CN115044355B - Anti-collapse drilling fluid and preparation method and application thereof - Google Patents
Anti-collapse drilling fluid and preparation method and application thereof Download PDFInfo
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- CN115044355B CN115044355B CN202210811107.9A CN202210811107A CN115044355B CN 115044355 B CN115044355 B CN 115044355B CN 202210811107 A CN202210811107 A CN 202210811107A CN 115044355 B CN115044355 B CN 115044355B
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- 238000005553 drilling Methods 0.000 title claims abstract description 147
- 239000012530 fluid Substances 0.000 title claims abstract description 139
- 238000002360 preparation method Methods 0.000 title abstract description 30
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 104
- 239000002981 blocking agent Substances 0.000 claims abstract description 47
- 239000003112 inhibitor Substances 0.000 claims abstract description 34
- 239000003245 coal Substances 0.000 claims abstract description 26
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 25
- 229910001868 water Inorganic materials 0.000 claims abstract description 25
- 239000000126 substance Substances 0.000 claims abstract description 23
- 230000001050 lubricating effect Effects 0.000 claims abstract description 16
- 230000002265 prevention Effects 0.000 claims abstract description 16
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 27
- 239000010426 asphalt Substances 0.000 claims description 25
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 claims description 24
- 229920000642 polymer Polymers 0.000 claims description 16
- 239000003638 chemical reducing agent Substances 0.000 claims description 14
- 239000000463 material Substances 0.000 claims description 13
- 238000000034 method Methods 0.000 claims description 13
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- 239000004005 microsphere Substances 0.000 claims description 12
- 239000002245 particle Substances 0.000 claims description 12
- 229920000768 polyamine Polymers 0.000 claims description 11
- TZCXTZWJZNENPQ-UHFFFAOYSA-L barium sulfate Chemical compound [Ba+2].[O-]S([O-])(=O)=O TZCXTZWJZNENPQ-UHFFFAOYSA-L 0.000 claims description 10
- 239000010428 baryte Substances 0.000 claims description 10
- 229910052601 baryte Inorganic materials 0.000 claims description 10
- 239000004368 Modified starch Substances 0.000 claims description 9
- 229920000881 Modified starch Polymers 0.000 claims description 9
- 238000005520 cutting process Methods 0.000 claims description 9
- ONCZQWJXONKSMM-UHFFFAOYSA-N dialuminum;disodium;oxygen(2-);silicon(4+);hydrate Chemical compound O.[O-2].[O-2].[O-2].[O-2].[O-2].[O-2].[O-2].[O-2].[O-2].[O-2].[O-2].[O-2].[Na+].[Na+].[Al+3].[Al+3].[Si+4].[Si+4].[Si+4].[Si+4] ONCZQWJXONKSMM-UHFFFAOYSA-N 0.000 claims description 9
- 235000019426 modified starch Nutrition 0.000 claims description 9
- 229940080314 sodium bentonite Drugs 0.000 claims description 9
- 229910000280 sodium bentonite Inorganic materials 0.000 claims description 9
- 229920001285 xanthan gum Polymers 0.000 claims description 9
- 239000000230 xanthan gum Substances 0.000 claims description 9
- 235000010493 xanthan gum Nutrition 0.000 claims description 9
- 229940082509 xanthan gum Drugs 0.000 claims description 9
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 8
- 239000000654 additive Substances 0.000 claims description 7
- 230000000996 additive effect Effects 0.000 claims description 7
- 229910000278 bentonite Inorganic materials 0.000 claims description 7
- 229940092782 bentonite Drugs 0.000 claims description 7
- 239000000440 bentonite Substances 0.000 claims description 7
- SVPXDRXYRYOSEX-UHFFFAOYSA-N bentoquatam Chemical compound O.O=[Si]=O.O=[Al]O[Al]=O SVPXDRXYRYOSEX-UHFFFAOYSA-N 0.000 claims description 7
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 claims description 6
- 229910002804 graphite Inorganic materials 0.000 claims description 6
- 238000002156 mixing Methods 0.000 claims description 6
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 5
- 239000010439 graphite Substances 0.000 claims description 5
- 229910021532 Calcite Inorganic materials 0.000 claims description 4
- 150000004676 glycans Chemical class 0.000 claims description 4
- 229920001282 polysaccharide Polymers 0.000 claims description 4
- 239000005017 polysaccharide Substances 0.000 claims description 4
- 229920005614 potassium polyacrylate Polymers 0.000 claims description 4
- 239000003002 pH adjusting agent Substances 0.000 claims description 3
- 230000008569 process Effects 0.000 claims description 3
- 229910000029 sodium carbonate Inorganic materials 0.000 claims description 3
- 229920001661 Chitosan Polymers 0.000 claims description 2
- YCIMNLLNPGFGHC-UHFFFAOYSA-N catechol Chemical group OC1=CC=CC=C1O YCIMNLLNPGFGHC-UHFFFAOYSA-N 0.000 claims description 2
- 239000000377 silicon dioxide Substances 0.000 claims description 2
- 239000011435 rock Substances 0.000 abstract description 31
- 230000005764 inhibitory process Effects 0.000 abstract description 17
- 239000000706 filtrate Substances 0.000 abstract description 12
- 230000036571 hydration Effects 0.000 abstract description 12
- 238000006703 hydration reaction Methods 0.000 abstract description 12
- 230000009545 invasion Effects 0.000 abstract description 6
- 230000002195 synergetic effect Effects 0.000 abstract description 6
- 230000000903 blocking effect Effects 0.000 abstract description 3
- 238000013329 compounding Methods 0.000 abstract description 2
- 230000000052 comparative effect Effects 0.000 description 26
- 239000002994 raw material Substances 0.000 description 17
- WCUXLLCKKVVCTQ-UHFFFAOYSA-M Potassium chloride Chemical compound [Cl-].[K+] WCUXLLCKKVVCTQ-UHFFFAOYSA-M 0.000 description 12
- 239000000047 product Substances 0.000 description 9
- 238000012360 testing method Methods 0.000 description 9
- 230000000694 effects Effects 0.000 description 7
- 239000001103 potassium chloride Substances 0.000 description 6
- 235000011164 potassium chloride Nutrition 0.000 description 6
- 230000009286 beneficial effect Effects 0.000 description 4
- 239000002131 composite material Substances 0.000 description 4
- 238000001914 filtration Methods 0.000 description 4
- 238000005461 lubrication Methods 0.000 description 4
- 238000005096 rolling process Methods 0.000 description 4
- 239000003208 petroleum Substances 0.000 description 3
- 238000011084 recovery Methods 0.000 description 3
- 239000001913 cellulose Substances 0.000 description 2
- 229920002678 cellulose Polymers 0.000 description 2
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- 238000002474 experimental method Methods 0.000 description 2
- 239000000314 lubricant Substances 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
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- 239000005543 nano-size silicon particle Substances 0.000 description 2
- 239000003921 oil Substances 0.000 description 2
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- 238000012545 processing Methods 0.000 description 2
- 235000012239 silicon dioxide Nutrition 0.000 description 2
- 239000002002 slurry Substances 0.000 description 2
- 239000004094 surface-active agent Substances 0.000 description 2
- QLZJUIZVJLSNDD-UHFFFAOYSA-N 2-(2-methylidenebutanoyloxy)ethyl 2-methylidenebutanoate Chemical compound CCC(=C)C(=O)OCCOC(=O)C(=C)CC QLZJUIZVJLSNDD-UHFFFAOYSA-N 0.000 description 1
- 101100309761 Aedes aegypti SDR-1 gene Proteins 0.000 description 1
- 229920000049 Carbon (fiber) Polymers 0.000 description 1
- 235000019738 Limestone Nutrition 0.000 description 1
- 102100038434 Neuroplastin Human genes 0.000 description 1
- 108700038050 Neuroplastin Proteins 0.000 description 1
- 239000002202 Polyethylene glycol Substances 0.000 description 1
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 239000003963 antioxidant agent Substances 0.000 description 1
- 230000003078 antioxidant effect Effects 0.000 description 1
- 239000002199 base oil Substances 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000004566 building material Substances 0.000 description 1
- CJZGTCYPCWQAJB-UHFFFAOYSA-L calcium stearate Chemical compound [Ca+2].CCCCCCCCCCCCCCCCCC([O-])=O.CCCCCCCCCCCCCCCCCC([O-])=O CJZGTCYPCWQAJB-UHFFFAOYSA-L 0.000 description 1
- 235000013539 calcium stearate Nutrition 0.000 description 1
- 239000008116 calcium stearate Substances 0.000 description 1
- 239000004917 carbon fiber Substances 0.000 description 1
- 239000004927 clay Substances 0.000 description 1
- 239000002734 clay mineral Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000003111 delayed effect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- GUJOJGAPFQRJSV-UHFFFAOYSA-N dialuminum;dioxosilane;oxygen(2-);hydrate Chemical compound O.[O-2].[O-2].[O-2].[Al+3].[Al+3].O=[Si]=O.O=[Si]=O.O=[Si]=O.O=[Si]=O GUJOJGAPFQRJSV-UHFFFAOYSA-N 0.000 description 1
- 239000002270 dispersing agent Substances 0.000 description 1
- GVGUFUZHNYFZLC-UHFFFAOYSA-N dodecyl benzenesulfonate;sodium Chemical compound [Na].CCCCCCCCCCCCOS(=O)(=O)C1=CC=CC=C1 GVGUFUZHNYFZLC-UHFFFAOYSA-N 0.000 description 1
- HDERJYVLTPVNRI-UHFFFAOYSA-N ethene;ethenyl acetate Chemical group C=C.CC(=O)OC=C HDERJYVLTPVNRI-UHFFFAOYSA-N 0.000 description 1
- 229920001038 ethylene copolymer Polymers 0.000 description 1
- 239000005042 ethylene-ethyl acrylate Substances 0.000 description 1
- 229920006244 ethylene-ethyl acrylate Polymers 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 238000000227 grinding Methods 0.000 description 1
- 238000005098 hot rolling Methods 0.000 description 1
- 230000002209 hydrophobic effect Effects 0.000 description 1
- 229910052500 inorganic mineral Inorganic materials 0.000 description 1
- 239000006028 limestone Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 1
- 239000011707 mineral Substances 0.000 description 1
- 235000010755 mineral Nutrition 0.000 description 1
- 229910052901 montmorillonite Inorganic materials 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 229920003023 plastic Polymers 0.000 description 1
- 229920000447 polyanionic polymer Polymers 0.000 description 1
- 229920001223 polyethylene glycol Polymers 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
- 229940080264 sodium dodecylbenzenesulfonate Drugs 0.000 description 1
- 238000001179 sorption measurement Methods 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
- 230000003313 weakening effect Effects 0.000 description 1
- XOOUIPVCVHRTMJ-UHFFFAOYSA-L zinc stearate Chemical compound [Zn+2].CCCCCCCCCCCCCCCCCC([O-])=O.CCCCCCCCCCCCCCCCCC([O-])=O XOOUIPVCVHRTMJ-UHFFFAOYSA-L 0.000 description 1
Classifications
-
- 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
- C09K8/02—Well-drilling compositions
- C09K8/04—Aqueous well-drilling compositions
- C09K8/14—Clay-containing compositions
- C09K8/18—Clay-containing compositions characterised by the organic compounds
- C09K8/22—Synthetic organic compounds
- C09K8/24—Polymers
-
- 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
- C09K8/02—Well-drilling compositions
- C09K8/04—Aqueous well-drilling compositions
- C09K8/14—Clay-containing compositions
- C09K8/16—Clay-containing compositions characterised by the inorganic compounds other than clay
-
- 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
- C09K8/02—Well-drilling compositions
- C09K8/04—Aqueous well-drilling compositions
- C09K8/14—Clay-containing compositions
- C09K8/18—Clay-containing compositions characterised by the organic compounds
- C09K8/20—Natural organic compounds or derivatives thereof, e.g. polysaccharides or lignin derivatives
- C09K8/206—Derivatives of other natural products, e.g. cellulose, starch, sugars
-
- 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
- C09K2208/00—Aspects relating to compositions of drilling or well treatment fluids
- C09K2208/10—Nanoparticle-containing well treatment fluids
-
- 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
- C09K2208/00—Aspects relating to compositions of drilling or well treatment fluids
- C09K2208/12—Swell inhibition, i.e. using additives to drilling or well treatment fluids for inhibiting clay or shale swelling or disintegrating
-
- 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
- C09K2208/00—Aspects relating to compositions of drilling or well treatment fluids
- C09K2208/34—Lubricant additives
Abstract
The invention provides an anti-collapse drilling fluid and a preparation method and application thereof. The collapse prevention drilling fluid comprises 90-100 parts of water, 1-3 parts of inhibitor, 7-13 parts of plugging agent and 0.1-0.3 part of wall fixing agent by weight; the blocking agent comprises a combination of an elastic blocking agent, a rigid blocking agent and a nano blocking agent. According to the collapse-preventing drilling fluid, through the compounding of the inhibitor, the blocking agent and the wall fixing agent and the combination of the elastic blocking agent, the rigid blocking agent and the nano blocking agent, the drilling fluid can effectively block micropores and microcracks of complex coal bed rocks through the multi-element synergistic effect of physical blocking, chemical cementing and hydration inhibition, the invasion of drilling fluid filtrate is reduced, the pressure-bearing capacity of a well Zhou Yandan is improved, the inhibition performance is good, and meanwhile, the well drilling fluid also has good lubricating and drag-reducing performance.
Description
Technical Field
The invention belongs to the technical field of drilling fluid, and particularly relates to anti-collapse drilling fluid and a preparation method and application thereof.
Background
In the coal bed gas or coal bed passing drilling process, due to coal rock cutting formation, structural fracture and low mechanical strength, underground complex conditions such as blocking during tripping, sticking and the like are frequently caused, the engineering progress is delayed, and even the well drilling engineering is scrapped when serious, so that great economic loss is caused.
On the one hand, the complicated coal seam is unstable due to the fact that coal and rock have the characteristics of cutting, microcrack development, loose cementation, large brittleness and the like, drilling fluid filtrate is easy to invade, so that cementing force between the coal and rock is reduced, and the coal and rock are easy to crush and collapse under the action of external force; on the other hand, due to the hydration of clay minerals in the coal rock under the influence of external fluid, the internal tension generated by the hydration damages the integrity of the coal from the inside. Therefore, the physical plugging and chemical cementing are enhanced to prevent the penetration of drilling fluid filtrate, the strength of coal and rock is improved, and meanwhile, the clay hydration is effectively inhibited, so that the method is an important technical countermeasure for improving the stability of the well wall of the complex coal seam.
For example, CN109294531a discloses a composite asphalt anti-collapse agent for water-based drilling fluids and water-based drilling fluids, the composite asphalt anti-collapse agent comprising natural asphalt, sodium dodecylbenzenesulfonate, ethylene-ethyl acrylate, surfactants, carbon fiber, zinc stearate, calcium stearate, limestone powder; the water-based drilling fluid comprises montmorillonite, water, barite, polyethylene glycol and the composite asphalt collapse prevention inhibitor. The water-based drilling fluid adopts a specific composite asphalt anti-collapse inhibitor, so that good anti-collapse and lubricating capacity can be obtained; and the preparation method is simple, convenient for production and beneficial to popularization. However, the HTHP fluid loss of the water-based drilling fluid is to be further reduced and shale expansion rates are higher.
Therefore, the anti-collapse water-based drilling fluid which can effectively seal micro-pores and micro-cracks of the rock of the complex coal seam, reduce the invasion of drilling fluid filtrate, improve the pressure bearing capacity of a well Zhou Yandan, has good inhibition performance and good lubricating and drag reducing performance is developed, and is a problem to be solved in the field.
Disclosure of Invention
Aiming at the defects existing in the prior art, the invention aims to provide an anti-collapse drilling fluid, and a preparation method and application thereof. According to the collapse-preventing drilling fluid, through the addition of the inhibitor, the plugging agent and the wall fixing agent with specific contents, the drilling fluid can effectively plug micropores and microcracks of the rock of the complex coal seam through the multi-element synergistic effect of physical plugging, chemical cementing and hydration inhibition, so that the invasion of filtrate of the drilling fluid is reduced, the pressure bearing capacity of a well Zhou Yandan is improved, the inhibition performance is good, meanwhile, the lubricating resistance reducing performance is good, and the collapse-preventing drilling fluid is suitable for the complex coal seam.
To achieve the purpose, the invention adopts the following technical scheme:
in a first aspect, the invention provides an anti-collapse drilling fluid, which comprises 90-100 parts by weight of water, 1-3 parts by weight of an inhibitor, 7-13 parts by weight of a plugging agent and 0.1-0.3 part by weight of a wall fixing agent; the blocking agent comprises a combination of an elastic blocking agent, a rigid blocking agent and a nano blocking agent.
According to the anti-collapse drilling fluid, through the combination of the inhibitor, the plugging agent and the wall fixing agent, the drilling fluid improves the plugging effect of the water-based drilling fluid on micropores and microcracks of complex coal bed rocks through the multi-element synergistic effect of physical plugging, chemical cementing and hydration inhibition, reduces the invasion of the drilling fluid filtrate, improves the pressure bearing capacity of a well Zhou Yandan, and has good inhibition performance; the hydration expansion of the complex coal seam can be further effectively inhibited and the rock expansion rate can be reduced through the synergistic effect of the plugging agent, the inhibitor and the wall fixing agent which are combined in a specific way.
Preferably, the collapse preventing drilling fluid comprises 90-100 parts by weight of water, such as 92 parts, 94 parts, 96 parts, 98 parts and the like.
Preferably, the collapse prevention drilling fluid comprises 1 to 3 parts of inhibitor, for example, 1.2 parts, 1.4 parts, 1.6 parts, 1.8 parts, 2 parts, 2.2 parts, 2.4 parts, 2.6 parts, 2.8 parts, etc., in parts by weight.
Preferably, the anti-collapse drilling fluid comprises 7 to 13 parts of plugging agent in parts by weight, for example, 7.5 parts, 8 parts, 8.5 parts, 9 parts, 9.5 parts, 10 parts, 10.5 parts, 11 parts, 11.5 parts, 12 parts, 12.5 parts and the like.
Preferably, the collapse prevention drilling fluid comprises 0.1 to 0.3 part by weight of a wall fixing agent, for example, 0.12 part by weight, 0.14 part by weight, 0.16 part by weight, 0.18 part by weight, 0.2 part by weight, 0.22 part by weight, 0.24 part by weight, 0.26 part by weight, 0.28 part by weight and the like.
In the invention, the inhibitor, the plugging agent and the wall fixing agent with specific contents are used in a matched manner, so that the plugging effect on the rock is optimal, and the hydration expansion of the rock is effectively inhibited; when the inhibitor is used in an excessive amount, it causes poor rheological properties of the drilling fluid.
Preferably, the mass ratio of the inhibitor to the plugging agent to the wall fixing agent in the collapse prevention drilling fluid is 1 (6-13) (0.1-0.3), wherein the specific value in (6-13) can be, for example, 6, 6.5, 7, 7.5, 8, 8.5, 9, 9.5, 10, 10.5, 11, 11.5, 12, 12.5 and the like; the specific values in (0.1-0.3) may be 0.12, 0.14, 0.16, 0.18, 0.2, 0.22, 0.24, 0.26, 0.28, etc.
Preferably, the inhibitor comprises potassium polyacrylate and/or polyamine.
Preferably, the blocking agent includes 3 to 5 parts by weight of an elastic blocking agent (e.g., 3 parts, 3.2 parts, 3.4 parts, 3.6 parts, 3.8 parts, 4 parts, 4.2 parts, 4.4 parts, 4.6 parts, 4.8 parts, etc.), 3 to 5 parts by weight of a rigid blocking agent (e.g., 3 parts, 3.2 parts, 3.4 parts, 3.6 parts, 3.8 parts, 4 parts, 4.2 parts, 4.4 parts, 4.6 parts, 4.8 parts, etc.), and 1 to 3 parts by weight of a nano blocking agent (e.g., 1.2 parts, 1.4 parts, 1.6 parts, 1.8 parts, 2 parts, 2.2 parts, 2.4 parts, 2.6 parts, 2.8 parts, etc.).
Preferably, the mass ratio of the elastic blocking agent to the rigid blocking agent to the nano blocking agent in the blocking agent is 1 (1-1.7) (0.2-1), wherein the specific value in (1-1.7) can be 1.1, 1.15, 1.2, 1.25, 1.3, 1.35, 1.4, 1.45, 1.5, 1.55, 1.6, 1.65, 1.7 and the like; specific values of (0.2 to 1) may be, for example, 0.22, 0.24, 0.26, 0.28, 0.3, 0.32, 0.34, 0.36, 0.38, 0.4, 0.45, 0.5, 0.55, 0.6, 0.65, 0.7, 0.75, 0.8, 0.85, 0.9, 0.95, etc., and further preferably 1 (1.5 to 1.7): 0.2 to 1.
According to the invention, the plugging agent is synergistically enhanced by the plugging agent with a specific proportion, so that the plugging effect of drilling fluid on rock is further improved, and the bearing capacity of the rock is improved.
Preferably, the elastic blocking agent comprises modified asphalt and/or elastic graphite.
Preferably, the modified asphalt comprises a sulfonated asphalt.
The particle size of the elastic blocking agent is preferably 20 to 100. Mu.m, for example, 25 μm, 30 μm, 35 μm, 40 μm, 45 μm, 50 μm, 55 μm, 60 μm, 65 μm, 70 μm, 75 μm, 80 μm, 85 μm, 90 μm, 95 μm, 100 μm, etc., and more preferably 20 to 70. Mu.m.
Preferably, the rigid blocking agent comprises calcite and/or calcium carbonate.
Preferably, the number of the rigid blocking agent is 800 to 1200 mesh, and may be 820 mesh, 840 mesh, 860 mesh, 880 mesh, 900 mesh, 920 mesh, 940 mesh, 960 mesh, 980 mesh, 1000 mesh, 1020 mesh, 1040 mesh, 1060 mesh, 1080 mesh, 1100 mesh, 1120 mesh, 1140 mesh, 1160 mesh, 1180 mesh, or the like, for example.
Preferably, the nano-plugging agent comprises polymeric microspheres and/or silica.
Preferably, the particle size of the nano blocking agent is 100 to 300nm, for example, 120nm, 140nm, 160nm, 180nm, 200nm, 220nm, 240nm, 260nm, 280nm, etc.
According to the invention, the nano plugging agent can effectively plug micropores and microcracks of the rock, and is also beneficial to weakening the capillary effect of the rock of the complex coal seam.
Preferably, the wall fixing agent comprises a chemical wall fixing agent.
Preferably, the chemical wall-fixing agent comprises a modified polysaccharide.
Preferably, the modified polysaccharide comprises chitosan containing catechol structure.
In the invention, the chemical wall fixing agent can be adsorbed on the surfaces of the well wall rock and drill cuttings to form a layer of hydrophobic film, and meanwhile, the chemical cementing effect is exerted, so that the bearing capacity of the well wall is improved.
Preferably, the collapse prevention drilling fluid further comprises 1 to 3 parts of bentonite, for example, 1.2 parts, 1.4 parts, 1.6 parts, 1.8 parts, 2 parts, 2.2 parts, 2.4 parts, 2.6 parts, 2.8 parts and the like, in terms of parts by weight.
Preferably, the bentonite comprises sodium bentonite.
Preferably, the collapse prevention drilling fluid further comprises 0.05 to 0.15 part by weight of a pH regulator, for example, 0.06 part by weight, 0.07 part by weight, 0.08 part by weight, 0.09 part by weight, 0.1 part by weight, 0.11 part by weight, 0.12 part by weight, 0.13 part by weight, 0.14 part by weight and the like.
Preferably, the pH adjuster comprises sodium carbonate and/or sodium hydroxide.
Preferably, the collapse preventing drilling fluid further comprises 15-30 parts of weighting materials, such as 16 parts, 17 parts, 18 parts, 19 parts, 20 parts, 21 parts, 22 parts, 23 parts, 24 parts, 25 parts, 26 parts, 27 parts, 28 parts, 29 parts and the like, in parts by weight.
Preferably, the weighting material comprises barite.
Preferably, the collapse prevention drilling fluid further comprises 1-2 parts of a fluid loss additive, for example, 1.2 parts, 1.4 parts, 1.6 parts, 1.8 parts and the like, in parts by weight.
Preferably, the fluid loss additive comprises a modified starch.
Preferably, the collapse prevention drilling fluid further comprises 0.05-0.2 part of tackifying and cutting agent, for example, 0.06 part, 0.08 part, 0.1 part, 0.12 part, 0.14 part, 0.16 part, 0.18 part, 0.2 part and the like in parts by weight.
Preferably, the tackifying and cutting agent comprises xanthan gum.
Preferably, the collapse preventing drilling fluid further comprises 1 to 3 parts of a lubricating drag reducer, for example, 1 part, 1.2 parts, 1.4 parts, 1.6 parts, 1.8 parts, 2 parts, 2.2 parts, 2.4 parts, 2.6 parts, 2.8 parts and the like in parts by weight.
In the invention, the lubricating drag reducer consists of a plurality of components such as base oil, a surfactant, a dispersing agent, an antioxidant and the like, can be adsorbed on the surfaces of a metal drilling tool and a well wall rock to form a compact extreme pressure micro-nano adsorption film, can remarkably reduce friction resistance, is also beneficial to reducing the circulating equivalent density (ECD) of drilling fluid, and reduces the invasion driving force of the filtrate of the drilling fluid.
In a second aspect, the present invention provides a method for preparing the anti-collapse drilling fluid according to the first aspect, the method comprising:
and mixing water, an inhibitor, a plugging agent and a wall fixing agent to obtain the collapse-preventing drilling fluid.
Preferably, the mixed material further comprises any one or a combination of at least two of bentonite, a pH regulator, a weighting material, a fluid loss additive, a viscosified cutting agent or a lubricating drag reducer.
Preferably, the rotational speed of the mixing is 5000 to 7000rpm, and may be 5200rpm, 5400rpm, 5600rpm, 5800rpm, 6000rpm, 6200rpm, 6400rpm, 6800rpm, or the like, for example.
Preferably, the mixing time is 1 to 2 hours, for example, 1 hour, 1.5 hours, 2 hours, etc.
The preparation method comprises the steps of sequentially adding bentonite, a pH regulator, a filtrate reducer, an inhibitor, a tackifying and cutting agent, an elastic plugging agent, a rigid plugging agent, a nano plugging agent, a chemical wall fixing agent and a lubricating drag reducer into water, and then adding a weighting material for weighting.
In a third aspect, the present invention provides the use of an anti-collapse drilling fluid according to the first aspect in complex coal seam drilling processes.
The numerical ranges recited herein include not only the recited point values, but also any point values between the recited numerical ranges that are not recited, and are limited to, and for the sake of brevity, the invention is not intended to be exhaustive of the specific point values that the recited range includes.
Compared with the prior art, the invention has the beneficial effects that:
according to the collapse-preventing drilling fluid, the specific content and the specific type of inhibitor, the plugging agent and the wall fixing agent are synergistic, so that micropores and microcracks of the complex coal bed rock can be effectively plugged through physical plugging and chemical cementing, the invasion of drilling fluid filtrate is reduced, the pressure bearing capacity of a well Zhou Yandan is improved, and the collapse-preventing drilling fluid has an excellent inhibition effect on hydration expansion of the rock; furthermore, the plugging effect on the coal seam and the rock bearing capacity are further improved through the elastic plugging agent, the rigid plugging agent and the nano plugging agent with specific types and contents, and the preparation method is simple and suitable for production.
Detailed Description
The technical scheme of the invention is further described by the following specific embodiments. It will be apparent to those skilled in the art that the examples are merely to aid in understanding the invention and are not to be construed as a specific limitation thereof.
In the present invention, all the materials used in the examples and comparative examples are as follows:
sodium bentonite: purchased from Weifang Hua Wei Zhi New Material science and technology Co., ltd;
sodium carbonate and sodium hydroxide: purchased from Shandong Jiuzhuang chemical Co., ltd;
modified starch: purchased from Zhonghai oilfield services Inc., cat# PF-FLTROL;
potassium polyacrylate: purchased from the major petroleum engineering company of southwest oil, sichuan, cat# FA367;
polyamine inhibitors: purchased from Shandong Shi Dachang Co., ltd., product number SDJA;
xanthan gum: purchased from Zibo Co., ltd., product number XC;
modified asphalt: purchased from Shandong Shi Dachang Co., ltd., product number FF-1;
elastic graphite: purchased from Qingdao yellow Tao graphite Co., ltd, product number JT-11;
rigid calcite particles: purchased from the mineral product processing plant, rayleigh, county, cat No. FJS;
rigid calcium carbonate particles: purchased from Shanghai county Hua silicon mining Co., ltd;
nano polymer microspheres: purchased from Shandong Shi Dachang Co., ltd., product number SDPM;
modified nano silicon dioxide: purchased from Shandong Deshun oil technologies Co., ltd., product number NS-1;
chemical wall fixing agent: purchased from Shandong Shi Dachang Co., ltd., product number SDGB;
lubrication drag reducer: purchased from Shandong Shi Dachang Co., ltd., product number SDR-1;
barite: purchased from maozhuo building materials limited, county of life.
Example 1
The embodiment provides an anti-collapse drilling fluid, which comprises, by weight, 100 parts of water, 2 parts of sodium bentonite, 0.15 part of sodium hydroxide, 1 part of modified starch, 1.5 parts of polyamine inhibitor, 0.15 part of xanthan gum, 3 parts of sulfonated asphalt, 5 parts of calcium carbonate (1200 meshes), 1.5 parts of nano polymer microspheres, 0.2 part of chemical wall fixing agent SDGB, 3 parts of lubricating drag reducer and 18.5 parts of barite.
The embodiment provides a preparation method of the collapse-preventing drilling fluid, which specifically comprises the following steps:
and under the rotating speed of 6000rpm, sequentially adding sodium bentonite, sodium hydroxide, modified starch, polyamine inhibitor, xanthan gum, sulfonated asphalt, calcium carbonate, nano polymer microspheres, chemical wall fixing agent SDGB and lubricating drag reducer into a drilling fluid slurry cup, weighting by using barite, and fully stirring to obtain the collapse-preventing drilling fluid.
Example 2
The embodiment provides an anti-collapse drilling fluid which comprises, by weight, 100 parts of water, 2 parts of sodium bentonite, 0.15 part of sodium hydroxide, 1 part of modified starch, 1.5 parts of potassium polyacrylate, 0.15 part of xanthan gum, 3 parts of elastic graphite, 5 parts of calcite, 1.5 parts of modified nano silicon dioxide, 0.2 part of chemical wall fixing agent SDGB, 3 parts of lubricating drag reducer and 18.5 parts of barite.
The embodiment provides a preparation method of the collapse-preventing drilling fluid, and the specific steps are the same as those of embodiment 1.
Example 3
The embodiment provides an anti-collapse drilling fluid, which comprises, by weight, 100 parts of water, 2 parts of sodium bentonite, 0.15 part of sodium hydroxide, 1 part of modified starch, 1.5 parts of polyamine inhibitor, 0.15 part of xanthan gum, 3 parts of elastic graphite, 5 parts of calcium carbonate (1200 meshes), 1.5 parts of nano polymer microspheres, 0.2 part of chemical wall fixing agent SDGB, 3 parts of lubricating drag reducer and 25.5 parts of barite.
The present embodiment provides a method for preparing the collapse-preventing drilling fluid, which is different from embodiment 1 only in that: weighting the system density to 1.3g/c with baritem 3 Other steps and parameters were the same as in example 1.
Example 4
The embodiment provides an anti-collapse drilling fluid, which is different from embodiment 1 only in that the total amount of the polyamine inhibitor, the plugging agent and the chemical wall fixing agent SDGB is unchanged, the mass ratio is 1:5:0.13, and other raw materials, the use amount and the proportion are the same as those of embodiment 1.
The embodiment provides a preparation method of anti-collapse drilling fluid, and specific steps are the same as those of embodiment 1.
Example 5
The embodiment provides an anti-collapse drilling fluid, which is different from embodiment 1 only in that the total amount of the polyamine inhibitor, the plugging agent and the chemical wall fixing agent SDGB is unchanged, the mass ratio is 1:6:0.05, and other raw materials, the use amount and the proportion are the same as those of embodiment 1.
The embodiment provides a preparation method of anti-collapse drilling fluid, and specific steps are the same as those of embodiment 1.
Example 6
The embodiment provides an anti-collapse drilling fluid, which is different from embodiment 1 only in that the total amount of the plugging agent is unchanged, the mass ratio of the sulfonated asphalt to the calcium carbonate to the nano polymer microspheres is 1:1:0.5, and other raw materials and the using amount are the same as those of embodiment 1.
The embodiment provides a preparation method of anti-collapse drilling fluid, and specific steps are the same as those of embodiment 1.
Example 7
The present example provides an anti-collapse drilling fluid, which differs from example 1 only in that the sulfonated asphalt in the plugging agent is replaced by white asphalt of equal weight parts, and other raw materials and the amounts are the same as in example 1.
The embodiment provides a preparation method of anti-collapse drilling fluid, and specific steps are the same as those of embodiment 1.
Example 8
The present example provides an anti-collapse drilling fluid, which is different from example 1 only in that the particle size of the sulfonated asphalt in the plugging agent is 75 μm, and other raw materials and the use amounts are the same as those in example 1.
The embodiment provides a preparation method of anti-collapse drilling fluid, and specific steps are the same as those of embodiment 1.
Example 9
The present example provides an anti-collapse drilling fluid, which is different from example 1 only in that the particle size of the sulfonated asphalt in the plugging agent is 10 μm, and other raw materials and the use amounts are the same as those in example 1.
The embodiment provides a preparation method of anti-collapse drilling fluid, and specific steps are the same as those of embodiment 1.
Example 10
The embodiment provides an anti-collapse drilling fluid, which is different from embodiment 1 only in that the mesh number of calcium carbonate in the plugging agent is 400 mesh, and other raw materials and the dosage are the same as those of embodiment 1.
The embodiment provides a preparation method of anti-collapse drilling fluid, and specific steps are the same as those of embodiment 1.
Example 11
The embodiment provides an anti-collapse drilling fluid, which is different from embodiment 1 only in that the mesh number of calcium carbonate in the plugging agent is 1500 mesh, and other raw materials and the dosage are the same as those of embodiment 1.
The embodiment provides a preparation method of anti-collapse drilling fluid, and specific steps are the same as those of embodiment 1.
Example 12
This example provides an anti-collapse drilling fluid, which differs from example 1 only in that the nano-polymer microspheres are replaced by vinyl acetate-ethylene copolymer emulsion with the same particle size, and other raw materials and the same amount are used as in example 1.
The embodiment provides a preparation method of anti-collapse drilling fluid, and specific steps are the same as those of embodiment 1.
Example 13
The embodiment provides an anti-collapse drilling fluid, which is different from embodiment 1 only in that the chemical wall fixing agent is replaced by aluminum humate, and other raw materials and the using amount are the same as those of embodiment 1.
The embodiment provides a preparation method of anti-collapse drilling fluid, and specific steps are the same as those of embodiment 1.
Comparative example 1
This comparative example provides a KCl/polymer water-based drilling fluid comprising, in parts by weight, 100 parts of water, 2 parts of sodium bentonite, 0.3 part of sodium hydroxide, 0.3 part of polyanionic cellulose, 1 part of modified starch filtrate reducer, 1.5 parts of polyamine inhibitor, 0.15 part of xanthan gum, 12 parts of modified asphalt, 8 parts of potassium chloride, 3 parts of lubricant and 21.5 parts of barite.
The comparative example provides a preparation method of KCl/polymer water-based drilling fluid, which specifically comprises the following steps:
and under the rotating speed of 6000rpm, sequentially adding sodium bentonite, sodium hydroxide, polyanion cellulose, modified starch filtrate reducer, polyamine inhibitor, xanthan gum, modified asphalt, potassium chloride and lubricant into a drilling fluid slurry cup, and weighting with barite to obtain the KCl/polymer water-based drilling fluid.
Comparative example 2
This comparative example provides an anti-collapse drilling fluid which differs from example 1 only in that the polyamine inhibitor is present in 0.5 parts, and other materials, amounts and methods of preparation are the same as in example 1.
Comparative example 3
The comparative example provides an anti-collapse drilling fluid, which is different from the embodiment 1 only in that the proportion of each component of the plugging agent is unchanged, the total amount is 5 parts, and other raw materials, the use amount and the preparation method are the same as those of the embodiment 1.
Comparative example 4
The comparative example provides an anti-collapse drilling fluid, which is different from the embodiment 1 only in that the proportion of each component of the plugging agent is unchanged, the total amount is 20 parts, and other raw materials, the use amount and the preparation method are the same as those of the embodiment 1.
Comparative example 5
The comparative example provides an anti-collapse drilling fluid, which is different from the drilling fluid in the embodiment 1 only in that the part of the wall fixing agent is 0.05 part, and other raw materials, the using amount and the preparation method are the same as those in the embodiment 1.
Comparative example 6
The comparative example provides an anti-collapse drilling fluid, which is different from the drilling fluid in the embodiment 1 only in that the part of the wall fixing agent is 0.6 part, and other raw materials, the using amount and the preparation method are the same as those in the embodiment 1.
Comparative example 7
This comparative example provides an anti-collapse drilling fluid which differs from example 1 only in that the plugging agent has no sulfonated asphalt, the total amount of the plugging agent is unchanged, the ratio of calcium carbonate to the nano polymer microspheres is unchanged, and other raw materials, amounts and preparation methods are the same as in example 1.
Comparative example 8
This comparative example provides an anti-collapse drilling fluid which differs from example 1 only in that no calcium carbonate is contained in the plugging agent, the total amount of the plugging agent is unchanged, the ratio of the sulfonated asphalt to the nano polymer microspheres is unchanged, and other raw materials, the use amount and the preparation method are the same as those of example 1.
Comparative example 9
The comparative example provides an anti-collapse drilling fluid, which is different from the embodiment 1 only in that no nano polymer microsphere exists in the plugging agent, the total amount of the plugging agent is unchanged, the ratio of calcium carbonate to sulfonated asphalt is unchanged, and other raw materials, the dosage and the preparation method are the same as those of the embodiment 1.
Comparative example 10
This comparative example provides an anti-collapse drilling fluid which differs from example 1 only in that the total amount of plugging agent is unchanged, only sulfonated asphalt is used, and other materials, amounts and preparation methods are the same as in example 1.
Performance testing
The drilling fluids provided in examples 1-13 and comparative examples 1-10 were thermally rolled for 16h at 120 ℃ to measure the rheological properties, fluid loss properties, lubricity and inhibition properties before and after the thermal rolling;
(1) Apparent Viscosity (AV), plastic Viscosity (PV) and dynamic shear force (YP): on-site testing of drilling fluids for the petroleum and gas industry using GB/T16783 part 1: testing by a testing method of rheological property in the water-based drilling fluid;
(2) API Fluid Loss (FL) API ) And HTHP Fluid Loss (FL) HTHP ): using GB/T16783 petroleum and gas industry drilling fluid field test part 1: a method for testing the filtration loss in water-based drilling fluid;
(3) Lubrication coefficient: testing by adopting a FANN drilling fluid E-P extreme pressure lubrication instrument;
(4) Rock debris rolling recovery rate and core expansion rate: processing a complex coal bed rock sample into 5-10 mesh particles for rock debris rolling dispersion recovery rate experiments, grinding the rock debris, pressing the rock debris into a core through a 100 mesh sieve for expansion rate test experiments, and evaluating the inhibition performance of drilling fluid; the shale inhibition evaluation method is tested by adopting NB/T10121-2018 drilling fluid.
The specific test results are shown in table 1:
TABLE 1
As can be seen from the table, the collapse-preventing drilling fluid provided by the invention can effectively block micropores and microcracks of complex coal bed rock through the multi-element synergistic effect of physical blocking, chemical cementing and hydration inhibition by compounding the inhibitor, the blocking agent and the wall fixing agent and adopting the combination of the elastic blocking agent, the rigid blocking agent and the nano blocking agent as the blocking agent, so that the penetration of drilling fluid filtrate is reduced, the pressure bearing capacity of a well Zhou Yandan is improved, the inhibition performance is better, and meanwhile, the lubricating resistance is better.
From examples 1 to 3, the anti-collapse drilling fluid has moderate viscosity, API (application program interface) filtration loss after hot rolling of 2 to 2.8mL, HTHP filtration loss of 7.2 to 7.8mL, lubrication coefficient of 0.1206 to 0.1236, rock debris rolling recovery rate of 95.23 to 95.37 percent, core expansion rate of 7.38 to 8.09 percent, and can effectively inhibit hydration expansion of rock.
As is clear from comparison of examples 1 and 4 and 5, the inhibitor, the plugging agent and the wall fixing agent are not in a specific range, the fluid loss of the drilling fluid is increased, the plugging performance is deteriorated, and a compact plugging layer cannot be formed; as is clear from comparison between example 1 and example 6, when the elastic plugging agent, the rigid plugging agent and the nano plugging agent in the plugging agent are not in the specific range, the filtration loss of the drilling fluid is increased, the plugging performance is deteriorated, and a compact plugging layer cannot be formed; as is clear from comparison of examples 1 and examples 7 to 9, when the elastic plugging agent is not of a specific type and particle diameter, the drilling fluid loss increases, the plugging performance deteriorates, and a dense plugging layer cannot be formed; as is clear from comparison of examples 1 and 10 to 11, when the number of the rigid plugging agent is not specific, the fluid loss of the drilling fluid is increased, the plugging performance is deteriorated, and a dense plugging layer cannot be formed; as can be seen from a comparison of example 1 and example 12, the drilling fluid loss wall-forming property and the inhibition performance are deteriorated after the polymer microspheres are replaced by the polymer emulsion; as is clear from a comparison of example 1 and example 13, the chemical wall-fixing agent SDGB was replaced with another chemical wall-fixing agent, and the drilling fluid loss wall-forming property and the inhibition performance were deteriorated.
As can be seen from the comparison of examples 1-3 and comparative example 1, the anti-collapse drilling fluid provided by the invention has various performances superior to KCl/polymer water-based drilling fluid; as is clear from the comparison between the example 1 and the comparative examples 2 to 6, when the inhibitor, the plugging agent or the wall fixing agent is not in the specific range, the wall forming property and the inhibition performance of the drilling fluid are poor, and particularly when the content of the wall fixing agent is too high, the viscosity of the drilling fluid is serious; as is clear from a comparison of example 1 and comparative examples 7 to 10, the plugging agent is not specifically compounded with the inhibitor and the wall fixing agent, and the drilling fluid loss wall forming property and the inhibition performance are deteriorated.
In conclusion, the anti-collapse drilling fluid provided by the invention is compounded by the inhibitor, the plugging agent and the wall fixing agent with specific content and types, so that the viscosity and the shear force of the drilling fluid are moderate, the fluid loss is low, the hydration expansion of rock is effectively inhibited, the lubricating drag reduction and the dispersion performance are good, and the stability of the well wall of a complex coal seam can be improved.
While the foregoing is directed to embodiments of the present invention, other and further details of the invention may be had by the present invention, it should be understood that the foregoing description is merely illustrative of the present invention and that no limitations are intended to the scope of the invention, except insofar as modifications, equivalents, improvements or modifications are within the spirit and principles of the invention.
Claims (26)
1. The anti-collapse drilling fluid for the complex coal seam is characterized by comprising, by weight, 90-100 parts of water, 1-3 parts of an inhibitor, 7-13 parts of a plugging agent and 0.1-0.3 part of a wall fixing agent;
the blocking agent comprises a combination of an elastic blocking agent, a rigid blocking agent and a nano blocking agent;
the mass ratio of the inhibitor to the plugging agent to the wall fixing agent in the collapse-preventing drilling fluid is 1 (6-13) (0.1-0.3);
the elastic plugging agent comprises modified asphalt or elastic graphite;
the modified asphalt is sulfonated asphalt;
the rigid blocking agent comprises calcite or calcium carbonate;
the wall fixing agent comprises a chemical wall fixing agent;
the chemical wall fixing agent comprises modified polysaccharide;
the modified polysaccharide comprises chitosan containing catechol structure.
2. The collapse preventing drilling fluid according to claim 1, wherein the inhibitor comprises potassium polyacrylate and/or polyamine.
3. The collapse preventing drilling fluid according to claim 1, wherein the blocking agent comprises 3 to 5 parts by weight of an elastic blocking agent, 3 to 5 parts by weight of a rigid blocking agent, and 1 to 3 parts by weight of a nano blocking agent.
4. The collapse prevention drilling fluid according to claim 1, wherein the mass ratio of the elastic blocking agent to the rigid blocking agent to the nano blocking agent in the blocking agent is 1 (1-1.7): 0.2-1.
5. The anti-collapse drilling fluid according to claim 4, wherein the mass ratio of the elastic blocking agent to the rigid blocking agent to the nano blocking agent in the blocking agent is 1 (1.5-1.7): 0.2-1.
6. The collapse prevention drilling fluid according to claim 1, wherein the particle size of the elastic plugging agent is 20-100 μm.
7. The collapse prevention drilling fluid of claim 6, wherein the particle size of the elastic plugging agent is 20-70 μm.
8. The collapse preventing drilling fluid according to claim 1, wherein the mesh number of the rigid plugging agent is 800-1200 mesh.
9. The collapse preventing drilling fluid according to claim 1, wherein the nano plugging agent comprises polymer microspheres and/or silica.
10. The collapse prevention drilling fluid according to claim 1, wherein the particle size of the nano plugging agent is 100-300 nm.
11. The collapse preventing drilling fluid according to claim 1, further comprising 1 to 3 parts of bentonite.
12. The collapse prevention drilling fluid of claim 11, wherein the bentonite comprises sodium bentonite.
13. The collapse preventing drilling fluid according to claim 1, further comprising 0.05 to 0.15 parts of a pH adjustor.
14. The collapse preventing drilling fluid of claim 13, wherein the pH adjuster comprises sodium carbonate and/or sodium hydroxide.
15. The collapse preventing drilling fluid according to claim 1, further comprising 15 to 30 parts by weight of a weighting material.
16. The collapse prevention drilling fluid of claim 15, wherein the weighting material comprises barite.
17. The collapse preventing drilling fluid according to claim 1, further comprising 1 to 2 parts by weight of a fluid loss additive.
18. The collapse preventing drilling fluid of claim 17, wherein the fluid loss additive comprises modified starch.
19. The collapse preventing drilling fluid according to claim 1, further comprising 0.05 to 0.2 parts by weight of a tackifying and cutting agent.
20. The collapse prevention drilling fluid of claim 19, wherein the viscosified shear agent comprises xanthan gum.
21. The collapse preventing drilling fluid according to claim 1, further comprising 1 to 3 parts by weight of a lubricating drag reducer.
22. A method of preparing an anti-collapse drilling fluid according to any one of claims 1 to 21, comprising:
and mixing water, an inhibitor, a plugging agent and a wall fixing agent to obtain the collapse-preventing drilling fluid.
23. The method of claim 22, wherein the mixed material further comprises any one or a combination of at least two of bentonite, pH adjuster, weighting material, fluid loss additive, viscosified cutting additive, or lubricating drag reducer.
24. The method of claim 22, wherein the rotational speed of the mixing is 5000-7000 rpm.
25. The method of claim 22, wherein the mixing is for a period of 1 to 2 hours.
26. Use of an anti-collapse drilling fluid according to any one of claims 1 to 21 in a complex coal seam drilling process.
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