CN109339736B - Solid-liquid two-phase hole sealing device and process for gas extraction drilling - Google Patents
Solid-liquid two-phase hole sealing device and process for gas extraction drilling Download PDFInfo
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- CN109339736B CN109339736B CN201811557763.0A CN201811557763A CN109339736B CN 109339736 B CN109339736 B CN 109339736B CN 201811557763 A CN201811557763 A CN 201811557763A CN 109339736 B CN109339736 B CN 109339736B
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- 238000007789 sealing Methods 0.000 title claims abstract description 234
- 238000000605 extraction Methods 0.000 title claims abstract description 133
- 238000005553 drilling Methods 0.000 title claims abstract description 81
- 239000007788 liquid Substances 0.000 title claims abstract description 36
- 238000000034 method Methods 0.000 title claims abstract description 32
- 230000008569 process Effects 0.000 title claims abstract description 29
- 239000007791 liquid phase Substances 0.000 claims abstract description 57
- 239000007790 solid phase Substances 0.000 claims abstract description 56
- 239000012071 phase Substances 0.000 claims abstract description 25
- 238000005422 blasting Methods 0.000 claims abstract description 9
- 230000006855 networking Effects 0.000 claims abstract description 7
- 239000003566 sealing material Substances 0.000 claims description 102
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 25
- 239000003795 chemical substances by application Substances 0.000 claims description 17
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- 239000003607 modifier Substances 0.000 claims description 14
- 238000003756 stirring Methods 0.000 claims description 14
- 238000004880 explosion Methods 0.000 claims description 13
- 239000002002 slurry Substances 0.000 claims description 12
- 239000003638 chemical reducing agent Substances 0.000 claims description 11
- 239000004568 cement Substances 0.000 claims description 10
- 239000003292 glue Substances 0.000 claims description 9
- 239000000463 material Substances 0.000 claims description 9
- 238000011049 filling Methods 0.000 claims description 8
- 230000009471 action Effects 0.000 claims description 6
- 230000006835 compression Effects 0.000 claims description 5
- 238000007906 compression Methods 0.000 claims description 5
- 239000003431 cross linking reagent Substances 0.000 claims description 4
- 239000003906 humectant Substances 0.000 claims description 4
- 210000001503 joint Anatomy 0.000 claims description 3
- 239000012466 permeate Substances 0.000 claims description 3
- 238000012216 screening Methods 0.000 claims description 3
- 229920001938 Vegetable gum Polymers 0.000 claims description 2
- 238000001514 detection method Methods 0.000 claims description 2
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- 238000002360 preparation method Methods 0.000 claims description 2
- 230000000694 effects Effects 0.000 abstract description 11
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- 239000003245 coal Substances 0.000 description 6
- 241000196324 Embryophyta Species 0.000 description 4
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- 229920002635 polyurethane Polymers 0.000 description 3
- 239000004814 polyurethane Substances 0.000 description 3
- 239000011435 rock Substances 0.000 description 3
- IANQTJSKSUMEQM-UHFFFAOYSA-N 1-benzofuran Chemical compound C1=CC=C2OC=CC2=C1 IANQTJSKSUMEQM-UHFFFAOYSA-N 0.000 description 2
- CDOUZKKFHVEKRI-UHFFFAOYSA-N 3-bromo-n-[(prop-2-enoylamino)methyl]propanamide Chemical compound BrCCC(=O)NCNC(=O)C=C CDOUZKKFHVEKRI-UHFFFAOYSA-N 0.000 description 2
- ZRALSGWEFCBTJO-UHFFFAOYSA-N Guanidine Chemical compound NC(N)=N ZRALSGWEFCBTJO-UHFFFAOYSA-N 0.000 description 2
- 239000002253 acid Substances 0.000 description 2
- 235000019329 dioctyl sodium sulphosuccinate Nutrition 0.000 description 2
- 238000001704 evaporation Methods 0.000 description 2
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- 239000007787 solid Substances 0.000 description 2
- 239000004094 surface-active agent Substances 0.000 description 2
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 1
- 244000025254 Cannabis sativa Species 0.000 description 1
- 235000012766 Cannabis sativa ssp. sativa var. sativa Nutrition 0.000 description 1
- 235000012765 Cannabis sativa ssp. sativa var. spontanea Nutrition 0.000 description 1
- 235000008733 Citrus aurantifolia Nutrition 0.000 description 1
- 229920002907 Guar gum Polymers 0.000 description 1
- CHJJGSNFBQVOTG-UHFFFAOYSA-N N-methyl-guanidine Natural products CNC(N)=N CHJJGSNFBQVOTG-UHFFFAOYSA-N 0.000 description 1
- 244000000231 Sesamum indicum Species 0.000 description 1
- 235000003434 Sesamum indicum Nutrition 0.000 description 1
- 244000275012 Sesbania cannabina Species 0.000 description 1
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 235000011941 Tilia x europaea Nutrition 0.000 description 1
- 239000002390 adhesive tape Substances 0.000 description 1
- 229910001570 bauxite Inorganic materials 0.000 description 1
- 229910021538 borax Inorganic materials 0.000 description 1
- 239000011575 calcium Substances 0.000 description 1
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- 238000013461 design Methods 0.000 description 1
- SWSQBOPZIKWTGO-UHFFFAOYSA-N dimethylaminoamidine Natural products CN(C)C(N)=N SWSQBOPZIKWTGO-UHFFFAOYSA-N 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000012467 final product Substances 0.000 description 1
- 238000005187 foaming Methods 0.000 description 1
- 238000000227 grinding Methods 0.000 description 1
- 229960002154 guar gum Drugs 0.000 description 1
- 235000010417 guar gum Nutrition 0.000 description 1
- 239000000665 guar gum Substances 0.000 description 1
- 239000011487 hemp Substances 0.000 description 1
- 239000004571 lime Substances 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000005065 mining Methods 0.000 description 1
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- -1 polypropylene acetamide Polymers 0.000 description 1
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- 230000009467 reduction Effects 0.000 description 1
- 239000004328 sodium tetraborate Substances 0.000 description 1
- 235000010339 sodium tetraborate Nutrition 0.000 description 1
- 238000007711 solidification 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
-
- 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
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/10—Geothermal energy
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- 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 invention discloses a gas extraction drilling solid-liquid two-phase hole sealing device, which comprises a first bag, a second bag, a third bag, a primary grouting pipe and a secondary grouting pipe, wherein a first hole sealing section is arranged between the first bag and the second bag, and a second hole sealing section is arranged between the second bag and the third bag; a blasting valve positioned in the first hole sealing section is arranged on the primary grouting pipe; the other end of the secondary grouting pipe is positioned in the second hole sealing section and is communicated with the second hole sealing section through a second one-way valve. The invention also discloses a solid-liquid two-phase hole sealing process for the gas extraction drilling hole, which comprises the steps of networking extraction after solid phase hole sealing of the first hole sealing section, periodically detecting the gas extraction concentration of the extraction drilling hole with the solid phase hole sealing, and carrying out liquid phase hole sealing of the second hole sealing section on the gas leakage extraction drilling hole, and then continuing the extraction. The liquid phase hole sealing operation can be carried out on the extraction drilling holes with poor hole sealing and air leakage, the liquid sealing effect can be maintained regularly, and the complicated construction of encrypting the extraction drilling holes is avoided.
Description
Technical Field
The invention belongs to the technical field of coal mine gas extraction, and relates to a solid-liquid two-phase hole sealing device and process for gas extraction drilling.
Background
The gas extraction is an important measure for solving and preventing the coal mine gas disasters, and in the gas extraction process, the hole sealing technology influences the working efficiency of the gas extraction to a great extent. If the hole sealing quality of the gas extraction drilling hole is poor, the reduction of the coal seam gas flow pressure difference is caused, the gas extraction is not facilitated to be carried out rapidly, the gas extraction time is prolonged, the utilization efficiency of extraction equipment is reduced, and a large amount of intolerable energy consumption of coal mine enterprises is increased. Therefore, the improvement of the hole sealing quality of the gas extraction drilling hole is a basic guarantee for guaranteeing the safety and the high efficiency of underground gas extraction, and has important significance for mine gas control and utilization.
The hole sealing materials commonly adopted at home and abroad at present mainly comprise cement paste, polyurethane, yellow mud, hole sealing by a hole packer and the like. The commonly adopted hole sealing processes mainly comprise a single plugging process, a single injection process, two plugging processes, a single injection process and the like. The hole sealing material and the process have the advantages of being popularized and applied correspondingly in different areas, but the gas extraction rate and the gas extraction concentration of many mines in China still cannot meet the national standard requirements. The current situation that the hole sealing quality of the extraction drilling hole is poor and the air leakage is caused is fully reflected, and the hole sealing material and the process are indirectly reflected to have certain limitations. At present, most of holes are still higher in initial gas concentration of hole sealing, but the gas extraction concentration is fast in decay, and the gas with higher concentration cannot be maintained, so that the gas extraction concentration and flow rate are not up to the standard, and the gas extraction effect is severely restricted. There are serious disadvantages in the hole sealing materials and processes, and further improvement is needed.
For the rapid attenuation of the gas extraction concentration in the existing borehole, the existing hole sealing method is not suitable for repairing the extraction borehole with poor hole sealing and air leakage. Therefore, it is urgent to find a device and a method which are simple to operate and control, good in hole sealing effect, low in cost, and capable of performing secondary hole sealing operation on a hole with poor hole sealing.
Disclosure of Invention
The invention aims to solve the defects in the prior art, and provides a solid-liquid two-phase hole sealing device and a process for gas extraction drilling, which can adopt a liquid phase hole sealing material to perform secondary hole sealing operation on drilling holes with poor hole sealing and air leakage after the solid phase hole sealing material is adopted for the first time to seal the hole wall micro-cracks, so that the hole wall micro-cracks are sealed, the hole sealing effect is further enhanced, the gas extraction concentration can be ensured to reach the standard again, the aim of improving the gas extraction concentration and the extraction efficiency is finally realized, and effective technical support is provided for efficient control of gas in mining areas.
The invention aims to solve the problems, and adopts the technical scheme that the solid-liquid two-phase hole sealing device for the gas extraction drilling hole comprises a first bag, a second bag, a third bag, a primary grouting pipe and a secondary grouting pipe, wherein the primary grouting pipe respectively penetrates through the first bag, the second bag and the third bag along the direction from the hole opening of the drilling hole to the hole bottom, one side of the first bag, which is close to the hole opening of the drilling hole, is provided with three first check valves arranged at intervals, the first bag, the second bag and the third bag are correspondingly communicated with one first check valve, one end of the primary grouting pipe, which is close to the hole opening of the drilling hole, is a primary grouting inlet, and one end of the primary grouting pipe, which is close to the hole bottom of the drilling hole, is plugged.
The first bag, the second bag and the third bag are elastic bags, the first bag, the second bag and the third bag are in close contact with the wall of the drilled hole after grouting expansion, a gap between the first bag and the second bag is marked as a first hole sealing section, and a gap between the second bag and the third bag is marked as a second hole sealing section; and a blasting valve is arranged on the primary grouting pipe and is positioned in the first hole sealing section.
The secondary grouting pipe passes through the first bag and the second bag along the direction from the hole opening of the drill hole to the bottom of the hole, one end of the secondary grouting pipe, which is close to the hole opening of the drill hole, is a secondary grouting inlet, and the other end of the secondary grouting pipe is positioned in the second hole sealing section and is communicated with the second hole sealing section through a second one-way valve.
The first bag and the second bag have the same structure, and holes for the primary grouting pipe, the secondary grouting pipe and the gas extraction sleeve to pass through are respectively formed in the first bag and the second bag; the third bag is provided with a hole site for the primary grouting pipe and the gas extraction sleeve to pass through; two ends of the first bag, the second bag and the third bag are respectively fixedly arranged on the primary grouting pipe through clamping rings.
The explosion valve is positioned in the middle of the first hole sealing section; the opening pressure of the explosion valve is simultaneously larger than the opening pressure of the first one-way valve and the opening pressure of the second one-way valve, and the opening pressure of the explosion valve is simultaneously smaller than the effective compression pressures of the first bag, the second bag and the third bag.
Preferably, the length of the second hole sealing section is less than one half of the length of the first hole sealing section.
A gas extraction drilling solid-liquid two-phase hole sealing process using the hole sealing device comprises the following steps:
step one, preparing work before hole sealing: the gas extraction drilling solid-liquid two-phase hole sealing device is marked as a hole sealing device, a gas extraction sleeve is connected with the hole sealing device, and the gas extraction sleeve with the hole sealing device fixed is sent into the drilling;
step two, solid-phase hole sealing is carried out on the first hole sealing section: firstly preparing a solid-phase hole sealing material by using a hole sealing material a, and then injecting the solid-phase hole sealing material into a first hole sealing section through a grouting pump and a first grouting pipe to finish solid-phase hole sealing of the first hole sealing section;
thirdly, networking extraction and periodically screening leakage extraction drilling holes: after the solid phase hole sealing of the first hole sealing section is finished, after the solid phase hole sealing material in the first hole sealing section is primarily solidified, the gas extraction sleeve is in butt joint with the gas extraction pipeline, and then gas is extracted in a networking way; periodically detecting the gas extraction concentration of the extraction drilling hole with the solid-phase hole sealing of the first hole sealing section, evaluating the attenuation degree of the gas extraction concentration, and timely finding out the gas leakage of the extraction drilling hole; if the gas extraction concentration of the extraction drilling hole is reduced to 30% or below, liquid phase hole sealing of the second hole sealing section is needed, and if the gas extraction concentration of the extraction drilling hole is always maintained to be above 30%, the liquid phase hole sealing of the second hole sealing section is not needed for saving the cost;
step four, carrying out liquid phase hole sealing on the second hole sealing section on the leaked extraction drilling hole: firstly preparing a liquid-phase hole sealing material by using the hole sealing material b, and then injecting the liquid-phase hole sealing material into a second hole sealing section through a grouting pump and a second grouting pipe to finish liquid-phase hole sealing of the second hole sealing section;
step five, periodically maintaining the second hole sealing section: after the liquid phase hole sealing of the second hole sealing section is finished, continuously extracting gas; and (3) carrying out periodic detection on gas extraction concentration on the extraction drilling hole subjected to liquid phase hole sealing of the second hole sealing section, timely finding out the gas leakage extraction drilling hole, and repeating the step four and the step five on the second hole sealing section of the gas leakage extraction drilling hole.
Preferably, the specific steps for preparing the solid-phase hole sealing material in the second step are as follows: filling a certain amount of water into a stirring barrel in advance, adding a hole sealing material a into the stirring barrel according to a water-material proportioning relationship of 0.8:1, starting a stirrer after the hole sealing material a is finished, and uniformly mixing slurry to obtain a solid phase hole sealing material;
the specific steps of injecting the solid phase hole sealing material in the second step are as follows: a first quick connector is used for connecting an outlet of a grouting pump with a primary grouting pipe of a hole sealing device, the grouting pump is started, and solid-phase hole sealing materials are injected into the primary grouting pipe; when the pressure of the grouting pump reaches the opening pressure of the first one-way valve, the solid-phase hole sealing material flows into and fills the first bag, the second bag and the third bag respectively; as the pressure of the grouting pump continues to rise, when the pressure of the grouting pump reaches the opening pressure of the explosion valve, the solid-phase hole sealing material flows into the first hole sealing section and begins to fill the first hole sealing section; after the first hole sealing section is filled, continuously injecting a solid phase hole sealing material, wherein the solid phase hole sealing material permeates into surrounding cracks of the wall of the drilling hole under the action of pressure; when the grouting pump pressure is rapidly increased, the grouting pump is closed, and solid-phase hole sealing of the first hole sealing section is completed.
Preferably, the specific steps for preparing the liquid phase hole sealing material in the fourth step are as follows: filling a certain amount of water into a stirring barrel in advance, adding a hole sealing material b into the stirring barrel according to a water-material proportioning relationship of 200:1, starting a stirrer after the completion, uniformly mixing the liquid, and preparing a glue solution to obtain a liquid phase hole sealing material;
the specific steps of injecting the liquid phase hole sealing material in the fourth step are as follows: a second quick connector is used for connecting an outlet of the grouting pump with a secondary grouting pipe of the hole sealing device, the grouting pump is started, and liquid phase hole sealing materials are injected into the secondary grouting pipe; when the pressure of the grouting pump reaches the opening pressure of the second one-way valve, the liquid phase hole sealing material flows into the second hole sealing section, and the second hole sealing section starts to be filled; after the second hole sealing section is filled, continuously injecting liquid phase hole sealing materials, wherein the liquid phase hole sealing materials penetrate into surrounding cracks of the wall of the drilling hole under the action of pressure; and when the grouting pump pressure is rapidly increased, closing the grouting pump to finish liquid phase hole sealing of the second hole sealing section.
Preferably, the hole sealing material a in the second step is prepared by mixing and preparing 1250-mesh or finer superfine cement, a water reducing agent, an accelerator, an expanding agent and a modifier, wherein the superfine cement is prepared by the following steps of: water reducing agent: and (3) an expanding agent: accelerating agent: the weight ratio of the modifier is 100:0.3 to 0.7: 8-15: 0.2 to 0.5:0.2 to 0.5.
Preferably, the ultra-fine cement: water reducing agent: and (3) an expanding agent: accelerating agent: the weight ratio of the modifier is 100:0.5:10:0.3:0.3.
preferably, the hole sealing material b in the fourth step is prepared by mixing vegetable gum, a cross-linking agent, a humectant and a modifier.
By adopting the technical scheme, the invention has the following advantages:
when the gas extraction drilling solid-liquid two-phase hole sealing device is adopted, the two ends of the first bag, the second bag and the third bag are fixedly arranged on the primary grouting pipe through the clamping rings respectively, the hole positions of the bags, which are contacted with the secondary grouting pipe and the gas extraction sleeve, are automatically clung to the pipe wall after grouting expansion of the bags, so that the plug effect is realized, and the bag is convenient and quick to fix.
The length of the second hole sealing section is smaller than one half of the length of the first hole sealing section, so that excessive consumption of liquid phase hole sealing materials used for hole sealing in the second hole sealing section can be avoided, and the cost is saved.
According to the invention, the blasting valve arranged on the primary grouting pipe is positioned in the middle of the first hole sealing section, so that the space grouting speeds of the two sides of the blasting valve in the first hole sealing section are consistent.
When the maximum grouting pressure of the slurry (namely the solid-phase hole sealing material) adopted by the grouting of the first hole sealing section is 1.5 MPa, the defect that capillary pressure enters into a communicated micro-crack with the hole wall crack width of more than 3 mu m can be overcome. The water-material ratio of the prepared slurry is 0.8:1, so that the water content and the foaming rate of the slurry are reduced, the slurry can be quickly solidified and expanded, and large shrinkage can not be generated during solidification.
When the glue solution (namely the liquid phase hole sealing material) adopted by the second hole sealing section injection liquid is under the maximum injection liquid pressure of 1.5 MPa, the defect that capillary pressure enters into the ultra-micro cracks communicated with the hole wall crack width of more than 75 and nm can be overcome. The prepared glue solution is not solidified, the evaporation rate is extremely low, and the liquid sealing effect can be maintained for more than 1 month.
According to the invention, after the solid-phase hole sealing of the first hole sealing section, the liquid-phase hole sealing operation of the second hole sealing section can be carried out on the extraction drilling holes with poor hole sealing and air leakage, the communicated ultra-micro cracks above 75 nm can be plugged, the hole sealing effect is further enhanced, and the liquid sealing effect of the second hole sealing section can be regularly maintained, so that the gas extraction holes keep higher extraction concentration and lower attenuation level, and the effect is good. This measure avoids the tedious construction of the encryption extraction drilling.
In conclusion, the gas extraction drilling solid-liquid two-phase hole sealing device and the process have the advantages of simplicity in operation, energy conservation, strong applicability, safety, high efficiency and the like, can perform liquid phase hole sealing operation on extraction drilling with poor hole sealing and air leakage, can perform regular maintenance on a liquid sealing effect, avoid complicated construction of encryption extraction drilling, are simple in operation and control, high in efficiency, consume less hole sealing materials and low in cost, ensure that the gas extraction holes keep higher extraction concentration and lower attenuation level after hole sealing, and are good in effect.
Drawings
Fig. 1 is a schematic structural view of the present invention.
Detailed Description
As shown in fig. 1, the solid-liquid two-phase hole sealing device for gas extraction drilling holes comprises a first bag 1, a second bag 2, a third bag 3, a primary grouting pipe 4 and a secondary grouting pipe 5, wherein the first bag 1 and the second bag 2 have the same structure, and holes for the passage of the primary grouting pipe 4, the secondary grouting pipe 5 and the gas extraction sleeve 10 are respectively formed in the first bag 1 and the second bag 2; the third bag 3 is provided with a hole site for the primary grouting pipe 4 and the gas extraction sleeve 10 to pass through; two ends of the first bag 1, the second bag 2 and the third bag 3 are respectively fixedly arranged on the primary grouting pipe 4 through a clamping ring 6. When the first bag 1, the second bag 2 and the third bag 3 are fixed, the fixing device is not limited to the snap ring 6, and steel wires, hemp ropes, strong adhesive tapes or the like can be used.
The primary grouting pipe 4 passes through the inside of a bag 1, a bag 2 and a bag 3 respectively along the hole bottom direction of a drilling hole 11, the bag 1 is close to one side of the hole bottom of the drilling hole 11, the primary grouting pipe 4 is provided with three first check valves 7 arranged at intervals, the bag 1, the bag 2 and the bag 3 are correspondingly communicated with one first check valve 7 respectively, one end of the primary grouting pipe 4 close to the hole bottom of the drilling hole is a primary grouting inlet, the primary grouting pipe 4 is communicated with a grouting pump through a first quick connector, and one end of the primary grouting pipe 4 close to the hole bottom of the drilling hole 11 is plugged.
The first bag 1, the second bag 2 and the third bag 3 are elastic bags, water passing and slurry passing can be guaranteed, superfine cement slurry is prevented from exuding, the first bag 1, the second bag 2 and the third bag 3 are in close contact with the hole wall of the drilling hole 11 after grouting and expansion, a gap between the first bag 1 and the second bag 2 is marked as a first hole sealing section, and a gap between the second bag 2 and the third bag 3 is marked as a second hole sealing section; the length of the second hole sealing section is less than one half of the length of the first hole sealing section, the length of the second hole sealing section cannot be too long and is less than one half of the length of the first hole sealing section, excessive consumption of hole sealing materials can be avoided, and cost is saved.
The primary grouting pipe 4 is provided with a blasting valve 8, and the blasting valve 8 is positioned in the middle of the first hole sealing section, so that the grouting speed of the space positioned at the two sides of the blasting valve 8 in the first hole sealing section is consistent.
The secondary grouting pipe 5 passes through the first bag 1 and the second bag 2 along the direction from the hole opening of the drilling hole 11 to the bottom of the hole, one end of the secondary grouting pipe 5, which is close to the hole opening of the drilling hole 11, is a secondary grouting inlet, the secondary grouting pipe can be communicated with a grouting pump through a second quick connector, and the other end of the secondary grouting pipe 5 is positioned in a second hole sealing section and is communicated with the second hole sealing section through a second one-way valve 9.
The opening pressure of the explosion valve 8 is simultaneously larger than the opening pressure of the first one-way valve 7 and the opening pressure of the second one-way valve 9, and the opening pressure of the explosion valve 8 is simultaneously smaller than the effective compression pressures of the first bag 1, the second bag 2 and the third bag 3. In specific implementation, the effective compression pressure of the first bag 1, the second bag 2 and the third bag 3 is 2 MPa, the opening pressure of the first check valve 7 and the second check valve 9 is 0.5 MPa, and the opening pressure of the explosion valve 8 can be 1.2 MPa.
The gas extraction drilling solid-liquid two-phase hole sealing process using the hole sealing device comprises the following steps of:
step one, preparing work before hole sealing: after the gas extraction drilling hole 11 is formed, the hole sweeping and back drilling are carried out; the gas extraction drilling solid-liquid two-phase hole sealing device is marked as a hole sealing device, a gas extraction flower pipe and a gas extraction solid pipe are connected to form a gas extraction sleeve 10 according to the design requirement of the extraction sleeve, and the gas extraction sleeve 10 passes through the interiors of a first bag 1, a second bag 2 and a third bag 3; according to the hole sealing parameters, fixing the hole sealing device at a certain position of a solid pipe section in the gas extraction sleeve 10, feeding the gas extraction sleeve 10 fixed with the hole sealing device into the drill hole 11, and fixing the gas extraction sleeve 10 and the wall of the drill hole 11 by using polyurethane after the gas extraction sleeve 10 and the hole sealing device enter the preset hole sealing position of the drill hole 11.
The hole sealing parameters according to the first step must ensure that the hole sealing section of the seam bedding hole is positioned in a stress concentration zone, and the hole sealing section of the bedding hole is positioned in a lithology compact and hole crack non-developing rock layer section.
Step two, solid-phase hole sealing is carried out on the first hole sealing section: firstly, preparing a solid-phase hole sealing material by using a hole sealing material a; and injecting the solid-phase hole sealing material into the first hole sealing section through a grouting pump and a first grouting pipe to finish solid-phase hole sealing of the first hole sealing section.
Preparing a solid phase hole sealing material: filling a certain amount of water into a stirring barrel in advance, adding a hole sealing material a (namely 0.8 part by weight of water and 1 part by weight of hole sealing material a) into the stirring barrel according to a water-material proportioning relationship of 0.8:1, starting the stirrer after the completion, and uniformly mixing the slurry to obtain the solid phase hole sealing material.
The hole sealing material a is prepared by mixing and preparing 1250-mesh (particle size is less than or equal to 10 mu m) superfine cement, a water reducing agent, an accelerator, an expanding agent and a modifier, wherein the superfine cement is prepared by mixing and preparing: water reducing agent: and (3) an expanding agent: accelerating agent: the optimal weight ratio of the modifier is 100:0.5:10:0.3:0.3.
wherein the water reducer is a polycarboxylic acid water reducer (such as a polycarboxylic acid high-efficiency water reducer).
The accelerator is a concrete accelerator, and is prepared by grinding aluminum oxide clinker (namely bauxite, calcined soda and calcined lime which are burned according to a proportion) to obtain the final product (for example, J85 type concrete accelerator, and standard JC477-2005 is implemented).
The expanding agent is a concrete expanding agent, and belongs to calcium sulfoaluminate type concrete expanding agents (such as UEA type concrete expanding agents, and the standard JC476-2001 is implemented).
The modifier is fast T (fully called dioctyl sodium sulfosuccinate) and is a surfactant.
The slurry formed by mixing and stirring water and the hole sealing material a according to the ratio of 0.8:1 has the surface tension of 26.33 mN.m -1 The contact angle range of the slurry and the coal rock is 12-18 degrees, and when the maximum grouting pressure is 1.5 MPa, the slurry can overcome woolThe pipe pressure enters the micro-cracks communicated with the crack width of the hole wall of the drill hole 11 by more than 3 mu m.
Injecting a solid phase hole sealing material: a first quick connector is used for connecting an outlet of a grouting pump with a primary grouting pipe 4 of the hole sealing device, the grouting pump is started, and solid-phase hole sealing materials are injected into the primary grouting pipe 4; when the pressure of the grouting pump reaches the opening pressure of the first one-way valve 7, the solid-phase hole sealing material flows into and fills the first bag 1, the second bag 2 and the third bag 3 respectively; after the first bag 1, the second bag 2 and the third bag 3 are full, three plugs with pressure are generated at preset hole sealing positions of the drill holes 11, and two hole sealing grouting spaces are generated in the middle of the three plugs with pressure; as the pressure of the grouting pump continues to rise, when the pressure of the grouting pump reaches the opening pressure of the explosion valve 8, the solid-phase hole sealing material flows into the first hole sealing section (namely, between the first bag 1 and the second bag 2) to start filling the first hole sealing section; after the first hole sealing section is filled, continuously injecting a solid phase hole sealing material (the injection maximum pressure is maintained at 1.5 MPa), and penetrating the solid phase hole sealing material into surrounding cracks of the wall of the borehole 11 under the action of pressure; when the grouting pump pressure is rapidly increased, the grouting pump is closed, and solid-phase hole sealing of the first hole sealing section is completed.
Thirdly, networking extraction and periodically screening leakage extraction drilling holes 11: after the solid phase hole sealing of the first hole sealing section is finished, after the solid phase hole sealing material in the first hole sealing section is primarily solidified, the gas extraction sleeve 10 is in butt joint with a gas extraction pipeline, and then gas is extracted in a networking way; periodically detecting the gas extraction concentration of the extraction drilling hole 11 subjected to solid-phase hole sealing of the first hole sealing section, evaluating the attenuation degree of the gas extraction concentration, and timely finding out the gas leakage of the extraction drilling hole 11; if the gas extraction concentration of the extraction drill hole 11 is reduced to 30% or less, the second hole sealing section liquid phase hole sealing is required, and if the gas extraction concentration of the extraction drill hole 11 is always maintained to be above 30%, the second hole sealing section liquid phase hole sealing is not required in order to save the cost.
Step four, carrying out liquid phase hole sealing on the second hole sealing section on the leaked extraction drilling hole 11: firstly, preparing a liquid phase hole sealing material by using a hole sealing material b; and then injecting the liquid-phase hole sealing material into the second hole sealing section through a grouting pump and a second grouting pipe to finish liquid-phase hole sealing of the second hole sealing section.
Preparing a liquid phase hole sealing material: filling a certain amount of water into a stirring barrel in advance, adding a hole sealing material b (namely 200 parts by weight of water and 1 part by weight of hole sealing material b) into the stirring barrel according to a water-material proportioning relationship of 200:1, starting a stirrer after the completion, uniformly mixing the liquid, and preparing a glue solution to obtain the liquid phase hole sealing material.
The hole sealing material b in the fourth step is prepared by mixing plant gum with better water solubility (the plant gum adopts guanidine gum with better water solubility, or natural plant gum materials such as sesbania gum, guar gum, sesame gum, coumarone and the like can be used for replacing the plant gum), a cross-linking agent, a humectant and a modifier.
Wherein the cross-linking agent is borax, the humectant is polypropylene acetamide, the modifier is fast T (dioctyl sodium sulfosuccinate) and the modifier is a surfactant.
The preparation principle of the hole sealing material b is as follows: the glue solution formed by mixing and stirring water and the hole sealing material b according to the ratio of 200:1 only allows trace residues to be left after evaporation and drying, and the subsequent re-injection or repeated injection cannot be influenced; the viscosity of the glue solution is not lower than 300 mPa.s, and the surface tension is less than 31 mN.m -1 The contact angle range of the glue solution and the coal rock is 20-28 degrees, and when the maximum pressure of the injected liquid is 1.5 MPa, the glue solution can overcome the defect that capillary pressure enters into ultra-micro cracks with the hole wall crack width of more than 75 nm.
Injecting a liquid phase hole sealing material: a second quick connector is used for connecting the outlet of the grouting pump with a secondary grouting pipe 5 of the hole sealing device, the grouting pump is started, and liquid phase hole sealing materials begin to be injected into the secondary grouting pipe 5; when the pressure of the grouting pump reaches the opening pressure of the second one-way valve 9, the liquid phase hole sealing material flows into the second hole sealing section (namely, between the second bag 2 and the third bag 3) to start filling the second hole sealing section; after the second hole sealing section is filled, continuously injecting a liquid phase hole sealing material (the injection maximum pressure is maintained at 1.5 MPa), and allowing the liquid phase hole sealing material to permeate into surrounding cracks of the wall of the borehole 11 under the action of pressure; and when the grouting pump pressure is rapidly increased, closing the grouting pump to finish liquid phase hole sealing of the second hole sealing section.
Step five, periodically maintaining the second hole sealing section: after the liquid phase hole sealing of the second hole sealing section is finished, continuously extracting gas; and (3) periodically detecting the gas extraction concentration of the extraction drilling hole 11 subjected to liquid phase hole sealing of the second hole sealing section, timely finding out the gas leakage of the extraction drilling hole 11, and repeating the step four and the step five on the second hole sealing section of the gas leakage extraction drilling hole 11.
The solid-phase hole sealing material and the liquid-phase hole sealing material can be applied to the solid-liquid two-phase hole sealing process of the gas extraction drilling of the invention, and can also be applied to the existing two-plug one-injection process, wherein two plugs can be polyurethane adopted in the prior art, the solid-phase hole sealing material of the invention can also be adopted, and one injection can be the solid-phase hole sealing material of the invention and the liquid-phase hole sealing material of the invention, so that the gas extraction drilling solid-liquid two-phase hole sealing material has wide applicability.
The snap ring 6, the first check valve 7, the second check valve 9 and the explosion valve 8 are conventional devices, and the specific structure is not described in detail.
The present embodiment is not limited in any way by the shape, material, structure, etc. of the present invention, and any simple modification, equivalent variation and modification made to the above embodiments according to the technical substance of the present invention are all included in the scope of protection of the technical solution of the present invention.
Claims (9)
1. The utility model provides a gas drainage drilling solid-liquid two-phase hole sealing device which characterized in that: the device comprises a first bag, a second bag, a third bag, a primary grouting pipe and a secondary grouting pipe, wherein the primary grouting pipe respectively penetrates through the first bag, the second bag and the third bag along the direction from the hole opening of a drilled hole to the hole bottom, the first bag is close to one side of the hole opening of the drilled hole, three first check valves arranged at intervals are arranged on the primary grouting pipe, the first bag, the second bag and the third bag are correspondingly communicated with one first check valve respectively, one end of the primary grouting pipe close to the hole opening of the drilled hole is a primary grouting inlet, and one end of the primary grouting pipe close to the hole bottom of the drilled hole is plugged;
the first bag, the second bag and the third bag are elastic bags, the first bag, the second bag and the third bag are in close contact with the wall of the drilled hole after grouting expansion, a gap between the first bag and the second bag is marked as a first hole sealing section, and a gap between the second bag and the third bag is marked as a second hole sealing section; the length of the second hole sealing section is less than one half of the length of the first hole sealing section, a blasting valve is arranged on the primary grouting pipe, and the blasting valve is positioned in the first hole sealing section;
the secondary grouting pipe penetrates through the first bag and the second bag along the direction from the hole opening of the drill hole to the bottom of the drill hole, one end of the secondary grouting pipe, which is close to the hole opening of the drill hole, is a secondary grouting inlet, and the other end of the secondary grouting pipe is positioned in the second hole sealing section and is communicated with the second hole sealing section through a second one-way valve;
the effective compression pressure of the first bag, the second bag and the third bag is 2 MPa, and the opening pressure of the first one-way valve and the second one-way valve is 0.5 MPa.
2. The solid-liquid two-phase hole sealing device for gas extraction drilling according to claim 1, wherein the device is characterized in that: the first bag and the second bag have the same structure, and holes for the primary grouting pipe, the secondary grouting pipe and the gas extraction sleeve to pass through are respectively formed in the first bag and the second bag; the third bag is provided with a hole site for the primary grouting pipe and the gas extraction sleeve to pass through; two ends of the first bag, the second bag and the third bag are respectively fixedly arranged on the primary grouting pipe through clamping rings.
3. The solid-liquid two-phase hole sealing device for gas extraction drilling according to claim 1, wherein the device is characterized in that: the explosion valve is positioned in the middle of the first hole sealing section; the opening pressure of the explosion valve is simultaneously larger than the opening pressure of the first one-way valve and the opening pressure of the second one-way valve, and the opening pressure of the explosion valve is simultaneously smaller than the effective compression pressures of the first bag, the second bag and the third bag.
4. A gas extraction borehole solid-liquid two-phase hole sealing process using the hole sealing device according to any one of claims 1 to 3, characterized in that: the method comprises the following steps:
step one, preparing work before hole sealing: the gas extraction drilling solid-liquid two-phase hole sealing device is marked as a hole sealing device, a gas extraction sleeve is connected with the hole sealing device, and the gas extraction sleeve with the hole sealing device fixed is sent into the drilling;
step two, solid-phase hole sealing is carried out on the first hole sealing section: firstly preparing a solid-phase hole sealing material by using a hole sealing material a, and then injecting the solid-phase hole sealing material into a first hole sealing section through a grouting pump and a first grouting pipe to finish solid-phase hole sealing of the first hole sealing section;
thirdly, networking extraction and periodically screening leakage extraction drilling holes: after the solid phase hole sealing of the first hole sealing section is finished, after the solid phase hole sealing material in the first hole sealing section is primarily solidified, the gas extraction sleeve is in butt joint with the gas extraction pipeline, and then gas is extracted in a networking way; periodically detecting the gas extraction concentration of the extraction drilling hole with the solid-phase hole sealing of the first hole sealing section, evaluating the attenuation degree of the gas extraction concentration, and timely finding out the gas leakage of the extraction drilling hole; if the gas extraction concentration of the extraction drilling hole is reduced to 30% or lower, liquid phase hole sealing of the second hole sealing section is needed, and if the gas extraction concentration of the extraction drilling hole is always maintained to be above 30%, liquid phase hole sealing of the second hole sealing section is not needed;
step four, carrying out liquid phase hole sealing on the second hole sealing section on the leaked extraction drilling hole: firstly preparing a liquid-phase hole sealing material by using the hole sealing material b, and then injecting the liquid-phase hole sealing material into a second hole sealing section through a grouting pump and a second grouting pipe to finish liquid-phase hole sealing of the second hole sealing section;
step five, periodically maintaining the second hole sealing section: after the liquid phase hole sealing of the second hole sealing section is finished, continuously extracting gas; and (3) carrying out periodic detection on gas extraction concentration on the extraction drilling hole subjected to liquid phase hole sealing of the second hole sealing section, timely finding out the gas leakage extraction drilling hole, and repeating the step four and the step five on the second hole sealing section of the gas leakage extraction drilling hole.
5. The solid-liquid two-phase hole sealing process for gas extraction drilling of claim 4, wherein the process is characterized by comprising the following steps of: the specific steps for preparing the solid-phase hole sealing material in the second step are as follows: filling a certain amount of water into a stirring barrel in advance, adding a hole sealing material a into the stirring barrel according to a water-material proportioning relationship of 0.8:1, starting a stirrer after the hole sealing material a is finished, and uniformly mixing slurry to obtain a solid phase hole sealing material;
the specific steps of injecting the solid phase hole sealing material in the second step are as follows: a first quick connector is used for connecting an outlet of a grouting pump with a primary grouting pipe of a hole sealing device, the grouting pump is started, and solid-phase hole sealing materials are injected into the primary grouting pipe; when the pressure of the grouting pump reaches the opening pressure of the first one-way valve, the solid-phase hole sealing material flows into and fills the first bag, the second bag and the third bag respectively; as the pressure of the grouting pump continues to rise, when the pressure of the grouting pump reaches the opening pressure of the explosion valve, the solid-phase hole sealing material flows into the first hole sealing section and begins to fill the first hole sealing section; after the first hole sealing section is filled, continuously injecting a solid phase hole sealing material, wherein the solid phase hole sealing material permeates into surrounding cracks of the wall of the drilling hole under the action of pressure; when the grouting pump pressure is rapidly increased, the grouting pump is closed, and solid-phase hole sealing of the first hole sealing section is completed.
6. The solid-liquid two-phase hole sealing process for gas extraction drilling of claim 4, wherein the process is characterized by comprising the following steps of: the preparation of the liquid phase hole sealing material in the fourth step comprises the following specific steps: filling a certain amount of water into a stirring barrel in advance, adding a hole sealing material b into the stirring barrel according to a water-material proportioning relationship of 200:1, starting a stirrer after the completion, uniformly mixing the liquid, and preparing a glue solution to obtain a liquid phase hole sealing material;
the specific steps of injecting the liquid phase hole sealing material in the fourth step are as follows: a second quick connector is used for connecting an outlet of the grouting pump with a secondary grouting pipe of the hole sealing device, the grouting pump is started, and liquid phase hole sealing materials are injected into the secondary grouting pipe; when the pressure of the grouting pump reaches the opening pressure of the second one-way valve, the liquid phase hole sealing material flows into the second hole sealing section, and the second hole sealing section starts to be filled; after the second hole sealing section is filled, continuously injecting liquid phase hole sealing materials, wherein the liquid phase hole sealing materials penetrate into surrounding cracks of the wall of the drilling hole under the action of pressure; and when the grouting pump pressure is rapidly increased, closing the grouting pump to finish liquid phase hole sealing of the second hole sealing section.
7. The solid-liquid two-phase hole sealing process for gas extraction drilling of claim 4, wherein the process is characterized by comprising the following steps of: the hole sealing material a in the second step is prepared by mixing and preparing 1250-mesh or finer superfine cement, a water reducing agent, an accelerator, an expanding agent and a modifier, wherein the superfine cement is prepared by the following steps of: water reducing agent: and (3) an expanding agent: accelerating agent: the weight ratio of the modifier is 100:0.3 to 0.7: 8-15: 0.2 to 0.5:0.2 to 0.5.
8. The solid-liquid two-phase hole sealing process for gas extraction drilling of claim 7, wherein the process is characterized by comprising the following steps of: the superfine cement comprises the following components: water reducing agent: and (3) an expanding agent: accelerating agent: the weight ratio of the modifier is as follows: 100:0.5:10:0.3:0.3.
9. the solid-liquid two-phase hole sealing process for gas extraction drilling of claim 4, wherein the process is characterized by comprising the following steps of: the hole sealing material b in the fourth step is prepared by mixing vegetable gum, a cross-linking agent, a humectant and a modifier.
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| CN115199237A (en) * | 2022-07-21 | 2022-10-18 | 山西潞安集团潞宁煤业有限责任公司 | Gas extraction hole reinforcing device and method |
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