CN116042194A - Environment-friendly water-based drilling fluid and application thereof - Google Patents
Environment-friendly water-based drilling fluid and application thereof Download PDFInfo
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- CN116042194A CN116042194A CN202211400993.2A CN202211400993A CN116042194A CN 116042194 A CN116042194 A CN 116042194A CN 202211400993 A CN202211400993 A CN 202211400993A CN 116042194 A CN116042194 A CN 116042194A
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- drilling fluid
- based drilling
- friendly water
- starch
- environmentally friendly
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- 238000005553 drilling Methods 0.000 title claims abstract description 58
- 239000012530 fluid Substances 0.000 title claims abstract description 51
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 43
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims abstract description 36
- 229920000881 Modified starch Polymers 0.000 claims abstract description 26
- 239000004368 Modified starch Substances 0.000 claims abstract description 26
- 235000019426 modified starch Nutrition 0.000 claims abstract description 26
- 239000003607 modifier Substances 0.000 claims abstract description 25
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 claims abstract description 18
- 239000000706 filtrate Substances 0.000 claims abstract description 18
- 239000000440 bentonite Substances 0.000 claims abstract description 17
- 229910000278 bentonite Inorganic materials 0.000 claims abstract description 17
- SVPXDRXYRYOSEX-UHFFFAOYSA-N bentoquatam Chemical compound O.O=[Si]=O.O=[Al]O[Al]=O SVPXDRXYRYOSEX-UHFFFAOYSA-N 0.000 claims abstract description 17
- 239000003638 chemical reducing agent Substances 0.000 claims abstract description 16
- GQOKIYDTHHZSCJ-UHFFFAOYSA-M dimethyl-bis(prop-2-enyl)azanium;chloride Chemical compound [Cl-].C=CC[N+](C)(C)CC=C GQOKIYDTHHZSCJ-UHFFFAOYSA-M 0.000 claims abstract description 16
- 239000000314 lubricant Substances 0.000 claims abstract description 16
- HRPVXLWXLXDGHG-UHFFFAOYSA-N Acrylamide Chemical compound NC(=O)C=C HRPVXLWXLXDGHG-UHFFFAOYSA-N 0.000 claims abstract description 14
- 239000003112 inhibitor Substances 0.000 claims abstract description 11
- MAGFQRLKWCCTQJ-UHFFFAOYSA-N 4-ethenylbenzenesulfonic acid Chemical compound OS(=O)(=O)C1=CC=C(C=C)C=C1 MAGFQRLKWCCTQJ-UHFFFAOYSA-N 0.000 claims abstract description 9
- 229910000029 sodium carbonate Inorganic materials 0.000 claims abstract description 9
- 229920002472 Starch Polymers 0.000 claims description 41
- 239000008107 starch Substances 0.000 claims description 41
- 235000019698 starch Nutrition 0.000 claims description 41
- 235000015112 vegetable and seed oil Nutrition 0.000 claims description 26
- 239000008158 vegetable oil Substances 0.000 claims description 26
- WHNWPMSKXPGLAX-UHFFFAOYSA-N N-Vinyl-2-pyrrolidone Chemical group C=CN1CCCC1=O WHNWPMSKXPGLAX-UHFFFAOYSA-N 0.000 claims description 20
- 229920000945 Amylopectin Polymers 0.000 claims description 16
- 229920000856 Amylose Polymers 0.000 claims description 16
- 239000004115 Sodium Silicate Substances 0.000 claims description 7
- NTHWMYGWWRZVTN-UHFFFAOYSA-N sodium silicate Chemical group [Na+].[Na+].[O-][Si]([O-])=O NTHWMYGWWRZVTN-UHFFFAOYSA-N 0.000 claims description 7
- 229910052911 sodium silicate Inorganic materials 0.000 claims description 7
- 239000000843 powder Substances 0.000 claims description 4
- 239000000654 additive Substances 0.000 claims description 3
- 230000000996 additive effect Effects 0.000 claims description 3
- KXGFMDJXCMQABM-UHFFFAOYSA-N 2-methoxy-6-methylphenol Chemical class [CH]OC1=CC=CC([CH])=C1O KXGFMDJXCMQABM-UHFFFAOYSA-N 0.000 claims description 2
- ZLMJMSJWJFRBEC-UHFFFAOYSA-N Potassium Chemical compound [K] ZLMJMSJWJFRBEC-UHFFFAOYSA-N 0.000 claims description 2
- 150000003863 ammonium salts Chemical class 0.000 claims description 2
- 229920001971 elastomer Polymers 0.000 claims description 2
- 229920002120 photoresistant polymer Polymers 0.000 claims description 2
- 229920002239 polyacrylonitrile Polymers 0.000 claims description 2
- 239000011591 potassium Substances 0.000 claims description 2
- 229910052700 potassium Inorganic materials 0.000 claims description 2
- 238000000034 method Methods 0.000 abstract description 7
- 239000011435 rock Substances 0.000 abstract description 2
- 238000003756 stirring Methods 0.000 description 20
- ROOXNKNUYICQNP-UHFFFAOYSA-N ammonium persulfate Chemical compound [NH4+].[NH4+].[O-]S(=O)(=O)OOS([O-])(=O)=O ROOXNKNUYICQNP-UHFFFAOYSA-N 0.000 description 18
- 229940092782 bentonite Drugs 0.000 description 15
- 238000002360 preparation method Methods 0.000 description 12
- 235000012424 soybean oil Nutrition 0.000 description 11
- 239000003549 soybean oil Substances 0.000 description 11
- 229910001870 ammonium persulfate Inorganic materials 0.000 description 9
- 239000003795 chemical substances by application Substances 0.000 description 7
- 230000000694 effects Effects 0.000 description 7
- 239000000126 substance Substances 0.000 description 7
- 238000002156 mixing Methods 0.000 description 6
- TZCXTZWJZNENPQ-UHFFFAOYSA-L barium sulfate Chemical compound [Ba+2].[O-]S([O-])(=O)=O TZCXTZWJZNENPQ-UHFFFAOYSA-L 0.000 description 5
- 239000010428 baryte Substances 0.000 description 5
- 229910052601 baryte Inorganic materials 0.000 description 5
- 239000012065 filter cake Substances 0.000 description 5
- 239000003999 initiator Substances 0.000 description 5
- 238000006243 chemical reaction Methods 0.000 description 4
- 230000000052 comparative effect Effects 0.000 description 4
- 238000005520 cutting process Methods 0.000 description 4
- 238000010438 heat treatment Methods 0.000 description 4
- 238000006116 polymerization reaction Methods 0.000 description 4
- 230000000379 polymerizing effect Effects 0.000 description 4
- USHAGKDGDHPEEY-UHFFFAOYSA-L potassium persulfate Chemical compound [K+].[K+].[O-]S(=O)(=O)OOS([O-])(=O)=O USHAGKDGDHPEEY-UHFFFAOYSA-L 0.000 description 4
- XFTALRAZSCGSKN-UHFFFAOYSA-M sodium;4-ethenylbenzenesulfonate Chemical compound [Na+].[O-]S(=O)(=O)C1=CC=C(C=C)C=C1 XFTALRAZSCGSKN-UHFFFAOYSA-M 0.000 description 4
- AGBXYHCHUYARJY-UHFFFAOYSA-N 2-phenylethenesulfonic acid Chemical compound OS(=O)(=O)C=CC1=CC=CC=C1 AGBXYHCHUYARJY-UHFFFAOYSA-N 0.000 description 3
- -1 4-vinyl pyridine benzene sulfonate Chemical compound 0.000 description 3
- 244000208060 Lawsonia inermis Species 0.000 description 3
- 238000004132 cross linking Methods 0.000 description 3
- ONCZQWJXONKSMM-UHFFFAOYSA-N dialuminum;disodium;oxygen(2-);silicon(4+);hydrate Chemical group 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 description 3
- 239000004744 fabric Substances 0.000 description 3
- 238000001914 filtration Methods 0.000 description 3
- 238000005457 optimization Methods 0.000 description 3
- 239000002245 particle Substances 0.000 description 3
- 229940080314 sodium bentonite Drugs 0.000 description 3
- 229910000280 sodium bentonite Inorganic materials 0.000 description 3
- 229930003231 vitamin Natural products 0.000 description 3
- 239000011782 vitamin Substances 0.000 description 3
- 229940088594 vitamin Drugs 0.000 description 3
- 235000013343 vitamin Nutrition 0.000 description 3
- 150000003722 vitamin derivatives Chemical class 0.000 description 3
- HZAXFHJVJLSVMW-UHFFFAOYSA-N 2-Aminoethan-1-ol Chemical compound NCCO HZAXFHJVJLSVMW-UHFFFAOYSA-N 0.000 description 2
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 description 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 239000002202 Polyethylene glycol Substances 0.000 description 2
- WCUXLLCKKVVCTQ-UHFFFAOYSA-M Potassium chloride Chemical compound [Cl-].[K+] WCUXLLCKKVVCTQ-UHFFFAOYSA-M 0.000 description 2
- 239000004927 clay Substances 0.000 description 2
- 238000010494 dissociation reaction Methods 0.000 description 2
- 230000005593 dissociations Effects 0.000 description 2
- 238000009826 distribution Methods 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 230000001050 lubricating effect Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000011056 performance test Methods 0.000 description 2
- 229920001223 polyethylene glycol Polymers 0.000 description 2
- 230000001603 reducing effect Effects 0.000 description 2
- 238000010008 shearing Methods 0.000 description 2
- 238000001179 sorption measurement Methods 0.000 description 2
- DZSVIVLGBJKQAP-UHFFFAOYSA-N 1-(2-methyl-5-propan-2-ylcyclohex-2-en-1-yl)propan-1-one Chemical compound CCC(=O)C1CC(C(C)C)CC=C1C DZSVIVLGBJKQAP-UHFFFAOYSA-N 0.000 description 1
- LCPVQAHEFVXVKT-UHFFFAOYSA-N 2-(2,4-difluorophenoxy)pyridin-3-amine Chemical compound NC1=CC=CN=C1OC1=CC=C(F)C=C1F LCPVQAHEFVXVKT-UHFFFAOYSA-N 0.000 description 1
- 239000001763 2-hydroxyethyl(trimethyl)azanium Substances 0.000 description 1
- 235000019743 Choline chloride Nutrition 0.000 description 1
- 229920002261 Corn starch Polymers 0.000 description 1
- BRLQWZUYTZBJKN-UHFFFAOYSA-N Epichlorohydrin Chemical compound ClCC1CO1 BRLQWZUYTZBJKN-UHFFFAOYSA-N 0.000 description 1
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 description 1
- 235000019738 Limestone Nutrition 0.000 description 1
- CERQOIWHTDAKMF-UHFFFAOYSA-N Methacrylic acid Chemical compound CC(=C)C(O)=O CERQOIWHTDAKMF-UHFFFAOYSA-N 0.000 description 1
- 235000019484 Rapeseed oil Nutrition 0.000 description 1
- GSEJCLTVZPLZKY-UHFFFAOYSA-N Triethanolamine Chemical compound OCCN(CCO)CCO GSEJCLTVZPLZKY-UHFFFAOYSA-N 0.000 description 1
- 239000008186 active pharmaceutical agent Substances 0.000 description 1
- 239000013543 active substance Substances 0.000 description 1
- 239000010426 asphalt Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000006065 biodegradation reaction Methods 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 229910000019 calcium carbonate Inorganic materials 0.000 description 1
- 125000003178 carboxy group Chemical group [H]OC(*)=O 0.000 description 1
- 239000004359 castor oil Substances 0.000 description 1
- 235000019438 castor oil Nutrition 0.000 description 1
- SGMZJAMFUVOLNK-UHFFFAOYSA-M choline chloride Chemical compound [Cl-].C[N+](C)(C)CCO SGMZJAMFUVOLNK-UHFFFAOYSA-M 0.000 description 1
- 229960003178 choline chloride Drugs 0.000 description 1
- 239000003240 coconut oil Substances 0.000 description 1
- 235000019864 coconut oil Nutrition 0.000 description 1
- 239000002285 corn oil Substances 0.000 description 1
- 235000005687 corn oil Nutrition 0.000 description 1
- 239000008120 corn starch Substances 0.000 description 1
- 239000003431 cross linking reagent Substances 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000003795 desorption Methods 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
- 230000005611 electricity Effects 0.000 description 1
- 239000000499 gel Substances 0.000 description 1
- ZEMPKEQAKRGZGQ-XOQCFJPHSA-N glycerol triricinoleate Natural products CCCCCC[C@@H](O)CC=CCCCCCCCC(=O)OC[C@@H](COC(=O)CCCCCCCC=CC[C@@H](O)CCCCCC)OC(=O)CCCCCCCC=CC[C@H](O)CCCCCC ZEMPKEQAKRGZGQ-XOQCFJPHSA-N 0.000 description 1
- 229910052595 hematite Inorganic materials 0.000 description 1
- 239000011019 hematite Substances 0.000 description 1
- 238000005098 hot rolling Methods 0.000 description 1
- 230000036571 hydration Effects 0.000 description 1
- 238000006703 hydration reaction Methods 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 230000002209 hydrophobic effect Effects 0.000 description 1
- 125000002887 hydroxy group Chemical group [H]O* 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- LIKBJVNGSGBSGK-UHFFFAOYSA-N iron(3+);oxygen(2-) Chemical compound [O-2].[O-2].[O-2].[Fe+3].[Fe+3] LIKBJVNGSGBSGK-UHFFFAOYSA-N 0.000 description 1
- 239000006028 limestone Substances 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000000178 monomer Substances 0.000 description 1
- OVHHHVAVHBHXAK-UHFFFAOYSA-N n,n-diethylprop-2-enamide Chemical compound CCN(CC)C(=O)C=C OVHHHVAVHBHXAK-UHFFFAOYSA-N 0.000 description 1
- 229940088644 n,n-dimethylacrylamide Drugs 0.000 description 1
- YLGYACDQVQQZSW-UHFFFAOYSA-N n,n-dimethylprop-2-enamide Chemical compound CN(C)C(=O)C=C YLGYACDQVQQZSW-UHFFFAOYSA-N 0.000 description 1
- 229930014626 natural product Natural products 0.000 description 1
- 231100000956 nontoxicity Toxicity 0.000 description 1
- 229920002401 polyacrylamide Polymers 0.000 description 1
- 239000001103 potassium chloride Substances 0.000 description 1
- 235000011164 potassium chloride Nutrition 0.000 description 1
- 238000011085 pressure filtration Methods 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 239000005871 repellent Substances 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000000518 rheometry Methods 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 239000011734 sodium Substances 0.000 description 1
- 229910052708 sodium Inorganic materials 0.000 description 1
- 229940080264 sodium dodecylbenzenesulfonate Drugs 0.000 description 1
- CHQMHPLRPQMAMX-UHFFFAOYSA-L sodium persulfate Substances [Na+].[Na+].[O-]S(=O)(=O)OOS([O-])(=O)=O CHQMHPLRPQMAMX-UHFFFAOYSA-L 0.000 description 1
- UGTZMIPZNRIWHX-UHFFFAOYSA-K sodium trimetaphosphate Chemical compound [Na+].[Na+].[Na+].[O-]P1(=O)OP([O-])(=O)OP([O-])(=O)O1 UGTZMIPZNRIWHX-UHFFFAOYSA-K 0.000 description 1
- 239000007790 solid phase Substances 0.000 description 1
- BDHFUVZGWQCTTF-UHFFFAOYSA-M sulfonate Chemical compound [O-]S(=O)=O BDHFUVZGWQCTTF-UHFFFAOYSA-M 0.000 description 1
- 230000002195 synergetic effect Effects 0.000 description 1
- 235000013311 vegetables Nutrition 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
- C09K8/20—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
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F251/00—Macromolecular compounds obtained by polymerising monomers on to polysaccharides or derivatives thereof
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F289/00—Macromolecular compounds obtained by polymerising monomers on to macromolecular compounds not provided for in groups C08F251/00 - C08F287/00
-
- 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
- C09K8/50—Compositions for plastering borehole walls, i.e. compositions for temporary consolidation of borehole walls
- C09K8/504—Compositions based on water or polar solvents
- C09K8/506—Compositions based on water or polar solvents containing organic compounds
- C09K8/508—Compositions based on water or polar solvents containing organic compounds macromolecular compounds
- C09K8/514—Compositions based on water or polar solvents containing organic compounds macromolecular compounds of natural origin, e.g. polysaccharides, cellulose
-
- 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
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Dispersion Chemistry (AREA)
- Health & Medical Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Lubricants (AREA)
Abstract
The application relates to an environment-friendly water-based drilling fluid, which comprises the following components in percentage by weight based on 100% of the total weight: bentonite 2% -15%0.2 to 3 percent of modified starch, 0.1 to 5 percent of filtrate reducer, 0.05 to 0.9 percent of inhibitor, 0.2 to 1 percent of lubricant, 0 to 2 percent of sodium carbonate, 0 to 0.5 percent of sodium hydroxide and the balance of water; the modifier of the modified starch is acrylamide, dimethyl diallyl ammonium chloride and p-styrene sulfonate, and the weight ratio is (1-5): (6-10): 1, the density of the drilling fluid is 1.25-1.45g/cm 3 The method comprises the steps of carrying out a first treatment on the surface of the The drilling fluid is safe, environment-friendly and degradable, has excellent plugging performance, high-temperature stability, rock carrying performance and lubricity, and can be used in the deep drilling process.
Description
Technical Field
The application relates to the field of C09K8/03, in particular to an environment-friendly water-based drilling fluid and application thereof.
Background
As an important natural product, the starch has a series of advantages of low cost, easy obtainment, environmental protection, no toxicity, easy modification, easy biodegradation and the like, and is one of research hotspots of environmental protection type drilling fluid treatment agents. However, the current starch-based drilling fluid has limited temperature resistance, is only limited to be used at about 100 ℃, is easy to dissociate at a higher temperature, and is difficult to adapt to a high Wen Shenceng drilling environment; in the prior art, a plurality of methods for modifying starch or using the modified starch with other modified natural materials have been developed, and although the modified starch has strong salt resistance, the drilling fluid of the modified starch still cannot meet the increasingly high use requirements of environmentally sensitive areas in terms of plugging property and high-temperature stability.
Chinese patent CN106634880B discloses a method for preparing an amphiphilic starch fluid loss additive for water-based drilling fluid, which comprises: after the waxy corn starch reacts with a hydrophilic agent, the hydrophobic monomer is grafted, and the filtrate reducer has better high temperature resistance and can be used at 130-150 ℃, but the plugging performance of the filtrate reducer is far insufficient only by means of the structural strength of the starch per se to plug cracks of a well wall; chinese patent CN109266318B discloses a high-temperature-resistant tackifying and cutting agent for water-based drilling fluid, a preparation method thereof and the drilling fluid, wherein the tackifying and cutting agent adopts starch microgel, and the relative concentration of starch and cross-linking agents of epichlorohydrin and sodium trimetaphosphate is limited, so that the starch has good tackifying and cutting effect, but the drilling fluid system still has the defect of large change of filtration loss at high temperature.
Disclosure of Invention
In order to solve the technical problems, the application provides the environment-friendly water-based drilling fluid, which balances and improves the crosslinking degree of a system, the dispersibility of solid phase components and the adhesion and enhancement effects of effective active substances on a well wall through the regulation and control of an intermolecular network structure in the system, so that the drilling fluid has excellent stability, a filtration reducing effect and a wall fixing effect at a high temperature.
Further, the environment-friendly water-based drilling fluid comprises the following components in percentage by weight based on 100% of the total weight: 2-15% of bentonite, 0.2-3% of modified starch, 0.1-5% of filtrate reducer, 0.05-0.9% of inhibitor, 0.2-1% of lubricant, 0-2% of sodium carbonate, 0-0.5% of sodium hydroxide and the balance of water.
Although the starch has better filtration-reducing effect, under high-temperature and high-pressure shearing, the network structure of the starch is partially decomposed, and the compactness and compressibility of a filter cake formed by the drilling fluid are reduced; by modifying the molecular chain of the starch, the rupture of hydrogen bonds and the disintegration of the crystal structure of the starch in a system under a high-temperature environment are inhibited.
Further, the modified starch is formed by modifying starch by a modifier, wherein the modifier is at least one selected from acrylamide, dimethyl diallyl ammonium chloride, methacrylic acid, 2-acrylamide-2-methylpropanesulfonic acid, 2-ethyl-2-allyl ammonium chloride, p-styrene sulfonate, 4-vinyl pyridine benzene sulfonate, vinyl pyrrolidone, N-methyl diallyl butane sulfonate, N, N-dimethyl acrylamide or N, N-diethyl acrylamide and the like.
Further, the modifier is at least two selected from acrylamide, dimethyl diallyl ammonium chloride and p-styrene sulfonate.
Preferably, the modifier is a combination of acrylamide, dimethyldiallylammonium chloride and p-styrene sulfonate.
In a preferred embodiment, when the weight ratio of acrylamide, dimethyldiallylammonium chloride and p-styrenesulfonate is (1-5): (6-10): 1, the drilling fluid has excellent filtrate loss reducing effect and high-temperature stability; the inventors analyzed possible reasons for: acrylamide and dimethyl diallyl ammonium chloride can be combined with hydroxyl and carboxyl on a starch molecular chain, so that the high-temperature stability of the starch molecular chain is improved, the high-temperature stability of starch is improved by grafting of styrene sulfonate, the bearing performance of drilling fluid is improved by the rigid structure, the use amount of bentonite can be effectively reduced, but when the addition amount is excessive, the adhesion of effective substances of the drilling fluid on the surface of a well wall is obviously slowed down by a larger space blocking effect, the filtrate loss is increased, the viscosity of a system is too high, and the well drilling and cutting force is also reduced; in addition, the dimethyl diallyl ammonium chloride presents electropositivity, has certain electronegativity to styrene sulfonate, and when the relative content of the dimethyl diallyl ammonium chloride and the styrene sulfonate is proper, the particle size distribution of bentonite can be changed, so that a filter cake is thinner and denser, and the high-temperature high-pressure filtration loss is reduced.
Further, the weight ratio of the acrylamide to the dimethyldiallylammonium chloride to the p-styrene sulfonate is (2-4): (6-9): 1.
in a preferred embodiment, the weight ratio of acrylamide, dimethyldiallylammonium chloride and p-styrene sulfonate is 3:7:1.
further, the starch is amylose and/or amylopectin.
Preferably, the starch is amylose and amylopectin, and the weight ratio is (1-3): 1. the study found that: the molecular chain of the amylose is relatively long, the crosslinking degree in the system is insufficient, particularly, the viscosity change degree of the drilling fluid is large after shearing at high temperature, the density of a filter cake formed by adopting the amylose alone is poor, and the filtration loss is high; however, the acting force of the amylopectin and components such as a filtrate reducer in the amylopectin and the system is too strong, the formed cross-linked structure is too high, and the dispersibility of bentonite is deteriorated due to the larger viscosity of the drilling fluid; therefore, the molecular weight and the relative content of the two are regulated, so that the network bridging structure formed by the starch has better bearing capacity, and the compactness of a filter cake formed by the bentonite is improved.
Preferably, the starch has a weight average molecular weight of 4 to 9 ten thousand.
Further, the preparation method of the modified starch comprises the following steps: dissolving starch in water, reacting at 60-90deg.C for 0.5-2 hr, adding modifier and initiator, and polymerizing at 80-100deg.C for 4-6 hr.
Further, the modifier is added in an amount of 50-70wt.% of the starch content.
Further, the initiator can be selected from one of potassium persulfate, ammonium persulfate and sodium persulfate, the addition amount is 0.1-0.8wt.% of the total amount of starch and modifier, and the pH of the polymerization reaction is 7.5-8.5.
Further, the filtrate reducer is at least one selected from reclaimed rubber powder, potassium humate, sulfonated phenolic resin, polyacrylonitrile ammonium salt, JT-888, HMPa and CAT-FL.
In a preferred embodiment, the fluid loss additive is JT-888.
Further, the inhibitor is at least one selected from positive electricity gel, sodium silicate, polyethylene glycol, potassium chloride, triethanolamine, polyacrylamide and choline chloride.
Further, the inhibitor is sodium silicate and/or positive photoresist.
Preferably, the inhibitor is sodium silicate, and the dosage of the inhibitor is 0.1-0.8% of the total weight of the components.
Further, the lubricant is at least one of alkylphenol ethoxylates, vegetable oil, modified vegetable oil, vegetable asphalt and polyethylene glycol.
Further, the lubricant is a modified vegetable oil.
Preferably, the modified vegetable oil is formed by modifying vegetable oil by at least one of ethanolamine, sodium dodecyl benzene sulfonate, castor oil sodium sulfonate, imidazoline quaternary ammonium salt and N-vinyl pyrrolidone.
Preferably, the modified vegetable oil is obtained by modifying vegetable oil by N-vinyl pyrrolidone.
Although the modification of the starch by the amide bond can reduce the desorption of the starch on the surface of the bentonite at high temperature, the high temperature resistant effect still has a certain rising space; the application surprisingly finds that: when the vegetable oil is modified by N-vinyl pyrrolidone, the high-temperature stability of the drilling fluid is further improved; the possible reasons are presumed to be: the N-vinyl pyrrolidone can further stabilize amide bonds in the modified starch, inhibit dissociation of the amide bonds and improve the water-repellent capacity, so that the modified starch has an excellent lubricating effect, can stabilize the structural stability of the modified starch in the drilling process, and further improves the high temperature resistance of the drilling fluid.
Further, the vegetable oil includes, but is not limited to, any one or a combination of several of corn oil, soybean oil, rapeseed oil, and coconut oil.
Further, the preparation method of the modified vegetable oil comprises the following steps: and (3) dropwise adding a certain amount of sodium hydroxide solution into the vegetable oil to enable the system to be in an alkaline condition, then dropwise adding a certain amount of N-vinyl pyrrolidone, and then dropwise adding a certain amount of ammonium persulfate. Heating the system to 70-90 ℃, stirring at constant temperature for 3-5h, and purifying after the reaction is finished to obtain the modified vegetable oil.
Further, the alkaline condition is pH7.8-9.5.
Further, the addition amount of the N-vinyl pyrrolidone is 20-45wt.% of the addition amount of the vegetable oil.
Preferably, the addition amount of the N-vinyl pyrrolidone is 35-45wt.% of the addition amount of the vegetable oil.
Further, the ammonium persulfate is used in an amount of 0.3 to 0.5wt.% based on the total amount of the vegetable oil and the N-vinylpyrrolidone.
Further, the environmental-friendly water-based drilling fluid also comprises a weighting agent, wherein the weighting agent comprises any one of barite, calcium carbonate powder, hematite, iron ore powder and limestone, and preferably is barite.
Furthermore, the invention does not strictly limit the content of the weighting agent, and can be adjusted according to the use requirement.
In addition, the application also provides application of the environment-friendly water-based drilling fluid in deep drilling.
Preferably, the density of the environment-friendly water-based drilling fluid is 1.25-1.45g/cm 3 。
The beneficial effects are that:
1. the water-based drilling fluid is safe and environment-friendly, has excellent rheological property, plugging property and high-temperature resistance, can be effectively applied to sensitive stratum environment, can be used in a deep drilling process, and can effectively improve the stability of a well wall and reduce the risk of instability of the well wall.
2. The modified starch is grafted by different types of modifiers, the hydration and adsorption groups of the structure of the modified starch are increased, the particle size distribution of clay particles is changed by forming a strong adsorption effect with clay, a filter cake is thin and compact, the pressure-bearing plugging performance of plugging liquid can be further improved by the crosslinking effect in the structure, and the high-temperature high-pressure fluid loss is reduced.
3. The modified vegetable oil can further stabilize modified starch, inhibit dissociation in a high-temperature environment, and further improve high-temperature rheological property and high-temperature resistance of drilling fluid while enabling the system to have excellent lubricating property.
4. The water-based drilling fluid disclosed by the application has good rock carrying capacity and fluid loss performance by utilizing the synergistic effect of the components.
Detailed Description
Examples
Example 1
The application provides an environment-friendly water-based drilling fluid, which comprises the following components in percentage by weight based on 100% of the total weight: 9% of bentonite, 1.6% of modified starch, 3.0% of filtrate reducer JT-888, 0.45% of sodium silicate, 0.6% of lubricant, 1% of sodium carbonate, 0.3% of sodium hydroxide and the balance of water;
the preparation method of the modified starch comprises the following steps: dissolving starch in water, reacting at 80 ℃ for 1h, adding a modifier and potassium persulfate, and polymerizing at 90 ℃ for 5 h;
the starch is amylose and amylopectin, and the weight ratio is 2:1, the weight average molecular weight of the amylose is 45000, and the weight average molecular weight of the amylopectin is 80000; the addition amount of the modifier is 60wt.% of the starch content, the modifier is a combination of acrylamide, dimethyl diallyl ammonium chloride and sodium p-styrene sulfonate, and the weight ratio is 3:7:1, a step of; the initiator was added in an amount of 0.6wt.% of the total amount of starch and modifier and the pH of the polymerization reaction was 8.0.
The lubricant is modified vegetable oil, and the preparation method comprises the following steps: and (3) dropwise adding a certain amount of sodium hydroxide solution into the soybean oil to enable the pH value of the system to be 8.5, then dropwise adding N-vinyl pyrrolidone, uniformly stirring, and then dropwise adding ammonium persulfate. Heating the system to 75 ℃, stirring at constant temperature for 4 hours, and purifying after the reaction is finished to obtain the modified vegetable oil. Wherein the addition amount of N-vinyl pyrrolidone is 40wt.% of soybean oil, and the addition amount of ammonium persulfate is 0.5wt.% of the total amount of soybean oil and N-vinyl pyrrolidone.
The preparation method of the environment-friendly water-based drilling fluid comprises the following steps: firstly, mixing and stirring water and bentonite for 60 minutes, and then stirring after standing for 24 hours at normal temperatureSequentially adding the filtrate reducer, the inhibitor, the modified starch and the lubricant under stirring, uniformly mixing, and then adding sodium carbonate and sodium hydroxide and uniformly stirring; finally adding barite and stirring. The density of the drilling fluid is 1.35g/cm 3 ；
The bentonite is sodium bentonite, and is purchased from Chengdu long-message optimization chemical industry Co., ltd, and has the specification: 300 meshes; the amylose was purchased from Wu Hanka cloth chemical company, inc; amylopectin was purchased from henna vitamin biotechnology limited; the filtrate reducer JT-888 brand is Deshun.
Example 2
The application provides an environment-friendly water-based drilling fluid, which comprises the following components in percentage by weight based on 100% of the total weight: 4% of bentonite, 3% of modified starch, 5% of filtrate reducer JT-888%, 0.9% of sodium silicate, 1% of lubricant, 2% of sodium carbonate, 0.2% of sodium hydroxide and the balance of water;
the preparation method of the modified starch comprises the following steps: dissolving starch in water, reacting at 60 ℃ for 2 hours, adding a modifier and potassium persulfate, and polymerizing at 100 ℃ for 4 hours to obtain the modified starch;
the starch is amylose and amylopectin, and the weight ratio is 1:1, an amylose weight average molecular weight of 45000, and an amylopectin weight average molecular weight of 60000; the addition amount of the modifier is 50wt.% of the starch content, the modifier is a combination of acrylamide, dimethyl diallyl ammonium chloride and sodium p-styrene sulfonate, and the weight ratio is 2:9:1, a step of; the initiator was added in an amount of 0.8wt.% of the total amount of starch and modifier and the pH of the polymerization reaction was 8.5.
The lubricant is modified vegetable oil, and the preparation method comprises the following steps: and (3) dropwise adding a certain amount of sodium hydroxide solution into the soybean oil to enable the pH of the system to be 7.8, then dropwise adding N-vinyl pyrrolidone, uniformly stirring, and then dropwise adding ammonium persulfate. Heating the system to 70 ℃, stirring at constant temperature for 5 hours, and purifying after the reaction is finished to obtain the modified vegetable oil. Wherein the addition amount of N-vinyl pyrrolidone is 35wt.% of soybean oil, and the addition amount of ammonium persulfate is 0.5wt.% of the total amount of soybean oil and N-vinyl pyrrolidone.
The environment-friendly water-based drillThe preparation method of the well fluid comprises the following steps: firstly, mixing and stirring water and bentonite for 60 minutes, standing for 24 hours at normal temperature, sequentially adding a filtrate reducer, an inhibitor, modified starch and a lubricant under stirring, uniformly mixing, and then adding sodium carbonate and sodium hydroxide, and uniformly stirring; finally adding barite and stirring. The density of the drilling fluid is 1.45g/cm 3 ；
The bentonite is sodium bentonite, and is purchased from Chengdu long-message optimization chemical industry Co., ltd, and has the specification: 300 meshes; the amylose was purchased from Wu Hanka cloth chemical company, inc; amylopectin was purchased from henna vitamin biotechnology limited; the filtrate reducer JT-888 brand is Deshun.
Example 3
The application provides an environment-friendly water-based drilling fluid, which comprises the following components in percentage by weight based on 100% of the total weight: 12% of bentonite, 0.8% of modified starch, 0.3% of filtrate reducer JT-888, 0.05% of sodium silicate, 0.2% of lubricant, 2% of sodium carbonate and the balance of water;
the preparation method of the modified starch comprises the following steps: dissolving starch in water, reacting at 90 ℃ for 0.5h, adding a modifier and potassium persulfate, and polymerizing at 80 ℃ for 6 h;
the starch is amylose and amylopectin, and the weight ratio is 3:1, an amylose molecular weight of 45000, and an amylopectin molecular weight of 90000; the addition amount of the modifier is 70wt.% of the starch content, the modifier is a combination of acrylamide, dimethyl diallyl ammonium chloride and sodium p-styrene sulfonate, and the weight ratio is 4:6:1, a step of; the initiator was added in an amount of 0.3wt.% of the total amount of starch and modifier and the pH of the polymerization reaction was 8.0.
The lubricant is modified vegetable oil, and the preparation method comprises the following steps: and (3) dropwise adding a certain amount of sodium hydroxide solution into the soybean oil to enable the pH of the system to be 7.8, then dropwise adding N-vinyl pyrrolidone, uniformly stirring, and then dropwise adding ammonium persulfate. Heating the system to 90 ℃, stirring at constant temperature for 3 hours, and purifying after the reaction is finished to obtain the modified vegetable oil. Wherein the addition amount of N-vinyl pyrrolidone is 45wt.% of soybean oil, and the addition amount of ammonium persulfate is 0.3wt.% of the total amount of soybean oil and N-vinyl pyrrolidone.
The preparation method of the environment-friendly water-based drilling fluid comprises the following steps: firstly, mixing and stirring water and bentonite for 60 minutes, standing for 24 hours at normal temperature, sequentially adding a filtrate reducer, an inhibitor, modified starch and a lubricant under stirring, uniformly mixing, and then adding sodium carbonate and sodium hydroxide, and uniformly stirring; finally adding barite and stirring. The density of the drilling fluid is 1.25g/cm 3 ；
The bentonite is sodium bentonite, and is purchased from Chengdu long-message optimization chemical industry Co., ltd, and has the specification: 300 meshes; the amylose was purchased from Wu Hanka cloth chemical company, inc; amylopectin was purchased from henna vitamin biotechnology limited; the filtrate reducer JT-888 brand is Deshun.
Comparative example 1
Substantially identical to example 1, except that: the starch is amylose and amylopectin, and the weight ratio is 1:2, the amylose weight average molecular weight was 45000, and the amylopectin weight average molecular weight was 80000.
Comparative example 2
Substantially identical to example 1, except that: the modifier is a combination of acrylamide, dimethyl diallyl ammonium chloride and sodium p-styrenesulfonate, and the weight ratio is 1:1:1.
comparative example 3
Substantially identical to example 1, except that: the lubricant is soybean oil.
Comparative example 4
Substantially identical to example 1, except that: the addition amount of the N-vinyl pyrrolidone is 10wt.% of the addition amount of the vegetable oil.
The performance test method comprises the following steps:
the rheology, normal temperature and pressure fluid loss (API FL) and high temperature and high pressure fluid loss (HTHP FL) of the drilling fluid of the examples were evaluated with reference to GB/T16782-1997 before and after hot rolling at 150 ℃ for 16 hours; wherein YP is the dynamic shear force.
Performance test results:
TABLE 1
Claims (10)
1. An environmental-friendly water-based drilling fluid, which is characterized by comprising the following components in percentage by weight of 100 percent of the total weight: 2-15% of bentonite, 0.2-3% of modified starch, 0.1-5% of filtrate reducer, 0.05-0.9% of inhibitor, 0.2-1% of lubricant, 0-2% of sodium carbonate, 0-0.5% of sodium hydroxide and the balance of water.
2. The environment-friendly water-based drilling fluid according to claim 1, wherein the modified starch is formed by modifying starch by a modifier, and the modifier is at least two selected from acrylamide, dimethyl diallyl ammonium chloride and p-styrene sulfonate.
3. The environmentally friendly water-based drilling fluid of claim 2 wherein the modifier is a combination of acrylamide, dimethyldiallylammonium chloride and p-styrene sulfonate.
4. The environment-friendly water-based drilling fluid as claimed in claim 2, wherein the starch is amylose and amylopectin, and the weight ratio is (1-3): 1.
5. the environmentally friendly water-based drilling fluid of claim 4 wherein the starch has a weight average molecular weight of 4-9 ten thousand.
6. The environmentally friendly water-based drilling fluid of claim 1 wherein the fluid loss additive is selected from at least one of reclaimed rubber powder, potassium humate, sulfonated phenolic resin, polyacrylonitrile ammonium salt, JT-888, HMPa, CAT-FL.
7. The environmentally friendly water-based drilling fluid according to claim 1, wherein the inhibitor is sodium silicate and/or positive photoresist.
8. The environmentally friendly water-based drilling fluid of claim 1 wherein the lubricant is a modified vegetable oil, the modified vegetable oil being a vegetable oil modified with N-vinyl pyrrolidone.
9. Use of the environmentally friendly water-based drilling fluid according to any one of claims 1-8 in deep drilling.
10. The use of the environmentally friendly water-based drilling fluid as claimed in claim 9 in deep drilling, wherein the density of the environmentally friendly water-based drilling fluid is 1.25-1.45g/cm 3 。
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