CN116675810A - Environment-friendly high-temperature-resistant and saturated-salt-resistant tackifier for water-based drilling fluid and preparation method and application thereof - Google Patents
Environment-friendly high-temperature-resistant and saturated-salt-resistant tackifier for water-based drilling fluid and preparation method and application thereof Download PDFInfo
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- CN116675810A CN116675810A CN202310883268.3A CN202310883268A CN116675810A CN 116675810 A CN116675810 A CN 116675810A CN 202310883268 A CN202310883268 A CN 202310883268A CN 116675810 A CN116675810 A CN 116675810A
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 99
- 238000005553 drilling Methods 0.000 title claims abstract description 76
- 239000012530 fluid Substances 0.000 title claims abstract description 66
- 238000002360 preparation method Methods 0.000 title claims abstract description 19
- 239000000178 monomer Substances 0.000 claims abstract description 70
- 150000003839 salts Chemical class 0.000 claims abstract description 37
- 230000002209 hydrophobic effect Effects 0.000 claims abstract description 32
- 229920006395 saturated elastomer Polymers 0.000 claims abstract description 26
- 235000010413 sodium alginate Nutrition 0.000 claims abstract description 25
- 229940005550 sodium alginate Drugs 0.000 claims abstract description 25
- 239000000661 sodium alginate Substances 0.000 claims abstract description 25
- 238000003756 stirring Methods 0.000 claims abstract description 25
- IXPNQXFRVYWDDI-UHFFFAOYSA-N 1-methyl-2,4-dioxo-1,3-diazinane-5-carboximidamide Chemical compound CN1CC(C(N)=N)C(=O)NC1=O IXPNQXFRVYWDDI-UHFFFAOYSA-N 0.000 claims abstract description 23
- 125000000391 vinyl group Chemical group [H]C([*])=C([H])[H] 0.000 claims abstract description 21
- 229920002554 vinyl polymer Polymers 0.000 claims abstract description 21
- 239000003431 cross linking reagent Substances 0.000 claims abstract description 20
- 238000006243 chemical reaction Methods 0.000 claims abstract description 11
- 239000003999 initiator Substances 0.000 claims abstract description 10
- 238000005406 washing Methods 0.000 claims abstract description 9
- 238000001035 drying Methods 0.000 claims abstract description 8
- 239000003093 cationic surfactant Substances 0.000 claims abstract description 7
- 238000001914 filtration Methods 0.000 claims abstract description 6
- 238000010438 heat treatment Methods 0.000 claims abstract description 6
- 238000002156 mixing Methods 0.000 claims abstract description 6
- 238000004090 dissolution Methods 0.000 claims abstract description 3
- 239000012071 phase Substances 0.000 claims description 25
- 238000000034 method Methods 0.000 claims description 24
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 13
- 239000007790 solid phase Substances 0.000 claims description 11
- MNCGMVDMOKPCSQ-UHFFFAOYSA-M sodium;2-phenylethenesulfonate Chemical compound [Na+].[O-]S(=O)(=O)C=CC1=CC=CC=C1 MNCGMVDMOKPCSQ-UHFFFAOYSA-M 0.000 claims description 9
- 239000007864 aqueous solution Substances 0.000 claims description 8
- MYRTYDVEIRVNKP-UHFFFAOYSA-N 1,2-Divinylbenzene Chemical compound C=CC1=CC=CC=C1C=C MYRTYDVEIRVNKP-UHFFFAOYSA-N 0.000 claims description 6
- HRPVXLWXLXDGHG-UHFFFAOYSA-N Acrylamide Chemical compound NC(=O)C=C HRPVXLWXLXDGHG-UHFFFAOYSA-N 0.000 claims description 6
- ROOXNKNUYICQNP-UHFFFAOYSA-N ammonium persulfate Chemical group [NH4+].[NH4+].[O-]S(=O)(=O)OOS([O-])(=O)=O ROOXNKNUYICQNP-UHFFFAOYSA-N 0.000 claims description 6
- SMZOUWXMTYCWNB-UHFFFAOYSA-N 2-(2-methoxy-5-methylphenyl)ethanamine Chemical compound COC1=CC=C(C)C=C1CCN SMZOUWXMTYCWNB-UHFFFAOYSA-N 0.000 claims description 5
- NIXOWILDQLNWCW-UHFFFAOYSA-N 2-Propenoic acid Natural products OC(=O)C=C NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 claims description 5
- LZZYPRNAOMGNLH-UHFFFAOYSA-M Cetrimonium bromide Chemical compound [Br-].CCCCCCCCCCCCCCCC[N+](C)(C)C LZZYPRNAOMGNLH-UHFFFAOYSA-M 0.000 claims description 5
- 230000001105 regulatory effect Effects 0.000 claims description 5
- 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 claims description 4
- USHAGKDGDHPEEY-UHFFFAOYSA-L potassium persulfate Chemical compound [K+].[K+].[O-]S(=O)(=O)OOS([O-])(=O)=O USHAGKDGDHPEEY-UHFFFAOYSA-L 0.000 claims description 4
- OZAIFHULBGXAKX-UHFFFAOYSA-N 2-(2-cyanopropan-2-yldiazenyl)-2-methylpropanenitrile Chemical compound N#CC(C)(C)N=NC(C)(C)C#N OZAIFHULBGXAKX-UHFFFAOYSA-N 0.000 claims description 3
- DXPPIEDUBFUSEZ-UHFFFAOYSA-N 6-methylheptyl prop-2-enoate Chemical compound CC(C)CCCCCOC(=O)C=C DXPPIEDUBFUSEZ-UHFFFAOYSA-N 0.000 claims description 3
- 229910001870 ammonium persulfate Inorganic materials 0.000 claims description 3
- TVTLCZHNZKWYBL-UHFFFAOYSA-N methyl 3-methylbut-3-enoate Chemical compound COC(=O)CC(C)=C TVTLCZHNZKWYBL-UHFFFAOYSA-N 0.000 claims description 3
- ZODWTWYKYYGSFS-UHFFFAOYSA-N diphenyl-bis(prop-2-enyl)silane Chemical compound C=1C=CC=CC=1[Si](CC=C)(CC=C)C1=CC=CC=C1 ZODWTWYKYYGSFS-UHFFFAOYSA-N 0.000 claims description 2
- AUTCCPQKLPMHDN-ONEGZZNKSA-N methyl (e)-3-methoxyprop-2-enoate Chemical compound CO\C=C\C(=O)OC AUTCCPQKLPMHDN-ONEGZZNKSA-N 0.000 claims description 2
- ZBUXMZFLCYRTOB-UHFFFAOYSA-N n-methylprop-2-enamide Chemical compound CNC(=O)C=C.CNC(=O)C=C ZBUXMZFLCYRTOB-UHFFFAOYSA-N 0.000 claims description 2
- 230000035484 reaction time Effects 0.000 claims description 2
- SFVFIFLLYFPGHH-UHFFFAOYSA-M stearalkonium chloride Chemical compound [Cl-].CCCCCCCCCCCCCCCCCC[N+](C)(C)CC1=CC=CC=C1 SFVFIFLLYFPGHH-UHFFFAOYSA-M 0.000 claims description 2
- 229920000642 polymer Polymers 0.000 abstract description 33
- 230000007613 environmental effect Effects 0.000 abstract description 10
- 230000007547 defect Effects 0.000 abstract description 4
- 238000007334 copolymerization reaction Methods 0.000 abstract description 2
- 230000000052 comparative effect Effects 0.000 description 17
- 230000001965 increasing effect Effects 0.000 description 11
- 239000012153 distilled water Substances 0.000 description 10
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 description 8
- 230000008569 process Effects 0.000 description 8
- 239000004927 clay Substances 0.000 description 7
- 230000000694 effects Effects 0.000 description 7
- 239000003921 oil Substances 0.000 description 7
- 229920003023 plastic Polymers 0.000 description 7
- 239000004033 plastic Substances 0.000 description 7
- 239000000243 solution Substances 0.000 description 7
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 6
- 229920001282 polysaccharide Polymers 0.000 description 6
- 239000005017 polysaccharide Substances 0.000 description 6
- 238000012360 testing method Methods 0.000 description 6
- 230000032683 aging Effects 0.000 description 5
- 239000007789 gas Substances 0.000 description 5
- 239000002245 particle Substances 0.000 description 5
- 239000002318 adhesion promoter Substances 0.000 description 4
- -1 amino acid ester Chemical class 0.000 description 4
- 230000015572 biosynthetic process Effects 0.000 description 4
- 238000011161 development Methods 0.000 description 4
- 230000018109 developmental process Effects 0.000 description 4
- 150000004676 glycans Chemical class 0.000 description 4
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 4
- 229910052757 nitrogen Inorganic materials 0.000 description 4
- 231100000252 nontoxic Toxicity 0.000 description 4
- 230000003000 nontoxic effect Effects 0.000 description 4
- 235000019198 oils Nutrition 0.000 description 4
- 239000003208 petroleum Substances 0.000 description 4
- 239000000047 product Substances 0.000 description 4
- 239000011780 sodium chloride Substances 0.000 description 4
- FHVDTGUDJYJELY-UHFFFAOYSA-N 6-{[2-carboxy-4,5-dihydroxy-6-(phosphanyloxy)oxan-3-yl]oxy}-4,5-dihydroxy-3-phosphanyloxane-2-carboxylic acid Chemical compound O1C(C(O)=O)C(P)C(O)C(O)C1OC1C(C(O)=O)OC(OP)C(O)C1O FHVDTGUDJYJELY-UHFFFAOYSA-N 0.000 description 3
- 229940072056 alginate Drugs 0.000 description 3
- 229920000615 alginic acid Polymers 0.000 description 3
- 235000010443 alginic acid Nutrition 0.000 description 3
- 239000003795 chemical substances by application Substances 0.000 description 3
- 239000002244 precipitate Substances 0.000 description 3
- 239000002994 raw material Substances 0.000 description 3
- 239000002002 slurry Substances 0.000 description 3
- 125000000542 sulfonic acid group Chemical group 0.000 description 3
- 238000003786 synthesis reaction Methods 0.000 description 3
- 241000894006 Bacteria Species 0.000 description 2
- 239000011837 N,N-methylenebisacrylamide Substances 0.000 description 2
- 125000003342 alkenyl group Chemical group 0.000 description 2
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 238000004132 cross linking Methods 0.000 description 2
- 238000011156 evaluation Methods 0.000 description 2
- 230000007062 hydrolysis Effects 0.000 description 2
- 238000006460 hydrolysis reaction Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- ZIUHHBKFKCYYJD-UHFFFAOYSA-N n,n'-methylenebisacrylamide Chemical compound C=CC(=O)NCNC(=O)C=C ZIUHHBKFKCYYJD-UHFFFAOYSA-N 0.000 description 2
- 239000003345 natural gas Substances 0.000 description 2
- 239000001301 oxygen Substances 0.000 description 2
- 229910052760 oxygen Inorganic materials 0.000 description 2
- 239000003209 petroleum derivative Substances 0.000 description 2
- 125000001997 phenyl group Chemical group [H]C1=C([H])C([H])=C(*)C([H])=C1[H] 0.000 description 2
- 238000006116 polymerization reaction Methods 0.000 description 2
- 239000011148 porous material Substances 0.000 description 2
- 239000011435 rock Substances 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 125000001273 sulfonato group Chemical group [O-]S(*)(=O)=O 0.000 description 2
- 229920000855 Fucoidan Polymers 0.000 description 1
- 241000199919 Phaeophyceae Species 0.000 description 1
- BAPJBEWLBFYGME-UHFFFAOYSA-N acrylic acid methyl ester Natural products COC(=O)C=C BAPJBEWLBFYGME-UHFFFAOYSA-N 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 150000001336 alkenes Chemical class 0.000 description 1
- 150000001450 anions Chemical class 0.000 description 1
- 230000001580 bacterial effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000000440 bentonite Substances 0.000 description 1
- 229910000278 bentonite Inorganic materials 0.000 description 1
- SVPXDRXYRYOSEX-UHFFFAOYSA-N bentoquatam Chemical compound O.O=[Si]=O.O=[Al]O[Al]=O SVPXDRXYRYOSEX-UHFFFAOYSA-N 0.000 description 1
- 125000003178 carboxy group Chemical group [H]OC(*)=O 0.000 description 1
- 150000001768 cations Chemical class 0.000 description 1
- 239000013043 chemical agent Substances 0.000 description 1
- 239000008367 deionised water Substances 0.000 description 1
- 229910021641 deionized water Inorganic materials 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000010556 emulsion polymerization method Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000002708 enhancing effect Effects 0.000 description 1
- 229920000578 graft copolymer Polymers 0.000 description 1
- 150000008282 halocarbons Chemical class 0.000 description 1
- 150000005826 halohydrocarbons Chemical class 0.000 description 1
- 230000000887 hydrating effect Effects 0.000 description 1
- 125000002887 hydroxy group Chemical group [H]O* 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 239000000314 lubricant Substances 0.000 description 1
- 238000004020 luminiscence type Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- HMZGPNHSPWNGEP-UHFFFAOYSA-N octadecyl 2-methylprop-2-enoate Chemical compound CCCCCCCCCCCCCCCCCCOC(=O)C(C)=C HMZGPNHSPWNGEP-UHFFFAOYSA-N 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 239000003973 paint Substances 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- 229920000447 polyanionic polymer Polymers 0.000 description 1
- 238000000197 pyrolysis Methods 0.000 description 1
- 238000005956 quaternization reaction Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000000518 rheometry Methods 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 239000011734 sodium Substances 0.000 description 1
- HPALAKNZSZLMCH-UHFFFAOYSA-M sodium;chloride;hydrate Chemical class O.[Na+].[Cl-] HPALAKNZSZLMCH-UHFFFAOYSA-M 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- BDHFUVZGWQCTTF-UHFFFAOYSA-M sulfonate Chemical compound [O-]S(=O)=O BDHFUVZGWQCTTF-UHFFFAOYSA-M 0.000 description 1
- 239000000725 suspension Substances 0.000 description 1
- 230000002195 synergetic effect Effects 0.000 description 1
- 230000001988 toxicity Effects 0.000 description 1
- 231100000419 toxicity Toxicity 0.000 description 1
- 235000015112 vegetable and seed oil Nutrition 0.000 description 1
- 239000008158 vegetable oil Substances 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Classifications
-
- 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
- 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
- C09K8/03—Specific additives for general use in well-drilling compositions
- C09K8/035—Organic additives
-
- 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
Abstract
The invention provides an environment-friendly high-temperature-resistant saturated salt-resistant tackifier for water-based drilling fluid, and a preparation method and application thereof. The preparation method of the tackifier comprises the following steps: adding vinyl monomers into water, adjusting the pH of the system to 7-8, adding sodium alginate, and stirring for dissolution to obtain a water phase A; adding a cationic surfactant and a hydrophobic monomer into water, and uniformly stirring to obtain a water phase B; mixing and stirring the water phase A and the water phase B uniformly, adding a cross-linking agent, heating to a reaction temperature, and adding an initiator to react; after the reaction is finished, the preparation method comprises the steps of filtering, washing, drying and crushing. According to the invention, the vinyl monomer and the hydrophobic monomer are used for graft copolymerization of sodium alginate, so that the temperature resistance and salt resistance of the sodium alginate are improved, and meanwhile, good biodegradability and environmental protection are maintained. The tackifier is an environment-friendly polymer tackifier resisting high temperature of 200 ℃, and overcomes the defects of environment-friendly type and insufficient high-temperature high-salt stability of the traditional water-based drilling fluid polymer tackifier.
Description
Technical Field
The invention relates to an environment-friendly high-temperature-resistant saturated salt-resistant tackifier for water-based drilling fluid, and a preparation method and application thereof, belonging to the field of oilfield chemistry in petroleum industry.
Background
The petroleum and natural gas resources are closely related to the development of national economic construction, along with the rapid development of national economic construction, the energy demand for petroleum and the like is gradually increased, and the development of petroleum and natural gas gradually advances from a conventional stratum to an unconventional complex stratum. Deep and ultra-deep complex geological conditions are always the focus of problems of exploration and development, and a drilling fluid system capable of adapting to high-temperature high-pressure complex underground conditions and a treating agent thereof become one of key technologies for guaranteeing deep well and ultra-deep well drilling and completion.
In the deep ultra-deep oil and gas reservoir drilling process, submicron clay particles in drilling fluid easily invade reservoir pores and microcracks to cause blockage of oil and gas channels of the reservoir, damage to the oil and gas reservoir is caused, and the drilling difficulty of the stratum with strong water sensitivity and the shale stratum easy to hydrate and damage is usually solved by adopting oil-based drilling fluid. However, the use of oil-based drilling fluids is often accompanied by a large amount of pollution problems during the use process, and the use of oil-based drilling fluids is greatly limited.
The clay-free/low-earth-phase drilling fluid system contains no or very little clay particles, so that the problem of blockage of pores of an oil-gas channel of a reservoir caused by clay solid-phase particles in the drilling fluid is avoided, the mechanical drilling speed in the drilling process is improved, the drilling and completion period is shortened, and a certain protection effect can be provided for the drilling and the production of the reservoir. However, as the drilling fluid does not contain clay or has low clay content, a tackifier must be added into the drilling fluid to solve the problem of carrying and suspending rock debris in the drilling process.
The tackifier for adjusting the rheological property of the water-based drilling fluid is one of core treatment agents of the high-temperature-resistant drilling fluid, is mainly used as a high-molecular polymer tackifier at present, and the main tackifying mechanism is that polymer molecules form a grid structure through bridging action to improve the viscosity of the drilling fluid. The temperature resistance of the polymer tackifier is closely related to the molecular structure of the polymer tackifier, and the molecular structure of the polymer is optimized to obviously improve the temperature resistance of the tackifier, and the main optimization mode is as follows: (1) The primary molecular structure should be selected from monomers with C-C, C-N and C-S bonds as the main chain; (2) The secondary structure has a certain branched structure and a certain body type structure; (3) selecting monomers having hydrolysis-resistant and rigid groups.
Chinese patent document CN114805678A discloses a tackifier for drilling fluid and a preparation method thereof, wherein unsaturated amino acid ester and halohydrocarbon are subjected to quaternization reaction to obtain a hydrophobic monomer, and the hydrophobic monomer, acrylamide, acrylic acid and sulfonic acid group monomer are usedThe body and the like are polymerized to obtain the tackifier with the temperature resistance of 200 ℃, but the tackifier uses unsaturated amino acid ester and halogenated hydrocarbon in synthesis, and has lower environmental protection performance. Chinese patent document CN114805680A discloses a preparation method of a temperature-resistant and salt-resistant tackifier, wherein an alkene monomer, an anion monomer and a cation monomer are used for preparing the tackifier with the temperature resistance of 180 ℃ and 15% NaCl by an emulsion polymerization method, and the tackifier prepared by the method can meet the requirements of enterprise standards in environmental protection performance, but still needs to be matched with 4% of base slurry in the use process, and is not suitable for a no/low solid phase drilling fluid system. Chinese patent CN115537190a provides a drilling fluid comprising fucoidan, alginate, vegetable oil lubricant, KCl, na, and the use thereof 2 CO 3 And water, solve the problems that the existing solid-free drilling fluid has toxicity, cannot degrade materials, has poor suspension property, is unfavorable for carrying rocks and the like. However, brown seaweed polysaccharide and alginate used in the drilling fluid have the problem of insufficient temperature resistance and salt resistance.
Therefore, the tackifier which is applicable to the high-temperature-resistant and salt-resistant water-based drilling fluid system, has excellent tackifying performance on water-based drilling fluid and is nontoxic and easy to biodegrade is developed, and has great significance on deep ultra-deep oil-gas reservoir drilling.
Disclosure of Invention
Aiming at the defects of the prior art, in particular to the defects of the tackifier for the prior non/low solid phase water-based drilling fluid: (1) The environmental protection performance is not enough, the environmental protection performance requirement of China on the treating agent for oil fields is more and more strict, and the pollution of the waste liquid of the existing drilling fluid is large, and the treatment cost is high; (2) The high-temperature and high-salt resistance is insufficient, the capability of the conventional environment-friendly drilling fluid tackifier in high-temperature and high-salt resistance is insufficient to a certain extent, and the tackifier is easy to lose efficacy under the high-temperature and high-salt condition. The invention provides an environment-friendly high-temperature-resistant saturated salt-resistant tackifier for water-based drilling fluid, and a preparation method and application thereof. According to the invention, the vinyl monomer and the hydrophobic monomer are used for graft copolymerization of the natural high polymer polysaccharide sodium alginate, so that the temperature resistance and salt resistance of the natural high polymer polysaccharide sodium alginate are improved, and meanwhile, good biodegradability and environmental protection are maintained. The tackifier is an environment-friendly polymer tackifier resisting high temperature of 200 ℃, and overcomes the defects of environment-friendly type and insufficient high-temperature high-salt stability of the traditional water-based drilling fluid polymer tackifier.
The technical scheme of the invention is as follows:
the preparation method of the environment-friendly high-temperature-resistant saturated salt-resistant tackifier for the water-based drilling fluid comprises the following steps:
(1) Adding vinyl monomers into water, adjusting the pH of the system to 7-8, adding sodium alginate, and stirring for dissolution to obtain a water phase A;
(2) Adding a cationic surfactant and a hydrophobic monomer into water, and uniformly stirring to obtain a water phase B;
(3) Mixing and stirring the water phase A and the water phase B uniformly, adding a cross-linking agent, heating to a reaction temperature, and adding an initiator to react; after the reaction is finished, the environment-friendly high-temperature-resistant and saturated-resistant salt tackifier for the water-based drilling fluid is obtained through filtration, washing, drying and crushing.
According to the invention, preferably, the vinyl monomer in the step (1) is a combination of a monomer I and a monomer II, wherein the monomer I is acrylamide and/or acrylic acid, the monomer II is sodium styrene sulfonate and/or 2-acrylamide-2-methylpropanesulfonic acid, and the mass ratio of the monomer I to the monomer II is 1:0.3-1.5; the ratio of the mass of the vinyl monomer to the volume of water is 0.1-1 g/1 mL.
According to the invention, in the step (1), the pH of the system is regulated by using 30-50% NaOH aqueous solution by mass fraction.
According to the invention, preferably, the mass ratio of the sodium alginate to the vinyl monomer in the step (1) is 0.1-0.5:1; the number average molecular weight of the sodium alginate is 20000-30000.
According to a preferred embodiment of the present invention, the cationic surfactant in step (2) is one or a combination of two of cetyltrimethylammonium bromide and octadecyldimethylbenzyl ammonium chloride; the mass ratio of the cationic surfactant to the hydrophobic monomer is 0.05-0.2:1.
Preferably according to the invention, the hydrophobic monomer in step (2) is isooctyl acrylate, methyl 3-methyl-3-butenoate or methyl 3-methoxy acrylate; the ratio of the mass of the hydrophobic monomer to the volume of water is 2-8 g/50 mL.
According to the invention, the mass ratio of the hydrophobic monomer in the water phase B to the sodium alginate in the water phase A in the step (3) is 0.5-1:1.
According to a preferred embodiment of the present invention, the crosslinking agent in the step (3) is one or a combination of two or more of divinylbenzene, diallyl diphenylsilane, and N, N-dimethyl bisacrylamide; the mass of the cross-linking agent is 0.1-0.5% of the total mass of the vinyl monomer, sodium alginate and the hydrophobic monomer.
Preferably according to the invention, the initiator in step (3) is ammonium persulfate, potassium persulfate or azobisisobutyronitrile; the mass of the initiator is 0.05 to 0.3 percent of the total mass of the vinyl monomer, the sodium alginate and the hydrophobic monomer.
According to a preferred embodiment of the present invention, the reaction temperature in step (3) is 45 to 55 ℃; the reaction time is 4-6 h.
Preferably according to the present invention, the washing in step (3) is washing 3 to 5 times with water; the drying is carried out for 8-12 h at 70-85 ℃.
The invention also provides an environment-friendly high-temperature-resistant and saturated-salt-resistant tackifier for water-based drilling fluid, which is prepared by adopting the preparation method.
According to the invention, the environment-friendly high-temperature-resistant and saturated-salt-resistant tackifier for the water-based drilling fluid is applied to the water-based drilling fluid without/with low solid phase.
The invention has the technical characteristics and beneficial effects that:
1. the tackifier of the invention has excellent temperature resistance and salt resistance, and has stable performance under the condition of high temperature of 200 ℃ and saturated salt addition. The synthesized tackifier grafts natural high molecular polysaccharide polymer, and the molecular structure contains C-C molecular chains and sulfonic acid groups, and the C-C molecular long chains can increase the temperature resistance of the molecules; at the same time, the introduction of sulfonic acid groups also increases the hydrolysis and salt resistance of the adhesion promoters.
2. The tackifier has good environmental protection performance, the raw materials used by the tackifier are natural high molecular polysaccharide polymer alginate, the EC50 is more than 30000ppm, the BOD5/CODCr is more than 25%, and the tackifier is nontoxic and is easy to biodegrade.
3. According to the invention, the natural high molecular polysaccharide polymer sodium alginate is grafted, so that the sodium alginate has good biocompatibility and degradability, contains a large amount of-COO-, can show polyanion behavior in an aqueous solution, has certain adhesiveness, and has the advantages of increased hydrophilicity of the sodium alginate, expanded molecular chains, increased steric hindrance, increased free water flowing resistance in drilling fluid, increased viscosity of a system, small consumption and good tackifying effect when the pH value is increased.
4. The tackifier of the invention introduces long-chain hydrophobic monomers with specific length in the synthesis process, the polar hydrophobic chains can enable the macromolecular chains of the tackifier to be in an extended state, and the intermolecular hydrophobic association enables the macromolecular chains to be physically crosslinked to form a space network structure with certain strength, so that the tackifier has strong tackifying capability, and meanwhile, the hydrophobic long chains can also increase the thermal stability of the tackifier.
5. The tackifier of the invention adds a small amount of cross-linking agent in the synthesis process, so that the alkenyl monomers are slightly cross-linked, the polymerization degree of molecular chains can be increased, the structural strength of molecules is enhanced, and the temperature resistance and the tackifying effect of the molecules are enhanced.
Detailed Description
The invention is further illustrated by, but not limited to, the following specific examples.
The raw materials used in the examples are all conventional raw materials and are commercially available; the methods are prior art unless specified otherwise.
The sodium alginate used in the examples has a number average molecular weight of 25000.
Example 1
The preparation method of the environment-friendly high-temperature-resistant saturated salt-resistant tackifier for the water-based drilling fluid comprises the following steps:
(1) 15g of acrylamide and 10g of 2-acrylamide-2-methylpropanesulfonic acid are added into 50mL of distilled water, the pH of the system is regulated to 8 by using 40% NaOH aqueous solution, 5g of sodium alginate is added into the solution, and stirring is continued until the solution is completely dissolved, so as to obtain a water phase A;
(2) Adding 0.3g of cetyltrimethylammonium bromide into 50mL of distilled water, continuously stirring, slowly adding 3g of isooctyl acrylate, and uniformly stirring to obtain a water phase B;
(3) Uniformly mixing and stirring the water phase A obtained in the step (1) and the water phase B obtained in the step (2), adding 0.05g of a cross-linking agent N, N-methylene bisacrylamide, heating to 45 ℃, adding 0.03g of an initiator ammonium persulfate, continuously stirring, introducing nitrogen for 30min, and reacting for 4h at 45 ℃; after the reaction is finished, filtering, washing the obtained product with distilled water for 3 times, drying the obtained precipitate for 10 hours at 70 ℃, and crushing to obtain the environment-friendly high-temperature-resistant and saturation-resistant salt tackifier for water-based drilling fluid.
Example 2
The preparation method of the environment-friendly high-temperature-resistant saturated salt-resistant tackifier for the water-based drilling fluid comprises the following steps:
(1) 10g of acrylamide, 8g of 2-acrylamide-2-methylpropanesulfonic acid and 5g of sodium styrenesulfonate are added into 50mL of distilled water, the pH of the system is regulated to 7 by using 40% NaOH aqueous solution, 5g of sodium alginate is added into the solution, and stirring is continued until the solution is completely dissolved, so as to prepare a water phase A;
(2) Adding 0.4g of cetyltrimethylammonium bromide into 50mL of distilled water, continuously stirring, slowly adding 4g of 3-methyl-3-butenoic acid methyl ester, and uniformly stirring to obtain a water phase B;
(3) Uniformly mixing and stirring the water phase A obtained in the step (1) and the water phase B obtained in the step (2), adding 0.07g of a crosslinking agent divinylbenzene, heating to 50 ℃, adding 0.05g of an initiator potassium persulfate, continuously stirring, introducing nitrogen for 30min, and reacting for 5h at 50 ℃; after the reaction is finished, filtering, washing the obtained product with distilled water for 3 times, drying the obtained precipitate for 10 hours at 80 ℃, and crushing to obtain the environment-friendly high-temperature-resistant and saturation-resistant salt tackifier for water-based drilling fluid.
Example 3
The preparation method of the environment-friendly high-temperature-resistant saturated salt-resistant tackifier for the water-based drilling fluid comprises the following steps:
(1) Adding 10g of acrylic acid and 5g of sodium styrenesulfonate into 50mL of distilled water, regulating the pH of the system to 8 by using a 40% NaOH aqueous solution, adding 5g of sodium alginate into the solution, and continuously stirring until the sodium alginate is completely dissolved to prepare a water phase A;
(2) Adding 0.4g of cetyltrimethylammonium bromide into 50mL of distilled water, continuously stirring, slowly adding 3g of 3-methoxy methyl acrylate, and uniformly stirring to obtain a water phase B;
(3) Uniformly mixing and stirring the water phase A obtained in the step (1) and the water phase B obtained in the step (2), adding 0.08g of a cross-linking agent N, N-methylene bisacrylamide, heating to 50 ℃, adding 0.03g of an initiator potassium persulfate, continuously stirring, introducing nitrogen for 30min, and reacting for 6h at 50 ℃; after the reaction is finished, filtering, washing the obtained product with distilled water for 3 times, drying the obtained precipitate for 12 hours at 75 ℃, and crushing to obtain the environment-friendly high-temperature-resistant and saturated-salt-resistant tackifier for water-based drilling fluid.
Example 4
The preparation method of the environment-friendly high-temperature-resistant saturated salt-resistant tackifier for water-based drilling fluid is as described in example 1, except that: 8g of acrylic acid and 4g of sodium styrenesulfonate are added in the step (1).
Example 5
The preparation method of the environment-friendly high-temperature-resistant saturated salt-resistant tackifier for water-based drilling fluid is as described in example 1, except that: the amount of the crosslinking agent added in the step (3) was 0.1g.
Comparative example 1
A method for preparing a tackifier for water-based drilling fluids is described in example 1, except that: the vinyl monomer in step (1) is only 25g of acrylamide.
Comparative example 2
A method for preparing a tackifier for water-based drilling fluids is described in example 1, except that: the hydrophobic monomer is not added in the step (2).
Comparative example 3
A method for preparing a tackifier for water-based drilling fluids is described in example 1, except that: and (3) adding no cross-linking agent in the step (3).
Comparative example 4
A method for preparing a tackifier for water-based drilling fluids is described in example 1, except that: the hydrophobic monomer in step (2) was 8g.
Comparative example 5
A method for preparing a tackifier for water-based drilling fluids is described in example 1, except that: the vinyl monomer in the step (1) is only 25g of sodium styrene sulfonate.
Comparative example 6
A method for preparing a tackifier for water-based drilling fluids is described in example 1, except that: the hydrophobic monomer added in the step (2) is octadecyl methacrylate.
Comparative example 7
A method for preparing a tackifier for water-based drilling fluids is described in example 1, except that: the amount of the crosslinking agent added in the step (3) was 0.2g.
Test examples
The following performance evaluations were performed on the prepared tackifiers:
(1) Effect of viscosifiers on rheological parameters of drilling fluids
The rheology parameters (apparent viscosity, plastic viscosity, dynamic shear) were measured for the tackifiers prepared according to the American Petroleum Institute (API) standard (API RP 13B-1,2009).
Adding a tackifier sample into deionized water to obtain a sample aqueous solution with the mass fraction of 1%, and then respectively testing the apparent viscosity, plastic viscosity and dynamic shear force of the aqueous solution system at room temperature, and the apparent viscosity, plastic viscosity and dynamic shear force after aging, which are measured at room temperature after aging for 16 hours at 180 ℃. The results are shown in Table 1.
TABLE 1
As can be seen from Table 1, from the data of examples and comparative examples, the vinyl monomers, hydrophobic monomers, and crosslinking agents act synergistically in the polymer molecule, and the absence of either monomer reduces the performance of the resulting polymer tackifier. It was found from example 1 and comparative example 1 that the introduction of sulfonate-containing vinyl monomers increased the temperature resistance of the polymer. As can be seen from examples 1 and 2, sodium styrenesulfonate can enhance the rigidity of molecular chains due to the benzene ring, so that the space structure formed by the polymer is not easy to deform and shrink to lose effectiveness at high temperature, and the tackifying effect is good. As is clear from comparative examples 2 and 4, the presence or absence of the hydrophobic effect on the tackifier properties is large, long-chain hydrophobic monomers can cause the tackifier macromolecular chains to be in an extended state in the polymer, and the intermolecular hydrophobic association causes the macromolecular chains to be physically crosslinked to form a space network structure with a certain strength, so that the tackifier has a strong tackifying capability, and as is clear from comparative example 6, the long-chain hydrophobic monomers have an obvious tackifying effect, but also reduce the temperature resistance of the polymer and are easy to fail at a high temperature. As can be seen from the comparison of example 1 and example 5, the cross-linking structure between vinyl monomers can be more easily caused by increasing the amount of the cross-linking agent, and the stability of the structure of the tackifier in water and the resistance to pyrolysis are improved. Comparative example 3, in which no crosslinking agent was added, showed a significant decrease in performance at high temperature. As is clear from comparative example 7, increasing the amount of the crosslinking agent increases the molecular space structure, increases the temperature resistance, and increases the temperature resistance of the polymer, but at the same time, the chain-like molecular length is reduced due to the network formation of the polymer, and the viscosity increase is not significant. As is evident from comparative example 5, the polymer was less effective in tackifying by using only sodium styrenesulfonate.
(2) Tackifier temperature and salt resistance test
The tackifiers prepared in examples and comparative examples were added to a saturated aqueous NaCl solution to obtain an aqueous saline solution of a sample having a mass fraction of 1%, and then the apparent viscosity, plastic viscosity, dynamic shear force at room temperature of the aqueous saline system, and the apparent viscosity, plastic viscosity, dynamic shear force after aging measured at room temperature after aging at 180 ℃ for 16 hours were respectively tested. The results are shown in Table 2.
TABLE 2
As can be seen from the data changes of the examples and the comparative examples, the performance of the examples of the invention is reduced to some extent after saturated brine is added, but the stability can be maintained within a certain range, but the data fluctuation of the comparative examples is obvious, the performance reduction is rapid, and the invention shows that the vinyl monomer, the hydrophobic monomer and the cross-linking agent in the synthetic process of the environment-friendly temperature-resistant and saturated salt tackifier have synergistic effect in polymer molecules, and the loss of any monomer can reduce the performance of the synthesized polymer tackifier. It can be found from examples 1 and 1 that the sulfonate groups are introduced into the polymer to enhance the temperature resistance and salt resistance of the polymer, and examples 2 and 3 show that sodium styrenesulfonate has a rigid molecular structure to enhance the salt resistance of the polymer, and benzene rings enhance the rigidity strength of side chains of polymer molecules, so that the polymer is not easy to shrink and deform in a high-temperature and high-salt environment, and can be stretched in water to form a structure to increase the solution viscosity. It can be seen from examples 5 and 3 that the use of the crosslinking agent can cause light crosslinking between the alkenyl monomers, increase the polymerization degree of the molecular chain, and enhance the structural strength of the molecule, the temperature resistance and the tackifying effect of the molecule.
(3) Viscosity enhancing energy in low solids drilling fluids
Preparing 2% low solid phase base slurry: 8g of bentonite and 0.32g of Na were slowly added to 400mL of distilled water with stirring 2 CO 3 Then hydrating for 24 hours at room temperature to prepare 2% low solid phase base slurry, adding NaCl to saturation, adding tackifier with mass fraction of 2% into the low solid phase saturated salt system, and then testing the apparent viscosity, plastic viscosity and dynamic shear force of the low solid phase system at room temperature and the apparent viscosity, plastic viscosity and dynamic shear force after aging at 200 ℃ for 16 hours at room temperature. The results are shown in Table 3.
TABLE 3 Table 3
In the low solid phase drilling fluid, clay particles are negatively charged, the negatively charged groups in the tackifier enhance the dispersibility of the clay particles through electrostatic repulsion, meanwhile, the tackifier is well dissolved in a low solid phase saturated salt system, the carboxyl and hydroxyl groups of hydrophilic groups ensure the long chain extension of a polymer, the steric hindrance is large, the viscosity of the system is favorably increased, the Wen Jituan sulfonate groups enable the polymer to have good temperature resistance, and meanwhile, the polymer tackifier is slightly crosslinked to synergistically increase the temperature resistance of the grafted polymer tackifier.
(4) Environmental protection performance test
The environmental protection performance of the material is rated according to the medium petroleum group standard Q/SY 111-2007 oilfield chemical agent, drilling fluid biotoxicity grading and detection method luminescence bacterial method. Testing the biotoxicity of the adhesion promoter by means of a luminescent bacterium, so that the concentration EC of the substance to be evaluated is reduced by half by the luminous capacity of the luminescent bacterium 50 For evaluation index, EC 50 Values greater than 25000 indicate that the adhesion promoter is non-toxic. The BOD5/CODCr ratio was calculated by testing the chemical oxygen demand (CODCr) and biological oxygen demand (BOD 5) values of the tackifiers. The greater the BOD/COD value, the better the biodegradability of the adhesion promoter. The results are shown in Table 4.
TABLE 4 Table 4
| Sample of | EC 50 (mg/L) | Grade of biodegradability |
| Example 1 | 59145 | Is easy to degrade |
| Example 2 | 53562 | Is easy to degrade |
| Example 3 | 57754 | Is easy to degrade |
| Example 4 | 48952 | Is easy to degrade |
| Example 5 | 47845 | Is easy to degrade |
As shown in Table 4, the products EC of each example 50 More than 25000ppm, is easy to biodegrade, and shows that the paint is nontoxic, easy to biodegrade and has good environmental protection performance.
In conclusion, the environment-friendly high-temperature-resistant saturated salt-resistant tackifier disclosed by the invention has excellent performance, and can meet the existing drilling requirements and meet the environment-friendly requirements.
Claims (10)
1. The preparation method of the environment-friendly high-temperature-resistant saturated salt-resistant tackifier for the water-based drilling fluid comprises the following steps:
(1) Adding vinyl monomers into water, adjusting the pH of the system to 7-8, adding sodium alginate, and stirring for dissolution to obtain a water phase A;
(2) Adding a cationic surfactant and a hydrophobic monomer into water, and uniformly stirring to obtain a water phase B;
(3) Mixing and stirring the water phase A and the water phase B uniformly, adding a cross-linking agent, heating to a reaction temperature, and adding an initiator to react; after the reaction is finished, the environment-friendly high-temperature-resistant and saturated-resistant salt tackifier for the water-based drilling fluid is obtained through filtration, washing, drying and crushing.
2. The preparation method of the environment-friendly high-temperature-resistant saturated salt-resistant tackifier for the water-based drilling fluid, which is characterized in that in the step (1), the vinyl monomer is a combination of a monomer I and a monomer II, wherein the monomer I is acrylamide and/or acrylic acid, the monomer II is sodium styrene sulfonate and/or 2-acrylamide-2-methylpropanesulfonic acid, and the mass ratio of the monomer I to the monomer II is 1:0.3-1.5; the ratio of the mass of the vinyl monomer to the volume of water is 0.1-1 g/1 mL.
3. The method for preparing the environment-friendly high-temperature-resistant saturated salt-resistant tackifier for the water-based drilling fluid, which is characterized in that in the step (1), naOH aqueous solution with the mass fraction of 30-50% is used for regulating the pH of a system;
the mass ratio of the sodium alginate to the vinyl monomer is 0.1-0.5:1; the number average molecular weight of the sodium alginate is 20000-30000.
4. The method for preparing an environment-friendly high-temperature-resistant saturated salt-resistant tackifier for water-based drilling fluids according to claim 1, wherein the cationic surfactant in the step (2) is one or a combination of two of cetyl trimethyl ammonium bromide and stearyl dimethyl benzyl ammonium chloride; the mass ratio of the cationic surfactant to the hydrophobic monomer is 0.05-0.2:1.
5. The method for preparing an environment-friendly high-temperature-resistant saturated salt-resistant tackifier for water-based drilling fluids according to claim 1, wherein the hydrophobic monomer in the step (2) is isooctyl acrylate, methyl 3-methyl-3-butenoate or methyl 3-methoxy acrylate; the ratio of the mass of the hydrophobic monomer to the volume of water is 2-8 g/50 mL.
6. The method for preparing the environment-friendly high-temperature-resistant saturated salt-resistant tackifier for water-based drilling fluid, according to claim 1, wherein the mass ratio of the hydrophobic monomer in the water phase B to the sodium alginate in the water phase A in the step (3) is 0.5-1:1.
7. The method for preparing an environment-friendly high-temperature-resistant saturated salt-resistant tackifier for water-based drilling fluids according to claim 1, wherein the cross-linking agent in the step (3) is one or a combination of more than two of divinylbenzene, diallyl diphenylsilane or N, N-dimethyl bisacrylamide; the mass of the cross-linking agent is 0.1-0.5% of the total mass of the vinyl monomer, sodium alginate and hydrophobic monomer;
the initiator is ammonium persulfate, potassium persulfate or azodiisobutyronitrile; the mass of the initiator is 0.05 to 0.3 percent of the total mass of the vinyl monomer, the sodium alginate and the hydrophobic monomer.
8. The method for preparing an environment-friendly high-temperature-resistant saturated salt-resistant tackifier for water-based drilling fluids according to claim 1, wherein the reaction temperature in the step (3) is 45-55 ℃; the reaction time is 4-6 hours; the washing is carried out for 3-5 times by using water; the drying is carried out for 8-12 h at 70-85 ℃.
9. An environment-friendly high-temperature-resistant and saturated-salt-resistant tackifier for water-based drilling fluid, which is characterized by being prepared by the preparation method of claim 1.
10. The use of the environment-friendly high-temperature-resistant saturated salt-resistant tackifier for water-based drilling fluid according to claim 1 in a non/low solid-phase water-based drilling fluid.
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