CN114686190A - High-temperature-resistant and saturated-salt-resistant plugging fluid loss agent and preparation method thereof - Google Patents
High-temperature-resistant and saturated-salt-resistant plugging fluid loss agent and preparation method thereof Download PDFInfo
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- CN114686190A CN114686190A CN202111528444.9A CN202111528444A CN114686190A CN 114686190 A CN114686190 A CN 114686190A CN 202111528444 A CN202111528444 A CN 202111528444A CN 114686190 A CN114686190 A CN 114686190A
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- 238000002360 preparation method Methods 0.000 title claims abstract description 17
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 49
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims abstract description 32
- 150000003839 salts Chemical class 0.000 claims abstract description 28
- 239000003999 initiator Substances 0.000 claims abstract description 25
- 239000000377 silicon dioxide Substances 0.000 claims abstract description 23
- CSCPPACGZOOCGX-UHFFFAOYSA-N Acetone Chemical compound CC(C)=O CSCPPACGZOOCGX-UHFFFAOYSA-N 0.000 claims abstract description 22
- 229910052681 coesite Inorganic materials 0.000 claims abstract description 21
- 229910052906 cristobalite Inorganic materials 0.000 claims abstract description 21
- 229910052682 stishovite Inorganic materials 0.000 claims abstract description 21
- 229910052905 tridymite Inorganic materials 0.000 claims abstract description 21
- 239000000654 additive Substances 0.000 claims abstract description 20
- 230000000996 additive effect Effects 0.000 claims abstract description 20
- 238000001914 filtration Methods 0.000 claims abstract description 19
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 14
- HRPVXLWXLXDGHG-UHFFFAOYSA-N Acrylamide Chemical compound NC(=O)C=C HRPVXLWXLXDGHG-UHFFFAOYSA-N 0.000 claims abstract description 12
- GMSCBRSQMRDRCD-UHFFFAOYSA-N dodecyl 2-methylprop-2-enoate Chemical compound CCCCCCCCCCCCOC(=O)C(C)=C GMSCBRSQMRDRCD-UHFFFAOYSA-N 0.000 claims abstract description 11
- DBMJMQXJHONAFJ-UHFFFAOYSA-M Sodium laurylsulphate Chemical compound [Na+].CCCCCCCCCCCCOS([O-])(=O)=O DBMJMQXJHONAFJ-UHFFFAOYSA-M 0.000 claims abstract description 10
- 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 claims abstract description 8
- 239000006185 dispersion Substances 0.000 claims abstract description 7
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims description 40
- 238000003756 stirring Methods 0.000 claims description 32
- ZMANZCXQSJIPKH-UHFFFAOYSA-N Triethylamine Chemical group CCN(CC)CC ZMANZCXQSJIPKH-UHFFFAOYSA-N 0.000 claims description 27
- 239000007795 chemical reaction product Substances 0.000 claims description 15
- 238000005406 washing Methods 0.000 claims description 15
- 238000005303 weighing Methods 0.000 claims description 15
- 229920006395 saturated elastomer Polymers 0.000 claims description 12
- 239000000203 mixture Substances 0.000 claims description 11
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 10
- 238000006243 chemical reaction Methods 0.000 claims description 10
- 238000010438 heat treatment Methods 0.000 claims description 10
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 claims description 8
- 238000000034 method Methods 0.000 claims description 8
- 239000000047 product Substances 0.000 claims description 8
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 6
- 239000001301 oxygen Substances 0.000 claims description 6
- 229910052760 oxygen Inorganic materials 0.000 claims description 6
- 238000007605 air drying Methods 0.000 claims description 5
- 238000001035 drying Methods 0.000 claims description 5
- 235000019441 ethanol Nutrition 0.000 claims description 5
- 239000000463 material Substances 0.000 claims description 5
- 238000002156 mixing Methods 0.000 claims description 5
- 229910052757 nitrogen Inorganic materials 0.000 claims description 5
- 239000000376 reactant Substances 0.000 claims description 5
- 238000001291 vacuum drying Methods 0.000 claims description 5
- 238000010992 reflux Methods 0.000 claims description 3
- PMZURENOXWZQFD-UHFFFAOYSA-L Sodium Sulfate Chemical compound [Na+].[Na+].[O-]S([O-])(=O)=O PMZURENOXWZQFD-UHFFFAOYSA-L 0.000 claims 1
- 238000009472 formulation Methods 0.000 claims 1
- 229910052938 sodium sulfate Inorganic materials 0.000 claims 1
- 235000011152 sodium sulphate Nutrition 0.000 claims 1
- 238000005553 drilling Methods 0.000 abstract description 44
- 239000012530 fluid Substances 0.000 abstract description 31
- 239000004927 clay Substances 0.000 abstract description 8
- 125000003368 amide group Chemical group 0.000 abstract description 3
- 230000009467 reduction Effects 0.000 abstract description 3
- 230000036571 hydration Effects 0.000 abstract description 2
- 238000006703 hydration reaction Methods 0.000 abstract description 2
- 235000012239 silicon dioxide Nutrition 0.000 abstract description 2
- 238000001179 sorption measurement Methods 0.000 abstract description 2
- LXEKPEMOWBOYRF-UHFFFAOYSA-N [2-[(1-azaniumyl-1-imino-2-methylpropan-2-yl)diazenyl]-2-methylpropanimidoyl]azanium;dichloride Chemical compound Cl.Cl.NC(=N)C(C)(C)N=NC(C)(C)C(N)=N LXEKPEMOWBOYRF-UHFFFAOYSA-N 0.000 description 18
- 239000002002 slurry Substances 0.000 description 10
- 229940092782 bentonite Drugs 0.000 description 8
- 229910000278 bentonite Inorganic materials 0.000 description 8
- 239000000440 bentonite Substances 0.000 description 8
- SVPXDRXYRYOSEX-UHFFFAOYSA-N bentoquatam Chemical compound O.O=[Si]=O.O=[Al]O[Al]=O SVPXDRXYRYOSEX-UHFFFAOYSA-N 0.000 description 8
- ONCZQWJXONKSMM-UHFFFAOYSA-N dialuminum;disodium;oxygen(2-);silicon(4+);hydrate Chemical compound O.[O-2].[O-2].[O-2].[O-2].[O-2].[O-2].[O-2].[O-2].[O-2].[O-2].[O-2].[O-2].[Na+].[Na+].[Al+3].[Al+3].[Si+4].[Si+4].[Si+4].[Si+4] ONCZQWJXONKSMM-UHFFFAOYSA-N 0.000 description 8
- 229940080314 sodium bentonite Drugs 0.000 description 8
- 229910000280 sodium bentonite Inorganic materials 0.000 description 8
- 238000003760 magnetic stirring Methods 0.000 description 6
- UWNADWZGEHDQAB-UHFFFAOYSA-N 2,5-dimethylhexane Chemical group CC(C)CCC(C)C UWNADWZGEHDQAB-UHFFFAOYSA-N 0.000 description 4
- -1 amidine hydrochloride Chemical class 0.000 description 4
- 239000010440 gypsum Substances 0.000 description 4
- 229910052602 gypsum Inorganic materials 0.000 description 4
- 230000002209 hydrophobic effect Effects 0.000 description 4
- 239000003921 oil Substances 0.000 description 4
- 239000002981 blocking agent Substances 0.000 description 3
- 239000001768 carboxy methyl cellulose Substances 0.000 description 3
- 239000003638 chemical reducing agent Substances 0.000 description 3
- 230000000052 comparative effect Effects 0.000 description 3
- 239000000706 filtrate Substances 0.000 description 3
- 239000007789 gas Substances 0.000 description 3
- MNCGMVDMOKPCSQ-UHFFFAOYSA-M sodium;2-phenylethenesulfonate Chemical compound [Na+].[O-]S(=O)(=O)C=CC1=CC=CC=C1 MNCGMVDMOKPCSQ-UHFFFAOYSA-M 0.000 description 3
- KXGFMDJXCMQABM-UHFFFAOYSA-N 2-methoxy-6-methylphenol Chemical class [CH]OC1=CC=CC([CH])=C1O KXGFMDJXCMQABM-UHFFFAOYSA-N 0.000 description 2
- 229920002134 Carboxymethyl cellulose Polymers 0.000 description 2
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 description 2
- 239000008186 active pharmaceutical agent Substances 0.000 description 2
- 150000001409 amidines Chemical class 0.000 description 2
- 239000011575 calcium Substances 0.000 description 2
- 229910052791 calcium Inorganic materials 0.000 description 2
- 235000010948 carboxy methyl cellulose Nutrition 0.000 description 2
- 239000008112 carboxymethyl-cellulose Substances 0.000 description 2
- 150000002148 esters Chemical class 0.000 description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
- 239000011148 porous material Substances 0.000 description 2
- MAGFQRLKWCCTQJ-UHFFFAOYSA-N 4-ethenylbenzenesulfonic acid Chemical compound OS(=O)(=O)C1=CC=C(C=C)C=C1 MAGFQRLKWCCTQJ-UHFFFAOYSA-N 0.000 description 1
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 1
- 101000832669 Rattus norvegicus Probable alcohol sulfotransferase Proteins 0.000 description 1
- DPXJVFZANSGRMM-UHFFFAOYSA-N acetic acid;2,3,4,5,6-pentahydroxyhexanal;sodium Chemical compound [Na].CC(O)=O.OCC(O)C(O)C(O)C(O)C=O DPXJVFZANSGRMM-UHFFFAOYSA-N 0.000 description 1
- 230000032683 aging Effects 0.000 description 1
- 125000000217 alkyl group Chemical group 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000009933 burial Methods 0.000 description 1
- 125000003178 carboxy group Chemical group [H]OC(*)=O 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 125000003438 dodecyl group Chemical group [H]C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])* 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000000839 emulsion Substances 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000005755 formation reaction Methods 0.000 description 1
- 239000013505 freshwater Substances 0.000 description 1
- 230000009545 invasion Effects 0.000 description 1
- 238000011068 loading method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000003345 natural gas Substances 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 239000003209 petroleum derivative Substances 0.000 description 1
- 125000001997 phenyl group Chemical group [H]C1=C([H])C([H])=C(*)C([H])=C1[H] 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 230000000379 polymerizing effect Effects 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 239000011435 rock Substances 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 239000004576 sand Substances 0.000 description 1
- 235000019812 sodium carboxymethyl cellulose Nutrition 0.000 description 1
- 229920001027 sodium carboxymethylcellulose Polymers 0.000 description 1
- 239000011780 sodium chloride Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 125000000542 sulfonic acid group Chemical group 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
Classifications
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- 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
- 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
- C08F212/00—Copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by an aromatic carbocyclic ring
- C08F212/02—Monomers containing only one unsaturated aliphatic radical
- C08F212/04—Monomers containing only one unsaturated aliphatic radical containing one ring
- C08F212/14—Monomers containing only one unsaturated aliphatic radical containing one ring substituted by heteroatoms or groups containing heteroatoms
- C08F212/30—Sulfur
-
- 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
- C08F220/00—Copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical or a salt, anhydride ester, amide, imide or nitrile thereof
- C08F220/02—Monocarboxylic acids having less than ten carbon atoms; Derivatives thereof
- C08F220/52—Amides or imides
- C08F220/54—Amides, e.g. N,N-dimethylacrylamide or N-isopropylacrylamide
- C08F220/56—Acrylamide; Methacrylamide
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- 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
- C09K8/5045—Compositions based on water or polar solvents containing inorganic compounds
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- 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
- C09K8/5083—Compositions based on water or polar solvents containing organic compounds macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds
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- Chemical & Material Sciences (AREA)
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- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Health & Medical Sciences (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Dispersion Chemistry (AREA)
- Inorganic Chemistry (AREA)
- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
Abstract
The invention relates to the technical field of drilling, in particular to a high-temperature-resistant and saturated-salt-resistant plugging fluid loss additive and a preparation method thereof, wherein the high-temperature-resistant and saturated-salt-resistant plugging fluid loss additive is prepared from 5-10 parts by mass of modified SiO22-5 parts of sodium dodecyl sulfate, 10-20 parts of acrylamide, 10-20 parts of sodium p-styrene sulfonate, 2-6 parts of lauryl methacrylate, 0.2-0.5 part of initiator and a proper amount of acetone and water. The high temperature resistant and anti-saturation salt seal of the inventionThe plugging and fluid loss additive has the performance of protecting clay and plugging under the conditions of high temperature and high salinity; the adsorption groups such as amide groups and the like are adsorbed on the surface of the clay of the drilling fluid to enhance the high-temperature hydration performance and salt resistance of the clay, so that the clay of the drilling fluid still has good dispersion performance under the conditions of high temperature and high salt, the high-temperature and high salt stability of the drilling fluid is improved, and meanwhile, the existence of the silicon dioxide enables the treating agent to have plugging capacity, improves the compactness of a mud cake, reduces the filtration loss and enhances the filtration loss reduction performance of the drilling fluid under the conditions of high temperature and high salt.
Description
Technical Field
The invention relates to the technical field of drilling, in particular to a high-temperature-resistant saturated salt plugging fluid loss additive and a preparation method thereof.
Background
Petroleum and natural gas are used as strategic resources, and have important influence on the economic safety and stable development of a country. The energy demand of China increases year by year, the external dependence of petroleum is continuously improved, the energy situation is severe, and new take-over oil and gas resources are urgently needed. According to the second national oil and gas resource evaluation result, the residual oil and gas resources in China are mainly distributed in the deep layer, the burial depth generally exceeds 5000m, and the high temperature (180-260 ℃) and the complex geological conditions (salt-gypsum layer) are accompanied. At present, the drilling of ultra-deep wells is implemented in oil fields of Daqing, south China sea, Jilin, Xinjiang, Tarim and the like. The ultra-high temperature resistant high-salt drilling fluid is the key for successful drilling of deep salt-gypsum formations, but the existing drilling fluid treating agent is difficult to meet the drilling requirements under the condition of deep large-section salt-gypsum layers, the drilling fluid is difficult to carry rocks and suspend weighting materials due to failure in drilling engineering, the stability of a well wall is difficult to maintain due to excessive filtration loss, serious safety accidents such as well collapse, drilling sticking, blowout and the like are easily caused, and even the well is scrapped. CN108424754A proposes a high-temperature and high-calcium resistant drilling fluid and a preparation method thereof, which has certain high-temperature and calcium resistant capability, but the temperature resistant capability is only 150 ℃; CNIO8342188A proposes one kind of high temperature resistant filtrate reducer, which has temperature resistance up to 200 deg.c in fresh water slurry and temperature resistance of 160 deg.c in salt water slurry.
The prior water-based drilling fluid for drilling the ultra-high temperature well containing the gypsum layer mainly adopts the increase of the dosage of a chemical treatment agent to maintain the performance of the drilling fluid, has high drilling cost, large consumption of the treatment agent, frequent treatment, more complex drilling accidents and longer drilling period, and seriously influences the drilling quality, speed and benefit.
Disclosure of Invention
The invention aims to solve the technical problem of providing a high-temperature-resistant and saturated-salt-resistant plugging fluid loss additive and a preparation method thereof, and solves the problems in the prior art.
The technical scheme for solving the technical problems is as follows: the high-temperature-resistant and saturated-salt-resistant plugging fluid loss agent is prepared from 5-10 parts by mass of modified SiO22-5 parts of sodium dodecyl sulfate, 10-20 parts of acrylamide, 10-20 parts of sodium p-styrene sulfonate, 2-6 parts of lauryl methacrylate, 0.2-0.5 part of initiator and a proper amount of acetone and water.
On the basis of the technical scheme, the invention can be further improved as follows.
Further, the modified SiO2Is prepared from (by mass) SiO 40-7024 to 7 portions of KH570, 0.5 to 1.5 portions of initiator, a proper amount of absolute ethyl alcohol, a proper amount of pH value regulator and a proper amount of water.
Further, the pH value regulator is triethylamine.
Further, the initiator is azobisisobutyramidine hydrochloride.
The invention also provides the following technical scheme for solving the technical problems: a preparation method of a high-temperature-resistant saturated-salt-resistant plugging fluid loss agent comprises the following steps:
step one, weighing 5-10 parts of modified SiO2Respectively adding 2-5 parts of sodium dodecyl sulfate, 10-20 parts of acrylamide, 10-20 parts of sodium p-styrene sulfonate and 2-6 parts of lauryl methacrylate into a flask filled with a proper amount of water, and stirring until the materials are fully dispersed;
heating the flask to 60-70 ℃ in a water bath, keeping stirring and heating, and performing oxygen removal treatment;
adding 0.2-0.5 part of initiator into the flask, and maintaining the reaction for 4-5 hours;
and step four, taking out the white viscous reaction product, washing the white viscous reaction product for 2 to 3 times by using acetone, and drying and crushing the white viscous reaction product to obtain the high-temperature-resistant and saturated-salt-resistant plugging fluid loss additive.
Further, the improved SiO in the first step2The preparation method comprises the following steps:
1) weighing 40-70 parts of SiO by mass fraction2Adding into 100 parts of absolute ethyl alcohol, and stirring by magnetic force to fully disperse;
2) weighing 4-7 parts by mass of KH570, adding into a 100 parts water/absolute ethyl alcohol system, and stirring by magnetic force to fully disperse;
3) pouring the two dispersion systems in the step 1) and the step 2) into a flask, and adjusting the pH value to 8-9 by using a pH value regulator.
4) Adding 0.5-1.5 parts of initiator into the flask, and carrying out reflux reaction at 60 ℃ for 4-5 h;
5) taking out the reactant, filtering, washing the powdery product with ethanol, filtering again, repeatedly washing for 2-3 times, and vacuum drying or air drying at room temperature to obtain the modified SiO2。
Further, the water/absolute ethyl alcohol system in the step 2) is prepared by uniformly mixing water and absolute ethyl alcohol according to the volume fraction of 1: 9.
Further, the initiator in the step 4) is azodiisobutyramidine hydrochloride.
Further, the pH value regulator in the step 3) is triethylamine.
Further, the oxygen removal treatment mode in the second step is to introduce nitrogen to remove oxygen for 30 minutes.
The invention has the beneficial effects that: the high-temperature-resistant and saturated-salt-resistant plugging fluid loss additive is a multipolymer prepared by polymerizing modified SiO2, acrylamide, sodium p-styrenesulfonate and lauryl methacrylate in emulsion, and has the performances of clay protection and plugging under the conditions of high temperature and high salt, so that the high-temperature-resistant and saturated-salt-resistant plugging fluid loss additive can play a role in high-temperature-resistant and saturated-salt-resistant fluid loss reduction; the molecular chain contains amide groups (which can be hydrolyzed into carboxyl at high temperature), sulfonic acid groups and other groups, so that the hydrophilicity is strong, the high-temperature resistance of the molecules is improved due to the existence of benzene rings, a long alkyl chain can form a hydrophobic association structure in water to improve the salt resistance of the treating agent, and the adsorption groups such as the amide groups are adsorbed on the surface of the clay of the drilling fluid to enhance the high-temperature hydration performance and the salt resistance of the clay, so that the clay of the drilling fluid still has good dispersion performance under the conditions of high temperature and high salt, and the high-temperature and high-salt stability of the drilling fluid is improved; meanwhile, the existence of the silicon dioxide enables the treating agent to have plugging capability, so that micro pores in a mud cake and pores in a stratum can be plugged in the process that the drilling fluid forms the mud cake, the compactness of the mud cake is improved, the filtration loss is reduced, and the filtration loss reduction performance of the drilling fluid under high temperature and high salt is enhanced.
Detailed Description
The principles and features of this invention are described below in conjunction with examples which are set forth to illustrate, but are not to be construed to limit the scope of the invention.
Example one
In this embodiment, the high temperature resistant and saturated salt resistant plugging fluid loss agent is prepared from 10 parts by weight of modified SiO25 parts of sodium dodecyl sulfate, 20 parts of acrylamide, 15 parts of sodium styrene sulfonate, 2 parts of lauryl methacrylate, 0.25 part of initiator azodiisobutyramidine hydrochloride (V-50) and a proper amount of acetone and water.
In this example, the modified SiO2By mass, 40 parts of SiO25 parts of KH570, 1 part of initiator azodiisobutyl amidine hydrochloride (V-50), a proper amount of absolute ethyl alcohol, andtriethylamine as a pH value regulator and a proper amount of water.
In this example, SiO was modified2The preparation method comprises the following steps:
1) weighing 40 parts by mass of SiO2Adding the mixture into 100 parts of absolute ethyl alcohol, and fully dispersing the mixture by magnetic stirring;
2) weighing 5 parts by mass of KH570, adding into 100 parts by mass of a water/absolute ethyl alcohol system, and performing magnetic stirring to fully disperse the mixture, wherein the water/absolute ethyl alcohol system is prepared by uniformly mixing water and absolute ethyl alcohol according to the volume fraction of 1: 9;
3) pouring the two dispersion systems obtained in the step 1) and the step 2) into a flask, and adjusting the pH value to 8-9 by using a pH value regulator triethylamine;
4) 1 part of initiator azo diisobutyl amidine hydrochloride (V-50) is added into a flask and refluxed for reaction for 5 hours at 60 ℃;
5) taking out the reactant, filtering, washing the powdery product with ethanol, filtering again, repeatedly washing for 3 times, and vacuum drying or air drying the product at room temperature to obtain the modified SiO2。
In this embodiment, the preparation method of the high temperature and high salt resistant hydrophobic blocking agent comprises the following steps: step one, weighing 10 parts of modified SiO2Respectively adding 5 parts of sodium dodecyl sulfate, 20 parts of acrylamide, 15 parts of sodium styrene sulfonate and 2 parts of lauryl methacrylate into a flask filled with 150 parts of water, and stirring until the mixture is fully dispersed;
heating the flask to 65 ℃ in a water bath, keeping stirring and heating, and deoxidizing for 30 minutes by using nitrogen;
adding 0.25 part of initiator into the flask, and maintaining the reaction for 4 hours;
and step four, taking out the white viscous reaction product, washing the white viscous reaction product for 3 times by using acetone, and drying and crushing the white viscous reaction product to obtain the high-temperature-resistant and saturated-salt-resistant plugging fluid loss additive A1.
Example two
In this embodiment, the high temperature resistant and saturated salt resistant plugging fluid loss agent is prepared from 5 parts by weight of modified SiO25 parts of sodium dodecyl sulfate, 20 parts of acrylamide and 15 parts ofSodium p-styrene sulfonate, 2 parts of lauryl methacrylate, 0.25 part of azo-bis-iso-butyl amidine hydrochloride (V-50) as an initiator, and proper amount of acetone and water.
In this example, the modified SiO2By mass, 40 parts of SiO25 parts of KH570, 1 part of initiator azodiisobutyl amidine hydrochloride (V-50), a proper amount of absolute ethyl alcohol, a proper amount of pH value regulator triethylamine and a proper amount of water.
In this example, SiO was modified2The preparation method comprises the following steps:
1) weighing 40 parts by mass of SiO2Adding the mixture into 100 parts of absolute ethyl alcohol, and fully dispersing the mixture by magnetic stirring;
2) weighing 5 parts by mass of KH570, adding into 100 parts by mass of a water/absolute ethyl alcohol system, and performing magnetic stirring to fully disperse the mixture, wherein the water/absolute ethyl alcohol system is prepared by uniformly mixing water and absolute ethyl alcohol according to the volume fraction of 1: 9;
3) pouring the two dispersion systems obtained in the step 1) and the step 2) into a flask, and adjusting the pH value to 8-9 by using a pH value regulator triethylamine;
4) 1 part of initiator azo diisobutyl amidine hydrochloride (V-50) is added into a flask and refluxed for reaction for 5 hours at 60 ℃;
5) taking out the reactant, filtering, washing the powdery product with ethanol, filtering again, repeatedly washing for 3 times, and vacuum drying or air drying the product at room temperature to obtain the modified SiO2。
In this embodiment, the preparation method of the high temperature and high salt resistant hydrophobic blocking agent comprises the following steps: step one, weighing 5 parts of modified SiO2Respectively adding 5 parts of sodium dodecyl sulfate, 20 parts of acrylamide, 15 parts of sodium styrene sulfonate and 2 parts of lauryl methacrylate into a flask filled with 150 parts of water, and stirring until the mixture is fully dispersed;
heating the flask to 65 ℃ in a water bath, keeping stirring and heating, and deoxidizing for 30 minutes by using nitrogen;
adding 0.25 part of initiator into the flask, and maintaining the reaction for 4 hours;
and step four, taking out the white viscous reaction product, washing the white viscous reaction product for 3 times by using acetone, and drying and crushing the white viscous reaction product to obtain the high-temperature-resistant and saturated-salt-resistant plugging fluid loss additive A2.
EXAMPLE III
In this embodiment, the high temperature resistant and saturated salt resistant plugging fluid loss agent is prepared from 10 parts by weight of modified SiO25 parts of sodium dodecyl sulfate, 15 parts of acrylamide, 20 parts of sodium p-styrene sulfonate, 3 parts of lauryl methacrylate, 0.5 part of azo-bis-isobutyramidine hydrochloride (V-50) as an initiator and proper amount of acetone and water.
In this example, the modified SiO2Is prepared from 70 parts by mass of SiO27 parts of KH570, 1.5 parts of initiator azodiisobutyl amidine hydrochloride (V-50), a proper amount of absolute ethyl alcohol, a proper amount of pH value regulator triethylamine and a proper amount of water.
In this example, SiO was modified2The preparation method comprises the following steps:
1) weighing 70 parts by mass of SiO2Adding the mixture into 100 parts of absolute ethyl alcohol, and fully dispersing the mixture by magnetic stirring;
2) weighing 7 parts by mass of KH570, adding into 100 parts by mass of a water/absolute ethyl alcohol system, and performing magnetic stirring to fully disperse the KH570, wherein the water/absolute ethyl alcohol system is prepared by uniformly mixing water and absolute ethyl alcohol according to the volume fraction of 1: 9;
3) pouring the two dispersion systems obtained in the step 1) and the step 2) into a flask, and adjusting the pH value to 8-9 by using a pH value regulator triethylamine;
4) 1.5 parts of initiator azobisisobutyramidine hydrochloride (V-50) is added into the flask, and the reflux reaction is carried out for 5 hours at the temperature of 60 ℃;
5) taking out the reactant, filtering, washing the powdery product with ethanol, filtering again, repeatedly washing for 3 times, and vacuum drying or air drying the product at room temperature to obtain the modified SiO2。
In this embodiment, the preparation method of the high temperature and high salt resistant hydrophobic blocking agent comprises the following steps: step one, weighing 10 parts of modified SiO25 parts of sodium dodecyl sulfate, 15 parts of acrylamide, 20 parts of sodium p-styrene sulfonate and 3 parts of lauryl methacrylateAdding the ester into flasks filled with 150 parts of water respectively, and stirring until the ester is fully dispersed;
heating the flask to 65 ℃ in a water bath, keeping stirring and heating, and deoxidizing for 30 minutes by using nitrogen;
adding 0.5 part of initiator into the flask, and maintaining the reaction for 4 hours;
and step four, taking out the white viscous reaction product, washing the white viscous reaction product for 3 times by using acetone, and drying and crushing the white viscous reaction product to obtain the high-temperature-resistant and saturated-salt-resistant plugging fluid loss additive A3.
Experimental example 1
Drilling fluid F1 was prepared as follows: adding 4 parts by mass of sodium bentonite into 100 parts by mass of water, stirring at a high speed for 20min, standing and maintaining at room temperature for 24h, stirring the bentonite slurry for 20min, and adding 1 part of A1.
Experimental example 2
Drilling fluid F2 was prepared as follows: adding 4 parts by mass of sodium bentonite into 100 parts by mass of water, stirring at a high speed for 20min, standing and maintaining at room temperature for 24h, stirring the bentonite slurry for 20min, and adding 2 parts of A1.
Experimental example 3
Drilling fluid F3 was prepared as follows: adding 4 parts by mass of sodium bentonite into 100 parts by mass of water, stirring at a high speed for 20min, standing and maintaining at room temperature for 24h, stirring the bentonite slurry for 20min, and adding 3 parts of A1.
Experimental example 4
Drilling fluid F4 was formulated as follows: adding 4 parts by mass of sodium bentonite into 100 parts by mass of water, stirring at a high speed for 20min, standing and maintaining at room temperature for 24h, stirring the bentonite slurry for 20min, and adding 3 parts of A2.
Experimental example 5
Drilling fluid F5 was formulated as follows: adding 4 parts by mass of sodium bentonite into 100 parts by mass of water, stirring at a high speed for 20min, standing and maintaining at room temperature for 24h, stirring the bentonite slurry for 20min, and adding 3 parts of A3.
Comparative example 1
Drilling fluid DF1 was prepared according to the following method: adding 4 parts by mass of sodium bentonite into 100 parts of water, stirring at a high speed for 20min, standing and maintaining at room temperature for 24h, and stirring the bentonite slurry for 20min without adding a treating agent.
Comparative example 2
Drilling fluid DF2 was prepared according to the following method: adding 4 parts by mass of sodium bentonite into 100 parts by mass of water, stirring at a high speed for 20min, standing and maintaining at room temperature for 24h, stirring the bentonite slurry for 20min, and adding 3 parts by mass of sulfonated phenolic resin SMP-2.
Comparative example 3
Drilling fluid DF3 was prepared according to the following method: adding 4 parts by mass of sodium bentonite into 100 parts by mass of water, stirring at a high speed for 20min, standing and maintaining at room temperature for 24h, stirring the bentonite slurry for 20min, and adding 3 parts by mass of sodium carboxymethylcellulose (CMC).
Test example 1
Respectively taking 400mL of the drilling fluid Fl-F5 and DF1-DF2, adding 30 wt% of NaCl, stirring for 20min at 5000rpm, loading into an aging tank, placing into a roller furnace, rolling for 16 h at a constant temperature of 200 ℃, taking out, cooling to room temperature, stirring for 20min at 5000rpm, and respectively measuring the apparent viscosity (AV, mPa.s), the plastic viscosity (PV, mPa.s), the dynamic shear force (YP, Pa) and the medium-pressure API water loss (FL/T16783.1-2006)APImL) and high temperature high pressure Water loss (FL)HTHPmL, 200 ℃ C.), the results are shown in Table 1.
TABLE 1 drilling fluid Performance test
The data in the table 1 show that when the high-temperature-resistant and saturated-salt-resistant filtrate reducer is adopted in the drilling fluid, the filtration loss of the drilling fluid can be reduced to 5.8ml, the filtration loss of HTHP (200 ℃) can be reduced to 26.6ml, the invasion depth of a sand bed plugging experiment is only 3.3cm, the filtration loss of the drilling fluid is obviously reduced, the plugging performance of the drilling fluid is improved, and the effect is far better than that of sulfonated phenolic resin and carboxymethyl cellulose.
In conclusion, the high-temperature-resistant and saturated-salt-resistant filtrate reducer can effectively reduce the filtration loss of drilling fluid and improve the plugging performance of the drilling fluid under the conditions of high temperature and high salt, and meets the requirements of deep and ultra-deep drilling.
In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.
In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (10)
1. The high-temperature-resistant and saturated-salt-resistant plugging fluid loss agent is characterized by comprising 5-10 parts by mass of modified SiO22-5 parts of tenDialkyl sodium sulfate, 10-20 parts of acrylamide, 10-20 parts of sodium p-styrene sulfonate, 2-6 parts of lauryl methacrylate, 0.2-0.5 part of initiator and a proper amount of acetone and water.
2. The high temperature resistant and saturated salt resistant plugging fluid loss additive as claimed in claim 1, wherein the modified SiO is2Is prepared from (by mass) SiO 40-7024 to 7 portions of KH570, 0.5 to 1.5 portions of initiator, a proper amount of absolute ethyl alcohol, a proper amount of pH value regulator and a proper amount of water.
3. The high temperature resistant and saturated salt resistant plugging fluid loss additive as claimed in claim 2, wherein the pH regulator is triethylamine.
4. The high temperature resistant saturated salt plugging fluid loss additive according to any one of claims 1-3, wherein the initiator is azodiisobutyramidine hydrochloride.
5. A method for preparing the high temperature resistant and saturated salt resistant plugging fluid loss additive according to any one of claims 1 to 4, which comprises the following steps:
step one, weighing 5-10 parts of modified SiO2Respectively adding 2-5 parts of sodium dodecyl sulfate, 10-20 parts of acrylamide, 10-20 parts of sodium p-styrene sulfonate and 2-6 parts of lauryl methacrylate into a flask filled with a proper amount of water, and stirring until the materials are fully dispersed;
heating the flask to 60-70 ℃ in a water bath, keeping stirring and heating, and performing oxygen removal treatment;
adding 0.2-0.5 part of initiator into the flask, and maintaining the reaction for 4-5 hours;
and step four, taking out the white viscous reaction product, washing the white viscous reaction product for 2 to 3 times by using acetone, and drying and crushing the white viscous reaction product to obtain the high-temperature-resistant and saturated-salt-resistant plugging fluid loss additive.
6. The high temperature resistant anti-saturation salt plugging fluid loss control of claim 5Process for the preparation of a formulation, characterized in that in step one the SiO is modified2The preparation method comprises the following steps:
1) weighing 40-70 parts of SiO by mass fraction2Adding into 100 parts of absolute ethyl alcohol, and stirring by magnetic force to fully disperse;
2) weighing 4-7 parts by mass of KH570, adding into a 100 parts water/absolute ethyl alcohol system, and stirring by magnetic force to fully disperse;
3) pouring the two dispersion systems obtained in the step 1) and the step 2) into a flask, and adjusting the pH value to 8-9 by using a pH value regulator;
4) adding 0.5-1.5 parts of initiator into the flask, and carrying out reflux reaction at 60 ℃ for 4-5 h;
5) taking out the reactant, filtering, washing the powdery product with ethanol, filtering again, repeatedly washing for 2-3 times, and vacuum drying or air drying at room temperature to obtain the modified SiO2。
7. The preparation method of the high temperature resistant and saturated salt resistant plugging fluid loss additive according to claim 6, wherein the water/absolute ethyl alcohol system in the step 2) is prepared by uniformly mixing water and absolute ethyl alcohol according to a volume fraction of 1: 9.
8. The method for preparing the high temperature resistant and saturated salt blockage fluid loss additive according to claim 5 or 6, wherein the initiator in the step 4) is azodiisobutyramidine hydrochloride.
9. The method for preparing the high temperature resistant and saturated salt resistant plugging fluid loss additive according to claim 6 or 7, wherein the pH value regulator in the step 3) is triethylamine.
10. The method for preparing the high temperature resistant and saturated salt resistant plugging fluid loss additive according to any one of claims 5 to 7, wherein the oxygen removal treatment in the second step is to introduce nitrogen to remove oxygen for 30 minutes.
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