CN110984906A - Long-distance pressure measuring hole with-pressure grouting hole sealing method - Google Patents
Long-distance pressure measuring hole with-pressure grouting hole sealing method Download PDFInfo
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- CN110984906A CN110984906A CN201911108342.4A CN201911108342A CN110984906A CN 110984906 A CN110984906 A CN 110984906A CN 201911108342 A CN201911108342 A CN 201911108342A CN 110984906 A CN110984906 A CN 110984906A
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- 238000007789 sealing Methods 0.000 title claims abstract description 31
- 238000000034 method Methods 0.000 title claims abstract description 26
- 239000004568 cement Substances 0.000 claims abstract description 26
- 239000002002 slurry Substances 0.000 claims abstract description 23
- 239000000463 material Substances 0.000 claims abstract description 20
- 239000003245 coal Substances 0.000 claims abstract description 17
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 16
- 229910052742 iron Inorganic materials 0.000 claims abstract description 8
- 244000025254 Cannabis sativa Species 0.000 claims abstract description 6
- 235000012766 Cannabis sativa ssp. sativa var. sativa Nutrition 0.000 claims abstract description 6
- 235000012765 Cannabis sativa ssp. sativa var. spontanea Nutrition 0.000 claims abstract description 6
- 229920000742 Cotton Polymers 0.000 claims abstract description 6
- 235000009120 camo Nutrition 0.000 claims abstract description 6
- 235000005607 chanvre indien Nutrition 0.000 claims abstract description 6
- 239000011487 hemp Substances 0.000 claims abstract description 6
- 239000004744 fabric Substances 0.000 claims abstract description 5
- 238000002347 injection Methods 0.000 claims description 6
- 239000007924 injection Substances 0.000 claims description 6
- 239000011148 porous material Substances 0.000 claims description 6
- 229910001335 Galvanized steel Inorganic materials 0.000 claims description 5
- 239000008397 galvanized steel Substances 0.000 claims description 5
- 230000000903 blocking effect Effects 0.000 claims description 3
- 239000002893 slag Substances 0.000 claims 1
- 238000012360 testing method Methods 0.000 abstract description 5
- 239000003034 coal gas Substances 0.000 abstract description 4
- 238000005065 mining Methods 0.000 abstract description 2
- 238000005553 drilling Methods 0.000 description 6
- 239000000243 solution Substances 0.000 description 6
- 230000000694 effects Effects 0.000 description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 230000002093 peripheral effect Effects 0.000 description 3
- 239000003818 cinder Substances 0.000 description 2
- 238000007569 slipcasting Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000009530 blood pressure measurement Methods 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 239000011083 cement mortar Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000011405 expansive cement Substances 0.000 description 1
- 239000011440 grout Substances 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 238000007711 solidification Methods 0.000 description 1
- 230000008023 solidification Effects 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
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Classifications
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- 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
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- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Geology (AREA)
- Mining & Mineral Resources (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Consolidation Of Soil By Introduction Of Solidifying Substances Into Soil (AREA)
Abstract
The invention belongs to the technical field of coal mining, and discloses a long-distance pressure measuring hole belt pressure grouting hole sealing method, which adopts a step-subsection grouting hole sealing method and specifically comprises the following steps: s1, determining the positions of two adjacent grouting sections; s2, plugging two ends and a boundary point of the two grouting sections through cotton cloth, hemp threads or a bag to form a plugging section, and binding firmly by using iron wires; s3, calculating the grouting amount according to the volume of the first section grouting section, and injecting grouting materials into the first section grouting section through a first section grouting pipe by adopting non-pressure or low-pressure grouting; s4, after waiting for 6-8 hours, slowly injecting a grouting material into a second section of grouting section through a second section of grouting pipe, and injecting micro-expansion cement into cracks around the drill hole; after the slurry return pipe returns slurry, the slurry return pipe is rolled up and tied by an iron wire, and then the slurry is injected for 5-10 min. The invention reduces or eliminates the air leakage channel around the drill hole, ensures the accuracy of the coal gas pressure test data, and can be widely applied to the field of coal mines.
Description
Technical Field
The invention belongs to the technical field of coal mining, and particularly relates to a long-distance pressure measuring hole pressure grouting hole sealing method.
Background
Coal is the main energy of China, accounts for about 70% of the primary energy structure, and the position of the coal as the main energy can not be changed in a long period of time in the future, so that the coal industry is an important basic industry related to national economic pulse and energy safety. With the development of the country, ensuring the safety of the underground coal mine becomes a key point of increasing concern of the country. At present, about 50% of coal mines in China belong to high gas mines and coal and gas outburst mines, a non-pressure or low-pressure grouting hole sealing method is generally adopted in China, and after hole sealing, the phenomena that the pressure of drilling gas is far less than the pressure obtained by back calculation of the gas content of coal bodies, even the pressure of the tested gas is 0 and the like often occur. The problem that the original gas pressure of a coal body is difficult to be measured fundamentally and truly by the non-pressurized grouting hole sealing technology is solved, so that the problem that how to accurately measure the gas pressure of a coal seam accurately reflects the gas condition of a mine becomes a difficult problem which needs to be solved urgently according to the gas control of ' one mine and ' one side of one mine '.
Disclosure of Invention
The invention overcomes the defects of the prior art, and solves the technical problems that: the long-distance pressure measuring hole pressure grouting hole sealing method is provided to improve the accuracy of coal gas pressure test data.
In order to solve the technical problems, the invention adopts the technical scheme that: a step-subsection grouting hole sealing method is adopted in a long-distance pressure measuring hole belt-pressure grouting hole sealing method, and specifically comprises the following steps:
s1, determining the positions of two adjacent grouting sections;
s2, plugging two ends and a boundary point of the two grouting sections through cotton cloth, hemp threads or a bag to form a plugging section, and binding firmly by using iron wires;
s3, calculating the grouting amount according to the volume of the first section grouting section, and injecting grouting materials into the first section grouting section through a first section grouting pipe by adopting non-pressure or low-pressure grouting;
s4, after waiting for 6-8 hours, slowly injecting a grouting material into a second section of grouting section through a second section of grouting pipe, and injecting micro-expansion cement into cracks around the drill hole; after the slurry return pipe returns slurry, the slurry return pipe is rolled up and tied by an iron wire, and then the slurry is injected for 5-10 min.
One end of the first section of grouting section is 0.5m away from the orifice, the other end of the first section of grouting section is 0.3m away from the tail part of the sieve tube, one end of the second section of grouting section is adjacent to the tail part of the first section of grouting section, and the other end of the second section of grouting section is 1.5m away from the tail part of the sieve tube.
The injection material in the first section of grouting section is quick-setting cement, and the injection material in the second section of grouting section is micro-expansion cement.
The material injected into the first section of grouting section is quick-setting cement with a water-cement ratio of 0.6:1, and the material injected into the second section of grouting section is micro-expansion cement with a water-cement ratio of 0.8: 1.
And when the second section grouting section is blocked, the grouting pressure is kept between 0.8 and 1 MPa.
The step S2 further includes the steps of: and installing a plug at the port of the sieve tube, binding a wire mesh on the periphery of the sieve tube to prevent coal cinder from blocking sieve pores, and then lowering the galvanized steel pipe to a specified position in the pores.
Compared with the prior art, the invention has the following beneficial effects: the hole sealing method provided by the invention can avoid the problem that the pressure cannot be measured due to the blockage of the sieve pores caused by the fact that the slurry enters the pressure measuring air chamber in the common hole sealing method; meanwhile, due to the existence of the first section of grouting section, a good plugging effect is achieved, and slurry is prevented from flowing into the pressure measuring air chamber to plug the sieve tube; can take the area to slip casting at second section slip casting section, the thick liquid can effectively get into the peripheral crack of drilling and form the median, adopts little inflation cement can effectively play the effect of letting down pressure moreover, avoids the production of the peripheral secondary crack of drilling, prevents that coal wall crack from switching on with the pressure measurement air chamber and causing the drilling gas leakage, reduces or has eliminated the peripheral gas leakage passageway of drilling, has guaranteed the accuracy of coal gas pressure test data.
Drawings
FIG. 1 is a schematic diagram of a plugging section formed in a belt pressure grouting hole sealing method for a long-distance pressure measuring hole provided by the invention;
FIG. 2 is a schematic diagram of a first grouting section formed in the long-distance pressure measuring hole belt-pressing grouting hole sealing method provided by the invention;
fig. 3 is a schematic diagram of forming a second grouting section in the long-distance pressure measuring hole belt pressure grouting hole sealing method provided by the invention.
In the figure, 1-cotton, hemp wound sections or pouches; 2-slurry return pipe; 3-four-part galvanized steel pipe; 4-a second section of grouting pipe; 5-a first section of grouting pipe; 6-sieve tube; 7-a pressure measuring air chamber; 8-four-tube plug; 9-1-a first section grouting section; 9-2-second section grouting section.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below, and it is obvious that the described embodiments are some embodiments of the present invention, but not all 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, the invention provides a belt-pressure grouting hole sealing method for a long-distance pressure measuring hole, which adopts a step-subsection grouting hole sealing method and specifically comprises the following steps:
s1, determining the positions of two adjacent grouting sections; specifically, in this embodiment, one end of the first grouting section 9-1 is 0.5m from the orifice, and the other end is 0.3m from the tail of the screen 6. One end of the second section of grouting section 9-2 is adjacent to the tail of the first section of grouting section, and the other end is 1.5m away from the tail of the sieve tube 6.
S2, respectively welding baffles at corresponding positions on the galvanized steel pipe 3 according to the positions of two ends and the dividing point of the two grouting sections, then arranging cotton cloth, hemp threads or bag plugging sections with the length of about 0.4m at the baffles, and firmly binding by using iron wires, thereby dividing the hole sealing section into two sections. In addition, a plug 8 is arranged at the port of the sieve tube 6, a wire mesh is bound on the periphery of the sieve tube 6 to prevent coal cinder from blocking sieve holes, and then the galvanized steel pipe 3 is lowered to a specified position in the sieve holes.
S3, calculating the required grouting amount according to the volume of the first section grouting section, and injecting grouting materials into the first section grouting section 9-1 through the first section grouting pipe 5 by adopting non-pressure or low-pressure grouting; in addition, in the embodiment, the water cement ratio of the injection material quick-setting cement in the first grouting section 9-1 is 0.6: 1. When the first section grouting section is blocked, the grouting pressure is low or no pressure, so that the situation that slurry enters the pressure measuring air chamber 7 through the cotton cloth, hemp thread winding section or the periphery of the bag 1 due to overhigh pressure is avoided, and the sieve tube 6 is blocked by cement mortar so that the drilling pressure cannot be measured.
S4, waiting for 6-8 hours, proportioning the materials by using a stirring barrel according to the water cement ratio of 0.8:1, connecting a grouting pump, slowly injecting a grouting material into a second section grouting section 9-2 through a second section grouting pipe 4, and injecting micro-expansion cement into cracks around the drill hole; after the slurry return pipe 2 returns slurry, the slurry return pipe 2 is rolled up and tied by an iron wire, and then the slurry is injected for 5-10 min. In addition, in the embodiment, the injection material in the second section grouting section 9-2 is micro-expansive cement, and the water cement ratio is 0.8: 1. After solidification is carried out for 6-8h, the first section of cement grouting section is used as a plugging plug in the second section of grouting section, so that the grouting section is effectively plugged, and slurry is prevented from flowing into a pressure measuring air chamber to plug a sieve tube; and (3) carrying out high-pressure grouting on the first grouting section by adopting micro-expansion cement with a water-cement ratio of 0.8:1, keeping the grouting pressure at 0.8-1MPa, ensuring that the grout enters the cracks around the drill hole to form an isolation zone, and preventing the coal wall cracks from being communicated with a pressure measuring air chamber to cause air leakage of the drill hole.
And S5, installing a pressure gauge for pressure test.
After improvement, the hole sealing of the long-distance pressure measuring hole is mainly divided into two steps, namely sealing a first section grouting section and sealing a second section grouting section. And the grouting materials, the water cement ratio, the grouting pressure and the like of the first section grouting section and the second section grouting section are different. By adopting the hole sealing method, the problem that the pressure cannot be measured due to the blockage of the sieve pores caused by the fact that the slurry enters the pressure measuring air chamber in the common hole sealing method can be avoided; meanwhile, due to the existence of the first section grouting section, a good plugging effect is achieved, pressurized grouting can be conducted in the second section grouting section, the slurry can effectively enter cracks around the drill hole, the pressure yielding effect can be effectively achieved by adopting micro-expansion cement, the generation of secondary cracks around the drill hole is avoided, air leakage channels around the drill hole are reduced or eliminated, and the accuracy of coal gas pressure test data is guaranteed.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.
Claims (6)
1. A pressure grouting hole sealing method for a long-distance pressure measuring hole is characterized in that a step-subsection grouting hole sealing method is adopted, and the method specifically comprises the following steps:
s1, determining the positions of two adjacent grouting sections;
s2, plugging two ends and a boundary point of the two grouting sections through cotton cloth, hemp threads or a bag to form a plugging section, and binding firmly by using iron wires;
s3, calculating the required grouting amount according to the volume of the first section grouting section, and injecting grouting materials into the first section grouting section (9-1) through a first section grouting pipe (5) by adopting non-pressure or low-pressure grouting;
s4, after waiting for 6-8h, slowly injecting a grouting material into a second section of grouting section (9-2) through a second section of grouting pipe (4), and injecting micro-expansion cement into cracks around the drill hole; after the slurry return pipe (2) returns slurry, the slurry return pipe (2) is rolled up and tied by an iron wire, and then the slurry is injected for 5-10 min.
2. A long distance load cell belt grouting hole sealing method according to claim 1, characterized in that one end of the first section grouting section (9-1) is 0.5m from the hole opening, the other end is 0.3m from the tail of the screen pipe (6), one end of the second section grouting section (9-2) is adjacent to the tail of the first section grouting section, and the other end is 1.5m from the tail of the screen pipe (6).
3. The belt-pressure grouting hole sealing method for the long-distance manometers according to claim 1, characterized in that the injection material in the first grouting section (9-1) is quick-setting cement, and the injection material in the second grouting section (9-2) is micro-expansion cement.
4. The belt-pressure grouting hole sealing method for the long-distance manometers according to claim 1, characterized in that the material injected into the first section grouting section (9-1) is quick-setting cement with a water-cement ratio of 0.6:1, and the material injected into the second section grouting section (9-2) is micro-expansion cement with a water-cement ratio of 0.8: 1.
5. The belt-pressure grouting hole sealing method for the long-distance pressure measuring hole according to claim 4, wherein the grouting pressure is kept between 0.8 and 1MPa when the second grouting section is sealed.
6. The belt-pressure grouting sealing method for the long-distance load cell according to claim 4, wherein the step S2 further comprises the following steps: and a plug (8) is arranged at the port of the sieve tube (6), a wire mesh is bound on the periphery of the sieve tube to prevent coal slag from blocking sieve pores, and then the galvanized steel pipe (3) is lowered to a specified position in the pores.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911108342.4A CN110984906A (en) | 2019-11-13 | 2019-11-13 | Long-distance pressure measuring hole with-pressure grouting hole sealing method |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201911108342.4A CN110984906A (en) | 2019-11-13 | 2019-11-13 | Long-distance pressure measuring hole with-pressure grouting hole sealing method |
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| CN110984906A true CN110984906A (en) | 2020-04-10 |
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| CN201911108342.4A Pending CN110984906A (en) | 2019-11-13 | 2019-11-13 | Long-distance pressure measuring hole with-pressure grouting hole sealing method |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111502641A (en) * | 2020-04-27 | 2020-08-07 | 淮南矿业(集团)有限责任公司 | Gas pressure measuring device and gas pressure measuring method |
| CN112031827A (en) * | 2020-09-16 | 2020-12-04 | 山东东山王楼煤矿有限公司 | Transfer pressure stabilizing device for realizing slurry transportation in overlying strata isolation grouting |
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| CN112031827A (en) * | 2020-09-16 | 2020-12-04 | 山东东山王楼煤矿有限公司 | Transfer pressure stabilizing device for realizing slurry transportation in overlying strata isolation grouting |
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Application publication date: 20200410 |