CN110566155A - circulating grouting and hole sealing method for deformation-resistant gas extraction drill hole in mining area - Google Patents
circulating grouting and hole sealing method for deformation-resistant gas extraction drill hole in mining area Download PDFInfo
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- CN110566155A CN110566155A CN201911034220.5A CN201911034220A CN110566155A CN 110566155 A CN110566155 A CN 110566155A CN 201911034220 A CN201911034220 A CN 201911034220A CN 110566155 A CN110566155 A CN 110566155A
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- drill hole
- grouting
- hole
- diameter
- extraction
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Classifications
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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
- E21B33/00—Sealing or packing boreholes or wells
- E21B33/10—Sealing or packing boreholes or wells in the borehole
- E21B33/13—Methods or devices for cementing, for plugging holes, crevices, or the like
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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
a method for circularly grouting and sealing a borehole for deformation-resistant gas extraction in a mining area is suitable for being used underground in a coal mine. Constructing an upward large-diameter borehole from the roadway to the coal seam affected by mining; constructing small-diameter drill holes along the axial direction of the large-diameter drill holes towards the coal seam; then, placing a steel sleeve in the large-diameter drill hole, and plugging the large-diameter drill hole by using a plug; and finally, injecting hole sealing slurry into the drill hole through the grouting extraction pipe, and sealing and reinforcing the drill hole to realize triple protection and sealing of the drill hole in the mining area. And after networking extraction is carried out for a period of time, when the concentration of the gas in the drill hole is reduced to a specified value, grouting into the hole through the grouting extraction pipe again, and blocking secondary cracks. And performing circular grouting in such a way until the extraction is finished. The method has the advantages of simple operation, low cost, high safety, good effect and wide application range.
Description
Technical Field
The invention relates to a hole sealing method for a gas extraction drill hole in a mining area, in particular to a circulating grouting hole sealing method for an anti-deformation gas extraction drill hole in the mining area used underground a coal mine.
background
with the gradual exhaustion of shallow coal resources, the futurecoal resource mining will become normal. After entering the deep part, the coal bed has high gas content and high pressure, and seriously threatens the safe production of a mine. In addition, the coal bed gas is also a clean and efficient energy source and a strong greenhouse gas. According to statistics, the amount of coal bed gas resources buried deep in 2000m or less in China is about 36.81 trillion m3And the third place in the world. The coal bed gas resource with the burial depth of 1000-2000 m accounts for 61.2% of the total amount of the coal bed gas resources in China, and the method has extremely high mining value. Therefore, the realization of the efficient development of the coal bed gas has important significance for guaranteeing the mining safety, realizing the resource utilization and protecting the environment.
After the coal seam roadway is excavated, the stress balance state of the coal body influenced by excavation is broken, and further the coal body around the roadway is broken under the action of stress to form a fracture zone. After traditional drilling construction is finished, due to the fact that drilling deformation is caused by the influence of mining stress, deformation of a gas extraction pipe, extraction concentration and efficiency are further reduced, and the traditional grouting and hole sealing mode adopts one-time grouting, so that the hole sealing effect is poor. Therefore, in order to improve the gas extraction effect and the extraction concentration of the coal seam drilled hole in the mining area, a brand-new drilling and hole sealing method aiming at the gas extraction of the mining area needs to be found urgently so as to meet the requirements of drilling and hole sealing of the coal seam underground.
Disclosure of Invention
Aiming at the defects of the prior art, the method for circularly grouting and sealing the extraction region deformation-resistant gas extraction drill hole is provided, wherein the drill hole is not easy to deform, the sealing effect is good, the operation is simple, the cost is low, and the safety is high.
In order to achieve the technical purpose, the invention discloses a circulating grouting and hole sealing method for an anti-deformation gas extraction drill hole in a mining area, which is characterized by comprising the following steps of:
s1: firstly, constructing an upward large-diameter borehole from a roadway to a coal seam affected by mining, wherein the upward angle range is 10-90 degrees, and the construction depth is equal to or slightly deeper than a rock stratum;
s2: then, constructing small-diameter drill holes along the axis of the large-diameter drill holes towards the direction of the coal seam;
S3: arranging a steel sleeve in the large-diameter drill hole, wherein the diameter of the steel sleeve is between two thirds and three fourths of the large-diameter drill hole, and the length of the steel sleeve is slightly smaller than that of the large-diameter drill hole;
S4: a plug is arranged at the orifice of the large-diameter drill hole, and then a grouting extraction pipe and an overflow pipe respectively penetrate through the center of the plug, wherein the front end of the grouting extraction pipe is a floral pipe and extends into the small-diameter drill hole to be close to the bottom of the drill hole, and the length of the overflow pipe exceeds that of the large-diameter drill hole;
S5: injecting hole sealing slurry into the drill hole through the grouting extraction pipe, wherein the slurry gradually flows into the steel casing under the action of gravity, flows into a gap between the large-diameter drill hole and the steel casing through a gap after the steel casing is filled, and air in the drill hole is extruded into a coal seam in the grouting process to play a role in displacing and replacing gas, so that the drill hole is further reinforced and mining cracks around the drill hole are sealed;
S6: after the overflow pipe continuously flows out of the slurry, the slurry reaches the orifice position of the overflow pipe, grouting is stopped at the moment, and after the slurry is solidified, a grouting extraction pipe is connected into a gas extraction system for gas extraction operation;
S7: after the gas is extracted for a certain time, because of the influence of mining disturbance, a large amount of secondary fractures are generated in the coal seam around the drill hole, the concentration of extracted gas is reduced, when the concentration of the gas in the drill hole is reduced to a specified value, grouting is performed in the drill hole through the grouting extraction pipe again, and the secondary fractures are blocked; and repeating the steps S5-S6, and performing circulating grouting and hole sealing on all the drill holes on the working face.
furthermore, the diameter of the large-diameter drill hole is 150-200 mm, the length of the large-diameter drill hole is 10-15 m, and the length of the small-diameter drill hole is 30-50 m.
Furthermore, the diameter of the steel casing is 100-150 mm, and the steel casing is used for preventing deformation of the gas extraction drill hole and blocking a mining fracture.
Furthermore, the steel cylindrical support is welded on the outer wall of the steel casing and used for fixing the steel casing in the large-diameter drill hole, ensuring the distance between the steel casing and the large-diameter drill hole and resisting deformation possibly generated by the large-diameter drill hole.
Furthermore, the material of end cap be the rubber material, can effectively block the thick liquid and prevent drilling drill way orifice weeping and air leakage.
Further, the gas concentration of the drill hole is reduced to a specified value, wherein the gas concentration is lower than 10% -20%.
has the advantages that: according to the invention, a large-diameter drill hole is drilled upwards in a coal seam construction, then a small-diameter drill hole is constructed along the axial direction of the large-diameter drill hole to the coal seam direction, a steel sleeve is placed in the large-diameter drill hole, the steel sleeve and a steel cylindrical support welded on the outer wall of the sleeve are used for reinforcing the drill hole, and the large-diameter drill hole is blocked by a plug; hole sealing slurry is injected into the drill hole to seal and reinforce the drill hole, so that the deformation of the drill hole is prevented, triple protection and sealing of the upward drill hole in the mining area are realized, and the deformation resistance and firmness of the drill hole are effectively ensured; and after networking extraction is carried out for a period of time, when the concentration of the gas in the drill hole is reduced to a specified value, grouting into the hole through the grouting extraction pipe again, and blocking secondary cracks. And performing circular grouting in such a way until the extraction is finished. The method has the advantages of simple operation, low cost, high safety, good effect and wide application range.
drawings
Fig. 1 is a circular grouting hole sealing method for deformation-resistant gas extraction drill holes in a mining area in embodiment 1 of the invention;
in fig. 1: 1-grouting extraction pipe, 2-overflow pipe, 3-perforated pipe, 4-plug, 5-large diameter borehole, 6-small diameter borehole, 7-steel casing, 8-rock stratum, 9-crack and 10-coal bed.
The specific implementation mode is as follows:
the invention is further described below with reference to the accompanying drawings.
as shown in fig. 1, the method for circularly grouting and sealing the mining area anti-deformation gas extraction drill hole comprises the following steps:
s1: firstly, constructing a large-diameter drill hole 5 upwards from a roadway to a coal seam affected by mining, wherein the ascending angle range is 10-90 degrees, the construction depth is equal to or slightly deeper than a rock stratum 8, the diameter of the large-diameter drill hole 5 is 150-200 mm, the length of the large-diameter drill hole is 10-15 m, and the length of a drill hole of a small-diameter drill hole 6 is 30-50 m;
s2: then, constructing a small-diameter drill hole 6 along the axis of the large-diameter drill hole 5 towards the direction of the coal seam;
S3: a steel sleeve 7 is arranged in the large-diameter drill hole 5, the diameter of the steel sleeve 7 is between two thirds and three fourths of the large-diameter drill hole 5, and the length of the steel sleeve 7 is slightly smaller than the length of the large-diameter drill hole 5; the diameter of the steel casing 7 is 100-150 mm, the steel casing 7 is used for preventing deformation of the gas extraction drill hole and plugging a mining fracture, a steel cylindrical support is welded on the outer wall of the steel casing 7 and used for fixing the steel casing 7 in the large-diameter drill hole 1, the distance between the steel casing 7 and the large-diameter drill hole 1 is ensured, and deformation which may be generated by the large-diameter drill hole 1 is resisted at the same time;
S4: an orifice of a large-diameter drill hole 5 is provided with a plug 4, the plug 4 is made of rubber, slurry can be effectively blocked to prevent leakage and air leakage at the orifice of the drill hole, and then the plug 4 penetrates through a grouting extraction pipe 1 and an overflow pipe 2 respectively at the center of the plug 4, wherein the front end of the grouting extraction pipe 1 is a perforated pipe 3 and extends into a small-diameter drill hole 6 to be close to the bottom of the hole, and the length of the overflow pipe 2 exceeds that of the large-diameter drill hole 5;
S5: injecting hole sealing slurry into the drill hole through the grouting extraction pipe 1, wherein the slurry gradually flows into the steel casing 7 under the action of gravity, flows into a gap between the large-diameter drill hole 5 and the steel casing 7 through a gap after the steel casing 7 is filled, and air in the drill hole is extruded into a coal seam to play a role in displacing and replacing gas in the grouting process, so that the drill hole is further reinforced and mining cracks around the drill hole are blocked;
S6: after the overflow pipe 2 continuously flows out of the slurry, the slurry reaches the position of the orifice of the overflow pipe 2, stopping grouting at the moment, and after the slurry is solidified, connecting the grouting extraction pipe 1 into a gas extraction system to perform gas extraction operation;
s7: after the gas is extracted for a certain time, because of the influence of mining disturbance, a large amount of secondary fractures are generated in the coal seam around the drill hole, the concentration of extracted gas is reduced, when the concentration of the gas in the drill hole is reduced to be lower than 10% -20%, grouting is performed in the hole through the grouting extraction pipe again, and the secondary fractures are blocked; and repeating the steps S5-S6, and performing circulating grouting and hole sealing on all the drill holes on the working face.
Claims (6)
1. A method for circularly grouting and sealing a mining area anti-deformation gas extraction drill hole is characterized by comprising the following steps:
s1: firstly, constructing an upward large-diameter borehole (5) from a roadway to a coal seam affected by mining, wherein the upward angle range is 10-90 degrees, and the construction depth is equal to or slightly deeper than a rock stratum (8);
S2: then, constructing a small-diameter drill hole (6) along the axis of the large-diameter drill hole (5) towards the direction of the coal seam;
S3: a steel sleeve (7) is arranged in the large-diameter drill hole (5), the diameter of the steel sleeve (7) is between two thirds and three fourths of the large-diameter drill hole (5), and the length of the steel sleeve is slightly smaller than the length (5) of the large-diameter drill hole;
s4: a plug (4) is arranged at the orifice of the large-diameter drill hole (5), and then the center of the plug (4) respectively penetrates through a grouting extraction pipe (1) and an overflow pipe (2), wherein the front end of the grouting extraction pipe (1) is a perforated pipe (3), the grouting extraction pipe extends into the small-diameter drill hole (6) to be close to the bottom of the hole, and the length of the overflow pipe (2) exceeds that of the large-diameter drill hole (5);
S5: injecting hole sealing slurry into the drill hole through the grouting extraction pipe (1), wherein the slurry gradually flows into the steel casing (7) under the action of gravity, flows into a gap between the large-diameter drill hole (5) and the steel casing (7) through a gap after the steel casing (7) is filled, and air in the drill hole is extruded into a coal seam in the grouting process to play a role in displacing and replacing gas, so that the drill hole is further reinforced and mining cracks around the drill hole are sealed;
S6: after the overflow pipe (2) continuously flows out of the slurry, the slurry reaches the position of the orifice of the overflow pipe (2), grouting is stopped at the moment, and after the slurry is solidified, the grouting extraction pipe (1) is connected into a gas extraction system for gas extraction;
s7: after the gas is extracted for a certain time, because of the influence of mining disturbance, a large amount of secondary fractures are generated in the coal seam around the drill hole, the concentration of extracted gas is reduced, when the concentration of the gas in the drill hole is reduced to a specified value, grouting is performed in the drill hole through the grouting extraction pipe again, and the secondary fractures are blocked; and repeating the steps S5-S6, and performing circulating grouting and hole sealing on all the drill holes on the working face.
2. the mining area deformation-resistant gas extraction borehole circulating grouting hole sealing method according to claim 1, characterized in that: the diameter of the large-diameter drill hole (5) is 150-200 mm, the length of the large-diameter drill hole is 10-15 m, and the length of the small-diameter drill hole (6) is 30-50 m.
3. the mining area deformation-resistant gas extraction borehole circulating grouting hole sealing method according to claim 1, characterized in that: the diameter of the steel casing (7) is 100-150 mm, and the steel casing is used for preventing deformation of the gas extraction drill hole and blocking a mining-induced fracture.
4. The mining area deformation-resistant gas extraction borehole circulating grouting hole sealing method according to claim 1, characterized in that: the steel cylindrical support is welded on the outer wall of the steel sleeve (7) and used for fixing the steel sleeve (7) in the large-diameter drill hole (1), ensuring the distance between the steel sleeve and the large-diameter drill hole and resisting deformation possibly generated by the large-diameter drill hole (1).
5. The mining area deformation-resistant gas extraction borehole circulating grouting hole sealing method according to claim 1, characterized in that: the plug (4) is made of rubber, so that slurry can be effectively blocked to prevent leakage and air leakage of a drilling orifice.
6. The mining area deformation-resistant gas extraction borehole circulating grouting hole sealing method according to claim 1, characterized in that: the gas concentration of the drill hole is reduced to a specified value, wherein the gas concentration is lower than 10-20%.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201911034220.5A CN110566155B (en) | 2019-10-29 | 2019-10-29 | Circulating grouting and hole sealing method for deformation-resistant gas extraction drill hole in mining area |
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| CN201911034220.5A CN110566155B (en) | 2019-10-29 | 2019-10-29 | Circulating grouting and hole sealing method for deformation-resistant gas extraction drill hole in mining area |
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| CN110566155B CN110566155B (en) | 2020-05-19 |
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Cited By (2)
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| CN111155960A (en) * | 2020-01-08 | 2020-05-15 | 太原理工大学 | Coal seam gas extraction drilling and hole sealing method based on MICP technology |
| CN111927388A (en) * | 2020-08-17 | 2020-11-13 | 河南理工大学 | A slip casting shutoff crack device for overlying strata abscission layer |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111155960A (en) * | 2020-01-08 | 2020-05-15 | 太原理工大学 | Coal seam gas extraction drilling and hole sealing method based on MICP technology |
| CN111927388A (en) * | 2020-08-17 | 2020-11-13 | 河南理工大学 | A slip casting shutoff crack device for overlying strata abscission layer |
| CN111927388B (en) * | 2020-08-17 | 2022-08-02 | 河南理工大学 | A slip casting shutoff crack device for overlying strata abscission layer |
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| CN110566155B (en) | 2020-05-19 |
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