1003 results about "Oil displacement" patented technology

The invention discloses a foam base fluid, a preparation method and a preparation method of a temperature-resistant and salt-resistant CO2 foam flooding system.The foam base fluid comprises a foaming agent, a foam stabilizer and water, the foaming agent is a betaine type surfactant, and the foam stabilizer is a biological polysaccharide polymer. A temperature-resistant and salt-resistant foam base solution and a biological polysaccharide reinforced CO2 foam oil displacement system are obtained by introducing a biological polysaccharide polymer as a foam stabilizer and combining with a betaine type surfactant, so that the problem that the viscosity of polyacrylamide as a traditional foam stabilizer is reduced and even fails in a high-temperature and high-salt environment is effectively solved; the stability of CO2 foam can be obviously improved. Meanwhile, the biological polysaccharide polymer has the characteristics of environmental friendliness and degradability, and can effectively reduce the negative influence on the environment. In addition, due to rich resources and low price of the biological polysaccharide, the system is competitive in cost, and the economic benefit of the oil field can be further improved.

The invention discloses a synthesis method of amphiphilic quantum dots and application of the amphiphilic quantum dots in nano oil displacement, and belongs to the field of nano oil displacement. The synthesis method comprises the following steps: heating a mixture containing a carbon source and a nitrogen source in an air atmosphere for reaction, and centrifuging, filtering and drying a reaction product to obtain the amphiphilic quantum dots, the carbon source is selected from at least one of glucose, mannose, citric acid, lignin, chitosan and starch; the nitrogen source is selected from at least one of alkylamine, and the carbon chain length of the alkylamine is C6 to C12. The synthesis method is simple, heating of a high-pressure reaction kettle is not needed, the technological process is simple, and the method is suitable for large-scale industrial production; the series of amphiphilic carbon quantum dots show better solubility and higher absolute fluorescence quantum yield in water and various organic solvents.

The invention relates to the technical field of oil-displacing agents, and particularly discloses a targeted nano oil-displacing agent and a preparation method thereof. A preparation method of a targeted nano oil displacement agent comprises the following steps: S1, dispersing 10-30 parts by mass of silanized inorganic nanoparticles in an alcoholic solution, adding 5-12 parts by mass of a functional monomer, 8-20 parts by mass of a hydrophilic monomer and 5-15 parts by mass of a hydrophobic monomer in an inert atmosphere, uniformly mixing, heating to 75-85 DEG C, adding an initiator, carrying out a constant temperature reaction for 4-6 h, and cooling to obtain a pre-grafted nanoparticle dispersion liquid; s2, mixing the pre-grafted nanoparticle dispersion liquid with a composite surfactant, adjusting the pH value to 6.5-7.5, and mixing at 30-40 DEG C for 22-26 hours to obtain the targeted nano oil displacement agent, the targeting type nano oil displacement agent prepared by the invention can still keep excellent dispersion stability and ultralow interfacial tension under the condition of a high-salt oil reservoir, so that the oil displacement efficiency is remarkably improved.

The invention relates to the technical field of CO2 miscible-phase oil displacement, in particular to an ester gas-soluble surfactant for reducing CO2 miscible-phase pressure and a preparation method and application thereof.The ester gas-soluble surfactant is prepared from polyglycerol fatty acid ester and acetic anhydride, the ester gas-soluble surfactant contains unsaturated hydrocarbon chains with the carbon atom number being 8-18, and the unsaturated hydrocarbon chains are connected with the polyglycerol fatty acid ester. N is the polymerization degree of the polyglycerol fatty acid ester, n is any integer in the range of 2-22, and the ester gas-soluble surfactant has the solubility of 0.5 wt%-1.5 wt% in supercritical carbon dioxide. When the ester gas-soluble surfactant provided by the invention is used, other auxiliaries do not need to be added, and a good mixing reduction effect can be achieved aiming at different crude oils by adjusting the number of carbon dioxide-philic groups and the length of oleophylic unsaturated hydrocarbon chains.

The invention relates to the technical field of unconventional oil and gas development, in particular to a system and a method for simulating gas-water alternation multi-turn pressing-braising injection and production oil displacement. According to the scheme, a pressing fracture network and a matrix reservoir are equivalently simulated, and pressing-braising injection and production of well soaking time are reasonably considered, so that the result is more accurate, and the oil displacement efficiency is improved. After the fracture core clamping unit and the matrix core clamping unit are exchanged in the forward direction and the reverse direction, a compact core is rapidly saturated, the oil reservoir initialization time is shortened, the influence of multiple fracture parameters on oil displacement in the three stages of pressing, braising and mining can be considered without repeatedly disassembling and assembling the core clamping unit, the fracture form is changed by replacing the fracture forming core, and the oil displacement efficiency is improved. The influence rule of a water-gas composite medium on the oil well pressing-braising-production capacity under different storage and seepage modes can be researched, the different storage and seepage modes comprise a multi-stage fracture-matrix reservoir, a large fracture-matrix reservoir, a micro-fracture-matrix reservoir and an original matrix reservoir, and independence and integrity of a fracture core and a matrix core are ensured; the experiment time is greatly shortened.

The invention relates to the field of oil and gas exploration and development displacement testing, provides a preparation and experiment method of a visual large-size planar heterogeneous core, and provides a large-size planar heterogeneous model with a specific structure, and the preparation method comprises the steps of raw material preparation, pressure forming, temperature control curing, cementing sealing, pouring, curing demolding and the like. The prepared rock core is used for simulating oil displacement experiments including water flooding, chemical flooding and subsequent water flooding so as to observe the sweep effect and the plugging effect of a chemical additive in the rock core, the performance of the chemical additive is evaluated in combination with actual production requirements of an oil reservoir, and theoretical guidance is provided for field practice.

The invention provides an infilled well location determination method and device based on old well water ridge waves and a model. The infilled well location determination method comprises the steps that reservoir physical property parameters and fluid parameters of a production horizon of a target horizontal well and production dynamic data of the target horizontal well are obtained; obtaining a relative permeability curve and oil displacement efficiency through a rock core relative permeability experiment; the height of a water ridge during sidetrack drilling is calculated; the water ridge height, the reservoir physical property parameters, the fluid parameters and the production dynamic data are substituted into a horizontal well oil-water interface description formula, and the formula is nondimensionalized through normalization deformation; the corresponding relation between the dimensionless cumulative oil production and the dimensionless water ridge width and the dimensionless water ridge height is calculated through the oil displacement efficiency according to the water-oil displacement theory; establishing a data map comparison table of the dimensionless cumulative oil production, the dimensionless water ridge width and the dimensionless water ridge height, and judging the limit well spacing of the infilled well according to the data map comparison table; and according to the limit well spacing, carrying out encryption or branch reconstruction on the target horizontal well.

The invention provides a supercritical carbon dioxide core displacement experiment device and method, and the device comprises a supercritical carbon dioxide preparation system, a displacement reaction system, a temperature and pressure control system, a recovery metering system, and a data acquisition monitoring system. Flexible preparation of supercritical carbon dioxide can be achieved, the oil displacement process in the oil reservoir stratum environment can be accurately reduced, the experimental device is high in modification flexibility, and data collection, transmission and monitoring are efficient and high in precision. A series of experiment requirements of supercritical carbon dioxide preparation, injection oil displacement, data processing and the like can be conveniently met, the device can be conveniently subjected to experiment modification through the arrangement of the pipeline, the valve and the sensor, various experiment purposes are achieved, the utilization efficiency of the experiment device is improved, experiment operation is efficient, the carbon dioxide oil displacement and sealing experiment effects can be explored, and the experimental device is suitable for popularization and application. The method provides an experimental research thought for oil reservoir recovery efficiency, and has important guiding significance on improvement of oil and gas field recovery efficiency and development of a negative carbon technology.

The invention discloses a carbon dioxide pressure flooding oil displacement and burying numerical simulation technical system, and relates to the field of CCUS numerical simulation, and the technical system comprises a geological data obtaining module which obtains the geological data of a target oil field site; an oil reservoir geologic model construction module constructs an oil reservoir geologic model in the CO2 pressure drive process of the deep shale oil reservoir according to the geological data; the pressure-drive oil displacement and burying mathematical model building module is used for building a deep shale oil reservoir CO2 pressure-drive oil displacement and burying mathematical model on the basis of the multiphase multicomponent seepage model and the mechanical deformation model in combination with the reservoir damage mechanical constitutive model; and the pressure-drive oil displacement and burying numerical simulation module is used for solving the seepage equation and the mechanical equation, carrying out iterative coupling solution on the fluid-solid two fields based on a definite stress decomposition algorithm, carrying out deep shale oil reservoir CO2 pressure-drive oil displacement and burying numerical simulation, and can better simulate the porosity and permeability change and the evolution of a damaged area in the CO2 pressure-drive oil displacement and burying process.

The invention relates to a preparation method of a carbon quantum dot tracing oil displacement mixture, the carbon quantum dot tracing oil displacement mixture is prepared by using a self-made carbon quantum dot tracer, a hydrophobic surfactant and a skeleton monomer as synthetic raw materials through a hydrothermal method, the agent contains hydrophobic groups, interfacial tension between water and oil can be reduced, and the oil displacement efficiency is improved. Dispersion and migration of oil drops in water are promoted, so that fluid flow becomes easy; meanwhile, the agent further comprises carbon quantum dots which can indicate the flowing path of formation fluid and evaluate the oil displacement effect of the synthetic agent and the microfracture distribution condition of a target formation, relates to the technical field of quantum dot tracing and oil displacement, and provides a new thought, method and technology for improving the recovery efficiency by adopting the agent on an oil field site.

The invention discloses a method and a system for characterizing a miscible state after action of CO2 and crude oil based on interfacial tension, and relates to the technical field of oil reservoir CO2 flooding development, the method comprises the following steps: S1, obtaining a relation curve of oil displacement efficiency and displacement pressure through a numerical simulation tubule experiment, and determining the minimum miscible pressure; s2, obtaining a relation curve of interfacial tension and displacement pressure through a numerical simulation tubule experiment, and determining critical interfacial tension; s3, on the basis of the minimum miscible pressure and the critical interfacial tension, key parameters representing the miscible state are determined; and S4, carrying out engineering characterization on the miscible state after the CO2 and the crude oil act on the basis of the key parameters for characterizing the miscible state. According to the method, the miscible state is divided according to the interfacial tension, the miscible state in the CO2 flooding process is further refined, errors caused by the fact that the miscible state is judged due to the fact that the minimum miscible pressure changes along with mining time are reduced, and the miscible state in the CO2 flooding development process is represented more finely.

The invention relates to the technical field of oilfield chemistry, in particular to a glycosyl anionic surfactant and a preparation method and application thereof, and the glycosyl anionic surfactant is prepared from glucose, long-chain alkyl primary amine and succinic anhydride sodium hydroxide. The glycosyl anionic surfactant has excellent surface activity, is simple in preparation method, high in product yield, safe and reliable, can be used for oil displacement agents, polymer surface oil displacement agents, emulsifiers, discharge aiding agents, heavy oil viscosity reducers and the like, is wide in application, and meets the green development requirements of oil fields. The acid fracturing discharge aiding agent using the glycosyl anionic surfactant as a raw material can effectively reduce the surface and interfacial tension of an aqueous solution, and meets the technical specification of the acid fracturing discharge aiding agent.

The invention relates to the technical field of materials, in particular to preparation of an amphiphilic tungsten disulfide nano material and application of the amphiphilic tungsten disulfide nano material in preparation of an oil displacement agent. The oil-displacing agent prepared from the amphiphilic tungsten disulfide nano material can reduce the interfacial tension of an oil-water interface, and can be quickly adsorbed to the oil-water interface to layer oil and water; the surface wettability of the rock is changed, the lipophilicity of the rock is changed into weak hydrophilicity, and the pore throat cannot be blocked due to excessive hydrophilicity while the oil phase is stripped. The nano oil-displacing agent disclosed by the invention can still have an enough stable use effect after being frozen at a low temperature and then unfrozen.

The present invention belongs to the technical field of oil and gas exploration and development. Disclosed are a nuclear-magnetic-resonance-based method and system for characterizing the degree of miscibility of CO2 flooding. The method comprises: on the basis of a slim tube method, testing the minimum miscible pressure of crude oil of a target oil reservoir and CO2 (S101); on the basis of the minimum miscible pressure, conducting CO2 oil displacement experiments using cylindrical cores, collecting, in real time, two-dimensional weighted nuclear magnetic resonance images and multi-component T2 spectra of a fluid in the cores varying over time and space, synchronously collecting an outlet-end fluid, and conducting a chromatographic test to obtain chromatographic test data (S102); and on the basis of the two-dimensional weighted nuclear magnetic resonance images, the multi-component T2 spectra and the chromatographic test data, performing dynamically-changing qualitative and quantitative characterization on the degree of miscibility, so as to obtain qualitative and quantitative characterization results of the degree of miscibility of CO2 and the crude oil (S103).

The invention discloses a multi-site intelligent response type CO2 gas channeling prevention gel and a preparation method, and belongs to the field of chemical oil displacement, and the preparation method comprises the following steps: taking a carbon dioxide response type monomer, acrylamide and sodium acrylate as monomers, and adopting water-soluble free radical polymerization to prepare a CO2 response type copolymer; the CO2 response type copolymer, a cross-linking agent, a stabilizer, a retarder and formation water are prepared into a polymer cross-linking agent mixed solution, a cross-linking reaction is carried out under the conditions of formation temperature and mineralization degree, and the multi-site intelligent response type CO2 gas channeling prevention gel is obtained. The gel effectively solves the problems that a traditional anti-channeling agent is poor in injectivity in a low-permeability and ultra-low-permeability oil reservoir and cannot achieve deep channeling sealing, CO2 gas channeling fractured channels can be effectively blocked, the carbon dioxide oil displacement effect is remarkably improved, and key technical support is provided for large-scale application of carbon dioxide displacement.

The invention provides a three-phase foam flow injection simulation method for enhanced oil displacement of a high-water-content oil reservoir, and belongs to the field of computational fluid mechanics. An immiscible three-phase flow calculation model is constructed under a lattice Boltzmann framework, and a continuous surface force model and a re-coloring algorithm are introduced into the immiscible three-phase flow calculation model; repulsive force is added between gas-phase foams meeting requirements, so that the three-phase flow model has the capability of simulating non-coalescence foam behaviors; wetting boundary conditions are applied according to a diffusion interface idea, and solid wall surface boundaries with specific wettability under complex geometric conditions are processed; inputting three-phase fluid physical property parameters, providing auxiliary parameters necessary for executing simulation to operate the immiscible three-phase flow calculation model, and obtaining multiple groups of data representing the three-phase flow state in the foam injection oil displacement process through time-marching simulation. According to the invention, the blank of the lattice Boltzmann method in the aspect of simulating the three-phase foam flow of oil, water and gas is filled, and high-precision simulation can be carried out on the three-phase foam injection oil displacement process.

The invention discloses a multi-alkyl aromatic alcohol extended block copolymer or oxysalt thereof as well as a synthesis method and application thereof. Molecules of the product contain polyalkyl, aryl, polyoxypropyl / ethyl and various ionic hydrophilic group structures, the product has excellent temperature resistance and salt tolerance and stable chemical properties, the adsorption loss in sandstone is extremely small, any alkaline agent does not need to be added, the crude oil recovery rate can be increased by 40% or above only through a single component at the concentration of 0.3 wt%, and the oil recovery rate can be increased by 30% or above. And the influence of performance degradation of the composite oil-displacing agent in an oil reservoir due to a chromatographic separation effect is avoided.

The application provides a low-grade oil reservoir water injection development effect evaluation method, comprising the following steps: S1, collecting core scale limit oil displacement efficiency data; S2, collecting well pattern controlled reserve degree data; S3, calculating sweep efficiency of the low-grade water drive oil reservoir; S4, correcting the sweep efficiency according to the changes of reservoir physical property parameters caused by near-well pollution and reservoir energy decline; and S5, calculating the reference recovery rate and evaluating the development effect. The application can effectively avoid collecting and arranging a large number of cumbersome production dynamic data, fully utilize the flow characteristics and dynamic physical property parameter evolution of the low-grade oil reservoir, accurately evaluate the development effect of the low-grade oil reservoir, and be beneficial to efficient development of the low-grade oil reservoir.

The invention discloses a benzimidazolyl Gemini surfactant as well as preparation and application of the benzimidazolyl Gemini surfactant. The benzimidazolyl Gemini surfactant is a symmetric gemini type compound formed by a benzimidazole group, a styrene group, a sulfonate group and an alkyl chain with a proper length, and the compound has a better oil displacement effect. The surfactant can also reduce the surface tension of a solution in a dose-dependent manner, has relatively strong interfacial activity, excellent shear restorability and wettability, is beneficial to improving the oil recovery rate, and is suitable for multiple aspects such as an oil-soluble viscosity reducer, an oil-displacing agent and a microemulsion internal phase in tertiary oil recovery. The invention provides a method for preparing a surfactant by sulfonation and neutralization after styryl benzimidazole and alkyl diethylene oxide are subjected to ring-opening reaction to obtain a Gemini intermediate, and the synthetic process route has the characteristics of high product surface activity, excellent rheological property and simple synthetic method.

The preparation method comprises the following steps: weighing oleic acid and a catalyst, adding the weighed oleic acid and catalyst into a reaction container, heating by stages by adopting a programmable electric heating jacket, respectively dropwise adding a water carrying agent at 80-100 DEG C, dropwise adding diethylenetriamine or triethylene tetramine at 110-130 DEG C, controlling the reaction temperature and time, and reacting for 2-4 hours to obtain the compound corrosion inhibitor for the CO2 oil displacement produced liquid. After water is separated out, further reaction is carried out at 200-230 DEG C, then the system is cooled to 60-70 DEG C, a quaternization reagent is added for reaction, and a corrosion inhibitor E and a corrosion inhibitor S are prepared respectively; finally, the corrosion inhibitor E and the corrosion inhibitor S are compounded according to a certain proportion, and the compound corrosion inhibitor for the CO2 oil displacement produced liquid is obtained. The preparation method is simple and easy to implement, and the cost can be reduced; when the prepared corrosion inhibitor is applied to CO2 oil displacement produced liquid corrosion inhibition, an excellent corrosion inhibition effect can be shown, and corrosion hazards in CO2 oil displacement application are greatly reduced.

The invention belongs to the field of oil and gas exploitation, and particularly relates to a carbon dioxide-salt double-response polymer thickening agent and a preparation method thereof. The carbon dioxide-salt double-response polymer thickening agent provided by the invention is prepared from acrylamide, acrylic acid, alkyl polyether acrylate and amine carbon dioxide response monomers through solution polymerization; after corresponding monomers of amine carbon dioxide are protonated, polymer molecular chains are better stretched through electrostatic interaction, the viscosity of the fracturing fluid can be increased, complexation and crosslinking of oxyethyl, oxypropyl and calcium and magnesium ions are facilitated, and therefore the tackifying effect of alkyl polyether acrylate is improved; meanwhile, oxyethyl and oxypropyl jointly regulate and control the tightness degree of a network structure, so that a calcium and magnesium ion'salt bridge 'tackifying effect is presented. According to the carbon dioxide-salt double-response polymer thickening agent provided by the invention, the viscosity of the thickening agent is improved through carbon dioxide and calcium and magnesium ions, and meanwhile, a fracturing fluid has certain imbibition oil displacement capacity after gel breaking.

The invention relates to the technical field of microbial engineering, and particularly discloses a Gordonia sp. DH2, a biological oil displacement agent and application of the Gordonia sp. DH2, the Gordonia sp. DH2 is preserved in China Center for Type Culture Collection on June 3, 2024, the preservation number is CCTCC NO: M 20241126, and the Gordonia sp. DH2 is classified and named as Gordonia sp. DH2. The Gordonia provided by the invention can degrade saturated hydrocarbons and sulfur-containing compounds in crude oil, and the saturated hydrocarbons and the sulfur-containing compounds are used as a unique carbon source to generate a biological oil-displacing agent, degrade, disperse and emulsify the crude oil, so that the Gordonia can be used for improving the fluidity of the crude oil in a stratum and increasing the recovery rate of the crude oil.

The invention discloses a CCUS experimental device and method for carbon dioxide flooding and storage, and relates to the technical field of petroleum engineering. The device comprises a three-dimensional oil reservoir physical model, a fluid injection system, a fluid collecting and metering system, a resistivity monitoring system and a fluid migration observation system. The three-dimensional oil reservoir physical model is used for constructing a simulated stratum, and a development well pattern system is installed on the simulated stratum; the fluid injection system is connected with the injection well; the fluid collecting and metering system is connected with the production well; the resistivity monitoring system is provided with a plurality of monitoring points on the simulated stratum; the fluid migration observation system is used for observing a migration path of supercritical carbon dioxide in the three-dimensional oil reservoir physical model; and the distributed optical fiber monitoring system is arranged in the simulated stratum. According to the device and the method, oil reservoir water injection exploitation and CO2 injection oil displacement and CO2 storage stability simulation experiments in the later development period can be realized.

The invention discloses an oil reservoir grade carbon dioxide burying stock calculation method and system, and relates to the technical field of oil and gas field development, and the method comprises the steps: carrying out a core waterflooding-CO2 flooding pore scale fluid characterization experiment based on a micro-nano core CT online scanning technology, and calculating CO2 burying efficiency ES; measuring a core oil-gas phase permeability curve and oil displacement efficiency ED, and judging whether a semi-logarithmic relation curve of kro / krg and Sg in the CO2 displacement stage meets a binomial change relation or not; obtaining target oil reservoir static parameters and production dynamic indexes, describing a gas-oil ratio and cumulative oil production change relation in a gas seeing stage, establishing a CO2 flooding characteristic curve, and performing data point fitting, oil reservoir recovery rate ER prediction and oil reservoir swept volume V calculation through a binomial expression; and calculating the reservoir-level CO2 burying amount VS according to the reservoir swept volume V and the CO2 burying efficiency ES. According to the method disclosed by the invention, the required data are few in types and high in availability, and the CO2 burying amount can be accurately calculated simply, conveniently and quickly only by the basic physical properties of crude oil and rock and the production dynamic data of an oil well.

The invention relates to the field of oil exploitation, in particular to temperature-resistant and salt-resistant efficient gel as well as a preparation method and application thereof, which are used for solving the problems that the efficiency of the gel is influenced and the oil displacement effect is reduced due to poor high temperature resistance and salt resistance and easiness in failure of the existing polyacrylamide hydrogel. According to the preparation method, through a copolymerization technology, various monomers with excellent temperature resistance and salt resistance, such as acrylamide, methacryloyloxyethyl trimethyl ammonium chloride, 2-acrylamido-2-methylpropanesulfonic acid, a temperature-resistant monomer and a hydrophobic macromonomer, are integrated, so that the gel can bear a relatively high temperature without degradation or performance reduction; the prepared oil displacement gel has good stability in a high-salinity environment, does not lose an oil displacement effect due to the existence of salt, ensures the activity and stability of the gel in a high-temperature and high-salt-content oil reservoir environment, and obviously enhances the oil displacement efficiency of the gel in crude oil exploitation, thereby greatly improving the exploitation efficiency and recovery rate of crude oil.

The invention relates to an oil field auxiliary agent, and particularly discloses a temperature-resistant salt-resistant nano fluid oil displacement agent and preparation and application thereof, the temperature-resistant salt-resistant nano fluid oil displacement agent comprises the following components by weight: 5-12 parts of modified nano SiO2 particles, 10-20 parts of a nonionic surfactant, 10-30 parts of a gemini benzoxazine surfactant, 1-5 parts of a dispersant, 10-20 parts of a mutual solvent, and 20-50 parts of water; wherein the modified nano SiO2 particles are obtained by modifying nano SiO2 particles through a macromolecular coupling agent. The nano-fluid oil-displacing agent has the beneficial effects that the recovery efficiency can be improved when the nano-fluid oil-displacing agent is used for exploiting a high-temperature and high-salt oil reservoir, and the nano-fluid oil-displacing agent is good in temperature resistance and salt resistance, small in particle size and capable of remarkably reducing the oil-water interfacial tension.

The invention provides a method for analyzing the occurrence state of a rock core in the oil displacement process of an oil reservoir. The analysis method comprises the following steps: analyzing the occurrence state of the rock core in different oil displacement stages of the oil reservoir by utilizing Material Studio software and LAMMPS software; the rock core occurrence state comprises a combination of at least two of an oil phase occurrence state, a water phase occurrence state and a gas phase occurrence state in the rock core. According to the analysis method provided by the invention, the occurrence state of oil / gas / water in each stage in the CO2 oil displacement process can be clearly and intuitively displayed; change of reservoir conditions such as temperature, pressure intensity and a gap structure can be further explored, and the influence rule of environmental factors and pore type differences on the occurrence state of the core in the micro-nano-scale oil reservoir can be explored.

The invention discloses a CO2 non-point source leakage area diffusion simulation method, and aims to solve the problems that a CO2 oil displacement storage project has the characteristics of multiple well sites, large range and long operation time, and non-point source soil leakage and multi-point source shaft leakage coexist in each well site. According to the method, for large-range diffusion of leakage of multiple well sites, real-time point source leakage source parameters are provided for CFD simulation through flux monitoring and leakage rate calculation of each well site, and therefore real-time distribution of the mass fraction of atmospheric CO2 in a diffusion area, support safety and environmental risk assessment are obtained.

The invention belongs to the technical field of CO2 plume monitoring, and discloses a method and a system for monitoring sensitive attribute parameters through CO2 oil displacement time-lapse earthquake. The method comprises the following steps: selecting a sandstone reservoir with high porosity and high permeability as a target layer; performing rock physical modeling based on the selected sandstone reservoir, and enabling the rock physical modeling to be equivalent to a rock matrix, a rock skeleton, a pore filler and saturated rock; on the basis of the obtained rock physical modeling, CO2 of different concentrations is injected into the reservoir, and the corresponding speed and density value are calculated through the corrected Batzle-Wang formula; and calculating the AVO response by adopting a Shuey formula after calculating the corresponding speed and density values. According to the method, the influence of CO2 injection on the elastic property of the saturated reservoir rock under the in-situ condition is analyzed, and the accuracy of CO2 plume monitoring by using an earthquake method is improved.

The invention provides a graphene oxide composite oil-displacing agent and a preparation method and application thereof.The graphene oxide composite oil-displacing agent is prepared from poly (3-hydroxytyramine) and graphene oxide, the poly (3-hydroxytyramine) and the graphene oxide are combined through chemical bonds, the preparation method comprises the steps that hydrochloric acid 3-hydroxytyramine and the graphene oxide are subjected to a mixed reaction, and the graphene oxide composite oil-displacing agent is obtained. The obtained composite oil-displacing agent is applied to tertiary oil recovery. The composite oil displacement agent provided by the invention has excellent hydrophilicity, acid and alkali resistance and salt resistance, can form a stable water-in-oil emulsion with crude oil in a wide pH value range or under high salinity, and can improve the stability and viscosity of the emulsion; the emulsifying effect is strong, the emulsifying swept volume can be enlarged, and the application prospect in medium-low permeability oil reservoirs is wide; the preparation method provided by the invention is simple, convenient and high in practicability.