CN117708469A - Supplementary drilling track calculation method and system based on gas extraction blank area identification - Google Patents
Supplementary drilling track calculation method and system based on gas extraction blank area identification Download PDFInfo
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Abstract
The invention provides a complementary drilling track calculation method and a complementary drilling track calculation system based on gas extraction blank area recognition, and relates to the technical field of coal mine exploration, wherein the method comprises the following steps: and after primary drilling extraction is carried out on the coal bed, constructing a three-dimensional map of the coal bed, and intercepting a plurality of coal bed sections. And calculating to obtain the blank area range in each coal seam section according to the extraction radius and the projection point coordinates of the actual drilling track on each coal seam section, wherein the blank area range comprises a plurality of sub-blank areas. And further calculating the coordinates of the central point of the sub-blank area. And finally constructing a supplementary drilling track according to the coordinates of the central points of the same group of sub-blank areas. After the gas is extracted from the primary drilling hole by the method, an extraction blank area in the coal layer can be calculated, and then a supplementary drilling track is calculated; and the construction staff can conveniently conduct supplementary drilling on the coal bed according to the supplementary drilling track. Meanwhile, by adopting the additional drilling and supplementing mode, the residual gas in the coal bed after the gas is extracted by the primary drilling is effectively reduced, and the risk of gas outburst in the coal mining process is reduced.
Description
Technical Field
The invention relates to the technical field of coal mine exploration, in particular to a method and a system for calculating a complementary drilling track based on gas extraction blank area identification.
Background
The gas in the coal seam refers to natural gas existing in the coal seam, and the main component is methane, and also comprises a small amount of gases such as ethane, propane, nitrogen, carbon dioxide and the like. These gases are generated during formation of the coal seam by decomposition of organic matter and pressure. In the actual coal mining process, the gas in the coal bed needs to be extracted first, so that the gas outburst is avoided in the mining process.
In the prior art, the mode of extracting the gas in the coal seam is as follows: and uniformly marking a plurality of hole sites along a section in the region of the coal seam, and drilling holes at each hole site to extract gas. Because the extraction range of gas extracted from one drilling hole is limited, the extraction ranges among a plurality of drilling holes are required to be overlapped with each other, so that the whole coal seam is ensured to be covered by the extraction ranges of the drilling holes.
However, due to the influence of various complex factors in the drilling process, the track of the drilling hole is generally more and more deviated from the preset track along with the increase of the drilling depth; this results in the possible presence of a gas drainage blank zone in the coal seam. If the drilling holes are not supplemented to carry out the supplementary exploitation of the gas in the extraction blank area, the risk of gas outburst still exists. How to calculate the drilling track of the complementary drilling of the extraction blank area becomes a problem to be solved.
Disclosure of Invention
In view of the above-described drawbacks or deficiencies of the prior art, it is desirable to provide a supplemental borehole trajectory calculation method and system based on gas drainage blank zone identification.
In one aspect, the invention provides a method for calculating a complementary drilling track based on gas extraction blank area identification, comprising the following steps:
acquiring a three-dimensional map of a coal seam; the three-dimensional map comprises actual drilling tracks of a plurality of drilling holes in the process of extracting gas from the primary drilling holes;
intercepting a plurality of first coal seam sections perpendicular to a first direction in the three-dimensional map at first set intervals along the first direction; each first coal seam section has a different drilling depth; the first coal seam section comprises projection point coordinates of all actual drilling tracks on the first coal seam section; the first direction is parallel to the direction of a preset drilling track;
acquiring the extraction radius of a drilling hole;
calculating the range of the extraction blank area in all the first coal seam sections according to the extraction radius and all the projection point coordinates, and obtaining the blank area range in each first coal seam section; the blank region range comprises a plurality of sub-blank regions;
calculating coordinates of central points of the sub-blank areas in the section of the first coal seam to which the central points belong to obtain a plurality of central coordinates;
acquiring a plurality of center coordinate sets; each center coordinate set comprises center coordinates of a sub-blank area in each first coal seam section in a plurality of first coal seam sections, and the distance between the center coordinates of two sub-blank areas of adjacent first coal seam sections is smaller than a second set interval;
and calculating to obtain a supplementary drilling track according to a plurality of the central coordinates contained in the central coordinate set.
According to the technical scheme provided by the invention, the step of acquiring the three-dimensional map comprises the following steps:
drawing an initial three-dimensional map of the coal seam; the initial three-dimensional map comprises the spatial distribution of the coal seam;
acquiring a preset drilling track of each drilling hole;
acquiring a change curve of the offset of each drilling hole along a second direction and the preset drilling track along with the drilling depth, and obtaining a plurality of first offset curves; the second direction is perpendicular to the first direction;
obtaining a change curve of the offset of each drilling hole along a third direction and the preset drilling track along with the drilling depth, and obtaining a plurality of second offset curves; the third direction is perpendicular to the first direction and perpendicular to the second direction;
calculating to obtain actual drilling tracks of a plurality of drilling holes according to the first offset curves, the second offset curves and the preset drilling track of each drilling hole;
and drawing actual drilling tracks of a plurality of drilling holes in the initial three-dimensional map to obtain the three-dimensional map.
According to the technical scheme provided by the invention, according to the extraction radius and all the projection point coordinates, the step of calculating the range of the extraction blank area in all the first coal seam sections to obtain the blank area range in each first coal seam section comprises the following steps:
s31, acquiring projection coordinates of all actual drilling tracks in an ith first coal seam section to obtain a plurality of ith projection coordinates; the initial value of i is set to 1;
s32, calculating a region with the distance between each ith projection coordinate being greater than the extraction radius according to a plurality of ith projection coordinates and the extraction radius to obtain an ith blank region range;
s33, judging: if i is equal to N, go to step S34; otherwise, the value of i is increased by 1, and the steps S31-S33 are repeated; n is equal to the number of the sections of the first coal seam at present;
and S34, taking the 1 st blank area range to the N th blank area range as the blank area range in each first coal seam section in sequence, wherein the blank area range comprises a plurality of sub-blank areas.
According to the technical scheme provided by the invention, before the step S31 is performed, the method further comprises the following steps:
acquiring an initial drilling depth; the initial drilling depth represents the drilling depth at which the distance between the actual drilling track and the preset drilling track along the direction perpendicular to the first direction is equal to a third set value;
and sequentially taking the first coal seam sections with the drilling depth larger than the initial drilling depth as the 1 st first coal seam section to the N first coal seam section.
According to the technical scheme provided by the invention, the step S32 specifically comprises the following steps:
uniformly setting a plurality of sampling points in the ith first coal seam section at fourth set intervals to obtain a plurality of ith sampling points;
calculating the distance from each ith sampling point to all the ith projection coordinates in the ith first coal seam section;
dividing the ith sampling points with the distances to all the ith projection coordinates being larger than the extraction radius into a blank area range to obtain an ith blank area range.
According to the technical scheme provided by the invention, the step of calculating the coordinates of the central points of the sub-blank areas in the section of the first coal seam to which the central points belong to obtain a plurality of central coordinates comprises the following steps:
acquiring coordinates of all ith sampling points in the ith blank area range;
calculating the distance between all the ith sampling points;
dividing the ith sampling point with the distance equal to the fourth set interval into the same sub-blank area;
and calculating the coordinate average value of all the ith sampling points contained in the sub-blank areas to obtain a plurality of center coordinates.
According to the technical scheme provided by the invention, the step of calculating the supplementary drilling track according to the plurality of center coordinates contained in the center coordinate set comprises the following steps:
and fitting the track of the complementary drilling holes in the three-dimensional map by using a least square method according to the plurality of center coordinates contained in each group to obtain the complementary drilling hole track of the sub-blank area corresponding to each group.
According to the technical scheme provided by the invention, after the complementary drilling tracks of each group of corresponding sub-blank areas are obtained, the method further comprises the following steps:
acquiring the complementary drilling track to be compensated;
calculating a plurality of actual drilling tracks which are shortest from the supplementary drilling track along a direction perpendicular to the first direction at the maximum drilling depth to obtain a plurality of reference actual drilling tracks;
acquiring the offset at the maximum drilling depth in a plurality of first offset curves corresponding to a plurality of reference actual drilling tracks to obtain a plurality of first offsets;
obtaining the offset at the maximum drilling depth in a plurality of second offset curves corresponding to a plurality of reference actual drilling tracks, so as to obtain a plurality of second offset;
calculating the average value of the first offset values to obtain a first offset average value;
calculating the average value of the second offset values to obtain a second offset average value;
performing opposite-direction translation on the supplementary drilling track according to the first offset average value and the second offset average value to obtain an offset supplementary drilling track;
the offset supplemental drill trajectory is taken as the final supplemental drill trajectory.
According to the technical scheme provided by the invention, the step of acquiring the complementary drilling track to be compensated comprises the following steps:
s91, calculating a plurality of actual drilling tracks with shortest distances from a jth supplementary drilling track along a direction perpendicular to a first direction at the maximum drilling depth to obtain a plurality of jth actual drilling tracks;
s92, calculating a plurality of j actual drilling tracks and j average offset at the maximum drilling depth;
s93, judging: when the j-th average offset is greater than a fifth set value, performing steps S94-S95; otherwise, go to step S95;
s94, taking the jth supplementary drilling track as the jth supplementary drilling track to be compensated;
s95, judging: ending the cycle when j equals the total number of the supplemental borehole trajectories; otherwise, let j value add 1 and repeat steps S91-S93.
In another aspect, the present invention provides a supplemental borehole trajectory calculation system based on gas extraction blank zone identification, comprising:
the data processing module is used for carrying out the following steps:
acquiring a three-dimensional map of a coal seam; the three-dimensional map comprises actual drilling tracks of a plurality of drilling holes in the process of extracting gas from the primary drilling holes;
intercepting a plurality of first coal seam sections perpendicular to a first direction in the three-dimensional map at first set intervals along the first direction; each first coal seam section has a different drilling depth; the first coal seam section comprises projection point coordinates of all actual drilling tracks on the first coal seam section; the first direction is parallel to the direction of a preset drilling track;
acquiring the extraction radius of a drilling hole;
calculating the range of the extraction blank area in all the first coal seam sections according to the extraction radius and all the projection point coordinates, and obtaining the blank area range in each first coal seam section; the blank region range comprises a plurality of sub-blank regions;
calculating coordinates of central points of the sub-blank areas in the section of the first coal seam to which the central points belong to obtain a plurality of central coordinates;
acquiring a plurality of center coordinate sets; each center coordinate set comprises center coordinates of a sub-blank area in each first coal seam section in a plurality of first coal seam sections, and the distance between the center coordinates of two sub-blank areas of adjacent first coal seam sections is smaller than a second set interval;
and calculating to obtain a supplementary drilling track according to a plurality of the central coordinates contained in the central coordinate set.
The invention has the beneficial effects that:
and after primary drilling extraction is carried out on the coal bed, constructing a three-dimensional map of the coal bed. Intercepting a plurality of coal seam sections in a three-dimensional map, and calculating to obtain a blank area range in each coal seam section according to the extraction radius and the projection point coordinates of the actual drilling track on each coal seam section, wherein the blank area range comprises a plurality of sub blank areas; and further calculating the coordinates of the central point of the sub-blank area. And taking the sub-blank areas which are close to each other along the direction of the preset drilling track as the same group, and finally constructing a supplementary drilling track according to the central point coordinates of the sub-blank areas of the same group. After the gas is extracted from the primary drilling hole by the method, an extraction blank area in the coal layer can be calculated, and then a supplementary drilling track is calculated according to the extraction blank area; and the construction staff can conveniently conduct supplementary drilling on the coal bed according to the supplementary drilling track. The method for carrying out additional drilling and supplementary mining on the blank area effectively reduces the residual gas in the coal bed after the primary drilling and mining of the gas, and reduces the risk of gas outburst in the coal mining process. Meanwhile, the positions of the hollow white areas in the coal bed are calculated, then the center coordinates of the sections of the coal beds are calculated according to the specific positions, the compensating drilling track is drawn, and the compensating drilling mode is carried out, so that blind drilling times can be reduced, and the mining cost is reduced.
Drawings
Other features, objects and advantages of the present invention will become more apparent upon reading of the detailed description of non-limiting embodiments, made with reference to the accompanying drawings in which:
FIG. 1 is a flow chart of a complementary borehole trajectory calculation method based on gas extraction blank zone identification;
FIG. 2 is a flow chart for calculating the range of a blank area;
FIG. 3 is a schematic flow chart of calculating the supplemental borehole trajectory to be compensated;
FIG. 4 is a schematic illustration of a three-dimensional map;
FIG. 5 is a schematic diagram of a cross section of a coal seam;
FIG. 6 is a schematic illustration of one borehole arrangement for primary borehole gas extraction;
FIG. 7 is a graph of borehole trajectory offset along a third direction as a function of borehole depth;
FIG. 8 is a graph of borehole trajectory offset in a second direction as a function of borehole depth;
FIG. 9 is a schematic illustration of offset of supplemental borehole trajectory;
FIG. 10 is a schematic illustration of the compensated supplemental borehole trajectory;
wherein: 1. a three-dimensional map; 2. an actual drilling trajectory; 3. a first coal seam section; 4. extracting range; 5. sub-blank areas; 6. supplementing a drilling track; 7. offset supplemental borehole trajectories.
Detailed Description
The invention is described in further detail below with reference to the drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be noted that, for convenience of description, only the portions related to the invention are shown in the drawings.
It should be noted that, without conflict, the embodiments of the present invention and features of the embodiments may be combined with each other. The invention will be described in detail below with reference to the drawings in connection with embodiments.
Example 1
Specifically, the process of extracting gas from the primary drilling hole comprises the following steps:
detecting the region of the coal bed, and constructing an initial three-dimensional map 1 of the coal bed;
selecting an initial section convenient for drilling;
setting preset drilling tracks of a plurality of drilling holes in an initial section; the method comprises the steps that a preset drilling track is a linear track, and an initial position is in an initial section, so that extraction ranges 4 of a plurality of drilling holes cover the area where the whole coal bed is located;
and (3) primarily drilling each layer according to a plurality of preset drilling tracks, and further performing primary gas extraction.
The manner of setting the preset drilling tracks of the plurality of drilling holes in the initial section generally includes two manners:
forming a square between the initial positions of the plurality of drill holes, wherein the side length of the square is set as followsAnd (5) extracting the radius by times. Or referring to FIG. 6, a regular triangle is formed between the initial positions of the plurality of bores, and the side length of the regular triangle is set to +.>And (5) extracting the radius by times.
However, in the actual drilling process, due to the influence of various complex factors, the actual drilling track 2 is difficult to keep consistent with the preset drilling track, and usually offset is generated; in most cases, the offset will increase as the depth of the borehole increases.
If the distance between adjacent drilling tracks increases along with the increase of the drilling depth, so that the extraction range 4 cannot cover the coal seam, an extracted blank area can appear. The gas in the blank area is not extracted, and when coal mine is mined, residual gas still can cause gas protrusion, and danger occurs.
The core invention points of the invention are as follows: calculating the position of residual gas in the coal bed according to an actual drilling track 2 in the process of extracting gas from the primary drilling, namely, extracting a blank area; and calculates the supplementary drilling trajectory 6 from the blank space.
After the supplementary drilling track 6 is obtained, the drilling equipment can conduct additional drilling according to the supplementary drilling track 6, gas in the blank area is completely extracted, residual gas in the coal seam is greatly reduced, and the risk of gas protrusion is effectively reduced.
Referring to fig. 1, the present invention provides a method for calculating a complementary drilling track 6 based on gas extraction blank area identification, including:
s1, acquiring a three-dimensional map 1 of a coal seam; the three-dimensional map 1 comprises actual drilling tracks 2 of a plurality of drilling holes in the process of extracting gas from the primary drilling holes;
s2, cutting a plurality of first coal seam sections 3 perpendicular to a first direction in the three-dimensional map 1 at first set intervals along the first direction; each of the first coal seam sections 3 has a different drilling depth; each first coal seam section 3 comprises the projection point coordinates of all actual drilling tracks 2 on the first coal seam section 3; the first direction is parallel to the direction of a preset drilling track;
s3, acquiring the extraction radius of the drilling hole;
s4, calculating the range of the extracted blank area in all the first coal seam sections 3 according to the extraction radius and the coordinates of all the projection points, and obtaining the blank area range in each first coal seam section 3; the blank region range comprises a plurality of sub-blank regions 5;
s5, calculating coordinates of central points of the sub-blank areas 5 in the first coal seam section 3 to which the central points belong to obtain a plurality of central coordinates;
s6, acquiring a plurality of center coordinate sets; each center coordinate set comprises center coordinates of one sub-blank area 5 in each first coal seam section 3 in a plurality of first coal seam sections 3, and the distance between the center coordinates of two sub-blank areas 5 of adjacent first coal seam sections 3 is smaller than a second set interval;
and S7, calculating to obtain a supplementary drilling track 6 according to a plurality of center coordinates contained in the center coordinate set.
Specifically, the actual drilling trajectory 2 is the same as the initial position of the corresponding preset drilling trajectory.
There may be a plurality of non-extracted areas not communicating with each other between the actual drilling tracks 2.
In this embodiment, all the non-extracted areas in the whole coal seam are referred to as extraction blank areas; all non-extracted areas in one first coal seam section 3 are called blank area ranges; the non-extracted areas of the first coal seam section 3, which are not communicated with each other, are respectively used as a plurality of sub-blank areas 5. Thus, the blank region range includes a plurality of sub-blank regions 5.
The mode that the supplementary drilling track 6 passes through the center point of the sub-blank zone 5 can ensure that the gas extraction efficiency of the supplementary drilling track 6 is as high as possible, and the condition that the gas extraction blank zone still exists after the supplementary drilling is reduced.
Specifically, the central coordinate set may include sub-blank areas 5 of a part of the first coal seam section 3, and only one sub-blank area 5 of one first coal seam section 3 belongs to the same central coordinate set. In order to avoid center coordinates of a plurality of different blank areas from being connected incorrectly.
In some embodiments, the first set interval is set to any particular value between 0.5 meters, 2 meters, or 0.5 and 2.
The second set interval is calculated according to a formula I;
formula one;
wherein,d 1 a first set interval is indicated and a first set interval is indicated,d 2 a second set interval is indicated and is indicated,representing the maximum offset value. The maximum value of the offset represents all actual valuesThe drilling trajectory 2 is offset by the maximum amount from the preset drilling trajectory. />Calculated from the offset along the X-axis and the offset along the Y-axis.
In some embodiments, there may be two sub-blank areas 5 in the adjacent two first coal seam sections 3, where the smaller drilling depth is located at a distance from the smaller drilling depth of one sub-blank area 5 in the first coal seam section 3, which is greater than the second set interval. In this case, two sub-blank areas 5 with a small drilling depth are taken as one sub-blank area 5.
The center coordinates are coordinates of the center point in the three-dimensional map 1. Because the deviation of the non-extracted areas along the direction perpendicular to the drilling depth is not larger than the maximum deviation of the drilling track, when the distance between two center coordinates is smaller than the second set interval, the two sub-blank areas 5 on two adjacent first coal seam sections 3 belong to the same non-extracted area, and are further divided into the same group; and when the distance between the two center coordinates is larger than a second set interval, the two center coordinates are indicated to belong to different non-extracted areas.
And finally constructing and obtaining a supplementary drilling track 6 according to a plurality of center coordinates. The method for carrying out additional drilling and supplementary mining on the blank area effectively reduces the residual gas in the coal bed after the primary drilling and mining of the gas, and reduces the risk of gas outburst in the coal mining process. Meanwhile, the positions of the hollow white areas in the coal bed are calculated, then the center coordinates of the sections of the coal beds are calculated according to the specific positions, the compensating drilling track is drawn, and the compensating drilling mode is carried out, so that blind drilling times can be reduced, and the mining cost is reduced.
Further, referring to fig. 4, the step of acquiring the three-dimensional map 1 includes:
drawing an initial three-dimensional map 1 of the coal seam; the initial three-dimensional map 1 comprises the spatial distribution of coal seams;
acquiring a preset drilling track of each drilling hole;
acquiring a change curve of the offset of each drilling hole along a second direction and the preset drilling track along with the drilling depth, and obtaining a plurality of first offset curves; the second direction is perpendicular to the first direction;
obtaining a change curve of the offset of each drilling hole along a third direction and the preset drilling track along with the drilling depth, and obtaining a plurality of second offset curves; the third direction is perpendicular to the first direction and perpendicular to the second direction;
calculating to obtain actual drilling tracks 2 of a plurality of drilling holes according to the first offset curves, the second offset curves and the preset drilling tracks of each drilling hole;
and drawing actual drilling tracks 2 of a plurality of drilling holes in the initial three-dimensional map 1 to obtain the three-dimensional map 1.
In particular, existing drilling equipment after actual drilling can obtain a curve of the offset as a function of drilling depth, including curves in a first direction and a second direction. Referring specifically to fig. 7-8, the borehole depth direction is parallel to the Z-axis, representing the first direction, the X-axis represents the second direction, and the Y-axis represents the third direction.
After the preset drilling track is obtained, the offset of the actual drilling track 2 at each drilling depth and the preset drilling track along the X axis and the Y axis can be calculated according to the first offset curve and the second offset curve, and then the coordinate of the actual drilling track 2, of a specific drilling depth, in the three-dimensional map 1 is calculated, and finally the actual drilling track 2 is obtained.
Further, referring to fig. 2, the step of calculating the range of the extracted blank area in all the first coal seam sections 3 according to the extracted radius and all the projection point coordinates, and obtaining the blank area range in each first coal seam section 3 includes:
s31, acquiring projection coordinates of all actual drilling tracks 2 in an ith first coal seam section 3 to obtain a plurality of ith projection coordinates; the initial value of i is set to 1;
s32, calculating a region with the distance between each ith projection coordinate being greater than the extraction radius according to a plurality of ith projection coordinates and the extraction radius to obtain an ith blank region range;
s33, judging: if i is equal to N, go to step S34; otherwise, the value of i is increased by 1, and the steps S31-S33 are repeated; n is equal to the number of the first coal seam sections 3 at present;
and S34, taking the 1 st blank area range to the N th blank area range as the blank area range in each first coal seam section 3 in sequence, wherein the blank area range comprises a plurality of sub-blank areas 5.
In some embodiments, referring to fig. 5, the distance between a point in the first coal seam section 3 and each projection coordinate is greater than the extraction radius, which indicates that the point is within the range of the blank zone.
Thus all points within the range of the blank area are calculated, i.e. equal to the calculated range of the blank area. The same processing method is performed on all the first coal seam sections 3, so that all points in the blank area range can be obtained, which is equivalent to obtaining all the blank area ranges.
Further, before step S31, the method further includes:
acquiring an initial drilling depth; the initial drilling depth represents the drilling depth at which the distance between the actual drilling track 2 and the preset drilling track along the direction perpendicular to the first direction is equal to a third set value;
and sequentially taking the first coal seam sections 3 with the drilling depth larger than the initial drilling depth as the 1 st first coal seam section 3 to the N first coal seam section 3.
In some embodiments, the third set point is set to 0.1 meters, 0.2 meters, or any specific value between 0.1 and 0.2.
In some embodiments, when the actual drilling trajectory 2 is not offset much, the blank area is formed in a small range, and in this case, the extraction range 4 of the additional drilling supplementary extraction is mostly an overlapping area with the primary extraction, resulting in extremely low cost performance of the additional drilling.
From practical observations, the narrow blank area range generally coincides with the larger blank area range along the depth direction of the drilling hole. The complementary borehole trajectory 6 thus calculated for a larger blank area range will generally also be around a narrow blank area range; the supplemental drill track 6 of the larger blank space range allows for the gas in the narrow blank space range to be extracted by the way.
In this embodiment, for simplifying the calculation, only the first coal seam section 3 corresponding to which the offset is larger than the third set value is selected. For example, there is originally the 1 st to 100 th first coal seam section 3, so the original N value is set to 100; after the steps of this embodiment, the original 11 th to 100 th first coal seam sections 3 are re-used as 1 st to 90 th first coal seam sections 3, so the N value is set to 90.
Further, the step S32 specifically includes:
uniformly setting a plurality of sampling points in the ith first coal seam section 3 at fourth set intervals to obtain a plurality of ith sampling points;
calculating the distance from each ith sampling point to all the ith projection coordinates in the ith first coal seam section 3;
dividing the ith sampling points with the distances to all the ith projection coordinates being larger than the extraction radius into a blank area range to obtain an ith blank area range.
In some embodiments, the blank area is calculated by uniformly setting a plurality of sampling points in each first coal seam section 3, and the arrangement of the sampling points can be set to a plurality of square forming modes or a plurality of regular triangle forming modes.
The distance between two adjacent sampling points is equal to the fourth set interval. The fourth setting interval is generally less than twice the third setting.
The sampling points are set and calculated, and the calculation amount can be further reduced by only calculating the distance between all the sampling points and each projection coordinate, so that all the blank area ranges can be calculated more rapidly when the scheme is carried out on a larger coal seam.
Further, the step of calculating coordinates of the center points of the plurality of sub-blank areas 5 in the first coal seam section 3 to which the coordinates belong to obtain a plurality of center coordinates includes:
acquiring coordinates of all ith sampling points in the ith blank area range;
calculating the distance between all the ith sampling points;
dividing the ith sampling point with the distance equal to the fourth set interval into the same sub-blank area 5;
and calculating the coordinate average value of all the ith sampling points contained in the plurality of sub-blank areas 5 to obtain a plurality of center coordinates.
In this embodiment, the clustering concept is used to determine whether to connect according to the distance between sampling points, and then divide the sampling points into the same sub-blank area 5.
If the distance between the first sampling point and the second sampling point is equal to the fourth set interval, the distance between the second sampling point and the third sampling point is equal to the fourth set interval, and the distance between the first sampling point and the third sampling point is greater than the fourth set interval, the three sampling points are all divided into the same sub-blank area 5.
Since the above scheme has set a plurality of sampling points, the embodiment directly calculates the center coordinates by adopting a mode of calculating the average coordinates of the sampling points, and since the sub-blank area 5 generally has only a few sampling points, the calculation amount is small, and the calculation efficiency is higher.
Further, the step of calculating the supplementary drilling trajectory 6 from a plurality of the center coordinates included in the center coordinate set includes:
and fitting the tracks of the complementary drill holes in the three-dimensional map 1 by using a least square method according to a plurality of central coordinates contained in each group to obtain complementary drill hole tracks 6 of the sub-blank areas 5 corresponding to each group.
In particular, in order to enable one complementary borehole trajectory 6 to pass through all sub-blank areas 5 where a set of central coordinates is located, it is necessary to fit the complementary borehole trajectory 6. There are many known methods for fitting a straight line with a plurality of coordinates, and the least square method is selected for fitting in this embodiment. The least square fitting straight line belongs to the prior art and is not described herein in detail.
Further, after obtaining the complementary drilling tracks 6 of each group of the sub-blank areas 5, the method further includes:
acquiring the supplementary drilling track 6 to be compensated;
calculating a plurality of actual drilling tracks 2 shortest from the supplementary drilling track 6 along a direction perpendicular to the first direction at the maximum drilling depth to obtain a plurality of reference actual drilling tracks 2;
acquiring the offset at the maximum drilling depth in a plurality of first offset curves corresponding to a plurality of reference actual drilling tracks 2, so as to obtain a plurality of first offsets;
obtaining the offset at the maximum drilling depth in a plurality of second offset curves corresponding to a plurality of reference actual drilling tracks 2, so as to obtain a plurality of second offset;
calculating the average value of the first offset values to obtain a first offset average value;
calculating the average value of the second offset values to obtain a second offset average value;
according to the first offset average value and the second offset average value, carrying out opposite-direction translation on the supplementary drilling track 6 to obtain an offset supplementary drilling track 7;
the offset supplemental drill trajectory 7 is taken as the final supplemental drill trajectory 6.
Specifically, referring to fig. 9, the supplemental drilling trajectory 6 also shifts during the actual drilling process, so that the actual supplemental drilling trajectory 6 cannot pass through the center coordinates, eventually resulting in residual gas still being present.
In order to solve the above problem, after the complementary drilling trajectory 6 is calculated, the complementary drilling trajectory 6 needs to be compensated, so that the compensated complementary drilling trajectory 6 can pass through the center coordinates.
In some embodiments, the complementary drilling trajectory 6 to be compensated is calculated at the maximum drilling depth, from the nearest 4 reference actual drilling trajectories 2, and further a first offset mean value and a second offset mean value of the 4 reference actual drilling trajectories 2 at the maximum drilling depth are calculated.
And translating the supplementary drilling track 6 according to the first offset average value and the second offset average value to obtain a final supplementary drilling track 6.
For example, referring to fig. 7-8, where the first offset average is-2 and the second offset average is +1, the average offset of 4 reference actual borehole trajectories 2 may be expressed as 2 units offset in the negative X-axis direction, as 1 unit offset in the positive Y-axis direction.
Thus, the way the opposite direction translates is: the supplemental borehole trajectory 6 is translated 2 units in the positive X-axis direction and 1 unit in the negative Y-axis direction. The offset compensated borehole trajectory 7 is finally compensated as shown in fig. 10.
Further, referring to fig. 3, the step of obtaining the supplementary drilling trajectory 6 to be compensated comprises:
s91, calculating a plurality of actual drilling tracks 2 which are shortest away from a jth supplementary drilling track 6 along a direction perpendicular to a first direction at the maximum drilling depth to obtain a plurality of jth actual drilling tracks 2;
s92, calculating a plurality of j-th actual drilling tracks 2, and j-th average offset at the maximum drilling depth;
s93, judging: when the j-th average offset is greater than a fifth set value, performing steps S94-S95; otherwise, go to step S95;
s94, taking the jth supplementary drilling track 6 as the jth supplementary drilling track 6 to be compensated;
s95, judging: ending the cycle when j equals the total number of said supplementary drilling tracks 6; otherwise, let j value add 1 and repeat steps S91-S93.
Specifically, the plurality of actual drilling trajectories 2 that are shortest from the jth supplemental drilling trajectory 6. It can be understood that: the distances from the actual drilling tracks 2 to the jth supplementary drilling track 6 are arranged from small to large, and are as follows: 1,2,3,4,5, 6; the four actual drilling trajectories 2 that are shortest from the jth supplementary drilling trajectory 6 are separated from the four actual drilling trajectories 2 for which the jth supplementary drilling trajectory 6 is 1,2,3, 4.
If the offset of the supplementary drilling track 6 is small, the extraction range 4 can still cover the blank area 5, and compensation is not required. Thus, before compensation is performed in the above-described manner, it is necessary to determine whether the supplementary drilling trajectory 6 needs to be compensated.
The judging method comprises the following steps:
calculating the average offset of four practical drilling tracks 2 with the nearest surrounding distances;
further judging the average offset and the fifth set value; the fifth set value can be set to be half of the extraction radius;
if the value is larger than the fifth set value, compensation is needed; if the position of the supplemental drill track 6 is smaller than or equal to the fifth set value, compensation is not needed, and the supplemental drill track 6 can pass through all center coordinates of the same group.
If the supplemental drilling track 6 is used as the supplemental drilling track 6 to be compensated, the subsequent calculation process may directly take the average offset in the present embodiment as the offset average value of the previous embodiment.
Example 2
The invention also provides a complementary drilling track 6 computing system based on gas extraction blank area recognition, which comprises:
the data processing module is used for carrying out the following steps:
s1, acquiring a three-dimensional map 1 of a coal seam; the three-dimensional map 1 comprises actual drilling tracks 2 of a plurality of drilling holes in the process of extracting gas from the primary drilling holes;
s2, cutting a plurality of first coal seam sections 3 perpendicular to a first direction in the three-dimensional map 1 at first set intervals along the first direction; each of the first coal seam sections 3 has a different drilling depth; each first coal seam section 3 comprises the projection point coordinates of all actual drilling tracks 2 on the first coal seam section 3; the first direction is parallel to the direction of a preset drilling track;
s3, acquiring the extraction radius of the drilling hole;
s4, calculating the range of the extracted blank area in all the first coal seam sections 3 according to the extraction radius and the coordinates of all the projection points, and obtaining the blank area range in each first coal seam section 3; the blank region range comprises a plurality of sub-blank regions 5;
s5, calculating coordinates of central points of the sub-blank areas 5 in the first coal seam section 3 to which the central points belong to obtain a plurality of central coordinates;
s6, acquiring a plurality of center coordinate sets; each center coordinate set comprises center coordinates of one sub-blank area 5 in each first coal seam section 3 in a plurality of first coal seam sections 3, and the distance between the center coordinates of two sub-blank areas 5 of adjacent first coal seam sections 3 is smaller than a second set interval;
and S7, calculating to obtain a supplementary drilling track 6 according to a plurality of center coordinates contained in the center coordinate set.
Specifically, there may be a plurality of non-extracted regions that are not in communication with each other due to the plurality of actual borehole trajectories 2.
In this embodiment, the steps of the previous embodiment are performed using a data processing module, including:
all non-extracted areas in the whole coal seam are called extraction blank areas; all non-extracted areas in one first coal seam section 3 are called blank area ranges; the non-extracted areas of the first coal seam section 3, which are not communicated with each other, are respectively used as a plurality of sub-blank areas 5. Thus, the blank region range includes a plurality of sub-blank regions 5.
The mode that the supplementary drilling track 6 passes through the center point of the sub-blank zone 5 can ensure that the gas extraction efficiency of the supplementary drilling track 6 is as high as possible, and the condition that the gas extraction blank zone still exists after the supplementary drilling is reduced.
Specifically, after the compensated drilling track is obtained, the drilling equipment performs additional drilling according to the compensated drilling track to extract gas in the blank area.
The above description is only illustrative of the preferred embodiments of the present invention and of the principles of the technology employed. It will be appreciated by persons skilled in the art that the scope of the invention referred to in the present invention is not limited to the specific combinations of the technical features described above, but also covers other technical features formed by any combination of the technical features described above or their equivalents without departing from the inventive concept. Such as the above-mentioned features and the technical features disclosed in the present invention (but not limited to) having similar functions are replaced with each other.
Claims (10)
1. The method for calculating the supplementary drilling track based on the gas extraction blank area identification is characterized by comprising the following steps of:
acquiring a three-dimensional map of a coal seam; the three-dimensional map comprises actual drilling tracks of a plurality of drilling holes in the process of extracting gas from the primary drilling holes;
intercepting a plurality of first coal seam sections perpendicular to a first direction in the three-dimensional map at first set intervals along the first direction; each first coal seam section has a different drilling depth; the first coal seam section comprises projection point coordinates of all actual drilling tracks on the first coal seam section; the first direction is parallel to the direction of a preset drilling track;
acquiring the extraction radius of a drilling hole;
calculating the range of the extraction blank area in all the first coal seam sections according to the extraction radius and all the projection point coordinates, and obtaining the blank area range in each first coal seam section; the blank region range comprises a plurality of sub-blank regions;
calculating coordinates of central points of the sub-blank areas in the section of the first coal seam to which the central points belong to obtain a plurality of central coordinates;
acquiring a plurality of center coordinate sets; each center coordinate set comprises center coordinates of a sub-blank area in each first coal seam section in a plurality of first coal seam sections, and the distance between the center coordinates of two sub-blank areas of adjacent first coal seam sections is smaller than a second set interval;
and calculating to obtain a supplementary drilling track according to a plurality of the central coordinates contained in the central coordinate set.
2. The method for calculating the supplementary drilling trajectory based on gas extraction blank area identification according to claim 1, wherein the step of acquiring the three-dimensional map comprises:
drawing an initial three-dimensional map of the coal seam; the initial three-dimensional map comprises the spatial distribution of the coal seam;
acquiring a preset drilling track of each drilling hole;
acquiring a change curve of the offset of each drilling hole along a second direction and the preset drilling track along with the drilling depth, and obtaining a plurality of first offset curves; the second direction is perpendicular to the first direction;
obtaining a change curve of the offset of each drilling hole along a third direction and the preset drilling track along with the drilling depth, and obtaining a plurality of second offset curves; the third direction is perpendicular to the first direction and perpendicular to the second direction;
calculating to obtain actual drilling tracks of a plurality of drilling holes according to the first offset curves, the second offset curves and the preset drilling track of each drilling hole;
and drawing actual drilling tracks of a plurality of drilling holes in the initial three-dimensional map to obtain the three-dimensional map.
3. The method for calculating a complementary drilling trajectory based on gas extraction blank area identification according to claim 1, wherein the step of calculating the ranges of the extraction blank areas in all the first coal seam sections according to the extraction radius and all the projection point coordinates, and obtaining the blank area range in each first coal seam section comprises the steps of:
s31, acquiring projection coordinates of all actual drilling tracks in an ith first coal seam section to obtain a plurality of ith projection coordinates; the initial value of i is set to 1;
s32, calculating a region with the distance between each ith projection coordinate being greater than the extraction radius according to a plurality of ith projection coordinates and the extraction radius to obtain an ith blank region range;
s33, judging: if i is equal to N, go to step S34; otherwise, the value of i is increased by 1, and the steps S31-S33 are repeated; n is equal to the number of the sections of the first coal seam at present;
and S34, taking the 1 st blank area range to the N th blank area range as the blank area range in each first coal seam section in sequence, wherein the blank area range comprises a plurality of sub-blank areas.
4. The method for calculating a supplemental drill hole trajectory based on gas extraction blank space recognition according to claim 3, further comprising, before performing step S31:
acquiring an initial drilling depth; the initial drilling depth represents the drilling depth at which the distance between the actual drilling track and the preset drilling track along the direction perpendicular to the first direction is equal to a third set value;
and sequentially taking the first coal seam sections with the drilling depth larger than the initial drilling depth as the 1 st first coal seam section to the N first coal seam section.
5. The method for calculating a complementary borehole trajectory based on gas extraction blank zone identification according to claim 3, wherein step S32 specifically comprises:
uniformly setting a plurality of sampling points in the ith first coal seam section at fourth set intervals to obtain a plurality of ith sampling points;
calculating the distance from each ith sampling point to all the ith projection coordinates in the ith first coal seam section;
dividing the ith sampling points with the distances to all the ith projection coordinates being larger than the extraction radius into a blank area range to obtain an ith blank area range.
6. The method for calculating the supplemental drilling trajectory based on gas extraction blank area identification according to claim 5, wherein the step of calculating coordinates of center points of the plurality of sub-blank areas in the section of the first coal seam to which the sub-blank areas belong to, to obtain a plurality of center coordinates, comprises:
acquiring coordinates of all ith sampling points in the ith blank area range;
calculating the distance between all the ith sampling points;
dividing the ith sampling point with the distance equal to the fourth set interval into the same sub-blank area;
and calculating the coordinate average value of all the ith sampling points contained in the sub-blank areas to obtain a plurality of center coordinates.
7. The method for calculating a supplementary drilling trajectory based on gas extraction blank area identification according to claim 2, wherein the step of calculating a supplementary drilling trajectory from a plurality of the center coordinates included in the center coordinate set comprises:
and fitting the track of the complementary drilling holes in the three-dimensional map by using a least square method according to the plurality of center coordinates contained in each group to obtain the complementary drilling hole track of the sub-blank area corresponding to each group.
8. The method for calculating the complementary drilling tracks based on the gas extraction blank region identification according to claim 7, wherein after obtaining the complementary drilling tracks of each group of the corresponding sub-blank regions, the method further comprises:
acquiring the complementary drilling track to be compensated;
calculating a plurality of actual drilling tracks which are shortest from the supplementary drilling track along a direction perpendicular to the first direction at the maximum drilling depth to obtain a plurality of reference actual drilling tracks;
acquiring the offset at the maximum drilling depth in a plurality of first offset curves corresponding to a plurality of reference actual drilling tracks to obtain a plurality of first offsets;
obtaining the offset at the maximum drilling depth in a plurality of second offset curves corresponding to a plurality of reference actual drilling tracks, so as to obtain a plurality of second offset;
calculating the average value of the first offset values to obtain a first offset average value;
calculating the average value of the second offset values to obtain a second offset average value;
performing opposite-direction translation on the supplementary drilling track according to the first offset average value and the second offset average value to obtain an offset supplementary drilling track;
the offset supplemental drill trajectory is taken as the final supplemental drill trajectory.
9. The method for calculating a supplemental drilling trajectory based on gas extraction blank space identification according to claim 8, wherein the step of acquiring the supplemental drilling trajectory to be compensated comprises:
s91, calculating a plurality of actual drilling tracks with shortest distances from a jth supplementary drilling track along a direction perpendicular to a first direction at the maximum drilling depth to obtain a plurality of jth actual drilling tracks;
s92, calculating a plurality of j actual drilling tracks and j average offset at the maximum drilling depth;
s93, judging: when the j-th average offset is greater than a fifth set value, performing steps S94-S95; otherwise, go to step S95;
s94, taking the jth supplementary drilling track as the jth supplementary drilling track to be compensated;
s95, judging: ending the cycle when j equals the total number of the supplemental borehole trajectories; otherwise, let j value add 1 and repeat steps S91-S93.
10. Supplementary drilling track calculation system based on gas drainage blank area discernment, its characterized in that includes:
the data processing module is used for carrying out the following steps:
acquiring a three-dimensional map of a coal seam; the three-dimensional map comprises actual drilling tracks of a plurality of drilling holes in the process of extracting gas from the primary drilling holes;
intercepting a plurality of first coal seam sections perpendicular to a first direction in the three-dimensional map at first set intervals along the first direction; each first coal seam section has a different drilling depth; the first coal seam section comprises projection point coordinates of all actual drilling tracks on the first coal seam section; the first direction is parallel to the direction of a preset drilling track;
acquiring the extraction radius of a drilling hole;
calculating the range of the extraction blank area in all the first coal seam sections according to the extraction radius and all the projection point coordinates, and obtaining the blank area range in each first coal seam section; the blank region range comprises a plurality of sub-blank regions;
calculating coordinates of central points of the sub-blank areas in the section of the first coal seam to which the central points belong to obtain a plurality of central coordinates;
acquiring a plurality of center coordinate sets; each center coordinate set comprises center coordinates of a sub-blank area in each first coal seam section in a plurality of first coal seam sections, and the distance between the center coordinates of two sub-blank areas of adjacent first coal seam sections is smaller than a second set interval;
and calculating to obtain a supplementary drilling track according to a plurality of the central coordinates contained in the central coordinate set.
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