CN111412012B - Coal roadway stripe region space-time danger coordination extraction method - Google Patents
Coal roadway stripe region space-time danger coordination extraction method Download PDFInfo
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Abstract
The invention relates to a coal roadway stripe region space-time danger coordination extraction method, and belongs to the technical field of coal mine gas extraction. The method comprises the following steps: s1: analyzing the difference of different block sections in the coal roadway strip area on the 'time-space-danger'; s2: calculating gas extraction quantities of different block sections in a coal roadway stripe region; s3: inspecting the extraction radius of different block sections of the coal roadway stripe region along with the change of extraction time; s4: calculating the time difference of extraction reaching standards of different block sections on the basis of subtracting the time difference required by construction extraction drilling of different block sections; s5: and adjusting the extraction reach time of different blocks or adopting an anti-reflection technology according to the extraction reach time difference to ensure that the different blocks achieve coordinated extraction. The method overcomes the defect that the extraction effect of the whole coal roadway stripe region is judged in the same extraction time, so that the block section with the standard extraction is tunneled as early as possible without influencing the gas extraction of the next block section, the tunneling speed of the coal roadway is improved, and the coordinated extraction of the coal roadway stripe region is realized.
Description
Technical Field
The invention belongs to the technical field of coal mine gas extraction, and relates to a coal roadway stripe region space-time danger coordination extraction method.
Background
Coal roadway tunneling is an important link in mining balance, and outburst coal seam coal roadway stripe area extraction is important for safe and rapid coal roadway tunneling. The method is characterized in that the gas of the pre-pumping coal roadway strip of the cross-layer drilling hole is an important means for preventing outburst of the coal roadway region, the region with basically same drilling hole intervals and basically consistent pre-pumping time (the pre-pumping time difference coefficient is less than 30%) is divided into an evaluation unit (block segment for short), and the evaluation unit can carry out sectional evaluation along the coal roadway tunneling direction, but the length of each segment is not less than 200 m. In order to relieve the shortage of coal mine mining replacement, the sectional evaluation of the coal roadway stripe region is a very important means, but different blocks of the coal roadway stripe have differences in aspects of time-space-danger (for short, time-space-danger) and the like, and the extraction time of different blocks is reasonably arranged, so that the extraction of the next block reaches the standard before the tunneling of the coal roadway of the previous block is finished, the tunneling progress is not influenced, and the coordinated and efficient extraction of different blocks of the coal roadway stripe region is realized.
Disclosure of Invention
In view of the above, the invention aims to provide a method for extracting and mining coal roadway stripe regions in a time-space danger coordination manner, which adjusts extraction time-scaling time of different blocks or adopts permeability-increasing technologies such as hydraulic reaming/hydraulic slotting and the like by analyzing differences of different blocks in time, space and dangerousness in the coal roadway stripe regions.
In order to achieve the purpose, the invention provides the following technical scheme:
a coal roadway stripe region space-time danger coordination extraction method comprises the following steps:
s1: analyzing the difference of different blocks in the coal roadway strip area in time, space and danger, namely 'time-space-danger';
s2: calculating gas extraction quantities of different block sections in a coal roadway stripe region;
s3: inspecting the extraction radius of different block sections of the coal roadway stripe region along with the change of extraction time;
s4: calculating the time difference of extraction reaching standards of different block sections on the basis of subtracting the time difference required by construction extraction drilling of different block sections;
s5: according to the extraction standard reaching time difference, the extraction standard reaching time of different blocks is adjusted or anti-reflection technologies such as hydraulic reaming/hydraulic slotting and the like are adopted, so that the different blocks achieve coordinated extraction.
Further, the difference analysis, extraction quantity calculation and extraction radius investigation of the coal roadway stripe region in extraction time all refer to two adjacent front and rear block sections of the coal roadway stripe, and the analogy is carried out on three or more block sections.
Further, the differential analysis of the coal roadway stripe regions in time includes: time difference delta t needed by extraction drilling of block I and block II construction1,2kGenerally less than the time difference required by the extraction reaching the standard of the first block section and the second block section△t1,2cI.e. Δ t1,2k＜△t1,2cAnd Δ t1,2k＜0.5t1jWherein, t1jIs the time required by block coal road tunneling.
Further, in the step S1, the spatial difference analysis of the coal roadway stripe regions means that the coal seams of the front and rear blocks adjacent to each other in the coal roadway stripe are different in trend due to different distances between the bottom plate roadway and the coal seam, the pressure relief degree of the coal roadway stripe regions is different, and the extraction time for reaching the extraction standard of different blocks is different.
Furthermore, in step S1, the differential analysis of the risk of the coal roadway stripe region refers to that factors such as the thickness of the coal seam and the gas content change, the gas extraction amount of different blocks is different, and the extraction time for reaching the extraction standard of different blocks is different.
Furthermore, the extraction standard reaching time of the block sections is adjusted by changing the extraction radiuses of different block sections.
Further, in step S5, adjusting the permeability-increasing techniques of the different segments includes hydraulic reaming or hydraulic slotting.
The invention has the beneficial effects that: the method disclosed by the invention judges the extraction effect of different blocks respectively, overcomes the defect of judging the extraction effect of the whole coal roadway stripe region in the same extraction time, enables the blocks up to the extraction standard to be tunneled as early as possible, does not influence the gas extraction of the next block, improves the tunneling speed of the coal roadway, and realizes the coordinated extraction of the coal roadway stripe region.
Additional advantages, objects, and features of the invention will be set forth in part in the description which follows and in part will become apparent to those having ordinary skill in the art upon examination of the following or may be learned from practice of the invention. The objectives and other advantages of the invention may be realized and attained by the means of the instrumentalities and combinations particularly pointed out hereinafter.
Drawings
For the purposes of promoting a better understanding of the objects, aspects and advantages of the invention, reference will now be made to the following detailed description taken in conjunction with the accompanying drawings in which:
fig. 1 is a schematic flow chart of a method for extracting space-time risk coordination in a coal roadway stripe region according to an embodiment of the invention;
fig. 2 is a graph of change of extraction radius along with extraction time when extraction space and risk are different in the coal roadway stripe region space-time risk coordinated extraction method provided by the embodiment of the invention;
fig. 3 is a gas extraction time difference analysis diagram of a coal roadway stripe region space-time risk coordination extraction method provided by the embodiment of the invention;
fig. 4 is a gas extraction space difference analysis diagram of a coal roadway stripe region space-time risk coordination extraction method provided by the embodiment of the invention;
fig. 5 is a gas extraction risk difference analysis diagram of a coal roadway stripe region space-time risk coordination extraction method according to the first embodiment of the invention;
fig. 6 is a graph of the change of extraction radius along with extraction time in common drilling and hydraulic anti-reflection drilling of the coal roadway stripe region space-time risk coordination extraction method provided by the embodiment of the invention.
Detailed Description
The embodiments of the present invention are described below with reference to specific embodiments, and other advantages and effects of the present invention will be easily understood by those skilled in the art from the disclosure of the present specification. The invention is capable of other and different embodiments and of being practiced or of being carried out in various ways, and its several details are capable of modification in various respects, all without departing from the spirit and scope of the present invention. It should be noted that the drawings provided in the following embodiments are only for illustrating the basic idea of the present invention in a schematic way, and the features in the following embodiments and examples may be combined with each other without conflict.
Referring to fig. 1 to 6, fig. 1 is a schematic flow chart of a method for extracting space-time risk coordination in a coal roadway stripe region, which includes the following steps:
step 1: the differences of the coal roadway strip regions in time, space and danger (hereinafter referred to as 'time-space-danger') are analyzed, the difference analysis is single-factor analysis, and other factors are the same when one factor is analyzed.
The coal roadway stripe area is analyzed in time (in this embodiment, two adjacent blocks are taken as an example, three or more blocks are analogized), and the difference of the extraction standard reaching time of the two adjacent blocks is mainly analyzed because the coal roadway of the previous block needs to be tunneled before the next block and the drilling construction time of the two blocks is different.
The risk of the coal roadway stripe region is analyzed, and the difference of the extraction standard-reaching time of different blocks is caused by the fact that the gas extraction amount of different blocks is different when the factors such as the thickness of coal seams of different blocks, the gas content and the like are different.
Different blocks of the coal roadway stripe region are analyzed in space, and the method mainly analyzes that the normal distances from bottom plate roadways at different positions below the coal roadway stripe region to the coal seam are different due to the occurrence change of the coal seam and the influence of geological structures, so that the pressure relief degree and the extraction effect of the coal roadway stripe region are different, and the extraction standard reaching time difference of different blocks is caused.
Step 2: and calculating the gas extraction amount of different block control areas in the coal roadway stripe area according to parameters such as the thickness of the coal seam, the gas content and the like in the different block control areas.
The total amount of the extracted gas can be calculated according to the following formula:
Qdrawer assembly＝L1×L2×h×γ×W×η
Wherein L is1、L2Controlling the length and width m of the region for extraction drilling; h is the thickness of the coal seam in the extraction drilling control area, m; gamma is the density of the coal bed in the extraction drilling control area, t/m3(ii) a W is the gas content of coal seam in extraction drilling control area, m3T; eta is the determined extraction rate.
And step 3: referring to fig. 2, the extraction standard reaching time of the extraction radius of different block sections in the coal roadway stripe region is inspected, and a curve graph of the change of the extraction radius along with the extraction standard reaching time is formed, so that the extraction time can be adjusted for inquiry and use in different block sections.
And (3) surveying the extraction radiuses of different block sections of the coal roadway stripe region at extraction standard reaching time, mainly adopting a gas content reduction algorithm, namely converting the extraction quantity of the extraction drilling control region and the gas extraction quantity of a single extraction drilling at different extraction times to obtain the extraction standard reaching time at different extraction radiuses.
Firstly, the extraction amount of an extraction drilling control area is calculated, then the extraction amount of an extraction drilling in a period of time is statistically analyzed, the relation between extraction time and extraction radius is calculated, a basis is provided for calculating the time difference of time-space-risk extraction in a coal roadway strip area, the interval between layers of a bottom plate roadway and a coal seam and the thickness of the coal seam are taken as an example (the same is referred to for other cases), and the specific embodiment is shown in fig. 2.
And 4, step 4: and calculating the extraction standard time difference of different block sections on the basis of subtracting the time difference required by the construction extraction drilling of different block sections according to the time-space-danger difference of different block sections.
Referring to fig. 3, the extraction time standard reaching difference analysis of different block sections in the coal roadway stripe region in terms of time needs to realize coordinated extraction of the first block section and the second block section, that is, after the first block section coal roadway is tunneled, the second block section coal roadway is extracted to reach the standard, and the extraction standard reaching time difference of the first block section and the second block section has the following relation:
△t1,2＝t1j＝△t1,2k+△t1,2c＝△t1,2k+t2c-t1c
wherein, Δ t1,2Extracting standard reaching time difference of the block section I and the block section II, d; t is t1jThe required time for tunneling a coal roadway of a block segment is d; delta t1,2kD, constructing the time difference required by extraction drilling for the first block section and the second block section; delta t1,2cD, extracting time difference required for reaching standards for the first block section and the second block section; t is t2cD, the time required for the extraction of the block II to reach the standard is d; t is t1cAnd d, extracting the first extraction block to reach the standard.
The block segment obtained from the above formula should precede the block segment by two t1jThe extraction is finished to reach the standard in time. To realize that a block should precede a block by two t1jThe time for completing the extraction reaches the standard, and the time difference delta t needed by the extraction drilling of the first block section and the second block section is subtracted1,2kOn the basis, the extraction standard reaching time is adjusted by changing the extraction radius of the first block section or the hydraulic reaming/hydraulic cutting permeability increasing technology (collectively referred to as hydraulic permeability increasing technology) is adopted for the first block section, so that the first block section is shortenedExtracting the time up to standard, and leading two adjacent block sections to be extracted coordinately, wherein the specific relation is as follows:
△t1,2＝t1j＝△t1,2k+t2c-t1k＝△t1,2k+t2c-t1s
wherein, t1kAdjusting the extraction radius for the first block segment and then extracting for reaching the standard; t is t1sAnd the time required for extraction to reach the standard after the hydraulic permeability-increasing technology is adopted for the first block. Time difference delta t needed by extraction drilling in block one construction and block two construction1,2kIs generally smaller than the time difference delta t required by extraction reaching the standard of the first block segment and the second block segment1,2cI.e. Δ t1,2k＜△t1,2cAnd Δ t1,2k＜0.5t1j。
Referring to fig. 4, the extraction standard-reaching time difference analysis of different blocks of the coal roadway stripe region on the space is performed, the coal seam is moved upwards, the normal distances from the bottom plate roadways to the coal seam at different places are different due to the occurrence change of the coal seam and the influence of geological structures, the pressure relief degree of the coal roadway stripe region is different, if the layer distances of the bottom plate roadways and the coal seam are respectively H1 and H2, and if H1 is greater than H2, the corresponding extraction standard-reaching time is tH1、tH2And realizing coordinated extraction of the first block section and the second block section, namely before the tunneling of the first block section and the coal roadway is finished, the extraction of the second block section reaches the standard, and the extraction time difference of the first block section and the second block section has the following relational expression:
△t1,2＝t1j＝△t1,2k+△t1,2c＝△t1,2k+tH2-tH1
wherein, tH2Extracting standard reaching time of the block II, d; t is tH1And d, extracting standard reaching time of the block I.
The block segment obtained from the above formula should precede the block segment by two t1jAnd finishing extraction in time. To realize that a block should precede a block by two t1jThe extraction is completed within time, and the time difference delta t needed by the extraction drilling is subtracted from the time difference delta t needed by the construction of the first block section and the second block section1,2kOn the basis, the extraction standard reaching time of the first block section can be shortened by adjusting the hole spacing of the second block section or adopting a hydraulic reaming or hydraulic cutting permeability-increasing technology for the first block section, so that two adjacent block sections can perform coordinated extraction, specificallyThe relationship is as follows:
△t1,2＝t1j＝△t1,2k+tH2-tH1k＝△t1,2k+tH2-tH1s
wherein, tH1kThe extraction time required for reaching the standard after the extraction radius is adjusted for the first block segment; t is tH1sAnd the time required for extraction to reach the standard after the hydraulic permeability-increasing technology is adopted for the first block.
Referring to fig. 5, in the extraction time difference analysis of the dangerousness of different block sections in the coal roadway stripe region, due to the fact that the thicknesses and the gas contents of coal beds of different block sections are different, the gas extraction amounts of different block sections are different, if the thicknesses of the coal beds of the different block sections are h1 and h2 respectively, and if h1 is smaller than h2, the corresponding extraction standard reaching time is th1、th2And realizing coordinated extraction of the first block section and the second block section, namely extracting the second block section to reach the standard before the tunneling of the first block section and the coal roadway is finished, wherein the extraction standard reaching time difference of the first block section and the second block section has the following relational expression:
△t1,2＝t1j＝△t1,2k+△t1,2c＝△t1,2k+th2-th1
wherein, th2Extracting standard reaching time of the block II, and d; t is th1And d, extracting standard reaching time of the block I.
The block segment obtained from the above formula should precede the block segment by two t1jThe extraction is finished to reach the standard in time. To achieve that block one precedes block two t1jThe time for completing the extraction reaches the standard, and the time difference delta t needed by the extraction drilling of the first block section and the second block section is subtracted1,2kOn the basis, the extraction standard reaching time of the first block section can be adjusted by changing the extraction radius of the first block section or the hydraulic reaming/hydraulic cutting permeability increasing technology is adopted for the first block section, the extraction time of the first block section is shortened, and coordinated extraction of the two block sections is realized, wherein the specific relation formula is as follows:
△t1,2＝t1j＝△t1,2k+th2-th1k＝△t1,2k+th2-th1s
wherein, th1kD, adjusting the extraction radius of the first block section, and then extracting to reach the standard for required time; t is th1sAnd d, adopting a hydraulic permeability-increasing technology to extract the required time for reaching the standard in the first block section.
And if the gas contents or other factors of different blocks are different, analogizing according to the method.
And 5: according to the extraction standard reaching time difference of different block sections, the extraction standard reaching time is reduced by adopting different extraction standard reaching time or adopting permeability increasing technologies such as hydraulic reaming/hydraulic slotting and the like for different block sections, so that the different block sections can achieve coordinated extraction.
Referring to fig. 6, the extraction standard reaching time adjustment of the extraction drill hole or the use of the hydraulic permeability-increasing technology includes the steps of firstly calculating the relation between the extraction radius and the extraction standard reaching time under three conditions of common extraction drill holes, hydraulic reaming, hydraulic slotting and the like, then calculating the extraction standard reaching time difference of different block sections, finally searching the figure 6 to determine the extraction time needed, and arranging the extraction drill holes according to the extraction radius corresponding to the extraction standard reaching time.
And (3) implementing a hydraulic permeability increasing technology, arranging extraction drill holes according to the determined extraction radius, and implementing a hydraulic reaming/hydraulic slotting technology to enable the permeability increasing effect to reach corresponding indexes and realize the extraction standard reaching time of a preset requirement.
Finally, the above embodiments are only intended to illustrate the technical solutions of the present invention and not to limit the present invention, and although the present invention has been described in detail with reference to the preferred embodiments, it will be understood by those skilled in the art that modifications or equivalent substitutions may be made on the technical solutions of the present invention without departing from the spirit and scope of the technical solutions, and all of them should be covered by the claims of the present invention.
Claims (7)
1. A coal roadway stripe region space-time danger coordination extraction method is characterized by comprising the following steps:
s1: analyzing the difference of different blocks in the coal roadway strip area in time, space and danger, namely 'time-space-danger';
s2: calculating gas extraction quantities of different block sections in a coal roadway stripe region;
s3: inspecting the extraction radius of different block sections of the coal roadway stripe region along with the change of extraction time;
s4: according to the difference of 'time-space-danger' of different block sections, calculating the time difference of extraction standard reaching of different block sections on the basis of subtracting the time difference required by construction extraction drilling of different block sections; the method specifically comprises the following steps:
1) and (3) performing extraction time standard difference analysis on different blocks of the coal roadway stripe region in time:
the coordinated extraction of the first block section and the second block section is realized, namely after the first block section is tunneled, the second block section is extracted to reach the standard, and the extraction time difference of the first block section and the second block section to reach the standard is the following relational expression:
△t1,2＝t1j＝△t1,2k+△t1,2c＝△t1,2k+t2c-t1k＝△t1,2k+t2c-t1s
wherein, Δ t1,2Extracting standard reaching time difference of a block segment I and a block segment II, t1jTime, Δ t, required for block-coal-roadway driving1,2kTime difference delta t needed for extracting and drilling construction of the first block section and the second block section1,2cThe time difference t required by the extraction reaching the standard is the first block segment and the second block segment2cThe time required for the extraction of the second block segment to reach the standard, t1kAdjusting the extraction radius for the first block segment and then extracting until the required time reaches the standard, t1sThe time required for extraction to reach the standard is adopted for the first block section by adopting a hydraulic permeability-increasing technology;
2) and (3) performing extraction standard reaching time difference analysis on different block sections of the coal roadway stripe region in space:
if the interlayer spacing between the two is H1 and H2 respectively, if H1 is greater than H2, the corresponding extraction standard reaching time is tH1、tH2And realizing coordinated extraction of the first block section and the second block section, namely before the tunneling of the first block section and the coal roadway is finished, the extraction of the second block section reaches the standard, and the extraction time difference of the first block section and the second block section has the following relational expression:
△t1,2＝t1j＝△t1,2k+△t1,2c＝△t1,2k+tH2-tH1k＝△t1,2k+tH2-tH1s
wherein, tH2Extraction standard reaching time of block II, tH1kAdjusting extraction half for block segment oneThe drainage after the diameter reaches the standard for time; t is tH1sThe time required for extraction to reach the standard is adopted for the first block section by adopting a hydraulic permeability-increasing technology;
3) analyzing extraction time difference of different block sections in the coal roadway stripe region on dangerousness:
if the thicknesses of the coal seams of the two coal seams are h1 and h2 respectively, assuming that h1 is less than h2, the corresponding extraction standard reaching time is th1、th2And realizing coordinated extraction of the first block section and the second block section, namely extracting the second block section to reach the standard before the tunneling of the first block section and the coal roadway is finished, wherein the extraction standard reaching time difference of the first block section and the second block section has the following relational expression:
△t1,2＝t1j＝△t1,2k+△t1,2c＝△t1,2k+th2-th1k＝△t1,2k+th2-th1s
wherein, th2Extraction standard reaching time of block II, th1kAdjusting the extraction radius for the first block segment and then extracting for reaching the standard; t is th1sThe time required for extraction to reach the standard is adopted for the first block section by adopting a hydraulic permeability-increasing technology;
s5: and adjusting the extraction standard time of different blocks or the adopted anti-reflection technology according to the extraction standard time difference to ensure that the different blocks achieve coordinated extraction.
2. The coal roadway stripe region space-time risk coordination extraction method according to claim 1, characterized in that the difference analysis, extraction quantity calculation and extraction radius investigation of the coal roadway stripe region in extraction time refer to two adjacent front and rear block sections of the coal roadway stripe, and the analogy is carried out on three or more block sections.
3. The coal roadway stripe region space-time risk coordination extraction method according to claim 2, wherein the time difference analysis of the coal roadway stripe regions comprises: time difference delta t needed by extraction drilling of block I and block II construction1,2kIs less than the time difference delta t required by the extraction reaching the standard of the first block section and the second block section1,2cI.e. Δ t1,2k＜△t1,2cAnd Δ t1,2k＜0.5t1jWhich isIn, t1jIs the time required by block coal road tunneling.
4. The method for extracting space-time risk coordination in the coal roadway stripe region according to claim 2, wherein in the step S1, the spatial difference analysis of the coal roadway stripe region refers to that the distances between the bottom plate roadway and the coal seam are different in the strike direction, the pressure relief degree of the coal roadway stripe region is different, and the extraction time for reaching the extraction standard of different blocks is different.
5. The method for extracting space-time risk coordination in the coal roadway stripe region according to claim 2, wherein in the step S1, the difference analysis of the coal roadway stripe region in danger refers to changes of coal seam thickness and gas content, different gas extraction amounts in different blocks are different, and extraction time for reaching extraction standards in different blocks is different.
6. The coal roadway stripe region space-time risk coordinated extraction method according to claim 3, characterized in that extraction standard reaching time of the blocks is adjusted by changing extraction radii of different blocks.
7. The coal roadway stripe region space-time risk coordination extraction method according to claim 1, wherein in the step S5, the adjustment of permeability increasing technologies of different blocks comprises hydraulic reaming or hydraulic slotting.
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| CN105257335A (en) * | 2015-10-16 | 2016-01-20 | 中国矿业大学 | Ground drilling well extraction pressure relief coal seam and goaf gas effect evaluation and control method |
| CN106246141A (en) * | 2016-08-03 | 2016-12-21 | 中煤科工集团重庆研究院有限公司 | Boring based on coal mine gas drainage capability forecasting quantifies subregion optimizing method for disposing |
| CN106894837A (en) * | 2017-03-20 | 2017-06-27 | 中国矿业大学 | A kind of progressive protected type gas release pumping method |
| CN107605536A (en) * | 2017-11-02 | 2018-01-19 | 湖南科技大学 | Coal and gas prominent real-time early warning device and method based on Multi-source Information Fusion |
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