CN112267875A - Method for determining optimal coal yield of coal seam hydraulic punching - Google Patents
Method for determining optimal coal yield of coal seam hydraulic punching Download PDFInfo
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- CN112267875A CN112267875A CN202011138469.3A CN202011138469A CN112267875A CN 112267875 A CN112267875 A CN 112267875A CN 202011138469 A CN202011138469 A CN 202011138469A CN 112267875 A CN112267875 A CN 112267875A
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- hydraulic punching
- coal
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B47/00—Survey of boreholes or wells
- E21B47/06—Measuring temperature or pressure
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B7/00—Special methods or apparatus for drilling
- E21B7/18—Drilling by liquid or gas jets, with or without entrained pellets
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21F—SAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, OR DRAINING IN OR OF MINES OR TUNNELS
- E21F7/00—Methods or devices for drawing- off gases with or without subsequent use of the gas for any purpose
Abstract
The invention discloses a method for determining the optimal coal yield of hydraulic punching of a coal seam, which comprises the following specific steps of firstly selecting two hydraulic punching drill holes, constructing a gas pressure monitoring hole at the central position of a connecting line of the two hydraulic punching drill holes, installing a pressure gauge and monitoring the gas pressure, constructing the hydraulic punching drill holes and performing hydraulic punching operation after the reading of the pressure gauge is stable, and designing the coal yield of each meter of drill holes to be m1Repeating the steps to construct a plurality of groups of hydraulic punching holes and respectively designing the coal output per meter of the holes to be m1+0.3、m1+0.6、m1+ 0.9...; finally, all the hydraulic punching drill holes are networked for gas extraction, the gas pressure in the gas pressure monitoring holes is continuously recorded, after a certain period of gas extraction, a relation curve of the gas pressure of the drill holes and the coal output is drawn, and the gas pressure on the curve is the highestThe coal output of the drill hole corresponding to the low point is the optimal coal output of the hydraulic punching drill hole, the method is simple to operate and low in cost, and the application effect of the hydraulic punching technology can be greatly improved.
Description
Technical Field
The invention relates to the field of coal mines, in particular to a method for determining the optimal coal yield of hydraulic punching of a coal seam.
Background
The gas disaster is one of the main disasters of coal mining in China, and the safety production of coal mines is seriously threatened. At present, the most important means for preventing and treating gas disasters is coal seam gas extraction. However, because the coal seam in China generally has the characteristics of microporosity, low permeability and strong adsorption, particularly after the coal seam enters a deep part, the gas extraction of the coal seam is more difficult, and reservoir transformation measures are required to improve the gas permeability of the coal seam.
As a high-efficiency coal seam permeability-increasing measure, the hydraulic punching is widely applied to the low-permeability coal seam strengthening gas extraction engineering practice in China in recent years, and a good application effect is achieved. However, a key problem to be solved in the prior art is the optimal coal yield of punching. If the coal output amount of the drilled holes is less, the equivalent aperture of the drilled holes is smaller, the pressure relief range of the drilled holes is limited, and a better extraction effect is difficult to achieve. On the other hand, if the coal output of the drill hole is too large, on one hand, serious stress concentration can occur between holes, so that gas in the region is difficult to extract, an extraction blind area and a high-outburst danger point occur, and potential safety hazards are buried in later-period coal roadway excavation; on the other hand, too large coal output from the drill hole can lead to serious coal body breakage, which leads to difficult roadway side support in the later coal roadway tunneling process and increases the engineering cost. Therefore, in order to determine a reasonable coal yield of the hydraulic punching holes, a method for determining an optimal coal yield of the hydraulic punching holes of the coal seam is needed to improve the engineering applicability of the hydraulic punching technology and improve the gas treatment effect of the hydraulic punching technology.
Disclosure of Invention
Aiming at the technical defects, the invention aims to provide the method for determining the optimal coal yield of the hydraulic punching of the coal seam, which is simple to operate and low in cost, and can greatly improve the application effect of the hydraulic punching technology and improve the engineering applicability of the hydraulic punching technology.
In order to solve the technical problems, the invention adopts the following technical scheme:
the invention provides a method for determining the optimal coal yield of coal seam hydraulic punching, which specifically comprises the following steps:
s1: selecting the positions of two hydraulic punching drill holes in a high gas coal seam, and determining the distance L between the two hydraulic punching drill holes;
s2: constructing a gas pressure monitoring hole from the bottom suction roadway to the midpoint position of the central connecting line of the two hydraulic punching holes, then sealing the hole, installing a gas pressure gauge and continuously monitoring the gas pressure in the hole;
s3: observing a gas pressure gauge, constructing a hydraulic punching hole at the position set in the step S1 after the gas pressure in the gas pressure monitoring hole is stable, and then performing punching operation, wherein the coal output of each meter of the punching section of the hydraulic punching hole is designed to be m1；
S4: repeating the steps S1-S3, constructing N groups of hydraulic punching holes in total, wherein the distance between every two groups of hydraulic punching holes is d, and the coal output per meter of punching sections of the hydraulic punching holes from the 1 st group to the N th group is respectively designed to be m1、m1+0.3、m1+0.6……；
S5: networking all hydraulic punching drill holes, extracting gas, and recording the pressure change of a gas pressure monitoring hole monitored by a gas pressure gauge;
s6: after certain time of extraction, drawing the final gas pressure of each gas pressure monitoring hole and the coal output corresponding to each group of hydraulic punching holes into a gas pressure-coal output curve, wherein the coal output corresponding to the lowest point of the gas pressure in the curve is the optimal coal output m of the hydraulic punching holes of the coal bed under the condition0。
Preferably, in step S1, L takes a value of 5m to 8 m.
Preferably, in step S2, the gas pressure monitoring hole is located in the same plane as the axis of the hydraulic piercing hole, and the final hole position of the gas pressure monitoring hole is located at the midpoint of the center connecting line of the final holes of the hydraulic piercing hole.
Preferably, in step S3, m1The value is 0.1t/m to 0.3 t/m.
Preferably, in the step S4, N is 5-10, and the distance d between every two groups of hydraulic punching holes is 20-50 m;
preferably, in step S6, the time for extracting the hydraulic punching hole is selected to be 100 d-300 d.
The invention has the beneficial effects that: according to the method, a plurality of groups of hydraulic punching drill holes and gas monitoring drill holes with different coal yields are constructed in the coal seam, the pressure change in the different groups of gas monitoring drill holes after a period of extraction is researched, a relation curve of the gas pressure and the coal yields is drawn, and the optimal coal yield of the hydraulic punching drill holes is finally determined; the method is simple to operate and low in cost, and can greatly improve the application effect of the hydraulic punching technology and improve the engineering applicability of the hydraulic punching technology.
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 is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a front view of positions of a single group of hydraulic punching drill holes and gas pressure monitoring holes in a method for determining an optimal coal output of hydraulic punching of a coal seam according to an embodiment of the present invention;
fig. 2 is a top view of positions of a single group of hydraulic punching drill holes and gas pressure monitoring holes in a method for determining an optimal coal output of hydraulic punching of a coal seam according to an embodiment of the present invention;
fig. 3 is a schematic diagram of a relationship curve between gas pressure and coal output in a method for determining an optimal coal output of a hydraulic punching of a coal seam according to an embodiment of the present invention.
Description of reference numerals:
1-bottom suction lane; 2-high gas coal seam, 3-hydraulic punching and drilling, and 4-gas pressure monitoring hole.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
As shown in fig. 1 to 3, a method for determining an optimal coal yield of a hydraulic punching hole of a coal seam specifically includes the following steps:
s1: selecting the positions of two hydraulic punching drill holes 3 in the high gas coal seam 2, and determining the distance 5m between the two hydraulic punching drill holes 3;
s2: constructing a gas pressure monitoring hole 4 from the bottom suction roadway 1 to the midpoint position of the central connecting line of the two hydraulic punching holes 3, then sealing the hole, installing a gas pressure gauge and continuously monitoring the gas pressure in the hole; the axes of the gas pressure monitoring hole 4 and the hydraulic punching drill hole 3 are positioned in the same plane, and the final hole position of the gas pressure monitoring hole 4 is positioned at the midpoint of the connecting line of the final hole centers of the hydraulic punching drill hole 3;
s3: observing a gas pressure gauge, constructing a hydraulic punching hole 3 at the position set in the step S1 after the gas pressure in the gas pressure monitoring hole 4 is stable, and then performing punching operation, wherein the coal output of each meter of hole at the punching section of the hydraulic punching hole 3 is designed to be 0.1 t/m;
s4: repeating the steps S1-S3, constructing 8 groups of hydraulic punching holes 3, wherein the distance between every two groups of hydraulic punching holes 3 is 50m, and the coal output per meter of the punching sections of the hydraulic punching holes 3 from the 1 st group to the 8 th group is respectively designed to be 0.1t/m, 0.4t/m, 0.7t/m, 1.0t/m, 1.3t/m, 1.6t/m, 1.9t/m and 2.2 t/m;
s5: networking all the hydraulic punching drill holes 3, extracting gas, and recording the pressure change in a gas pressure monitoring hole 4 monitored by a gas pressure gauge;
s6: after 300 days of extraction, drawing the final gas pressure of each gas pressure monitoring hole 4 and the coal output corresponding to each group of hydraulic punching drill holes 3 into a gas pressure-coal output curve, wherein the coal output corresponding to the lowest point of the gas pressure in the curve is the optimal coal output m of the hydraulic punching of the coal bed under the condition0。
Referring to FIG. 3, m0For optimum coal production, p0The original gas pressure of the coal bed is obtained;
it will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.
Claims (6)
1. The method for determining the optimal coal yield of the coal seam hydraulic punching is characterized by comprising the following steps:
s1: selecting the positions of two hydraulic punching drill holes (3) in the high gas coal seam (2), and determining the distance L between the two hydraulic punching drill holes (3);
s2: constructing a gas pressure monitoring hole (4) from the bottom suction roadway (1) to the midpoint position of the central connecting line of the two hydraulic punching holes (3), then sealing the hole, installing a gas pressure gauge and continuously monitoring the gas pressure in the hole;
s3: observing a gas pressure gauge, constructing the hydraulic punching drill hole (3) at the position set in the step S1 after the gas pressure in the gas pressure monitoring hole (4) is stable, and then punching, wherein the coal output of each meter of drill hole at the punching section of the hydraulic punching drill hole (3) is designed to be m1；
S4: repeating the steps S1-S3, constructing N groups of hydraulic punching holes (3), wherein the distance between every two groups of hydraulic punching holes (3) is d, and the coal output per meter of the punching sections of the hydraulic punching holes (3) from the 1 st group to the N th group is respectively designed to be m1、m1+0.3、m1+0.6……；
S5: networking all the hydraulic punching drill holes (3), extracting gas, and recording the pressure change in the gas pressure monitoring holes (4) monitored by a gas pressure gauge;
s6: after certain time of extraction, drawing the final gas pressure of each gas pressure monitoring hole (4) and the coal output corresponding to each group of hydraulic punching holes (3) into a gas pressure-coal output curve, wherein the coal output corresponding to the lowest point of the gas pressure in the curve is the optimal coal output m of the hydraulic punching of the coal bed under the condition0。
2. The method for determining the optimal coal yield of the coal seam hydraulic punching hole as claimed in claim 1, wherein in the step S1, the value of L is 5 m-8 m.
3. The method for determining the optimal coal yield of the hydraulic punching of the coal seam as claimed in claim 1, wherein in step S2, the axes of the gas pressure monitoring hole (4) and the hydraulic punching drill hole (3) are located in the same plane, and the final hole position of the gas pressure monitoring hole (4) is located at the midpoint of the connecting line of the final hole centers of the hydraulic punching drill holes (3).
4. The method for determining the optimal coal yield of the hydraulic punching of the coal seam as claimed in claim 1, wherein in step S3, m1The value is 0.1t/m to 0.3 t/m.
5. The method for determining the optimal coal yield of the hydraulic punching of the coal seam according to claim 1, wherein in the step S4, N is 5-10, and the distance d between every two groups of hydraulic punching drill holes (3) is 20-50 m.
6. The method for determining the optimal coal yield of the coal seam hydraulic punching hole according to claim 1, wherein in the step S6, the time for extracting the hydraulic punching hole (3) is selected to be 100-300 d.
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4452489A (en) * | 1982-09-20 | 1984-06-05 | Methane Drainage Ventures | Multiple level methane drainage shaft method |
| CN101824982A (en) * | 2010-04-19 | 2010-09-08 | 中国矿业大学 | Coal bed gas drainage effective radius measuring method |
| CN104131832A (en) * | 2014-07-14 | 2014-11-05 | 中国矿业大学 | High-gas-content coal seam punching cutting pressing and sucking integral pressure relief and antireflection gas extraction method |
| CN109490510A (en) * | 2018-11-01 | 2019-03-19 | 河南理工大学 | Method based on the layer-through drilling Gas characteristic measurement hydraulic flushing in hole radius of influence |
| US20200200004A1 (en) * | 2017-10-12 | 2020-06-25 | China University Of Mining And Technology | Measurement-while-drilling method and device for assessing outburst risk of coal seam |
| US20200318476A1 (en) * | 2018-04-28 | 2020-10-08 | China University Of Mining And Technology | Simulation test system for gas extraction from tectonically-deformed coal seam in-situ by depressurizing horizontal well cavity |
-
2020
- 2020-10-22 CN CN202011138469.3A patent/CN112267875B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4452489A (en) * | 1982-09-20 | 1984-06-05 | Methane Drainage Ventures | Multiple level methane drainage shaft method |
| CN101824982A (en) * | 2010-04-19 | 2010-09-08 | 中国矿业大学 | Coal bed gas drainage effective radius measuring method |
| CN104131832A (en) * | 2014-07-14 | 2014-11-05 | 中国矿业大学 | High-gas-content coal seam punching cutting pressing and sucking integral pressure relief and antireflection gas extraction method |
| US20200200004A1 (en) * | 2017-10-12 | 2020-06-25 | China University Of Mining And Technology | Measurement-while-drilling method and device for assessing outburst risk of coal seam |
| US20200318476A1 (en) * | 2018-04-28 | 2020-10-08 | China University Of Mining And Technology | Simulation test system for gas extraction from tectonically-deformed coal seam in-situ by depressurizing horizontal well cavity |
| CN109490510A (en) * | 2018-11-01 | 2019-03-19 | 河南理工大学 | Method based on the layer-through drilling Gas characteristic measurement hydraulic flushing in hole radius of influence |
Non-Patent Citations (6)
| Title |
|---|
| DING HOUCHENG，ETC: "Optimized Parameters and Forecast Analysis of High-position Hole for Goaf Gas Drainage", 《PROCEDIA ENGINEERING》 * |
| MICHAEL A. TREVITS,ETC: "Optimized Parameters and Forecast Analysis of High-position Hole for Goaf Gas Drainage", 《1980 SPE/DOE SYMPOSIUM ON UNCONVENTIONAL GAS RECOVERY》 * |
| TING LIU,ETC: "Modeling air leakage around gas extraction boreholes in mining-disturbed coal seams", 《PROCESS SAFETY AND ENVIRONMENTAL PROTECTION》 * |
| YABIN GAO，ETC: "Drilling large diameter cross-measure boreholes to improve gas drainage in highly gassy soft coal seams", 《JOURNAL OF NATURAL GAS SCIENCE AND ENGINEERING》 * |
| 叶青等: "工作面卸压区浅孔瓦斯抽放机理及其影响因素分析", 《煤层气勘探开发理论与实践会议论文集》 * |
| 魏建平等: "水力冲孔有效影响半径数值模拟", 《煤矿安全》 * |
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