CN112250369A - Crack plugging consolidation agent, preparation method and crack plugging method - Google Patents
Crack plugging consolidation agent, preparation method and crack plugging method Download PDFInfo
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- CN112250369A CN112250369A CN202010995754.0A CN202010995754A CN112250369A CN 112250369 A CN112250369 A CN 112250369A CN 202010995754 A CN202010995754 A CN 202010995754A CN 112250369 A CN112250369 A CN 112250369A
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- 238000007596 consolidation process Methods 0.000 title claims abstract description 35
- 238000000034 method Methods 0.000 title claims abstract description 16
- 238000002360 preparation method Methods 0.000 title claims abstract description 15
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 70
- 239000004568 cement Substances 0.000 claims abstract description 58
- 239000002002 slurry Substances 0.000 claims abstract description 27
- 239000003129 oil well Substances 0.000 claims abstract description 26
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 15
- 239000011863 silicon-based powder Substances 0.000 claims abstract description 11
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims abstract description 10
- 239000002994 raw material Substances 0.000 claims abstract description 6
- 239000003245 coal Substances 0.000 claims description 29
- 239000002245 particle Substances 0.000 claims description 18
- 239000007789 gas Substances 0.000 claims description 14
- 229910021487 silica fume Inorganic materials 0.000 claims description 12
- 238000002156 mixing Methods 0.000 claims description 11
- 238000005553 drilling Methods 0.000 claims description 7
- 239000011268 mixed slurry Substances 0.000 claims description 4
- 238000007789 sealing Methods 0.000 claims 2
- 238000004519 manufacturing process Methods 0.000 abstract description 7
- 230000000694 effects Effects 0.000 abstract description 3
- 238000010276 construction Methods 0.000 description 7
- 238000005260 corrosion Methods 0.000 description 4
- 230000007797 corrosion Effects 0.000 description 4
- 239000012530 fluid Substances 0.000 description 4
- 239000000843 powder Substances 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 238000003756 stirring Methods 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- 230000009466 transformation Effects 0.000 description 3
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 2
- 230000015271 coagulation Effects 0.000 description 2
- 238000005345 coagulation Methods 0.000 description 2
- 238000002347 injection Methods 0.000 description 2
- 239000007924 injection Substances 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
- 238000005192 partition Methods 0.000 description 2
- 230000035699 permeability Effects 0.000 description 2
- 239000011148 porous material Substances 0.000 description 2
- 238000005086 pumping Methods 0.000 description 2
- 239000007790 solid phase Substances 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- 239000011593 sulfur Substances 0.000 description 2
- 229910052717 sulfur Inorganic materials 0.000 description 2
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 description 1
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 230000003628 erosive effect Effects 0.000 description 1
- 238000001125 extrusion Methods 0.000 description 1
- 238000005755 formation reaction Methods 0.000 description 1
- 239000008398 formation water Substances 0.000 description 1
- 239000003517 fume Substances 0.000 description 1
- 230000036571 hydration Effects 0.000 description 1
- 238000006703 hydration reaction Methods 0.000 description 1
- 239000000395 magnesium oxide Substances 0.000 description 1
- CPLXHLVBOLITMK-UHFFFAOYSA-N magnesium oxide Inorganic materials [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 description 1
- AXZKOIWUVFPNLO-UHFFFAOYSA-N magnesium;oxygen(2-) Chemical compound [O-2].[Mg+2] AXZKOIWUVFPNLO-UHFFFAOYSA-N 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000003921 oil Substances 0.000 description 1
- 230000000704 physical effect Effects 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 239000011435 rock Substances 0.000 description 1
- 238000005204 segregation Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 238000007711 solidification Methods 0.000 description 1
- 230000008023 solidification Effects 0.000 description 1
- 239000004575 stone Substances 0.000 description 1
- 230000001131 transforming effect Effects 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
- C04B28/02—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing hydraulic cements other than calcium sulfates
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K8/00—Compositions for drilling of boreholes or wells; Compositions for treating boreholes or wells, e.g. for completion or for remedial operations
- C09K8/42—Compositions for cementing, e.g. for cementing casings into boreholes; Compositions for plugging, e.g. for killing wells
- C09K8/46—Compositions for cementing, e.g. for cementing casings into boreholes; Compositions for plugging, e.g. for killing wells containing inorganic binders, e.g. Portland cement
- C09K8/467—Compositions for cementing, e.g. for cementing casings into boreholes; Compositions for plugging, e.g. for killing wells containing inorganic binders, e.g. Portland cement containing additives for specific purposes
-
- 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
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/00474—Uses not provided for elsewhere in C04B2111/00
- C04B2111/00724—Uses not provided for elsewhere in C04B2111/00 in mining operations, e.g. for backfilling; in making tunnels or galleries
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geology (AREA)
- Inorganic Chemistry (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Ceramic Engineering (AREA)
- Mining & Mineral Resources (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- Geochemistry & Mineralogy (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Physics & Mathematics (AREA)
- Structural Engineering (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
The invention discloses a fracture plugging consolidation agent, a preparation method and a fracture plugging method, wherein the consolidation agent comprises the following raw material components in percentage by mass: 76-82% of oil well cement, 8-12% of superfine cement, 5-8% of micro silicon powder and 4-8% of micron-sized plugging agent. The consolidation agent is mixed with water to prepare plugging slurry, and then the plugging slurry is injected into a well section to be plugged, and the plugging slurry can be extruded into a micro crack from a large crack to be consolidated and solidified to form a high-strength plugging band. The crack plugging consolidation agent has the advantages of low production cost and good crack plugging effect.
Description
Technical Field
The invention relates to the technical field of coal bed methane development, in particular to a crack plugging consolidation agent, a preparation method and a crack plugging method.
Background
The coal is a porous medium which is formed by transforming plant remains through complex biological, geochemical and physicochemical actions, has a developed cleat-crack pore system and has strong coal bed heterogeneity. The production of coal bed gas is a drainage and depressurization process, and the fracturing operation needs to be carried out on the coal bed, but the phenomenon of fracturing and layer crossing is easy to occur in the fracturing, so that the problems of limited fracture extension, insufficient reservoir transformation and the like are caused. In the production process, the part of the well has limited coal seam reconstruction and small production potential, and after a period of production, the gas production rate is greatly reduced or no gas is produced.
In order to improve the single well yield of the coal bed gas well, a coal bed repeated fracturing transformation process is needed, but the problems of serious coal bed leakage, pushing of fracturing fluid and propping agent along the original cracks and the like exist in repeated fracturing, so that the transformation purpose of coal bed re-fracturing cannot be well achieved, the treatment effect of an inefficient well is not obvious, and the requirement of comprehensive treatment of the inefficient well cannot be met.
Disclosure of Invention
In view of the above problems, the present invention provides a fracture plugging consolidation agent, a preparation method thereof and a fracture plugging method, so as to solve or partially solve the above problems.
In order to achieve the purpose, the technical scheme of the invention is realized as follows:
the invention provides a crack plugging consolidation agent, which comprises the following raw material components in percentage by mass: 76-82% of oil well cement, 8-12% of superfine cement, 5-8% of micro silicon powder and 4-8% of micron-sized plugging agent.
Preferably, the oil well cement is a grade G oil well cement.
Preferably, the micro silicon powder is used for well cementation and has a particle size within 0.45 μm.
Preferably, the micron-sized plugging agent is a plugging agent while drilling.
Preferably, the particle size of the superfine cement is in the range of 0.2-20 μm.
In another aspect of the invention, a preparation method of the crack plugging consolidation agent is disclosed, and the preparation method comprises the following steps:
according to the mass percentage, 76-82% of oil well cement, 8-12% of superfine cement, 5-8% of micro silicon powder and 4-8% of micron-sized plugging agent are mixed and stirred uniformly to prepare the consolidation agent.
Preferably, the oil well cement is G-grade oil well cement.
Preferably, the micro silicon powder for well cementation is selected, and the particle size is within 0.45 μm; the micron-sized plugging agent is a plugging agent while drilling; the particle size range of the superfine cement is controlled to be 0.2-20 mu m.
In another aspect of the invention, a method for plugging a coal bed gas well fracture is disclosed, which comprises the following steps: the solidifying agent is mixed with water according to a preset proportion for use, the slurry obtained by mixing is injected into a shaft for plugging shaft cracks, and the mixing mass ratio of the mixing water to the solidifying agent is 0.4-0.5.
Preferably, the method further comprises: and injecting the mixed slurry into the shaft, and after waiting for preset setting time until the shaft reaches the preset pressure, re-fracturing the coal-bed gas well to form new fractures.
In conclusion, the beneficial effects of the invention are as follows:
the crack plugging consolidation agent is mixed with water and then injected into a shaft, a basic framework can be established in a leakage stratum, and solid-phase particles in the crack plugging consolidation agent can be filled on the framework to form a plugging partition wall, so that slurry leakage is prevented, firm plugging is quickly formed, the bearing capacity of the easily-leaked stratum is improved, and the plugging requirement of a low-pressure easily-leaked coal bed is met. The crack plugging consolidation agent has the advantages of low production cost and good crack plugging effect.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be described in detail and fully below with reference to specific embodiments of the present invention. It is to be understood that the described embodiments are merely exemplary of the invention, and not restrictive of the full scope of the invention. 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.
Example 1
The invention provides a fracture plugging consolidation agent in one embodiment, which comprises the following raw material components in percentage by mass: 76-82% of oil well cement, 8-12% of superfine cement, 5-8% of micro silicon powder and 4-8% of micron-sized plugging agent. The consolidation agent is mixed with water to prepare plugging slurry, and then the plugging slurry is injected into a well section to be plugged, and the plugging slurry can be extruded into a micro crack from a large crack to be consolidated and solidified to form a high-strength plugging band.
Among the raw materials of the fracture plugging consolidation agent, the oil well cement mainly has the function of cementing and plugging rock strata around the fracture. The superfine cement is a high-performance superfine particle cement-based grouting material, and has good permeability and pourability similar to those of organic chemical grouting liquid, higher strength and durability and environmental protection. And the superfine cement is cheaper than organic chemical grouting liquid, cannot age after grouting and has high economical efficiency. The silica fume can fill the pores among cement particles, and simultaneously generates gel with hydration products and reacts with alkaline material magnesium oxide to generate gel. In the embodiment, a proper amount of micro silica fume is added into the cement, so that the compression resistance, the bending resistance, the seepage resistance, the corrosion resistance, the impact resistance and the wear resistance of the cement can be obviously improved. The micron-sized plugging agent has micron-sized particle size, and can realize plugging of microcracks.
In conclusion, the fracture plugging consolidation agent in the embodiment is mixed with water to prepare plugging slurry, and then the plugging slurry is injected into a shaft, so that a basic framework can be established in a leakage stratum, oil well cement and superfine cement solid-phase particles in the consolidation agent are filled on the formed network framework, and a plugging partition wall is further formed, thereby preventing the leakage of the plugging slurry, quickly forming firm plugging, improving the bearing capacity of the easily-leaked stratum, and meeting the plugging requirement of a low-pressure easily-leaked coal bed. In addition, after the fracture plugging consolidation agent in the embodiment is used for plugging the fracture in the coal seam, when the coal seam is re-fractured, a new fracture can be formed in the coal seam, and the aim of re-fracturing is further achieved.
Preferably, the well cement is a grade G well cement. The G-level oil well cement is divided into a Medium Sulfur Resistance (MSR) type and a High Sulfur Resistance (HSR) type, is suitable for oil and gas-solid well engineering from the ground to 3500 meters and deeper wells, and has good chemical and physical properties. The G-level oil well cement can be mixed with various additives for use, under the conditions of well cementation temperature and pressure, the prepared cement paste has good pumpability, can quickly realize coagulation and can reach equivalent strength in a short period of time in the well injection process, and the hardened cement stone has good stability and impermeability and enough corrosion resistance to erosive media in formation water.
Preferably, the silica fume is silica fume for well cementation, and the particle size is within 0.45 μm. In the embodiment, the silica fume for well cementation can improve the strength of the set cement and the permeability resistance of cement slurry, and has the functions of water retention, segregation prevention and pumping resistance reduction. And the service life of the gas well or the oil well can be obviously prolonged, particularly under severe environments such as chloride pollution corrosion, sulfate corrosion, high humidity and the like.
Preferably, the micron-sized plugging agent is a plugging agent while drilling. The plugging agent while drilling can effectively plug lost formations with different properties and quickly and effectively plug cracks.
Preferably, the particle size range of the superfine cement is 0.2-20 mu m, and the superfine cement with the particle size can flow into the micro-cracks to realize plugging.
Example 2
The embodiment of the invention discloses a preparation method of a crack plugging consolidation agent, which comprises the following steps:
according to the mass percentage, 76-82% of oil well cement, 8-12% of superfine cement, 5-8% of micro silicon powder and 4-8% of micron-sized plugging agent are mixed and stirred uniformly to prepare the consolidation agent. Wherein, the raw materials can be put into a stirrer or a stirring vehicle according to the proportion for stirring.
Preferably, the oil well cement is G-grade oil well cement.
Preferably, the micro silicon powder for well cementation is selected, and the particle size is within 0.45 μm; the micron-sized plugging agent is selected from a plugging agent while drilling; the particle size range of the superfine cement is controlled to be 0.2-20 mu m.
In one embodiment, the consolidation agent is prepared by uniformly mixing and stirring 76% of oil well cement, 12% of superfine cement, 8% of micro-silica powder and 4% of micron-sized plugging agent.
In one embodiment, 79% of oil well cement, 9% of superfine cement, 7% of micro-silica powder and 5% of micron-sized plugging agent are mixed and stirred uniformly to prepare the consolidation agent.
In one embodiment, 82% of oil well cement, 8% of superfine cement, 5% of micro-silica powder and 8% of micron-sized plugging agent are mixed and stirred uniformly to prepare the consolidation agent.
Example 3
The embodiment of the invention discloses a method for plugging a coal-bed gas well crack, which comprises the following steps: and mixing the consolidating agent with water according to a preset proportion for use, injecting the mixed slurry into a shaft for plugging shaft cracks, wherein the mixing mass ratio of the water for mixing to the consolidating agent is 0.4-0.5. The mixing mode of the consolidation agent and water can be various, for example, the consolidation agent and water can be mixed in a workshop to obtain plugging slurry, and then the plugging slurry is poured into a construction wellhead through a construction vehicle to inject the slurry. In order to improve the success rate of the construction of the crack plugging site, the plugging slurry can be continuously extruded and injected in the construction site by using a well cementation pump truck while preparing, so that the time from the preparation of the plugging slurry to the extrusion into the coal bed is reduced, the volume and the quality of the extruded plugging slurry into the coal bed after solidification are improved, and the success rate of the crack plugging is improved.
In one embodiment, 79% of grade oil well cement, 9% of superfine cement, 7% of micro-silicon powder and 5% of micron-sized plugging agent are uniformly stirred and mixed to prepare a consolidation agent, then a well cementation pump truck is utilized to prepare plugging slurry, the water-cement ratio (the mass of water/the mass of the consolidation agent) during slurry preparation is 0.48, the plugging slurry is injected into a well section to be plugged in a pumping mode, and 7.7m of the plugging slurry is shared3The average density of the plugging slurry is 1.88g/cm3. After the slurry injection is completed, the cement is cured for 72 hours, and then the well bore is drilled. The pressure is measured and tested at 10MPa, and the pressure is reduced to 0 after the pressure is stabilized for 30min, so that the subsequent construction requirements are met.
Preferably, the method further comprises: and injecting the mixed slurry into the shaft, and after waiting for preset setting time until the shaft reaches the preset pressure, re-fracturing the coal-bed gas well to form new fractures.
The method for plugging the coal bed gas well crack specifically comprises the following steps:
step 1, in a shaft preparation stage, pulling out an original well pipe column, cleaning a shaft and ensuring the smoothness of the shaft.
And 2, performing water squeezing, and determining the using amount of the plugging slurry according to the water absorption capacity of the coal bed.
And 3, sequentially injecting plugging pad fluid, plugging slurry and displacing fluid into the shaft through the ash squeezing pipe, and plugging the cracks in the coal bed within a preset time of waiting for coagulation under pressure.
And 4, after the cracks are plugged, perforating the coal seam along the direction of the maximum main stress by using the plugged coal seam or a perforating section of a new coal preparation layer.
And 5, re-fracturing the plugged coal seam to form a new fracture network.
In conclusion, the method for plugging the coal-bed gas well cracks can form a new crack network when the coal bed is repeatedly fractured, effectively prevents the coal bed from being leaked and the fracturing fluid and the propping agent from being pushed along the original cracks, improves the fracturing construction efficiency and increases the coal bed reconstruction volume, and has the advantages of short construction period, low cost and high efficiency.
While the foregoing is directed to embodiments of the present invention, other modifications and variations of the present invention may be devised by those skilled in the art in light of the above teachings. It should be understood by those skilled in the art that the foregoing detailed description is for the purpose of better explaining the present invention, and the scope of the present invention should be determined by the scope of the appended claims.
Claims (10)
1. The crack plugging consolidation agent is characterized by comprising the following raw material components in percentage by mass: 76-82% of oil well cement, 8-12% of superfine cement, 5-8% of micro silicon powder and 4-8% of micron-sized plugging agent.
2. The consolidating agent of claim 1, wherein the oil well cement is a grade G oil well cement.
3. The consolidation agent according to claim 1, wherein the silica fume is silica fume for well cementation, and the particle size is within 0.45 μm.
4. The consolidation agent of claim 1, wherein the micron-sized plugging agent is a plugging agent while drilling.
5. The consolidating agent of claim 1, wherein the particle size of the ultra-fine cement is in the range of 0.2 to 20 μm.
6. The preparation method of the fracture plugging consolidation agent is characterized by comprising the following steps:
according to the mass percentage, 76-82% of oil well cement, 8-12% of superfine cement, 5-8% of micro silicon powder and 4-8% of micron-sized plugging agent are mixed and stirred uniformly to prepare the consolidation agent.
7. The preparation method of the crack sealing consolidation agent as claimed in claim 6, wherein the oil well cement is G-grade oil well cement.
8. The preparation method of the crack sealing and consolidating agent according to claim 6, wherein the silica fume is selected from silica fume for well cementation, and the particle size is within 0.45 μm; the micron-sized plugging agent is a plugging agent while drilling; the particle size range of the superfine cement is controlled to be 0.2-20 mu m.
9. A method for plugging a fracture of a coal-bed gas well is characterized by comprising the following steps: the consolidating agent of any one of claims 1 to 5 is mixed with water according to a preset proportion for use, the slurry obtained by mixing is injected into a shaft for plugging shaft cracks, and the mixing mass ratio of the mixing water to the consolidating agent is 0.4-0.5.
10. The method of coal bed gas well fracture plugging according to claim 9, further comprising: and injecting the mixed slurry into the shaft, and after waiting for preset setting time until the shaft reaches the preset pressure, re-fracturing the coal-bed gas well to form new fractures.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010995754.0A CN112250369A (en) | 2020-09-21 | 2020-09-21 | Crack plugging consolidation agent, preparation method and crack plugging method |
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| CN202010995754.0A CN112250369A (en) | 2020-09-21 | 2020-09-21 | Crack plugging consolidation agent, preparation method and crack plugging method |
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| CN202010995754.0A Pending CN112250369A (en) | 2020-09-21 | 2020-09-21 | Crack plugging consolidation agent, preparation method and crack plugging method |
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|---|---|---|---|---|
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