drilling water-pressurizing tests aiming at a group C3I and a group C3 II, and the water permeability is calculated to be 0-0.06lu; the water pressing test is carried out for 28 times in total for each branch hole in the regional treatment, and the actual water permeability is 0.012-0.095lu.
The standard of the hole-dividing (sectional) grouting index is that the grouting amount per meter is less than 1m 3 And m, normal pressure rise of grouting is realized, and no pressure loss phenomenon exists under the condition of a certain grouting pump amount. The standard establishment is based on: combining the underground drilling hole grouting analysis of 7 working faces of two mining areas of 2201 and 2101 underground, injecting 1: when the cement slurry is 1 concentration, the amount of the cement slurry injected per meter is 0.0033-0.0206 m 3 /m。
Regional remediationConstruction of 5 horizontal branches in mining area of surface borehole 2201, total drilling footage 6316.69m and cement paste 3906.41m 3 (the cement slurry concentration is not more than 1 3 And/m. 2301 constructing 4 horizontal branch holes in the mining area, drilling into a total drilling footage of 4582.68m (not counting the length of the hole section after the S2-3 branch 1628.31 m) according to the statistics of normal grouting conditions, and injecting cement slurry 2067.46m 3 (the cement slurry concentration is not more than 1 3 And/m. Wherein the S2-3 branch is divided into three times of grouting, the first time is normal section grouting, the second time and the final hole grouting are both loss-back grouting, the length of the first grouting hole section is 920-1628.31 m, the length of the grouting section is 708.31m, and the single grouting amount is 155.52m 3 46.81t of cement and 0.22m of grouting amount per meter 3 And/m. The grouting amount of the second and final hole grouting reaches 3908.11m 3 (the cement paste concentration is less than 1.
(2) The abnormal stratum comprises 8 secondary indexes of comprehensive logging layer judgment, drilling abnormity, drilling fluid consumption, mud temperature, in-hole water level observation, water quality change, pressurized water test and hole (section) grouting.
The comprehensive logging stratum judgment index standard is (1) lithology mutation, (2) gamma value mutation, (3) drilling fluid performance mutation, and the established basis is that lithology except normal stratum, such as broken zone debris, appears in rock debris.
The drilling abnormity index standard is the abnormal phenomena of drill falling, drill sticking and the like, and the establishment basis is that the phenomena of drill falling and drill sticking can occur when the drill meets the structures of a collapse column, a large crack, a karst cave and the like.
The index standard of the drilling fluid consumption is more than or equal to 3.0m 3 H, when the mud consumption is less than 3m 3 The maximum mud consumption of the mining area before loss is not generated is 0.6m 3 H, therefore, is set to be greater than 3m 3 And/h is abnormal stratum.
The standard of the mud temperature index is that the temperature difference between a normal inlet and a normal outlet is more than 3 ℃ of the average value. According to the construction temperature data analysis, the temperature difference between the inlet and the outlet of the slurry is about 2-3 ℃ under normal conditions, and when the temperature difference is larger than the average temperature difference value by 3 ℃, the water outlet is considered to be abnormal.
The standard of the observation index of the water level in the hole is that the water level can not be suddenly detected or abnormally rises.
The standard of the water quality change index is that the water quality is not consistent with a target layer, and the established basis is that the water temperature, the water level and the water quality are changed after the abnormal structure is disclosed.
The standard of the water pressure test index is that the water permeability is more than 1lu, and the water pressure test result of the underground working surface and the water pressure test result of the governing drilling of the ground area are established according to the drilling water pressure test regulation of hydropower and water conservancy project.
When the cement slurry concentration is adjusted to be more than 1, or the conditions of pulverized coal ash slurry, double slurry and the like are adopted, the grouting amount per meter is more than 1m 3 (ii)/m; grouting by a full pump, wherein the grouting amount is more than 2 times of the volume in the hole, and no pressure is generated; and when the grouting pump amount is not changed, grouting suddenly loses pressure. The standard is established according to the statistical result of the drilling grouting amount of 2201 and 2301 mining areas and according to abnormal analysis of a grouting Q-T \ P-T curve.
3. The grouting treatment evaluation comprises two primary indexes of single-hole grouting ending and grouting verification. And the grouting treatment evaluation ensures the grouting treatment effect through comprehensive analysis of various indexes.
(1) And after the single-hole grouting is finished, the single-hole grouting finishing standard is required, the pumping capacity is less than 35L/min according to the grouting finishing standard required by coal mine prevention and control Water Fine rules, and the grouting final pressure (total pressure) is not less than 1.5 times of the maximum hydrostatic pressure of the aquifer to be injected and is stabilized for more than 30 min. "
(2) And grouting verification comprises the steps of adjacent branch drilling fluid consumption comparison, pressurized water verification after grouting, observation hole water level verification and grouting quantity comparison verification of 4 secondary indexes.
The consumption of the drilling fluid of adjacent branches is obviously reduced according to the comparison index standard, and the established basis is that the fracture is better plugged when the consumption of the subsequent branches is obviously less than that of the previous branches.
The water permeability is less than 0.01lu as the standard of the pressurized water verification index after grouting, and the water permeability is less than 0.1lu as the minimum water permeability according to the Water permeability test regulations for Water and Power engineering drilling.
The underground water dynamic analysis index standard is the water level change of hydrological holes on the well, the established basis is that the water level of the observation hole can be influenced by grouting, and the grouting effect is analyzed by combining the water level change of the pilot holes at different levels.
The standard of the comparison and verification index of the grouting amount is that the grouting amount of the adjacent branches or the jumping middle branch is obviously less, and the established basis is that the grouting amount of the subsequent branch is reduced after the adjacent branch is grouted.
4. In the exploration treatment process, if the existing engineering quantity cannot meet the requirement of grouting treatment evaluation, encryption verification is carried out, wherein the encryption verification comprises 3 indexes: and branch verification holes, hole spacing adjustment and water pressing test times are added.
The index standard for adding branch verification holes is that the hole spacing between two holes is not more than 30m.
The index standard for adjusting the hole pitch is to adjust the hole pitch to 30-40m.
The index standard of the number of water pressure tests is that the number of water pressure tests is 1 per 100 m.
The encryption verification needs to satisfy the following three conditions at the same time: drilling to discharge water, wherein the water pressure or the water quality is Aohui water; adjacent branch holes pass through the crushing zone in a similar area, the consumption of drilling fluid reaches full loss, and the loss does not change obviously before and after grouting treatment; the grouting treatment effect of two adjacent holes is poor, the grouting amount is large, and the pressure during grouting can not reach the end standard or can reach the end standard after repeated grouting.
To summarize:
the invention relates to a key technology of twelve bedding branch sections through a ground area management project, which comprises the following steps: the method comprises the following steps of drilling a hole track, a bedding rate, rock debris logging, logging while drilling, gamma logging while drilling, drilling fluid performance detection, drilling fluid consumption logging, simple hydrological observation, drilling fluid inlet and outlet temperature observation, hole depth error, water pressure test and high-pressure grouting reinforcement, and establishes evaluation indexes of the exploration and treatment effect of the coal bed bottom plate limestone ground advanced area, wherein the evaluation indexes comprise three evaluation items of drilling track, exploration evaluation and grouting treatment evaluation and an encryption verification item, and are subdivided into six first-level indexes and twenty-five second-level indexes; in the exploration and treatment process, comprehensive analysis is carried out through various indexes, the treatment effect is ensured, the method is convenient to be applied to the design, optimization and implementation processes of regional treatment engineering schemes, data collection work is guided, meanwhile, the contents of engineering process management and control and treatment of coal seam floor hidden structures (faults, collapse columns and the like) are determined through collected geological and hydrogeological basic information, various evaluation indexes and standards, comprehensive exploration, treatment and evaluation of vertical hidden water guide structures are practically achieved, the occurrence of floor limestone water inrush accidents can be effectively prevented with high precision, and safe and efficient exploitation of coal groups is guaranteed.
The foregoing illustrates and describes the principles, general features, and advantages of the present invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only to illustrate the principle of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the present invention, which fall within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (10)
1. A high-precision exploration and evaluation method for coal seam floor branch drill holes is characterized by comprising the following steps:
s1: the drilling track evaluation comprises the first-level indexes of drilling plane spacing and target layer drilling encountering rate, and the evaluation content specifically evaluates the branch hole track from two aspects of the plane and the section of the branch hole;
s2: the investigation evaluation, after the evaluation of the drilling track meets the evaluation requirement, the condition in the rock stratum is evaluated, and the collapse column and the vertical blind water conducting structure are investigated, wherein the investigation evaluation of the normal stratum and the evaluation of the abnormal stratum are included;
s3: grouting treatment evaluation comprises two primary indexes, namely single-hole grouting ending and grouting verification, and the grouting treatment effect is ensured through multi-index comprehensive analysis;
s4: in the exploration treatment process, when the existing engineering quantity cannot meet the requirement of grouting treatment evaluation, encryption verification is carried out, and the method comprises the following three indexes: and branch verification holes, hole spacing adjustment and water pressing test times are added.
2. The high-precision exploration and evaluation method for the coal seam floor branch drill holes according to claim 1, is characterized in that: the S1 comprises:
s11: the method comprises the following steps of (1) evaluating the spacing between drilling planes, wherein the evaluation comprises four secondary indexes, namely the spacing between branch holes, a track-while-drilling monitoring point, a horizontal projection and design track deviation in a treatment area and a branch hole final point;
s12: and evaluating the drilling rate of the target layer, wherein the evaluation comprises three secondary indexes of rock debris logging identification and analysis, gamma while drilling and actual drilling layer position.
3. The high-precision exploration and evaluation method for the coal seam floor branch drill hole is characterized by comprising the following steps of: the S12 includes:
s121: the rock debris logging identification analysis standard is as follows: target layer characteristics, which are determined according to scheme design;
s122: the gamma while drilling standard is set up: analyzing a gamma value reference value in the stable target layer according to a curve form;
s123: setting an actual drilling horizon standard: and comprehensively judging whether the drilling track drills in the target layer according to the combination of rock debris logging, gamma while drilling and logging while drilling, so as to meet the design requirement.
4. The high-precision exploration and evaluation method for the coal seam floor branch drill holes according to claim 1, is characterized in that: the S2 comprises the following steps:
s21: the exploration and evaluation of the normal stratum are carried out by five secondary indexes of rock debris, logging while drilling, drilling fluid consumption, pressurized water test and hole-dividing (segmented) grouting;
s22: the abnormal stratum evaluation comprises eight secondary indexes of comprehensive logging layer judgment, drilling abnormity, drilling fluid consumption, mud temperature, in-hole water level observation, water quality change, water pressing test and hole (section) grouting.
5. The high-precision exploration and evaluation method for the coal seam floor branch drill hole is characterized by comprising the following steps of: the S21 includes:
s211: when rock debris and logging while drilling are evaluated, the index standard is that the horizon is normal, and the analysis result is identified according to the rock debris logging;
s212: when the drilling time logging is evaluated, the index standard is the drilling time change rate, and judgment analysis is carried out according to the drilling time logging curve;
s213: when the drilling fluid consumption is evaluated, the index standard is based on the statistical result of the actual drilling mud consumption of the project;
s214: when evaluating the pressurized water test, classifying the index standard according to the rock permeability grade, and calculating the water permeability by using the pressurized water test;
s215: when the hole (sectional) grouting evaluation is carried out, the index standard is the grouting amount per meter, the normal pressure rise of the grouting is realized, and the pressure loss phenomenon of the grouting pump amount is avoided.
6. The high-precision exploration and evaluation method for the coal seam floor branch drill hole is characterized by comprising the following steps of: the S22 includes:
s221: when the comprehensive logging is evaluated, the index standard is as follows: lithologic mutation, gamma value mutation and drilling fluid performance mutation, wherein the established basis is that lithologic properties except normal stratum appear in rock debris;
s222: when drilling abnormity is evaluated, the index standard is that abnormal phenomena of drill drop and drill sticking occur, and the established basis is that the phenomena of drill drop and drill sticking occur when the drill meets a collapse column, a large crack and a karst cave structure;
s223: when the drilling fluid consumption is evaluated, the index standard is based on the mud consumption of a normal stratum;
s224: when the mud temperature is evaluated, the index standard is that when the normal inlet and outlet temperature difference is larger than the average value, the water outlet is considered to be abnormal;
s225: when the water level in the hole is observed and evaluated, the index standard is that the water level can not be suddenly detected or abnormally rises;
s226: when the water quality change is evaluated, the index standard is that the water quality is not consistent with a target layer, and the established basis is that the water temperature, the water level and the water quality are changed after an abnormal structure is disclosed;
s227: when the water pressure test is evaluated, the index standard is the water permeability established according to the water pressure test result of the underground working surface and the water pressure test result of the water pressure of the governing drilling hole of the ground area;
s228: when the hole (subsection) grouting evaluation is carried out, the index standard is as follows: after the cement slurry concentration is adjusted, or under the condition of adopting coal-ash mortar and double slurry, the grouting amount per meter is changed; under full pumping grouting, no pressure is generated in the hole; and under the condition that the grouting pump amount is not changed, grouting suddenly loses pressure.
7. The high-precision exploration and evaluation method for the coal seam floor branch drill holes according to claim 1, is characterized in that: the S3 comprises the following steps:
s31: the evaluation of the completion of the single-hole grouting specifically comprises the following steps: the standard of finishing single-hole grouting is met, the pump amount of the standard of finishing grouting is less than XL/min, the final pressure of grouting is not less than Y times of the maximum hydrostatic pressure of a water-bearing layer to be grouted, and the stability is more than Tmin;
s32: the grouting verification evaluation comprises four secondary indexes of adjacent branch drilling fluid consumption comparison, post-grouting pressurized water verification, observation hole water level verification and grouting amount comparison verification.
8. The high-precision exploration and evaluation method for the coal seam floor branch drill hole is characterized by comprising the following steps of: the S32 includes:
s321: the consumption of drilling fluid of adjacent branches is compared, the index standard is that the consumption is reduced, and the established basis is that the fracture is better plugged when the consumption of subsequent branches is obviously less than that of earlier branches;
s322: after grouting, pressurized water is verified, and the index standard is that the water is judged to be extremely micro water permeable according to the water permeability;
s323: verifying the water level of the observation hole, wherein the index standard is the water level change of the underground and underground hydrological hole, the established basis is that the water level of the observation hole is influenced by grouting, and the grouting effect is analyzed by combining the water level change of the long observation hole at different levels;
s324: and the comparison and verification of the grouting amount are carried out, the index standard is the grouting amount of the adjacent branch or the jumping middle branch, and the index standard is less, and the established basis is that the grouting amount of the subsequent branch is reduced after the adjacent branch is grouted.
9. The high-precision exploration and evaluation method for the coal seam floor branch drill holes according to claim 1, is characterized in that: the S4 comprises the following steps:
s41: adding branch verification holes, wherein the index standard is the hole spacing limit between the two holes;
s42: adjusting the hole spacing, wherein the index standard is defined by adjusting the hole spacing;
s43: and the index standard of the number of times of the pressurized water test is the number of times of the pressurized water test according to the distance limit.
10. The high-precision exploration and evaluation method for the coal seam floor branch drill hole is characterized in that: in the S4, the encryption verification meets the following three conditions: when the stratum of a certain drilling hole section is abnormal, the collected geological information cannot find out the stratum characteristics of the area, and the drilling exploration effect cannot be accurately evaluated; adjacent branch holes pass through the crushing zone in a similar area, the consumption of drilling fluid reaches full loss, and the loss is unchanged before and after grouting treatment; the two adjacent holes have poor grouting treatment effect, the grouting amount is large, and the pressure during grouting can not reach the end standard or can reach the end standard after repeated grouting.
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