LU102183B1 - High-air-impermeability hole sealing method for short-range relieved coal seam crossing gas drainage borehole - Google Patents
High-air-impermeability hole sealing method for short-range relieved coal seam crossing gas drainage borehole Download PDFInfo
- Publication number
- LU102183B1 LU102183B1 LU102183A LU102183A LU102183B1 LU 102183 B1 LU102183 B1 LU 102183B1 LU 102183 A LU102183 A LU 102183A LU 102183 A LU102183 A LU 102183A LU 102183 B1 LU102183 B1 LU 102183B1
- Authority
- LU
- Luxembourg
- Prior art keywords
- borehole
- drainage
- coal seam
- boreholes
- compacting
- Prior art date
Links
- 239000003245 coal Substances 0.000 title claims abstract description 69
- 238000007789 sealing Methods 0.000 title claims abstract description 21
- 238000000034 method Methods 0.000 title claims abstract description 19
- 239000011440 grout Substances 0.000 claims abstract description 32
- 239000004568 cement Substances 0.000 claims abstract description 19
- 239000011435 rock Substances 0.000 claims abstract description 17
- 238000010276 construction Methods 0.000 claims abstract description 10
- 238000007711 solidification Methods 0.000 claims description 2
- 230000008023 solidification Effects 0.000 claims description 2
- 230000000694 effects Effects 0.000 abstract description 7
- 238000005065 mining Methods 0.000 description 11
- 230000001681 protective effect Effects 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 2
- 230000007547 defect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 238000001881 scanning electron acoustic microscopy Methods 0.000 description 1
Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK 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
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK 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
- E21B33/138—Plastering the borehole wall; Injecting into the formation
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK 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
Landscapes
- Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Life Sciences & Earth Sciences (AREA)
- Geology (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- Consolidation Of Soil By Introduction Of Solidifying Substances Into Soil (AREA)
- Drilling And Exploitation, And Mining Machines And Methods (AREA)
Abstract
The present invention discloses a high-air-impermeability hole sealing method for a short-range relieved coal seam crossing gas drainage borehole. Firstly, thicknesses of coal seams of a short-range coal seam group and thicknesses of rock stratums between the coal seams are learnt according to geological information. When an upper coal seam of two short-range coal seams is mined, a lower coal seam needs to be subjected to pressure relief, and during pressure relief, down gas drainage boreholes are constructed in gob-side entries of the upper coal seam. Before the construction of a drainage borehole, compacting boreholes are firstly applied around an expected position of the drainage borehole. Cement grout is injected into the compacting boreholes to compact breakable rock stratums. Then, a solidified cement grout wall is used as an outer wall of the drainage borehole. In the present invention, the breakable rock masses are compacted by means of the compacting boreholes. In combination with the drainage borehole with the solidified cement grout wall, the sealing property is greatly improved in the gas drainage process, and the drainage efficiency is improved. The sealing property during gas drainage is higher, and the drainage effect is better.
Description
P100583LU0G" | 02183 HIGH-AIR-IMPERMEABILITY HOLE SEALING METHOD FOR SHORT-RANGE
BACKGROUND Technical Field The present invention relates to the field of mine gas drainage, and mainly relates to a high-air-impermeability hole sealing method for a short-range relieved coal seam crossing gas drainage borehole. Related Art Mine gas is one of the important factors affecting the production and safety of coal mines. A comprehensive gas treatment theory and application technology represented by protective seam mining is researched and explored to effectively control coal and gas outburst and gushing of a large amount of gas to a mining roadway and realize coal and gas co-mining, which is of great significance to the safe and efficient production of mines and sustainable development. Experts and scholars around the world believe that where conditions permit, protective seam mining is one of the most economical and effective measures to prevent the coal and gas outburst. By mining a protective seam, the air permeability of a coal and rock mass is enhanced, so that relieved drainage of coal seam gas can be realized, and finally, the coal and gas outburst problem can be solved. Nowadays, if coal seam occurrence conditions permit, various countries in the world use the protective seam mining as a preferred method when mining coal seams with outbursts or dangerous rock bursts. However, when gas is drained from protected coal seams at a short range, due to the influence of upper coal seam mining, rock stratums between the coal seams are broken. Therefore, how to ensure that the relieved gas drainage effect of the protected seams is enhanced during the drainage of gas between the broken rock stratums becomes an urgent problem to be solved.
SUMMARY An objective of the present invention is to overcome the defects of the prior art and provide a high-air-impermeability hole sealing method for a short-range relieved coal seam crossing gas drainage borehole, thereby solving the problem of severe reduction of the drainage efficiency caused by poor sealing property of crossing gas drainage borehole in a
| drainage process due to the fact that a rock mass between two coal seams is broken by the“ 02183 influence of upper coal seam mining.
The present invention is realized by the following technical solution: A high-air-impermeability hole sealing method for a short-range relieved coal seam crossing gas drainage borehole is characterized in that: Firstly, thicknesses of coal seams of a short-range coal seam group and thicknesses of rock stratums between the coal seams are learnt according to geological information. When an upper coal seam of two short-range coal seams is mined, a lower coal seam needs to be subjected to pressure relief, and during pressure relief, down gas drainage boreholes are constructed in gob-side entries of the upper coal seam. Before the construction of a drainage borehole, compacting boreholes are firstly applied around an expected position of the drainage borehole. Cement grout is injected into the compacting boreholes to compact breakable rock stratums. Then, a solidified cement grout wall is used as an outer wall of the drainage borehole. A specific construction method includes the following steps: firstly, constructing a plurality of compacting boreholes at the periphery of the expected position of the drainage borehole, wherein the compacting boreholes are constructed to the upper surface of the lower coal seam; then, injecting the cement grout into the compacting boreholes; after the grout in the compacting boreholes is solidified, constructing a large borehole with a relatively large diameter at the expected position of the drainage borehole, and injecting the grout into the large borehole, wherein the large borehole is also constructed to the upper surface of the lower coal seam; and after the grout in the large borehole is solidified, constructing, in the large borehole, the drainage borehole extending into the lower coal seam, wherein the hole wall of the drainage borehole is the solidified cement grout wall, thus obtaining the gas drainage hole with extremely good sealing property.
Four compacting boreholes are constructed at positions about 250 mm around the position of the drainage borehole, and the diameter of the compacting boreholes is 100 mm.
The diameter of the large borehole is 300 mm.
The diameter of the drainage borehole in the large borehole is 100 mm.
The solidification time of the cement grout injected into the compacting boreholes and the large borehole is about one hour.
According to the high-air-impermeability hole sealing method suitable for the short-range relieved coal seam crossing gas drainage borehole of the present invention, the compacting boreholes are firstly constructed around the expected position of the drainage 102183 borehole in the gob-side entry of the upper coal seam, and the grout is injected into each borehole. This is to compact the breakable rock masses and prevent a hole collapse phenomenon occurring in a drainage borehole construction process. After the grout in the four compacting boreholes is solidified, the large borehole is constructed at the position of the drainage hole firstly, and then the grout is injected, as long as the depth of the large borehole reaches the lower coal seam. After the grout is solidified, a small borehole, i.e., the drainage borehole, is constructed in the large borehole. The depth of the drainage borehole needs to meet that the drainage borehole is bored into the lower coal seam. At this time, the hole wall of the drainage borehole is the solidified cement grout wall, so that gas drainage with high air impermeability can be realized during gas drainage, and a better gas drainage effect is achieved.
The present invention has the following advantages: The method of the present invention is simple and reasonable. The breakable rock masses are compacted by means of the compacting boreholes. In combination with the drainage borehole with the solidified cement grout wall, the sealing property is greatly improved in the gas drainage process, and the drainage efficiency is improved. Therefore, the technical problem of poor gas drainage effect in broken rock masses can be solved, the sealing property during gas drainage is higher, the drainage effect is better, and the effect is outstanding and easy to achieve.
BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a transverse sectional view of a construction structure of the present invention. Fig. 2 is a top view of the construction structure of the present invention. Reference numerals in the drawings refer to: 1 denotes a compacting borehole; 2 denotes a large borehole; 3 denotes a drainage borehole; 4 denotes a gob-side entry; 5 denotes an upper coal seam; 6 denotes a lower coal seam; and 7 denotes a mining region.
DETAILED DESCRIPTION Reference is made to the drawings.
A high-air-impermeability hole sealing method for a short-range relieved coal seam crossing gas drainage borehole is characterized in that: firstly, thicknesses of coal seams of a short-range coal seam group and thicknesses of rock stratums between the coal seams are
| 4 learnt according to geological information.
When an upper coal seam 5 of two short-range 7102183 coal seams is mined, a lower coal seam 6 needs to be subjected to pressure relief, and during pressure relief, down gas drainage boreholes are constructed in gob-side entries 4 on two sides of a mining region 7 of the upper coal seam 5. Before the construction of a drainage borehole 3, compacting boreholes 1 are firstly applied around an expected position of the drainage borehole 3. Cement grout is injected into the compacting boreholes 1 to compact breakable rock stratums.
Then, a solidified cement grout wall is used as an outer wall of the drainage borehole.
A specific construction method includes the following steps: firstly, four compacting boreholes 1 with the diameters of 100 mm are constructed at positions about 250 mm around the expected position of the drainage borehole 3. The compacting boreholes 1 are constructed to the upper surface of the lower coal seam 6. Then, the cement grout is injected into the compacting boreholes 1. After the grout in the compacting boreholes is solidified, a large borehole 2 with a relatively large diameter is constructed at the expected position of the drainage borehole 3, and the grout is injected into the large borehole.
The large borehole 2 is also constructed to the upper surface of the lower coal seam 6. After the grout in the large borehole 2 is solidified, the drainage borehole 3 extending into the lower coal seam 6 is constructed in the large borehole 2. The hole wall of the drainage borehole 3 is the solidified cement grout wall.
Therefore, the drainage borehole 3 can realize high-air-impermeability borehole sealing, and the drainage efficiency is higher, thus ensuring the gas drainage effect and eliminating the threat of gas outbursts and gas accidents.
Claims (5)
1. A high-air-impermeability hole sealing method for a short-range relieved coal seam crossing gas drainage borehole, wherein: 5 firstly, thicknesses of coal seams of a short-range coal seam group and thicknesses of rock stratums between the coal seams are learnt according to geological information; when an upper coal seam of two short-range coal seams is mined, a lower coal seam needs to be subjected to pressure relief, and during pressure relief, down gas drainage boreholes are constructed in gob-side entries of the upper coal seam; before the construction of a drainage borehole, compacting boreholes are firstly applied around an expected position of the drainage borehole; cement grout is injected into the compacting boreholes to compact breakable rock stratums; then, a solidified cement grout wall is used as an outer wall of the drainage borehole; a specific construction method comprises the following steps: firstly, constructing a plurality of compacting boreholes at the periphery of the expected position of the drainage borehole, wherein the compacting boreholes are constructed to the upper surface of the lower coal seam; then, injecting the cement grout into the compacting boreholes; after the grout in the compacting boreholes is solidified, constructing a large borehole with a relatively large diameter at the expected position of the drainage borehole, and injecting the grout into the large borehole, wherein the large borehole is also constructed to the upper surface of the lower coal seam; and after the grout in the large borehole is solidified, constructing, in the large borehole, the drainage borehole extending into the lower coal seam, wherein the hole wall of the drainage borehole is the solidified cement grout wall, thus obtaining the gas drainage hole with extremely good sealing property.
2. The high-air-impermeability hole sealing method for a short-range relieved coal seam crossing gas drainage borehole according to claim 1, wherein four compacting boreholes are constructed at positions about 250 mm around the position of the drainage borehole, and the diameter of the compacting boreholes is 100 mm.
3. The high-air-impermeability hole sealing method for a short-range relieved coal seam crossing gas drainage borehole according to claim 1, wherein the diameter of the large borehole is 300 mm.
4. The high-air-impermeability hole sealing method for a short-range relieved coal seam crossing gas drainage borehole according to claim 3, wherein the diameter of the drainage borehole in the large borehole is 100 mm. Lu102183
5. The high-air-impermeability hole sealing method for a short-range relieved coal seam crossing gas drainage borehole according to claim 1, wherein the solidification time of the cement grout injected into the compacting boreholes and the large borehole is about one hour.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911280820.XA CN110952951A (en) | 2019-12-13 | 2019-12-13 | High-air-tightness hole sealing method for short-distance pressure-relief coal seam crossing gas extraction drill hole |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| LU102183B1 true LU102183B1 (en) | 2021-05-12 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| LU102183A LU102183B1 (en) | 2019-12-13 | 2020-11-06 | High-air-impermeability hole sealing method for short-range relieved coal seam crossing gas drainage borehole |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN110952951A (en) |
| LU (1) | LU102183B1 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115075867B (en) * | 2022-07-04 | 2023-03-21 | 北京科技大学 | Method for accurately relieving pressure and strengthening gas extraction in low-permeability outburst dangerous coal seam area |
Family Cites Families (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4687060A (en) * | 1986-06-13 | 1987-08-18 | Methane Drainage Ventures | Production and grout liner for methane drainage in subterranean boreholes and method |
| RU2065973C1 (en) * | 1994-07-27 | 1996-08-27 | Государственный научно-исследовательский, проектно-конструкторский и проектный угольный институт с экспериментальным заводом | Method for degassing accompanying seams |
| CN101275469B (en) * | 2008-05-12 | 2011-07-13 | 淮南矿业(集团)有限责任公司 | Yolk coal rock formation downward hole pumping and mining pressure relief mash gas construction method |
| CN101603414B (en) * | 2009-07-24 | 2012-11-14 | 吉林省岩科新技术研究开发有限责任公司 | Method for reinforcing wall of drill hole by jet grouting |
| CN102409997A (en) * | 2011-12-09 | 2012-04-11 | 中国矿业大学 | Curtain grouting anti-burst method for cutting through coal and gas bursting seam in shaft |
| CN102628345B (en) * | 2012-04-23 | 2014-07-16 | 山西潞安环保能源开发股份有限公司 | Sealing method of high sealing quasi-horizontal drilling hole |
| CN102900460B (en) * | 2012-11-06 | 2014-10-29 | 中国矿业大学 | Method for performing through-going seam cutting, pressure relief, permeability enhancement and quick tunneling on soft and high-outburst coal seam |
| CN102937011B (en) * | 2012-12-03 | 2015-10-21 | 中国矿业大学 | Mash gas pumping drilling group regional crack field secondary grouting plugging device and method |
| CN106089292A (en) * | 2016-07-05 | 2016-11-09 | 安徽理工大学 | A kind of high gas layer major diameter control hole leads control hydraulic fracturing anti-reflection outburst elimination method |
| CN109854297B (en) * | 2019-02-22 | 2021-01-29 | 中煤科工集团西安研究院有限公司 | Small coal kiln goaf grouting method based on directional drilling process |
-
2019
- 2019-12-13 CN CN201911280820.XA patent/CN110952951A/en active Pending
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2020
- 2020-11-06 LU LU102183A patent/LU102183B1/en active IP Right Grant
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| Publication number | Publication date |
|---|---|
| CN110952951A (en) | 2020-04-03 |
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| Date | Code | Title | Description |
|---|---|---|---|
| FG | Patent granted |
Effective date: 20210512 |