CN115109575B - Low permeability reservoir CO 2 Nanometer foam oil-washing agent for driving and preparation method and application thereof - Google Patents
Low permeability reservoir CO 2 Nanometer foam oil-washing agent for driving and preparation method and application thereof Download PDFInfo
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- 238000005406 washing Methods 0.000 title claims abstract description 68
- 239000006260 foam Substances 0.000 title claims abstract description 63
- 230000035699 permeability Effects 0.000 title claims abstract description 34
- 238000002360 preparation method Methods 0.000 title claims abstract description 11
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 56
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 46
- 239000004094 surface-active agent Substances 0.000 claims abstract description 37
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims abstract description 36
- 239000002736 nonionic surfactant Substances 0.000 claims abstract description 10
- 239000003945 anionic surfactant Substances 0.000 claims abstract description 8
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 claims abstract description 7
- JLVVSXFLKOJNIY-UHFFFAOYSA-N Magnesium ion Chemical compound [Mg+2] JLVVSXFLKOJNIY-UHFFFAOYSA-N 0.000 claims abstract description 7
- 230000033558 biomineral tissue development Effects 0.000 claims abstract description 7
- 239000011575 calcium Substances 0.000 claims abstract description 7
- 229910001424 calcium ion Inorganic materials 0.000 claims abstract description 7
- 229910001425 magnesium ion Inorganic materials 0.000 claims abstract description 7
- 229910052799 carbon Inorganic materials 0.000 claims abstract description 6
- 238000003756 stirring Methods 0.000 claims description 42
- 229920000056 polyoxyethylene ether Polymers 0.000 claims description 25
- 229940051841 polyoxyethylene ether Drugs 0.000 claims description 24
- 239000007788 liquid Substances 0.000 claims description 17
- 238000006243 chemical reaction Methods 0.000 claims description 16
- 239000007787 solid Substances 0.000 claims description 16
- 239000008208 nanofoam Substances 0.000 claims description 14
- 239000011734 sodium Substances 0.000 claims description 13
- 229910052708 sodium Inorganic materials 0.000 claims description 11
- KFZMGEQAYNKOFK-UHFFFAOYSA-N Isopropanol Chemical compound CC(C)O KFZMGEQAYNKOFK-UHFFFAOYSA-N 0.000 claims description 10
- 229940104261 taurate Drugs 0.000 claims description 10
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical group C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 claims description 9
- -1 methyl taurate Chemical compound 0.000 claims description 8
- 238000005187 foaming Methods 0.000 claims description 6
- 238000005516 engineering process Methods 0.000 claims description 5
- WRIDQFICGBMAFQ-UHFFFAOYSA-N (E)-8-Octadecenoic acid Natural products CCCCCCCCCC=CCCCCCCC(O)=O WRIDQFICGBMAFQ-UHFFFAOYSA-N 0.000 claims description 2
- LQJBNNIYVWPHFW-UHFFFAOYSA-N 20:1omega9c fatty acid Natural products CCCCCCCCCCC=CCCCCCCCC(O)=O LQJBNNIYVWPHFW-UHFFFAOYSA-N 0.000 claims description 2
- QSBYPNXLFMSGKH-UHFFFAOYSA-N 9-Heptadecensaeure Natural products CCCCCCCC=CCCCCCCCC(O)=O QSBYPNXLFMSGKH-UHFFFAOYSA-N 0.000 claims description 2
- 235000013162 Cocos nucifera Nutrition 0.000 claims description 2
- 244000060011 Cocos nucifera Species 0.000 claims description 2
- 239000005642 Oleic acid Substances 0.000 claims description 2
- ZQPPMHVWECSIRJ-UHFFFAOYSA-N Oleic acid Natural products CCCCCCCCC=CCCCCCCCC(O)=O ZQPPMHVWECSIRJ-UHFFFAOYSA-N 0.000 claims description 2
- QXJSBBXBKPUZAA-UHFFFAOYSA-N isooleic acid Natural products CCCCCCCC=CCCCCCCCCC(O)=O QXJSBBXBKPUZAA-UHFFFAOYSA-N 0.000 claims description 2
- ZQPPMHVWECSIRJ-KTKRTIGZSA-N oleic acid Chemical compound CCCCCCCC\C=C/CCCCCCCC(O)=O ZQPPMHVWECSIRJ-KTKRTIGZSA-N 0.000 claims description 2
- 239000002245 particle Substances 0.000 claims description 2
- 230000005465 channeling Effects 0.000 abstract description 7
- 230000000694 effects Effects 0.000 abstract description 5
- 230000002195 synergetic effect Effects 0.000 abstract description 4
- 230000002708 enhancing effect Effects 0.000 abstract description 2
- 239000003921 oil Substances 0.000 description 85
- 230000000052 comparative effect Effects 0.000 description 20
- 238000012360 testing method Methods 0.000 description 20
- 239000000203 mixture Substances 0.000 description 13
- CAQWNKXTMBFBGI-UHFFFAOYSA-N C.[Na] Chemical compound C.[Na] CAQWNKXTMBFBGI-UHFFFAOYSA-N 0.000 description 12
- 229940104256 sodium taurate Drugs 0.000 description 12
- 238000002844 melting Methods 0.000 description 11
- 230000008018 melting Effects 0.000 description 11
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 10
- 239000010779 crude oil Substances 0.000 description 9
- 238000009472 formulation Methods 0.000 description 9
- 239000007789 gas Substances 0.000 description 8
- 230000015572 biosynthetic process Effects 0.000 description 5
- 229910002092 carbon dioxide Inorganic materials 0.000 description 5
- 238000006073 displacement reaction Methods 0.000 description 5
- 238000002474 experimental method Methods 0.000 description 5
- 230000001965 increasing effect Effects 0.000 description 5
- RTZKZFJDLAIYFH-UHFFFAOYSA-N Diethyl ether Chemical compound CCOCC RTZKZFJDLAIYFH-UHFFFAOYSA-N 0.000 description 4
- 239000001569 carbon dioxide Substances 0.000 description 4
- 239000003027 oil sand Substances 0.000 description 4
- 238000011084 recovery Methods 0.000 description 4
- 239000012488 sample solution Substances 0.000 description 4
- AFCARXCZXQIEQB-UHFFFAOYSA-N N-[3-oxo-3-(2,4,6,7-tetrahydrotriazolo[4,5-c]pyridin-5-yl)propyl]-2-[[3-(trifluoromethoxy)phenyl]methylamino]pyrimidine-5-carboxamide Chemical compound O=C(CCNC(=O)C=1C=NC(=NC=1)NCC1=CC(=CC=C1)OC(F)(F)F)N1CC2=C(CC1)NN=N2 AFCARXCZXQIEQB-UHFFFAOYSA-N 0.000 description 3
- 230000008859 change Effects 0.000 description 3
- 238000001035 drying Methods 0.000 description 3
- 239000012530 fluid Substances 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 125000002496 methyl group Chemical group [H]C([H])([H])* 0.000 description 3
- 238000002156 mixing Methods 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 239000002994 raw material Substances 0.000 description 3
- 239000000523 sample Substances 0.000 description 3
- 239000012085 test solution Substances 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- 241000196324 Embryophyta Species 0.000 description 2
- SUZRRICLUFMAQD-UHFFFAOYSA-N N-Methyltaurine Chemical compound CNCCS(O)(=O)=O SUZRRICLUFMAQD-UHFFFAOYSA-N 0.000 description 2
- 239000011149 active material Substances 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 230000018109 developmental process Effects 0.000 description 2
- 238000002347 injection Methods 0.000 description 2
- 239000007924 injection Substances 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000011056 performance test Methods 0.000 description 2
- 239000003208 petroleum Substances 0.000 description 2
- 239000011435 rock Substances 0.000 description 2
- 150000003839 salts Chemical class 0.000 description 2
- 239000004576 sand Substances 0.000 description 2
- XOAAWQZATWQOTB-UHFFFAOYSA-N taurine Chemical compound NCCS(O)(=O)=O XOAAWQZATWQOTB-UHFFFAOYSA-N 0.000 description 2
- 238000010998 test method Methods 0.000 description 2
- 238000005303 weighing Methods 0.000 description 2
- ZDSCFBCGDDCJFZ-UHFFFAOYSA-N 2-(methylamino)ethanesulfonic acid;sodium Chemical compound [Na].CNCCS(O)(=O)=O ZDSCFBCGDDCJFZ-UHFFFAOYSA-N 0.000 description 1
- 239000004604 Blowing Agent Substances 0.000 description 1
- 239000004215 Carbon black (E152) Substances 0.000 description 1
- ZAMOUSCENKQFHK-UHFFFAOYSA-N Chlorine atom Chemical compound [Cl] ZAMOUSCENKQFHK-UHFFFAOYSA-N 0.000 description 1
- 229920000742 Cotton Polymers 0.000 description 1
- 230000032683 aging Effects 0.000 description 1
- 150000001413 amino acids Chemical class 0.000 description 1
- 239000002280 amphoteric surfactant Substances 0.000 description 1
- 239000007864 aqueous solution Substances 0.000 description 1
- 239000000460 chlorine Substances 0.000 description 1
- 229910052801 chlorine Inorganic materials 0.000 description 1
- 239000013065 commercial product Substances 0.000 description 1
- 239000011365 complex material Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 235000014113 dietary fatty acids Nutrition 0.000 description 1
- 238000007598 dipping method Methods 0.000 description 1
- 239000012153 distilled water Substances 0.000 description 1
- 238000010828 elution Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 230000003203 everyday effect Effects 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 239000000194 fatty acid Substances 0.000 description 1
- 229930195729 fatty acid Natural products 0.000 description 1
- 150000004665 fatty acids Chemical class 0.000 description 1
- 150000002191 fatty alcohols Chemical class 0.000 description 1
- 238000007667 floating Methods 0.000 description 1
- 239000004872 foam stabilizing agent Substances 0.000 description 1
- 239000004088 foaming agent Substances 0.000 description 1
- 239000008398 formation water Substances 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 229930195733 hydrocarbon Natural products 0.000 description 1
- 150000002430 hydrocarbons Chemical class 0.000 description 1
- 229910052500 inorganic mineral Inorganic materials 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 239000011707 mineral Substances 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 230000008092 positive effect Effects 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 230000009919 sequestration Effects 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 230000001502 supplementing effect Effects 0.000 description 1
- 238000003786 synthesis reaction Methods 0.000 description 1
- 231100000331 toxic Toxicity 0.000 description 1
- 230000002588 toxic effect Effects 0.000 description 1
- 238000009736 wetting 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
- C09K8/58—Compositions for enhanced recovery methods for obtaining hydrocarbons, i.e. for improving the mobility of the oil, e.g. displacing fluids
- C09K8/594—Compositions used in combination with injected gas, e.g. CO2 orcarbonated gas
-
- 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
- C09K8/58—Compositions for enhanced recovery methods for obtaining hydrocarbons, i.e. for improving the mobility of the oil, e.g. displacing fluids
- C09K8/584—Compositions for enhanced recovery methods for obtaining hydrocarbons, i.e. for improving the mobility of the oil, e.g. displacing fluids characterised by the use of specific surfactants
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/16—Enhanced recovery methods for obtaining hydrocarbons
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/16—Enhanced recovery methods for obtaining hydrocarbons
- E21B43/164—Injecting CO2 or carbonated water
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P90/00—Enabling technologies with a potential contribution to greenhouse gas [GHG] emissions mitigation
- Y02P90/70—Combining sequestration of CO2 and exploitation of hydrocarbons by injecting CO2 or carbonated water in oil wells
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Mining & Mineral Resources (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geology (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Geochemistry & Mineralogy (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Detergent Compositions (AREA)
- Emulsifying, Dispersing, Foam-Producing Or Wetting Agents (AREA)
Abstract
The application provides a low-permeability oil reservoir CO 2 A nanometer foam oil-washing agent for driving and a preparation method and application thereof belong to the field of oilfield chemistry. The application provides low-permeability oil reservoir synergistic CO 2 The nanometer foam oil washing agent for driving comprises, by mass, 20% -25% of nanometer surfactant, 12% -22% of anionic surfactant, 15% -20% of nonionic surfactant, 5% of low-carbon alcohol and the balance of water. The foam oil washing agent provided by the application can be effectively applied to stratum water with the mineralization degree less than or equal to 100000mg/L, wherein the concentration of calcium and magnesium ions is less than or equal to 2000mg/L, and the permeability is (0.1-50) multiplied by 10 ‑3 μm 2 Enhancing CO in low permeability reservoirs of (C) 2 The driving effect can effectively solve the problem of CO 2 The problems of gas channeling and poor oil washing rate on heavy components are solved, and the foam oil washing agent is simple in preparation process, low in cost and environment-friendly.
Description
Technical Field
The application belongs to the field of oilfield chemistry, and particularly relates to a low-permeability oil reservoir CO 2 A nanometer foam oil-washing agent for driving and a preparation method and application thereof.
Background
In recent years, with the continuous deep oil and gas exploration, the proportion of low-permeability oil reservoirs in China is gradually increased, which accounts for about 2/3 of the well-established reserves in China, and the gas injection oil displacement technology is paid attention to the problems of high development difficulty, low exploitation efficiency and the like of the low-permeability oil reservoirs. According to the data of China oil exploration and development institute, about 130 hundred million tons of crude oil geological reserves are suitable for carbon dioxide flooding, the recovery ratio can be improved by 15%, 19.2 hundred million tons of recoverable reserves are increased, and about 47 hundred million-55 hundred million tons of carbon dioxide is sealed; if the full reservoir potential is considered, the carbon dioxide sequestration will be over 150 hundred million tons. However, the large-scale application of the CCUS technology and the carbon reduction potential are far from being fully exerted due to the insufficient technology and the weak construction strength of a market system.
CO 2 Is a low-density, non-viscous, high-fluidity fluid with viscosity far lower than that of formation water and formation crude oil, thus being used for CO 2 In the oil displacement process, the viscosity finger-in is caused by the unfavorable fluidity ratio, so that the swept volume is reduced; meanwhile, due to formation heterogeneity, cracks and the like, gas channeling occurs, so that the oil displacement efficiency is reduced. The swept volume can be increased by adding a blowing agent to displace the gas as a foamed fluid, decreasing the flow rate in the high permeable layer by increasing the apparent viscosity of the foamed fluid. But conventional nitrogen foam agent and CO 2 The compatibility is poor, and the half life of the foam is only a few minutes. At the same time, at present CO 2 In the experimental process of driving and improving recovery ratio, CO 2 The extraction capacity of light hydrocarbon components in the residual crude oil is high, and the oil washing efficiency of heavy components deposited on the rock is relatively poor.
To solve CO 2 The problems of poor gas channeling and oil washing rate are urgent to develop a CO suitable for low-permeability reservoirs 2 Foam oil-washing agent for driving can be prepared by CO 2 The foaming agent is injected to foam, prevents gas channeling, has certain oil washing capacity and achieves the purpose of double effects of one agent. Patent CN 113801282A discloses a wash oil for carbon dioxide displacement and a preparation method and application thereof, but the synthesis process is complex, and raw materials mostly belong to highly toxic dangerous goods, are not suitable for popularization and application, and do not have a channeling prevention function.
Disclosure of Invention
The application provides a low-permeability oil reservoir CO 2 Nanometer foam oil-washing agent for driving, preparation method and application thereof, the foam oil-washing agent can be effectively applied to stratum water with mineralization degree less than or equal to 100000mg/L, wherein the concentration of calcium and magnesium ions is less than or equal to 2000mg/L, and the permeability is (0.1-50) multiplied by 10 -3 μm 2 Enhancing CO in low permeability reservoirs of (C) 2 The driving effect can effectively solve the problem of CO 2 The problems of gas channeling and poor oil washing rate on heavy components are solved, and the foam oil washing agent is simple in preparation process, low in cost and environment-friendly.
To achieve the above objectThe application provides a low-permeability oil reservoir synergistic CO 2 The nanometer foam oil washing agent for driving comprises, by mass, 20% -25% of nanometer surfactant, 12% -22% of anionic surfactant, 15% -20% of nonionic surfactant, 5% of low-carbon alcohol and the balance of water.
Preferably, the nano surfactant is a nano surfactant with the code of WX302S which is commercially available from Ningbo front and nano technology limited company, and the particle size is less than or equal to 200nm. The nano surfactant has good injectability, strong foaming capacity, high wash oil rate and temperature and salt resistance.
Preferably, the anionic surfactant is cocoyl methyl taurate sodium, and the molecular formula is as follows:
RCON(CH 3 )CH 2 CH 2 SO 3 Na
wherein R represents coconut oleic acid.
In the above scheme, cocoyl methyl taurate sodium is a novel amino acid type surfactant. The foam-stabilizing agent is formed by condensing natural fatty acid and sodium methyltaurine, and has the characteristics of rich, fine and stable foam under the condition of wide pH value.
Preferably, the nonionic surfactant is isomeric fatty decaalcohol polyoxyethylene ether, which is commercially available from Jiangsu sea Ann petrochemical plant and has a molecular formula of:
RO(CH 2 CH 2 O) n H
wherein r=c 10 H 21 N is any one value selected from 5, 6, 7, 8, 9 and 10.
Preferably, the lower alcohol is at least one selected from ethanol and isopropanol.
The application provides the low permeability reservoir CO according to any one of the technical schemes 2 The preparation method of the nanometer foam oil washing agent for driving comprises the following steps:
preheating anionic surfactant to above 40deg.C, melting from solid state to liquid state, adding into reaction kettle, adding low carbon alcohol, and heating to 40-50 deg.CStirring at deg.C, adding water, stirring for 20-40min, adding nonionic surfactant and nanometer surfactant, and stirring to obtain low permeability oil reservoir CO 2 The nanometer foam oil washing agent is used for driving.
The application provides the low permeability reservoir CO according to any one of the technical schemes 2 The nano foam oil-washing agent for driving has permeability of (0.1-50) x 10 when the stratum temperature is less than or equal to 150 DEG C -3 μm 2 Low-permeability oil reservoir CO with stratum water mineralization less than or equal to 100000mg/L and calcium and magnesium ion concentration less than or equal to 2000mg/L 2 Application in flooding.
Preferably, the low permeability reservoir CO 2 The use concentration of the nano foam oil washing agent for driving is 0.5 weight percent.
Preferably, the interfacial tension is less than or equal to 3.6X10 when the water-soluble mineral is combined with water with the mineralization degree less than or equal to 100000mg/L and the calcium and magnesium ion concentration less than or equal to 2000mg/L -3 mN/m, foaming volume not less than 215mL, foam half-life not less than 75min, and wash oil rate not less than 92.0%.
Compared with the prior art, the application has the advantages and positive effects that:
1. the application provides low permeability reservoir CO 2 The nanometer foam oil washing agent for driving is compounded with nanometer active material and surfactant. The nano active material can change the wettability of the rock surface, and plays a role in wetting reversal, so that the oil washing rate is improved. After the nonionic surfactant, the amphoteric surfactant and the nano surfactant are compounded, the stability of the foam is enhanced, the half life period is prolonged, the oil-water interfacial tension is further reduced, the capillary number is increased, and the purpose of improving the recovery ratio is achieved.
2. The application provides low permeability reservoir CO 2 Nanometer foam oil-washing agent for driving and CO 2 Good compatibility with CO 2 Synergistic effect, two functions of channeling sealing and oil washing are simultaneously achieved, one dose of the oil washing agent has double effects, and CO is greatly improved 2 Oil displacement efficiency.
3. The application provides low permeability reservoir CO 2 The nanometer foam oil-washing agent for driving has the characteristics of temperature resistance and salt resistance, and has good compatibility with oil and water in the application site, and no productionPrecipitation occurs and formation blockage is not caused.
4. The application provides low permeability reservoir CO 2 The nanometer foam oil washing agent for driving has simple production process, easily purchased raw materials, no organic chlorine, no harm to the environment and personnel from production to use and meeting the requirements of green environmental protection.
Detailed Description
The following description of the technical solutions in the embodiments of the present application will be clear and complete, and it is obvious that the described embodiments are only some embodiments of the present application, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.
The raw materials in the embodiment of the application are all purchased through commercial paths, the nano surfactant WX302S is purchased from Ningbofeng Chengnano technology Co., ltd, the nonionic surfactant isomeric fatty decaol polyoxyethylene ether is purchased from Jiangsu sea Ann petrochemical plant, and the other is a commercial product.
Example 1
Preheating 220kg of cocoyl methyl sodium taurate to above 40 ℃ in advance (melting into liquid state from solid state), adding into a reaction kettle, adding 50kg of ethanol, stirring uniformly at 40-50 ℃, adding 380kg of water, stirring for 30min, adding 150kg of heterogeneous fatty deca-alcohol polyoxyethylene ether (n=5) and 200kg of nano surfactant WX302S, and stirring uniformly to obtain low-permeability oil reservoir CO 2 The nanometer foam oil washing agent is used for driving.
Example 2
Preheating 200kg of cocoyl methyl sodium taurate to above 40 ℃ in advance (melting into liquid state from solid state), adding into a reaction kettle, adding 50kg of isopropanol, stirring uniformly at 40-50 ℃, adding 380kg of water, stirring for 25min, adding 160kg of heterogeneous fatty deca-alcohol polyoxyethylene ether (n=6) and 210kg of nano surfactant WX302S, and stirring uniformly to obtain low-permeability oil reservoir CO 2 The nanometer foam oil washing agent is used for driving.
Example 3
180kg of cocoyl methyl sodium taurate is preheated to more than 40 ℃ in advance (melted into liquid state from solid state), then added into a reaction kettle, then 50kg of ethanol is added, after being uniformly stirred at the temperature of 40-50 ℃, 380kg of water is added, and the mixture is stirred for 30min, finally 170kg of heterogeneous fatty deca-alcohol polyoxyethylene ether (n=7) and 220kg of nano surfactant WX302S are added, and after being fully and uniformly stirred, the low-permeability oil deposit CO is obtained 2 The nanometer foam oil washing agent is used for driving.
Example 4
160kg of cocoyl methyl sodium taurate is preheated to more than 40 ℃ in advance (is melted into liquid state from solid state), then is added into a reaction kettle, 50kg of isopropanol is added, after being uniformly stirred at the temperature of 40-50 ℃, 380kg of water is added, the stirring is carried out for 35min, finally 180kg of heterogeneous fatty deca-alcohol polyoxyethylene ether (n=8) and 230kg of nano surfactant WX302S are added, and after being fully and uniformly stirred, low-permeability oil deposit CO is obtained 2 The nanometer foam oil washing agent is used for driving.
Example 5
140kg of cocoyl methyl sodium taurate is preheated to more than 40 ℃ in advance (is melted into liquid state from solid state), then added into a reaction kettle, 50kg of ethanol is added, after being uniformly stirred at the temperature of 40-50 ℃, 380kg of water is added, the stirring is carried out for 40min, finally 190kg of heterogeneous fatty deca-alcohol polyoxyethylene ether (n=9) and 240kg of nano surfactant WX302S are added, and after being fully and uniformly stirred, low permeability oil deposit CO is obtained 2 The nanometer foam oil washing agent is used for driving.
Example 6
Preheating 120kg of cocoyl methyl sodium taurate to above 40 ℃ in advance (melting into liquid state from solid state), adding into a reaction kettle, adding 50kg of isopropanol, stirring uniformly at 40-50 ℃, adding 380kg of water, stirring for 20min, adding 200kg of isomeric fatty deca-alcohol polyoxyethylene ether (n=10) and 250kg of nano surfactant WX302S, and stirring uniformly to obtain low-permeability oil reservoir CO 2 The nanometer foam oil washing agent is used for driving.
The application provides low permeability reservoir CO 2 The components and the proportion of the nano foam oil washing agent for driving are determined on the basis of a large number of experiments, and any change can cause detectionAnd (5) failing the measurement index.
Comparative example 1
600kg of water is added into a reaction kettle, 50kg of ethanol, 150kg of isomeric fatty deca-alcohol polyoxyethylene ether (n=5) and 200kg of nano surfactant WX302S are added in turn, and the mixture is stirred uniformly at the temperature of 40-50 ℃ to obtain low-permeability oil reservoir CO 2 The nanometer foam oil washing agent is used for driving.
Comparative example 1 is a low permeability reservoir CO obtained by removing sodium cocoyl methyl taurate from the formulation of example 1 2 The nanometer foam oil washing agent for driving is characterized in that the amount of cocoyl methyl taurine sodium is supplemented by water.
Comparative example 2
Preheating 220kg of cocoyl methyl sodium taurate to above 40 ℃ in advance (melting into liquid state from solid state), adding into a reaction kettle, adding 50kg of ethanol, stirring uniformly at 40-50 ℃, adding 530kg of water, stirring for 30min, adding 200kg of nano surfactant WX302S, and stirring uniformly to obtain low-permeability oil reservoir CO 2 The nanometer foam oil washing agent is used for driving.
Comparative example 2 is a low permeability reservoir CO obtained by removing the isomeric fatty decaalcohol polyoxyethylene ethers in the formulation of example 1 2 The nanometer foam oil washing agent for driving is characterized in that the amount of the heterogeneous fatty decaol polyoxyethylene ether is supplemented by water.
Comparative example 3
Preheating 220kg of cocoyl methyl sodium taurate to above 40 ℃ in advance (melting into liquid state from solid state), adding into a reaction kettle, adding 50kg of ethanol, stirring uniformly at 40-50 ℃, adding 580kg of water, stirring for 30min, adding 150kg of isomeric fatty deca-alcohol polyoxyethylene ether (n=5), and stirring uniformly to obtain low-permeability oil reservoir CO 2 The nanometer foam oil washing agent is used for driving.
Comparative example 3 Low permeability reservoir CO obtained by removing the nano surfactant WX302S from the formulation of example 1 2 The nanometer foam oil washing agent for driving is prepared by supplementing the amount of the nanometer surfactant WX302S with water.
Comparative example 4
110kg of cocoyl methyl tauratePreheating sodium to above 40deg.C (melting into liquid state from solid state), adding into a reaction kettle, adding 50kg ethanol, stirring at 40-50deg.C, adding 490kg water, stirring for 30min, adding 150kg of heterogeneous fatty deca-alcohol polyoxyethylene ether (n=5) and 200kg of nano surfactant WX302S, and stirring thoroughly to obtain low-permeability oil reservoir CO 2 The nanometer foam oil washing agent is used for driving.
Comparative example 4 is a low permeability reservoir CO obtained by adding 110kg sodium cocoyl methyl taurate (11%) to a cocoyl methyl taurate of the formulation of example 1, which deviates from the range of 12% -22% 2 The nanometer foam oil washing agent is used for driving, and the small amount of cocoyl methyl taurine sodium is supplemented by water.
Comparative example 5
Preheating 230kg of cocoyl methyl sodium taurate to above 40 ℃ in advance (melting into liquid state from solid state), adding into a reaction kettle, adding 50kg of ethanol, stirring uniformly at 40-50 ℃, adding 370kg of water, stirring for 30min, adding 150kg of heterogeneous fatty deca-alcohol polyoxyethylene ether (n=5) and 200kg of nano surfactant WX302S, and stirring uniformly to obtain low-permeability oil reservoir CO 2 The nanometer foam oil washing agent is used for driving.
Comparative example 5A low permeability reservoir CO obtained by adding 230kg sodium cocoyl methyl taurate (23%) to the formulation of example 1, with sodium cocoyl methyl taurate ranging from 12% to 22% 2 The amount of added cocoyl methyl taurate is removed from the amount of water with the nanofoam wash.
Comparative example 6
Preheating 220kg of cocoyl methyl sodium taurate to above 40 ℃ in advance (melting into liquid state from solid state), adding into a reaction kettle, adding 50kg of ethanol, stirring uniformly at 40-50 ℃, adding 390kg of water, stirring for 30min, adding 140kg of heterogeneous fatty deca-alcohol polyoxyethylene ether (n=5) and 200kg of nano surfactant WX302S, and stirring uniformly to obtain low-permeability oil reservoir CO 2 The nanometer foam oil washing agent is used for driving.
Comparative example 6 is an isopipe in the formulation of example 1Fatty alcohol polyoxyethylene ether deviates from the range of 15% -20%, namely 140kg of heterogeneous fatty alcohol polyoxyethylene ether (14%) is added to obtain low-permeability oil reservoir CO 2 The nanometer foam oil washing agent is used for driving, and the small amount of the heterogeneous fatty decaol polyoxyethylene ether is supplemented by water.
Comparative example 7
Preheating 220kg of cocoyl methyl sodium taurate to above 40 ℃ in advance (melting into liquid state from solid state), adding into a reaction kettle, adding 50kg of ethanol, stirring uniformly at 40-50 ℃, adding 320kg of water, stirring for 30min, adding 210kg of isomeric fatty deca-alcohol polyoxyethylene ether (n=5) and 200kg of nano surfactant WX302S, and stirring uniformly to obtain low-permeability oil reservoir CO 2 The nanometer foam oil washing agent is used for driving.
Comparative example 7 is a low permeability reservoir CO obtained by adding 210kg of the isomeric fatty decaalcohol polyoxyethylene ether (21%) to the formula of example 1, wherein the isomeric fatty decaalcohol polyoxyethylene ether deviates from the range of 15% -20% 2 The amount of the added heterogeneous fatty decaol polyoxyethylene ether is removed from the amount of water by using the nano foam oil washing agent.
Comparative example 8
Preheating 220kg of cocoyl methyl sodium taurate to above 40 ℃ in advance (melting into liquid state from solid state), adding into a reaction kettle, adding 50kg of ethanol, stirring uniformly at 40-50 ℃, adding 390kg of water, stirring for 30min, adding 150kg of heterogeneous fatty deca-alcohol polyoxyethylene ether (n=5) and 190kg of nano surfactant WX302S, and stirring uniformly to obtain low-permeability oil reservoir CO 2 The nanometer foam oil washing agent is used for driving.
Comparative example 8 is a low permeability reservoir CO obtained by adding 190kg of the nano-surfactant WX302S (19%) to the nano-surfactant WX302S in the formulation of example 1, which deviates from the range of 20% -25% 2 The amount of the nano-surfactant WX302S added in the nano-foam oil washing agent for driving is supplemented by water.
Comparative example 9
220kg of sodium cocoyl methyl taurate is preheated to more than 40 ℃ in advance (melted from solid state to liquid state) and then added into the reactionAdding 50kg of ethanol into a kettle, stirring uniformly at 40-50deg.C, adding 320kg of water, stirring for 30min, adding 150kg of heterogeneous fatty deca-alcohol polyoxyethylene ether (n=5) and 260kg of nano surfactant WX302S, and stirring uniformly to obtain low-permeability oil reservoir CO 2 The nanometer foam oil washing agent is used for driving.
Comparative example 9 is a low permeability reservoir CO obtained by adding 260kg of the nano-surfactant WX302S (26%) to the nano-surfactant WX302S in the formulation of example 1, which deviates from the range of 20% -25% 2 The amount of the added nano surfactant WX302S is removed from the amount of water by the nano foam oil wash.
Performance testing
The products prepared in the above examples and comparative examples were formulated at a concentration of 0.5wt% for performance testing, under the following test conditions and test methods:
test conditions
Test instrument: TX-500C type full-range rotary interface tension measuring instrument, multiparameter dynamic foam assessment instrument (French TECLIS company), constant temperature drying oven and super constant temperature water bath.
Test temperature: interfacial tension testing, foam performance testing and wash rate testing were performed according to reservoir temperature 60 ℃.
Test oil: a certain block of the victory oil field dewaters crude oil.
Test water: water is injected into a certain block of the victory oil field, the mineralization degree is 100000mg/L, and the calcium and magnesium ion concentration is 2000mg/L.
Test method
1. Preparing a test solution: CO from low permeability reservoirs prepared as described above 2 The nano foam oil washing agent for driving is prepared into aqueous solution with the concentration of 0.5 weight percent by injecting water into a certain area of a victory oil field.
2. Foam performance test:
the foam volume and half life of the formulated test solution were tested using a multiparameter dynamic foam assessor (TECLIS, france).
2.1 starting the super constant temperature water bath to ensure that the temperature of the super constant temperature water bath is stabilized at (60+/-0.1), and simultaneously placing the prepared test solution into the water bath for preheating.
2.2 turning on the power switch of the multi-parameter dynamic foam assessment instrument and the air source switch of high-purity CO2 (purity > 99.99%). Before the experiment, the inner wall of the test tube is washed by distilled water, then the inner wall of the test tube is washed by the liquid to be tested, and the washing is completely and fully carried out until the inner wall has no residual foam.
2.3, after the calibration is qualified, setting the air flow speed to be 100mL/min, the air charging time to be 100s, clicking the start, entering a multi-parameter dynamic evaluation interface, and starting an experiment. After the inflation is finished, the air source is closed. During the experiment, attention was paid to observe until the half-life of the foam appears, click "stop" and end the experiment.
2.4, making a change curve of the instantaneous foam Volume (VF) with time (t), taking the maximum instantaneous volume of the foam generated after the gas is filled in the test tube as the foaming volume, and finding the time taken for the foam volume to decay from the maximum to half is the half-life period (t 1/2F) of the foam.
3. Interfacial tension test: the interfacial tension between the sample and the target block oil was measured at 60℃as specified in SY/T5370-2018 at 7.3.4 (rotational speed 5000r/min, density difference calculated as 0.1) and the lowest interfacial tension was recorded.
4. And (3) washing oil rate test:
4.1 mixing simulated stratum sand and crude oil of a target block according to the ratio (mass ratio) of 4:1, putting the mixture into a constant temperature drying oven, aging for 7d at the reservoir temperature, stirring for 1 time every day, and uniformly mixing the oil sand.
4.2 preparation of 0.5wt% sample solution 100g with target block injection water, stirring on a magnetic stirrer at 300r/min for 15min, and testing.
4.3 weighing about 5g of aged oil sand, placing into a 100mL conical flask, and weighing to obtain m 1 Accurate to 0.001g.
4.4 50g of the prepared sample solution was added to the 4.3 sample, and the mixture was allowed to stand at reservoir temperature for 48 hours after thorough mixing.
4.5 dipping the crude oil floating in the sample solution after standing of 4.4 and the crude oil adhered to the bottle wall with clean cotton yarn, pouring out the sample solution, placing the conical flask in an oven at 105 DEG CBaking to constant weight to obtain m 2 。
4.6 crude oil elution was performed on the sample of 4.5 with petroleum ether until the petroleum ether was colorless. Drying the eluted crude oil in a 120 deg.c oven to constant weight to obtain m 3 。
4.7 the wash oil ratio was calculated as follows:
wherein:
sigma-wash rate;
m 1 -total mass of conical flask and oil sand before washing oil, g;
m 2 the mass g of the conical flask and the oil sand after oil washing;
m 3 -total mass of erlenmeyer flask and washed formation sand, g.
The low permeability reservoirs CO obtained in examples 1-6 and comparative examples 1-9 above were treated 2 The nano foam oil-washing agent for driving is used for testing interfacial tension, foam performance and oil-washing rate according to the testing method, and the testing results are shown in table 1. Wherein, referring to several relevant standards, the following parameters are: interfacial tension is less than or equal to 5 multiplied by 10 -3 mN/m, foaming volume not less than 200mL, foam half-life not less than 60min, and wash oil rate not less than 90%.
TABLE 1 Low permeability reservoir CO 2 Performance test of nano foam oil-washing agent for driving
As can be seen from the above Table 1, the formulation provided by the present application can make the obtained low permeability under the synergistic effect of the nano surfactant WX302S, the anionic surfactant, the nonionic surfactant and the component ratios thereofReservoir CO 2 The nano foam oil-washing agent for driving has interfacial tension less than or equal to 3.6X10 -3 mN/m, foaming volume not less than 215mL, foam half-life not less than 75min, wash oil rate not less than 92.0%, and the like, and can remarkably improve CO 2 The sweep volume of the flooding can improve the oil washing efficiency, achieve the purpose of double effects of one dose, and be applied to low-permeability oil reservoir CO 2 Can improve CO in flooding to a certain extent 2 Recovery ratio of the drive. If a component is absent or used in an amount outside the range defined in the present application, the detected index is affected to be unacceptable.
Claims (5)
1. Low permeability reservoir CO 2 The nanometer foam oil washing agent for driving is characterized by comprising 20-25% of nanometer surfactant, 12-22% of anionic surfactant, 15-20% of nonionic surfactant, 5% of low-carbon alcohol and the balance of water in percentage by mass;
the nano surfactant is a nano surfactant with the code of WX302S which is commercially available from Ningbo Feng Cheng nano technology Co-Ltd, and the particle size is less than or equal to 200nm;
the anionic surfactant is sodium cocoyl methyl taurate, and the molecular formula is as follows:
RCON(CH 3 )CH 2 CH 2 SO 3 Na
wherein R represents coconut oleic acid;
the nonionic surfactant is isomeric fatty decaalcohol polyoxyethylene ether, and the molecular formula is as follows:
RO(CH 2 CH 2 O) n H
wherein r=c 10 H 21 N is any one value selected from 5, 6, 7, 8, 9 and 10;
when the oil washing agent is compatible with water with the mineralization degree less than or equal to 100000mg/L and the calcium and magnesium ion concentration less than or equal to 2000mg/L, the interfacial tension is less than or equal to 3.6X10 -3 mN/m, foaming volume not less than 215mL, foam half-life not less than 75min, and wash oil rate not less than 92.0%.
2. The nanofoam oil washing agent according to claim 1, wherein the lower alcohol is at least one selected from ethanol and isopropanol.
3. The low permeability reservoir CO of claim 1 or 2 2 The preparation method of the nanometer foam oil washing agent for driving is characterized by comprising the following steps of:
preheating anionic surfactant to above 40deg.C in advance to melt it from solid state to liquid state, adding into a reaction kettle, adding low-carbon alcohol, stirring at 40-50deg.C, adding water, stirring for 20-40min, adding nonionic surfactant and nano surfactant, and stirring to obtain low-permeability oil reservoir CO 2 The nanometer foam oil washing agent is used for driving.
4. The low permeability reservoir CO of claim 1 or 2 2 The nano foam oil-washing agent for driving has permeability of (0.1-50) x 10 when the stratum temperature is less than or equal to 150 DEG C -3 μm 2 Low-permeability oil reservoir CO with stratum water mineralization less than or equal to 100000mg/L and calcium and magnesium ion concentration less than or equal to 2000mg/L 2 Application in flooding.
5. The use of claim 4, wherein the low permeability reservoir CO 2 The use concentration of the nano foam oil washing agent for driving is 0.5 weight percent.
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