CN117264616A - Nanometer oil displacement agent and preparation method thereof - Google Patents
Nanometer oil displacement agent and preparation method thereof Download PDFInfo
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- CN117264616A CN117264616A CN202210678008.8A CN202210678008A CN117264616A CN 117264616 A CN117264616 A CN 117264616A CN 202210678008 A CN202210678008 A CN 202210678008A CN 117264616 A CN117264616 A CN 117264616A
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- 238000006073 displacement reaction Methods 0.000 title claims abstract description 138
- 238000002360 preparation method Methods 0.000 title claims abstract description 25
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 166
- 239000002245 particle Substances 0.000 claims abstract description 43
- 239000004094 surface-active agent Substances 0.000 claims abstract description 41
- 239000000126 substance Substances 0.000 claims abstract description 35
- 239000007788 liquid Substances 0.000 claims abstract description 33
- 229920000642 polymer Polymers 0.000 claims abstract description 33
- 238000000034 method Methods 0.000 claims abstract description 23
- 238000001035 drying Methods 0.000 claims abstract description 22
- 238000002156 mixing Methods 0.000 claims abstract description 19
- 239000003876 biosurfactant Substances 0.000 claims abstract description 16
- 239000000843 powder Substances 0.000 claims abstract description 15
- 238000000227 grinding Methods 0.000 claims abstract description 5
- 239000002904 solvent Substances 0.000 claims abstract description 5
- 229920002401 polyacrylamide Polymers 0.000 claims description 28
- 229910000831 Steel Inorganic materials 0.000 claims description 11
- 239000010959 steel Substances 0.000 claims description 11
- 238000000855 fermentation Methods 0.000 claims description 8
- 230000004151 fermentation Effects 0.000 claims description 8
- FCBUKWWQSZQDDI-UHFFFAOYSA-N rhamnolipid Chemical compound CCCCCCCC(CC(O)=O)OC(=O)CC(CCCCCCC)OC1OC(C)C(O)C(O)C1OC1C(O)C(O)C(O)C(C)O1 FCBUKWWQSZQDDI-UHFFFAOYSA-N 0.000 claims description 7
- 239000011550 stock solution Substances 0.000 claims description 7
- 102000004169 proteins and genes Human genes 0.000 claims description 6
- 108090000623 proteins and genes Proteins 0.000 claims description 6
- 150000002191 fatty alcohols Chemical class 0.000 claims description 4
- 150000004676 glycans Chemical class 0.000 claims description 4
- 229920001282 polysaccharide Polymers 0.000 claims description 4
- 239000005017 polysaccharide Substances 0.000 claims description 4
- HVCOBJNICQPDBP-UHFFFAOYSA-N 3-[3-[3,5-dihydroxy-6-methyl-4-(3,4,5-trihydroxy-6-methyloxan-2-yl)oxyoxan-2-yl]oxydecanoyloxy]decanoic acid;hydrate Chemical compound O.OC1C(OC(CC(=O)OC(CCCCCCC)CC(O)=O)CCCCCCC)OC(C)C(O)C1OC1C(O)C(O)C(O)C(C)O1 HVCOBJNICQPDBP-UHFFFAOYSA-N 0.000 claims description 3
- 229930186217 Glycolipid Natural products 0.000 claims description 3
- 125000004432 carbon atom Chemical group C* 0.000 claims description 2
- 238000005119 centrifugation Methods 0.000 claims description 2
- 125000005456 glyceride group Chemical group 0.000 claims description 2
- 125000000373 fatty alcohol group Chemical group 0.000 claims 1
- 230000000694 effects Effects 0.000 abstract description 14
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract description 14
- 238000001179 sorption measurement Methods 0.000 abstract description 4
- 239000000084 colloidal system Substances 0.000 abstract description 3
- 238000005516 engineering process Methods 0.000 abstract description 3
- 239000003208 petroleum Substances 0.000 abstract description 3
- 238000012545 processing Methods 0.000 abstract description 3
- 230000009467 reduction Effects 0.000 abstract description 3
- 239000003921 oil Substances 0.000 description 128
- 235000019198 oils Nutrition 0.000 description 126
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 22
- 239000007787 solid Substances 0.000 description 14
- 238000002347 injection Methods 0.000 description 8
- 239000007924 injection Substances 0.000 description 8
- 239000003960 organic solvent Substances 0.000 description 8
- 239000000243 solution Substances 0.000 description 8
- 239000004005 microsphere Substances 0.000 description 7
- 230000000052 comparative effect Effects 0.000 description 6
- 239000011435 rock Substances 0.000 description 6
- 239000000377 silicon dioxide Substances 0.000 description 6
- 238000006243 chemical reaction Methods 0.000 description 5
- 239000000725 suspension Substances 0.000 description 5
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 4
- 230000002411 adverse Effects 0.000 description 4
- 150000001875 compounds Chemical class 0.000 description 4
- 238000011161 development Methods 0.000 description 4
- 230000018109 developmental process Effects 0.000 description 4
- 230000004048 modification Effects 0.000 description 4
- 238000012986 modification Methods 0.000 description 4
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 description 3
- 239000006087 Silane Coupling Agent Substances 0.000 description 3
- 239000005543 nano-size silicon particle Substances 0.000 description 3
- 230000035699 permeability Effects 0.000 description 3
- 239000002994 raw material Substances 0.000 description 3
- 230000004075 alteration Effects 0.000 description 2
- 239000007822 coupling agent Substances 0.000 description 2
- 239000012043 crude product Substances 0.000 description 2
- 238000002474 experimental method Methods 0.000 description 2
- 238000010528 free radical solution polymerization reaction Methods 0.000 description 2
- 239000002086 nanomaterial Substances 0.000 description 2
- 239000002105 nanoparticle Substances 0.000 description 2
- 238000006116 polymerization reaction Methods 0.000 description 2
- 239000011148 porous material Substances 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 235000015112 vegetable and seed oil Nutrition 0.000 description 2
- 239000008158 vegetable oil Substances 0.000 description 2
- WYTZZXDRDKSJID-UHFFFAOYSA-N (3-aminopropyl)triethoxysilane Chemical compound CCO[Si](OCC)(OCC)CCCN WYTZZXDRDKSJID-UHFFFAOYSA-N 0.000 description 1
- HZAXFHJVJLSVMW-UHFFFAOYSA-N 2-Aminoethan-1-ol Chemical compound NCCO HZAXFHJVJLSVMW-UHFFFAOYSA-N 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 230000032683 aging Effects 0.000 description 1
- 239000003513 alkali Substances 0.000 description 1
- 230000009435 amidation Effects 0.000 description 1
- 238000007112 amidation reaction Methods 0.000 description 1
- 239000010775 animal oil Substances 0.000 description 1
- 230000001580 bacterial effect Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 239000003153 chemical reaction reagent Substances 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 239000003431 cross linking reagent Substances 0.000 description 1
- 235000014113 dietary fatty acids Nutrition 0.000 description 1
- 239000012153 distilled water Substances 0.000 description 1
- 230000032050 esterification Effects 0.000 description 1
- 238000005886 esterification reaction 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
- 238000001914 filtration Methods 0.000 description 1
- 238000005189 flocculation Methods 0.000 description 1
- 230000016615 flocculation Effects 0.000 description 1
- 239000000295 fuel oil Substances 0.000 description 1
- 150000002313 glycerolipids Chemical class 0.000 description 1
- 238000011065 in-situ storage Methods 0.000 description 1
- 239000003999 initiator Substances 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- FPYJFEHAWHCUMM-UHFFFAOYSA-N maleic anhydride Chemical compound O=C1OC(=O)C=C1 FPYJFEHAWHCUMM-UHFFFAOYSA-N 0.000 description 1
- 239000000178 monomer Substances 0.000 description 1
- 239000011943 nanocatalyst Substances 0.000 description 1
- 102000039446 nucleic acids Human genes 0.000 description 1
- 108020004707 nucleic acids Proteins 0.000 description 1
- 150000007523 nucleic acids Chemical class 0.000 description 1
- 239000003129 oil well Substances 0.000 description 1
- 230000000704 physical effect Effects 0.000 description 1
- BHZRJJOHZFYXTO-UHFFFAOYSA-L potassium sulfite Chemical compound [K+].[K+].[O-]S([O-])=O BHZRJJOHZFYXTO-UHFFFAOYSA-L 0.000 description 1
- 235000019252 potassium sulphite Nutrition 0.000 description 1
- 239000002243 precursor Substances 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 229920006395 saturated elastomer Polymers 0.000 description 1
- 238000009738 saturating Methods 0.000 description 1
- 235000012239 silicon dioxide Nutrition 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
- 238000006277 sulfonation reaction Methods 0.000 description 1
- 238000005406 washing 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
- C09K8/584—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
-
- 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
- C09K8/588—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 polymers
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K2208/00—Aspects relating to compositions of drilling or well treatment fluids
- C09K2208/10—Nanoparticle-containing well treatment fluids
-
- 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
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A20/00—Water conservation; Efficient water supply; Efficient water use
- Y02A20/20—Controlling water pollution; Waste water treatment
- Y02A20/204—Keeping clear the surface of open water from oil spills
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- Chemical & Material Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Colloid Chemistry (AREA)
Abstract
The invention particularly relates to a nano oil displacement agent and a preparation method thereof, belonging to the technical field of petroleum exploitation, wherein the method comprises the following steps: mixing a biosurfactant, a chemical surfactant, a polymer and a profile control agent to obtain oil displacement agent liquid; drying the oil displacement agent liquid to obtain oil displacement agent powder; grinding the oil displacement agent powder to obtain oil displacement agent particles; mixing the oil displacement agent particles with a solvent to obtain a nano oil displacement agent; the physical processing technology is adopted, the cost is low, the environment is protected, the yield is high, the oil is automatically found after being injected into an oil reservoir along with a well, a stable adsorption layer is formed on a discretized oil-water interface, oil drops are gathered, and the oil drops enter the thick oil to damage colloid and asphaltene molecule entanglement, so that the viscosity reduction effect of the oil reservoir is realized.
Description
Technical Field
The invention belongs to the technical field of petroleum exploitation, and particularly relates to a nano oil displacement agent and a preparation method thereof.
Background
Low permeability-dense oil and gas resources are important in the global energy landscape. Since the 21 st century, the proportion of low permeability-tight oil and gas exploration reserves in the total annual newly increased exploration reserves increased from 35% to 70% (statistical data in 2014). The low-permeability and dense oil gas reserves in China for nearly 5 years account for 70% -80% of the ascertained oil gas reserves, the low-permeability and dense oil gas resources become the main body of Chinese oil gas development gradually, and the proportion of the low-permeability and dense oil gas reserves in the oil gas yield rises year by year. But the low-permeability-dense reservoir has the characteristics of low porosity, low permeability, small pore throat, complex pore structure and the like, so that the problems of difficult exploitation, low recovery ratio, rapid yield decrease and the like are caused, and the difficulty of exploration and development is high. At present, the development of low-permeability and dense oil reservoirs generally has the problems of high starting pressure gradient, insufficient natural energy and the like, and stratum energy needs to be supplemented by adopting modes of high-pressure water injection, advanced water injection and the like. However, due to poor physical properties of a reservoir, the stratum pressure around the water injection well is continuously increased due to long-term water injection, and high-pressure underinjection is often caused; and the high pressure causes micro-cracks in the stratum, and the oil well is in danger of sudden flooding along with the dynamic extension of the cracks, so that the development effect of the oil field is seriously affected. In recent years, nanotechnology has rapidly developed and has been widely used in various fields such as biology, medical treatment, aviation, military and energy. Researchers at home and abroad combine various properties of the nano material to try to apply the nano material to various directions in the petroleum industry, and particularly, a great amount of basic work is done in the aspect of low-permeability and dense oil gas exploitation.
In the prior art, chinese patent application CN201710674739.4 is a nano silicon dioxide dispersion liquid with amphiphilic property and double particle structure and a preparation method thereof. The preparation method comprises the following steps: preparing lipophilic modified nano silica alcohol sol serving as a first reaction solution by adding a silane coupling agent containing lipophilic groups into the nano silica alcohol sol serving as a raw material; preparing hydrophilic modified nano silica alcohol sol serving as a second reaction solution by adding a silane coupling agent containing hydrophilic groups into the nano silica alcohol sol serving as a raw material; adding 3-aminopropyl triethoxysilane into the first reaction solution, stirring, and mixing with the second reaction solution to obtain the nano silicon dioxide dispersion liquid with amphiphilic property and double particle structure. The invention also provides the nano silicon dioxide dispersion liquid with the amphipathic property and the double particle structure, which is prepared by the preparation method. The composite material has the advantages of hydrophilicity, lipophilicity, double particle structure, particle size smaller than 100nm, simple preparation process and low cost. Chinese patent application CN201310094841.9 is a temperature-sensitive modified silica nanoparticle, and a preparation method and application thereof. The preparation method comprises the following steps: adding alkali liquor into the mixed liquor of the precursor and the solvent, and reacting to obtain a silicon dioxide nanometer microsphere suspension; adding a silane coupling agent into the silica nano microsphere suspension, and reacting to obtain a coupling agent modified silica nano microsphere suspension; adding a temperature-sensitive polymer monomer, a cross-linking agent and an initiator into the coupling agent modified silica nano microsphere suspension, and performing polymerization reaction to obtain a temperature-sensitive modified silica nano microsphere crude product; and cooling, filtering, washing and drying the temperature-sensitive modified silica nano microsphere crude product to obtain the temperature-sensitive modified silica nano microsphere. The method adopts an in-situ one-step method, so that the obtained temperature-sensitive modified silica nanoparticle has special surface property and rheological property.
Most of the nano oil displacement agents adopt a preparation process of solution polymerization, the cost is high in use, and the yield of the solution polymerization is uncontrollable.
Disclosure of Invention
The application aims to provide a nano oil displacement agent and a preparation method thereof, so as to solve the problem that the polymerization yield of the nano oil displacement agent prepared at present is uncontrollable.
The embodiment of the invention provides a preparation method of a nano oil displacement agent, which comprises the following steps:
mixing a biosurfactant, a chemical surfactant, a polymer and a profile control agent to obtain oil displacement agent liquid;
drying the oil displacement agent liquid to obtain oil displacement agent particles;
grinding the oil displacement agent powder to obtain oil displacement agent powder;
and mixing the oil displacement agent powder with a solvent to obtain the nano oil displacement agent.
Optionally, the oil displacement agent powder is ground to obtain oil displacement agent particles, which specifically comprises:
mixing and centrifuging the oil displacement agent powder and the steel balls to obtain oil displacement agent particles;
the particle size of the steel balls is 10mm-20mm, and the rotating speed of the centrifugation is 3000 rpm-5000 rpm.
Optionally, the biosurfactant comprises rhamnolipid fermentation stock solution.
Optionally, the rhamnolipid fermentation stock solution comprises the following components: the biological macromolecular protein has the mass concentration of 12.34g/L-15.12g/L, the mass concentration of glycolipid is 25.8g/L-27.6g/L, the mass concentration of polysaccharide is 4.12g/L-5.07g/L, and the mass concentration of glyceride is 22.85g/L-27.02g/L.
Optionally, the chemical surfactant has a structural formula:
wherein Rm is fatty alcohol, and the number of carbon atoms of the fatty alcohol is 8-18.
Optionally, the mass ratio of the biosurfactant to the chemical surfactant is 1:1-8, wherein in the nano oil displacement agent, the mass concentration of the chemical surfactant is less than or equal to 0.1%.
Optionally, the polymer is polyacrylamide, the molecular weight of the polyacrylamide is 800-1500 ten thousand, and the mass concentration of the polyacrylamide in the oil displacement agent liquid is 800-1200 mg/L.
Optionally, the profile control agent is a pre-crosslinked expanded particle profile control agent, and the weight ratio of the polymer to the profile control agent is 1:3-5.
Optionally, the drying temperature is 150 ℃ to 200 ℃.
Based on the same inventive concept, the embodiment of the invention also provides a nano oil displacement agent, which is prepared by adopting the preparation method of the nano oil displacement agent.
One or more technical solutions in the embodiments of the present invention at least have the following technical effects or advantages:
the preparation method of the nano oil displacement agent provided by the embodiment of the invention adopts a physical processing technology, is low in cost, green and environment-friendly, has high yield, and mechanical crushing means that under the action of crushing force, solid blocks or particles deform and break to generate finer particles, the finer particles exert an automatic oil finding function along with the injection of wells into oil reservoirs, a stable adsorption layer is formed on a discretized oil-water interface, oil drops are gathered, and colloid and asphaltene molecules are damaged by entering the thick oil, so that the viscosity reduction effect of the oil reservoirs is realized.
The foregoing description is only an overview of the present invention, and is intended to be implemented in accordance with the teachings of the present invention in order that the same may be more clearly understood and to make the same and other objects, features and advantages of the present invention more readily apparent.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for the description of the embodiments will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a flow chart of a method provided by an embodiment of the present invention.
Detailed Description
The advantages and various effects of the present invention will be more clearly apparent from the following detailed description and examples. It will be understood by those skilled in the art that these specific embodiments and examples are intended to illustrate the invention, not to limit the invention.
Throughout the specification, unless specifically indicated otherwise, the terms used herein should be understood as meaning as commonly used in the art. Accordingly, unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. In case of conflict, the present specification will control.
Unless otherwise specifically indicated, the various raw materials, reagents, instruments, equipment and the like used in the present invention are commercially available or may be prepared by existing methods.
The technical scheme of the embodiment of the application aims to solve the technical problems, and the overall thought is as follows:
according to an exemplary embodiment of the present invention, there is provided a method for preparing a nano oil displacement agent, the method including:
s1, mixing a biological surfactant, a chemical surfactant, a polymer and a profile control agent to obtain an oil displacement agent liquid;
in some embodiments, the biosurfactant is a rhamnolipid fermentation stock solution.
In the embodiment, rhamnolipid fermentation stock solution provided by Daqing Wo Taisi chemical industry Co., ltd is adopted, and the main component of the rhamnolipid fermentation stock solution is biological macromolecular proteins (mainly bacterial cell proteins, nucleic acid proteins, polysaccharide proteins and the like) with the content of 12.34-15.12g/L; glycolipid, content 25.8-27.6g/L; polysaccharide with the content of 4.12-5.07g/L; glycerolipid, content of 22.85-27.02g/L, etc.
In some embodiments, the chemical surfactant has the structural formula:
wherein R is fatty alcohol, and m is C 8 -C 18 。
In the embodiment, the chemical surfactant is produced by Daqingfeiji chemical company, and is prepared from animal and vegetable oil fatty acid, monoethanolamine, maleic anhydride and potassium sulfite by a series of reactions such as amidation, esterification and sulfonation.
In some embodiments, the mixing weight ratio of chemical surfactant to biosurfactant broth is 1:1-8, including but not limited to: 1: 1. 1: 2. 1: 3. 1: 4. 1: 5. 1: 6. 1:7 and 1:8, 8; the effective concentration of the chemical surfactant in the compound biological oil displacement agent is 0.1wt% to 0.01wt% (below 0.1 wt%) and the effective concentration includes but is not limited to 0.01wt%, 0.03wt%, 0.05wt%, 0.07wt% and 0.1wt%.
The mixing weight ratio of the chemical surfactant to the fermentation broth of the biosurfactant is controlled to be 1:1-8, and the applicant finds that the oil displacement agent with the ratio has the best performance, and the oil displacement agent with the ratio is insufficient when the weight ratio is too large, so that the viscosity of the system is high.
In some embodiments, the polymer is polyacrylamide, the molecular weight of the polyacrylamide is 800 ten thousand to 1500 ten thousand, and the mass concentration of the polyacrylamide in the oil displacement agent liquid is 800mg/L to 1200mg/L; the viscosity of the prepared oil displacement system is 15-30 mPa.s.
The addition of the polymer can obtain better oil displacement effect, the molecular weight of the polyacrylamide is controlled to be 800-1500 ten thousand, the mass concentration is controlled to be 800-1200 mg/L, so that the control of the viscosity of the system is facilitated, the viscosity is large due to the overlarge value, and the suspension property is insufficient due to the overlarge value.
In some embodiments, the profile control agent is a pre-crosslinked expanded particulate type profile control agent, the weight ratio of the polymer to the profile control agent is 1:3-5.
The weight ratio of the polymer to the profile control agent is controlled to be 1:3-5, the surfactant is adsorbed on the polymer and the bulk-expanded particles, so that the effect is better, the adverse effect of the excessive ratio is that the prepared solution can be precipitated, and the adverse effect of the excessive ratio is that the flocculation adsorption performance is insufficient.
S2, drying the oil displacement agent liquid to obtain oil displacement agent powder;
specifically, the prepared oil displacement agent liquid is placed in a drying box at 150-200 ℃ for drying, and oil displacement agent powder is obtained.
The reason for controlling the drying temperature to be 150-200 ℃ is that the water can be completely evaporated at the temperature without affecting the oil displacement agent, the adverse effect of the excessive temperature value is that the performance of the oil displacement agent is affected, the aging is generated, and the adverse effect of the excessive temperature value is that the water is not thoroughly dried.
S3, grinding the oil displacement agent powder to obtain oil displacement agent particles;
specifically, the oil displacement agent powder after being taken out and dried is placed in a centrifugal machine, a steel ball with the diameter of 10-20mm is placed in the centrifugal machine, and 3000-5000 rpm is used for the centrifugal machine.
S4, mixing the oil displacement agent particles with a solvent to obtain the nano oil displacement agent.
In practical operation, the solid particles of the oil-displacing agent after grinding are taken out and dissolved in an organic solvent, and specifically, the organic solvent may be selected from (methanol), (vegetable oil) and the like.
According to another exemplary embodiment of the present invention, there is provided a nano oil-displacing agent prepared by the preparation method of the nano oil-displacing agent as described above.
When the nano oil displacement agent is used, the water displacement slug can be simply used for preparing the slug by using the compound biological oil displacement agent for oil displacement. Or after the water flooding slug, preparing the slug by using the polymer slug and the compound biological oil displacement agent for alternate injection.
The concentration of the compound biological oil displacement agent in the oil displacement system is 0.5wt% to 2.0wt%, preferably 1.0wt%.
The nano oil displacement agent and the preparation method thereof are described in detail below with reference to examples, comparative examples and experimental data.
Example 1
The preparation method of the nano oil displacement agent is characterized by comprising the following steps:
s1, mixing a biological surfactant, a chemical surfactant, a polymer and a profile control agent to obtain an oil displacement agent liquid;
the mass ratio of the biosurfactant to the chemical surfactant is 1:1, in the nano oil displacement agent, the mass concentration of the chemical surfactant is 0.1%; the polymer is polyacrylamide, the molecular weight of the polyacrylamide is 800 ten thousand, and the mass concentration of the polyacrylamide in the oil displacement agent liquid is 800mg/L; the profile control agent is a pre-crosslinked expanded particle profile control agent, and the weight ratio of the polymer to the profile control agent is 1:3, a step of;
s2, placing the prepared oil displacement agent liquid in a drying box at 150 ℃ for drying;
s3, taking out the dried components, placing the components into a centrifugal machine, placing 10mm steel balls in the centrifugal machine, and using 3000 rpm for the centrifugal machine;
s4, taking out the ground solid particles of the oil displacement agent, and dissolving the solid particles in an organic solvent to obtain the nano oil displacement agent.
Example 2
The preparation method of the nano oil displacement agent is characterized by comprising the following steps:
s1, mixing a biological surfactant, a chemical surfactant, a polymer and a profile control agent to obtain an oil displacement agent liquid;
the mass ratio of the biosurfactant to the chemical surfactant is 1:8, in the nano oil displacement agent, the mass concentration of the chemical surfactant is 0.08%; the polymer is polyacrylamide, the molecular weight of the polyacrylamide is 1500 ten thousand, and the mass concentration of the polyacrylamide in the oil displacement agent liquid is 1200mg/L; the profile control agent is a pre-crosslinked expanded particle profile control agent, and the weight ratio of the polymer to the profile control agent is 1:5, a step of;
s2, placing the prepared oil displacement agent liquid in a drying box at 200 ℃ for drying;
s3, taking out the dried components, placing the components into a centrifugal machine, placing steel balls with the diameter of 20mm into the centrifugal machine, and using 5000 revolutions per minute of the centrifugal machine;
s4, taking out the ground solid particles of the oil displacement agent, and dissolving the solid particles in an organic solvent to obtain the nano oil displacement agent.
Example 3
The preparation method of the nano oil displacement agent is characterized by comprising the following steps:
s1, mixing a biological surfactant, a chemical surfactant, a polymer and a profile control agent to obtain an oil displacement agent liquid;
the mass ratio of the biosurfactant to the chemical surfactant is 1:3, in the nano oil displacement agent, the mass concentration of the chemical surfactant is 0.05%; the polymer is polyacrylamide, the molecular weight of the polyacrylamide is 1100 ten thousand, and the mass concentration of the polyacrylamide in the oil displacement agent liquid is 900mg/L; the profile control agent is a pre-crosslinked expanded particle profile control agent, and the weight ratio of the polymer to the profile control agent is 1:4, a step of;
s2, placing the prepared oil displacement agent liquid in a drying box at 160 ℃ for drying;
s3, taking out the dried components, placing the components into a centrifugal machine, placing 15mm steel balls in the centrifugal machine, and using 4000 revolutions per minute of the centrifugal machine;
s4, taking out the ground solid particles of the oil displacement agent, and dissolving the solid particles in an organic solvent to obtain the nano oil displacement agent.
Example 1
The preparation method of the nano oil displacement agent is characterized by comprising the following steps:
s1, mixing a biological surfactant, a chemical surfactant, a polymer and a profile control agent to obtain an oil displacement agent liquid;
the mass ratio of the biosurfactant to the chemical surfactant is 1:6, in the nano oil displacement agent, the mass concentration of the chemical surfactant is 0.01%; the polymer is polyacrylamide, the molecular weight of the polyacrylamide is 1300 ten thousand, and the mass concentration of the polyacrylamide in the oil displacement agent liquid is 1100mg/L; the profile control agent is a pre-crosslinked expanded particle profile control agent, and the weight ratio of the polymer to the profile control agent is 1:4, a step of;
s2, placing the prepared oil displacement agent liquid in a drying box at 180 ℃ for drying;
s3, taking out the dried components, placing the components into a centrifugal machine, placing 115mm steel balls in the centrifugal machine, and using 4000 revolutions per minute of the centrifugal machine;
s4, taking out the ground solid particles of the oil displacement agent, and dissolving the solid particles in an organic solvent to obtain the nano oil displacement agent.
Comparative example 1
The preparation method of the nano oil displacement agent is characterized by comprising the following steps:
s1, mixing a biological surfactant, a chemical surfactant, a polymer and a profile control agent to obtain an oil displacement agent liquid;
the mass ratio of the biosurfactant to the chemical surfactant is 1:0.8, wherein in the nano oil displacement agent, the mass concentration of the chemical surfactant is 0.2%; the polymer is polyacrylamide, the molecular weight of the polyacrylamide is 800 ten thousand, and the mass concentration of the polyacrylamide in the oil displacement agent liquid is 800mg/L; the profile control agent is a pre-crosslinked expanded particle profile control agent, and the weight ratio of the polymer to the profile control agent is 1:3, a step of;
s2, placing the prepared oil displacement agent liquid in a drying box at 150 ℃ for drying;
s3, taking out the dried components, placing the components into a centrifugal machine, placing 10mm steel balls in the centrifugal machine, and using 3000 rpm for the centrifugal machine;
s4, taking out the ground solid particles of the oil displacement agent, and dissolving the solid particles in an organic solvent to obtain the nano oil displacement agent.
Comparative example 2
The preparation method of the nano oil displacement agent is characterized by comprising the following steps:
s1, mixing a biological surfactant, a chemical surfactant, a polymer and a profile control agent to obtain an oil displacement agent liquid;
the mass ratio of the biosurfactant to the chemical surfactant is 1:10, in the nano oil displacement agent, the mass concentration of the chemical surfactant is 0.005%; the polymer is polyacrylamide, the molecular weight of the polyacrylamide is 800 ten thousand, and the mass concentration of the polyacrylamide in the oil displacement agent liquid is 800mg/L; the profile control agent is a pre-crosslinked expanded particle profile control agent, and the weight ratio of the polymer to the profile control agent is 1:3, a step of;
s2, placing the prepared oil displacement agent liquid in a drying box at 150 ℃ for drying;
s3, taking out the dried components, placing the components into a centrifugal machine, placing 10mm steel balls in the centrifugal machine, and using 3000 rpm for the centrifugal machine;
s4, taking out the ground solid particles of the oil displacement agent, and dissolving the solid particles in an organic solvent to obtain the nano oil displacement agent.
Experimental example:
the nanocatalysts prepared in examples 1-4 and comparative examples 1-2 were tested in the following manner: adopts a rock core displacement object model experiment, and the specific experimental scheme is as follows
Core model: the method comprises the steps of adopting a low-permeability natural rock core, wherein the permeability is 0.1-1 millidarcy, and the size of the rock core is phi 25mm multiplied by 153mm;
experimental water: the experimental water is distilled water, ph=7;
experimental oil: simulated oil having a viscosity of 638.8mPa.s (70 ℃ C.) and a density of 0.945g/cm3;
experimental agent: a nano oil displacement agent;
injection rate: injection rate was 0.1mL/min;
experimental temperature: at room temperature.
The experimental method comprises the following steps: according to the requirements, the simulated oil is used for saturating the rock core, then the nano oil displacement agent is used for displacement, and the oil displacement is calculated to compare the oil displacement with the simulated saturated oil consumption, so that the oil displacement efficiency is obtained.
The results are shown in the following table.
| Viscosity of the system/mPa.s | Oil displacement efficiency/% | |
| Example 1 | 12 | 22.9 |
| Example 2 | 15 | 29.6 |
| Example 3 | 19 | 31.6 |
| Example 4 | 21 | 29.7 |
| Comparative example 1 | 13 | 11.2 |
| Comparative example 2 | 49 | 24.7 |
The nano oil displacement agent for the method is adopted for oil displacement, and the comprehensive performance of the system viscosity and the oil displacement efficiency is better.
One or more technical solutions in the embodiments of the present invention at least have the following technical effects or advantages:
(1) The method provided by the embodiment of the invention adopts a physical processing technology, is low in cost, green and environment-friendly, and has high yield;
(2) The nano oil displacement agent provided by the embodiment of the invention plays a role of 'automatic oil finding' after being injected into an oil reservoir along with a well, forms a stable adsorption layer on a discretized oil-water interface, gathers oil drops, enters the interior of heavy oil to damage colloid and asphaltene molecule intertwining knots, and realizes the viscosity reduction effect of the oil reservoir;
(3) The nano oil displacement agent provided by the embodiment of the invention can change the wettability of the rock, reduce capillary resistance, strip oil film from the surface of the rock and achieve the effect of yield increase;
(4) The nano oil displacement agent provided by the embodiment of the invention has flexibility and wettability, smoothly passes through a porous medium, and can be suitable for low permeability oil reservoir conditions.
Finally, it is also noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.
While preferred embodiments of the present invention have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. It is therefore intended that the following claims be interpreted as including the preferred embodiments and all such alterations and modifications as fall within the scope of the invention.
It will be apparent to those skilled in the art that various modifications and variations can be made to the present invention without departing from the spirit or scope of the invention. Thus, it is intended that the present invention also include such modifications and alterations insofar as they come within the scope of the appended claims or the equivalents thereof.
Claims (10)
1. The preparation method of the nano oil displacement agent is characterized by comprising the following steps:
mixing a biosurfactant, a chemical surfactant, a polymer and a profile control agent to obtain oil displacement agent liquid;
drying the oil displacement agent liquid to obtain oil displacement agent particles;
grinding the oil displacement agent powder to obtain oil displacement agent powder;
and mixing the oil displacement agent particles with a solvent to obtain the nano oil displacement agent.
2. The method for preparing the nano oil displacement agent according to claim 1, wherein the oil displacement agent powder is ground to obtain oil displacement agent particles, and the method specifically comprises the following steps:
mixing and centrifuging the oil displacement agent powder and the steel balls to obtain oil displacement agent particles;
the particle size of the steel balls is 10mm-20mm, and the rotating speed of the centrifugation is 3000 rpm-5000 rpm.
3. The method for preparing a nano-oil displacement agent according to claim 1, wherein the biosurfactant comprises rhamnolipid fermentation stock solution.
4. The method for preparing a nano oil displacement agent according to claim 3, wherein the rhamnolipid fermentation stock solution comprises the following components: the biological macromolecular protein has the mass concentration of 12.34g/L-15.12g/L, the mass concentration of glycolipid is 25.8g/L-27.6g/L, the mass concentration of polysaccharide is 4.12g/L-5.07g/L, and the mass concentration of glyceride is 22.85g/L-27.02g/L.
5. The method for preparing a nano oil displacement agent according to claim 1, wherein the chemical surfactant has a structural formula:
wherein Rm is fatty alcohol, and the number of carbon atoms of the fatty alcohol is 8-18.
6. The method for preparing the nano oil displacement agent according to claim 1, wherein the mass ratio of the biosurfactant to the chemical surfactant is 1:1-8, wherein in the nano oil displacement agent, the mass concentration of the chemical surfactant is less than or equal to 0.1%.
7. The method for preparing the nano oil displacement agent according to claim 1, wherein the polymer is polyacrylamide, the molecular weight of the polyacrylamide is 800-1500 ten thousand, and the mass concentration of the polyacrylamide in the oil displacement agent liquid is 800-1200 mg/L.
8. The method for preparing the nano oil displacement agent according to claim 1, wherein the profile control agent is a pre-crosslinked expanded particle profile control agent, and the weight ratio of the polymer to the profile control agent is 1:3-5.
9. The method for preparing a nano oil displacement agent according to claim 1, wherein the drying temperature is 150 ℃ to 200 ℃.
10. A nano oil displacement agent, which is characterized in that the nano oil displacement agent is prepared by the preparation method of any one of claims 1 to 9.
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