CN118148602A - Method for improving drilling rate of coal seam for high-dip-angle coal seam horizontal well - Google Patents
Method for improving drilling rate of coal seam for high-dip-angle coal seam horizontal well Download PDFInfo
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- CN118148602A CN118148602A CN202410326281.3A CN202410326281A CN118148602A CN 118148602 A CN118148602 A CN 118148602A CN 202410326281 A CN202410326281 A CN 202410326281A CN 118148602 A CN118148602 A CN 118148602A
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- 239000003245 coal Substances 0.000 title claims abstract description 130
- 238000005553 drilling Methods 0.000 title claims abstract description 76
- 238000000034 method Methods 0.000 title claims abstract description 22
- 238000010586 diagram Methods 0.000 claims abstract description 27
- 238000005259 measurement Methods 0.000 claims abstract description 24
- 239000011435 rock Substances 0.000 claims abstract description 18
- 239000012634 fragment Substances 0.000 claims abstract description 6
- 238000005520 cutting process Methods 0.000 claims description 2
- 230000003111 delayed effect Effects 0.000 description 2
- 208000035126 Facies Diseases 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008021 deposition Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
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Abstract
The invention discloses a method for improving the drilling rate of a coal bed for a high-dip-angle coal bed horizontal well, which comprises the following steps of 100, drawing a predicted coal bed target area diagram of a horizontal travel track of an area where a well is located; step 200, determining key data points of a horizontal section according to the drawn predicted coal seam target area diagram, and designing a borehole track of the well drilling; step 300, horizontal drilling is carried out according to a designed well track, well deviation azimuth data, logging gas measurement data, rock fragments and azimuth gamma data are tracked while drilling in real time, and the predicted coal seam target area diagram is corrected to obtain real-time drilling coal seam data; 400, redetermining a new borehole track in the corrected predicted coal seam target area diagram, calculating the distance between the new borehole track and the coal seam boundary, and adjusting the position of the new borehole track, thereby ensuring the crossing drilling rate of the high-dip-angle coal seam horizontal section; and the position of the well track is timely judged, and the geological profile is corrected in real time, so that the drilling rate of the horizontal section is improved.
Description
Technical Field
The invention relates to the technical field of horizontal well drilling, in particular to a method for improving the drilling meeting rate of a coal seam for a high-dip-angle coal seam horizontal well.
Background
Conventional coal seam horizontal well drilling track control technology is mature, but is influenced by a deposition environment and structural evolution, when a high-dip-angle coal seam is drilled horizontally, due to the influence of an underground structure, the coal seam inclination, dip angle and thickness are also changed, such as local thinning of the coal seam and unstable coal seam mark layers; the rock phase combination of the top and bottom plates is complex and changeable under the influence of the sedimentary facies, the lithology characteristics of the coal bed and the top and bottom plates are not obvious, and the like, so that the drilling rate of the well track in the real drilling in the coal bed cannot meet the technical requirements.
In the prior art, the directional gamma while drilling is mostly adopted to control geosteering through a horizontal section track, but the method has the problems that the tool zero length is too long, the measurement is delayed and coal is easy to produce for the horizontal running of a high-dip-angle coal seam.
Disclosure of Invention
The invention aims to provide a method for improving the drilling meeting rate of a coal bed for a high-dip-angle coal bed horizontal well, which aims to solve the technical problems that in the prior art, a horizontal section track is used for controlling a geosteering azimuth gamma method while drilling, the zero length of a tool is too long, the measurement is delayed, and coal is easy to discharge.
In order to solve the technical problems, the invention specifically provides the following technical scheme:
a method for improving the drilling rate of a coal bed for a high-dip-angle coal bed horizontal well comprises the following steps:
step 100, drawing a predicted coal seam target area diagram of a horizontal travel track of an area where a well is located;
Step 200, determining key data points of a horizontal section according to the drawn predicted coal seam target area diagram, and designing a well track of drilling;
Step 300, performing actual horizontal drilling according to a designed well track, tracking measurement while drilling well deviation azimuth data, logging gas measurement data, rock fragments and azimuth gamma data in real time, and correcting the predicted coal seam target area diagram to obtain real drilling coal seam data;
step 400, redetermining a new borehole track in the corrected predicted coal seam target area diagram, calculating the distance between the new borehole track and the coal seam boundary, and adjusting the position of the new borehole track, thereby ensuring the crossing drilling rate of the high-dip-angle coal seam horizontal section.
In a preferred embodiment of the present invention, in step 100, when a target area map of the predicted coal seam is drawn, the boundary of the coal seam is drawn in combination with geological data, and the roof position, floor position, strike, inclination and thickness of the coal seam of the high-inclination coal seam are determined.
As a preferred embodiment of the present invention, in the step 200, the critical data points include landing points and targets of the horizontal segment;
after the predicted target area diagram of the coal seam is completed, drilling is simulated in the coal seam by adjusting the well inclination angle and the azimuth angle according to the target in the landing site on drilling software, so that the predicted well track is designed through the drilling software.
As a preferred embodiment of the present invention, in step 300, the position of the next inclinometry point is predicted based on measurement while drilling inclination azimuth data during real drilling, and the borehole trajectory is adjusted with reference to azimuth gamma data to prevent coal from being drilled.
In the actual drilling based on the predicted designed well track, the preferred scheme of the invention is that the actual well track is formed according to the well deviation azimuth data of the inclinometer at every 30 meters of the selected inclinometer along the predicted designed well track.
As a preferable scheme of the invention, when in actual horizontal drilling, a base point formed by predicted well deviation azimuth data is compared with a measuring point formed by actual well deviation azimuth data, and whether a well track extends along a design line is judged;
and meanwhile, judging whether the track is in the coal bed according to logging gas measurement data, rock debris and azimuth gamma data during actual horizontal drilling.
As a preferred embodiment of the present invention, actual well deviation azimuth data is determined from the coal seam thickness and the approximate coal seam travel obtained from the adjacent well.
As a preferable scheme of the invention, after the actual measured well deviation azimuth data, logging gas measurement data, rock debris and azimuth gamma data are obtained, the well inclination angle and azimuth angle of the drilling work are timely adjusted to correct the well track, so that the drilling is ensured to pass through the coal seam during drilling.
In step 300, logging gas data, cuttings, and azimuth gamma data are different between the boundary of the coal seam of the borehole trajectory and the inside of the coal seam of the borehole trajectory;
and judging whether the current borehole track is close to the roof of the coal bed, the floor of the coal bed or the inside of the coal bed according to the distribution numerical values of the logging gas measurement data, the rock fragments and the azimuth gamma data.
Compared with the prior art, the invention has the following beneficial effects:
According to the method, a coal seam target area diagram is established in the early stage, the well path is designed by adopting drilling software according to coal seam basic data, the position of the well path is judged in time by means of real-time acquired measurement while drilling data, gas logging, rock debris and other data, the geological profile diagram is corrected in real time, and the drilling rate of the horizontal section is improved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below. It will be apparent to those of ordinary skill in the art that the drawings in the following description are exemplary only and that other implementations can be obtained from the extensions of the drawings provided without inventive effort.
FIG. 1 is a schematic diagram of a predicted target area map of a coal seam according to an embodiment of the present invention;
FIG. 2 is a schematic illustration of a borehole trajectory for a real drill provided by an embodiment of the present invention;
FIG. 3 is a schematic diagram of calculating a coal seam strike alpha according to an embodiment of the present invention
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
As shown in fig. 1 to 3, the invention provides a method for improving the drilling rate of a coal seam for a high-dip-angle coal seam horizontal well, which comprises the following steps:
And 100, drawing a predicted coal seam target area diagram of the horizontal travel track of the area where the well is located.
In step 100, when a predicted target area diagram of the coal seam is drawn, the boundary of the coal seam is drawn in combination with geological data, and the position of the roof of the coal seam, the position of the floor of the coal seam, the trend of the coal seam, the inclination angle of the coal seam and the thickness of the coal seam are determined.
The predicted target region map of the coal seam is specifically a geological section model map.
And 200, determining key data points of a horizontal section according to the drawn predicted coal seam target area diagram, and designing a well track of the well drilling.
In the step 200, the critical data points include landing sites and targets of the horizontal segment;
after the predicted target area diagram of the coal seam is completed, drilling is simulated in the coal seam by adjusting the well inclination angle and the azimuth angle according to the target in the landing site on drilling software, so that the predicted well track is designed through the drilling software.
And 300, performing actual horizontal drilling according to the designed well track, tracking measurement while drilling well deviation azimuth data, logging gas measurement data, rock debris and azimuth gamma data in real time, and correcting the predicted coal seam target area diagram to obtain real-time drilling coal seam data.
In step 300, based on measurement while drilling well deviation azimuth data in the real drilling process, predicting the position of the next deviation measuring point according to a deviation rule, and adjusting the well track by referring to azimuth gamma data to prevent coal from being drilled.
The inclination measuring points are specifically selected as follows:
in actual drilling based on the predicted designed well track, each 30 meters of selected inclinations points along the predicted designed well track form an actual well track according to well inclination azimuth data of the inclinations points, so that the well track is formed by connecting different inclinations points.
When the well is actually drilled horizontally, a base point formed by the predicted well deviation azimuth data is compared with a measuring point formed by the actual well deviation azimuth data, and whether the well track extends along the design line is judged.
And meanwhile, judging whether the track is in the coal bed according to logging gas measurement data, rock debris and azimuth gamma data during actual horizontal drilling.
The judging mode is as follows: logging gas measurement data, rock debris and azimuth gamma data in the coal bed boundary of the well track are different;
and judging whether the current borehole track is close to the roof of the coal bed, the floor of the coal bed or the inside of the coal bed according to the distribution numerical values of the logging gas measurement data, the rock fragments and the azimuth gamma data.
Step 400, redetermining a new borehole track in the corrected predicted coal seam target area diagram, calculating the distance between the new borehole track and the coal seam boundary, and adjusting the position of the new borehole track, thereby ensuring the crossing drilling rate of the high-dip-angle coal seam horizontal section.
The actual drilling coal seam data obtained in the actual drilling work specifically determine the actual well deviation azimuth data from the coal seam thickness and the approximate coal seam direction obtained by the adjacent well, and the logging gas logging data, the rock debris and the azimuth gamma data are obtained in the actual drilling process.
After the actual measured well inclination azimuth data, logging gas measurement data, rock debris and azimuth gamma data are obtained, the well inclination angle and azimuth angle of the drilling work are timely adjusted to correct the well track, so that the drilling work is ensured to pass through the coal seam during drilling.
According to the method, the coal seam target area diagram is established in the early stage, the well path is designed by adopting drilling software according to coal seam basic data, the position of the well path is timely judged by means of measurement while drilling data and gas logging, rock debris and other data obtained in real time, the geological profile diagram is corrected in real time, and the drilling rate of the horizontal section is improved.
The above embodiments are only exemplary embodiments of the present application and are not intended to limit the present application, the scope of which is defined by the claims. Various modifications and equivalent arrangements of this application will occur to those skilled in the art, and are intended to be within the spirit and scope of the application.
Claims (9)
1. The method for improving the drilling rate of the coal bed for the high-dip-angle coal bed horizontal well is characterized by comprising the following steps of:
step 100, drawing a predicted coal seam target area diagram of a horizontal travel track of an area where a well is located;
Step 200, determining key data points of a horizontal section according to the drawn predicted coal seam target area diagram, and designing a well track of drilling;
Step 300, performing actual horizontal drilling according to a designed well track, tracking measurement while drilling well deviation azimuth data, logging gas measurement data, rock fragments and azimuth gamma data in real time, and correcting the predicted coal seam target area diagram to obtain real drilling coal seam data;
step 400, redetermining a new borehole track in the corrected predicted coal seam target area diagram, calculating the distance between the new borehole track and the coal seam boundary, and adjusting the position of the new borehole track, thereby ensuring the crossing drilling rate of the high-dip-angle coal seam horizontal section.
2. The method for improving the drilling rate of the coal seam of the high-dip-angle coal seam horizontal well according to claim 1, wherein,
In step 100, when a predicted target area diagram of the coal seam is drawn, the boundary of the coal seam is drawn in combination with geological data, and the position of the roof of the coal seam, the position of the floor of the coal seam, the trend of the coal seam, the inclination angle of the coal seam and the thickness of the coal seam are determined.
3. The method for improving the drilling rate of the coal seam of the high-dip-angle coal seam horizontal well according to claim 1, wherein,
In the step 200, the critical data points include landing sites and targets of the horizontal segment;
after the predicted target area diagram of the coal seam is completed, drilling is simulated in the coal seam by adjusting the well inclination angle and the azimuth angle according to the target in the landing site on drilling software, so that the predicted well track is designed through the drilling software.
4. The method for improving the drilling rate of the coal seam of the high-dip-angle coal seam horizontal well according to claim 1, wherein,
In step 300, the position of the next survey point is predicted based on measurement while drilling well deviation azimuth data during real drilling, and the borehole trajectory is adjusted with reference to azimuth gamma data to prevent coal from being drilled.
5. The method for increasing the drilling rate of the coal seam of the high-dip-angle coal seam horizontal well according to claim 4, wherein,
In actual drilling based on the predicted designed borehole trajectory, an actual borehole trajectory is formed according to the well inclination azimuth data of the inclinometer at every 30 meters of the selected inclinometer along the predicted designed borehole trajectory.
6. A method for increasing the drilling rate of a high-dip coal seam horizontal well according to claim 1 or 5,
When in actual horizontal drilling, comparing a base point formed by predicted well deviation azimuth data with a measuring point formed by actual well deviation azimuth data to judge whether the well track extends along a design line;
and meanwhile, judging whether the track is in the coal bed according to logging gas measurement data, rock debris and azimuth gamma data during actual horizontal drilling.
7. The method for increasing the drilling rate of the coal seam of the high-dip-angle coal seam horizontal well according to claim 6, wherein,
The actual well bore bias azimuth data is determined from the coal seam thickness, the approximate coal seam travel direction obtained from the adjacent well.
8. The method for increasing the drilling rate of the coal seam of the high-dip-angle coal seam horizontal well according to claim 6, wherein,
After the actual measured well inclination azimuth data, logging gas measurement data, rock debris and azimuth gamma data are obtained, the well inclination angle and azimuth angle of the drilling work are timely adjusted to correct the well track, so that the drilling work is ensured to pass through the coal seam during drilling.
9. The method for improving the drilling rate of the coal seam of the high-dip-angle coal seam horizontal well according to claim 1, wherein,
In step 300, logging gas data, cuttings and azimuth gamma data are different at the coal seam boundary of the borehole trajectory and inside the coal seam of the borehole trajectory;
and judging whether the current borehole track is close to the roof of the coal bed, the floor of the coal bed or the inside of the coal bed according to the distribution numerical values of the logging gas measurement data, the rock fragments and the azimuth gamma data.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202410326281.3A CN118148602A (en) | 2024-03-21 | 2024-03-21 | Method for improving drilling rate of coal seam for high-dip-angle coal seam horizontal well |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202410326281.3A CN118148602A (en) | 2024-03-21 | 2024-03-21 | Method for improving drilling rate of coal seam for high-dip-angle coal seam horizontal well |
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| CN118148602A true CN118148602A (en) | 2024-06-07 |
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| CN202410326281.3A Pending CN118148602A (en) | 2024-03-21 | 2024-03-21 | Method for improving drilling rate of coal seam for high-dip-angle coal seam horizontal well |
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