145 results about "Co2 flooding" patented technology

The invention discloses a carbon dioxide oil displacement burying multi-objective optimization method based on a self-adaptive agent model, and relates to the technical field of oil reservoir injection and production optimization. The method comprises the following steps: firstly, constructing a carbon dioxide flooding embedding injection-production optimization model, then acquiring a plurality of initial samples by adopting Latin hypercube sampling to construct a database, preferably selecting each target agent model based on the database, and then generating a Pareto leading edge by utilizing a dominating class search strategy, a decomposing class search strategy and an index class search strategy; and in the optimization stage, a preferred potential solution is searched according to a hypervolume improvement maximum strategy, numerical simulation is carried out, the database is updated until a preset number of times is reached, each iteration optimization scheme, an oil reservoir net present value and a carbon dioxide burying amount are output, and multi-target optimization of carbon dioxide flooding burying is completed. According to the method, the carbon dioxide flooding multi-objective optimization efficiency is improved, meanwhile, the search direction is dynamically adjusted through the hyper-volume evaluation index, the Pareto frontier is accelerated, and accurate prediction of the carbon dioxide flooding development scheme is achieved.

The invention discloses a CO2-oil near-miscible phase pressure acquisition system and method based on convective mixing, and belongs to the field of CO2 oil displacement. The system comprises a high-temperature and high-pressure reaction kettle, a temperature and pressure control system, a gas injection module, a liquid injection module and a monitoring control module. According to the method, the oil phase and the carbon dioxide are induced to form a convective mixing effect by dynamically regulating and controlling the injection flow rate, and when no interface of the system reaches a mutual convective mass transfer state, the system pressure corresponding to a phase interface disappearance critical point is directly recorded as a near-miscible-phase pressure value. The near-miscible pressure value obtained by the method is high in accuracy, the single test time is shortened to 1 hour, the test period is remarkably shortened, near-miscible pressure parameters under different temperature conditions can be measured in a short time, the CO2-oil near-miscible pressure can be measured by simulating a high-temperature and high-pressure environment of a stratum, and the method is suitable for popularization and application. And high-timeliness key phase state data support is provided for unconventional oil and gas reservoir development.

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 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 a peracetylated polysaccharide derivative mixing accelerator as well as a preparation method and application thereof, and relates to the technical field of polysaccharide derivatives. Alkyl polyglucoside and glycidyl ether are subjected to etherification reaction to obtain polysaccharide derivatives; and adding acetic anhydride and an organic weak base catalyst into the polysaccharide derivative, and carrying out esterification reaction to obtain the peracetylated polysaccharide derivative. The obtained peracetylated polysaccharide derivative can be used for reducing the minimum miscible pressure of CO2 in an offshore oilfield. The polysaccharide derivative provided by the invention is simple in synthesis process, and the molecular activity of the polysaccharide derivative can be regulated and controlled by changing the number of carbon dioxide-philic groups and the length of oleophylic unsaturated hydrocarbon chains, so that the polysaccharide derivative can be used in the CO2 oil displacement process of oilfield exploitation, and the minimum miscible pressure in the CO2 oil displacement process is effectively reduced.

According to the carbon dioxide oil displacement tank capable of automatically adjusting the pressure, during daily storage, the change speed and amplitude of the pressure in the tank are maximum, so that the stability of equipment can be influenced, an air bag is arranged in a third air cavity, and when the pressure in the third air cavity changes, the air bag is closed, so that the stability of the equipment is improved. The air bag can be matched with the third electric valve and the second electric valve to release or suck air so as to adjust pressure change, the speed and amplitude of the pressure change are slowed down to be within a controllable range, and therefore the stability of air stored in the device is improved, the interior of the tank body is divided into three storage units, and the storage effect is good. The third air cavity, the second air cavity and the first air cavity are sequentially arranged from inside to outside, when the first air cavity leaks, the third air cavity and the second air cavity are in a closed state and do not leak with the first air cavity at the same time, the capacity of the first air cavity is the minimum, the capacity of the third air cavity is the maximum, and if the first air cavity leaks, the loss can be reduced to the minimum. Therefore, the safety of the device can be improved.

The invention discloses a high-pressure CO2 oil displacement micro-fluidic chip device which comprises an upper polar plate, a middle partition plate, a lower polar plate, a speed measurement module, a porous medium radial flow module and a liquid outlet module, the speed measurement module is arranged on the upper surface of the middle partition plate; the porous medium radial flow module and the liquid outlet module are arranged on the upper surface of the lower polar plate; the upper polar plate, the middle partition plate and the lower polar plate are sequentially stacked from top to bottom; the speed measurement module is connected with the porous medium radial flow module; and the porous medium radial flow module is connected with the liquid outlet module. According to the device disclosed by the invention, a pore throat structure in rock is simulated by constructing a micron-sized or even smaller complex flow channel, and the CO2 flooding crude oil flow characteristic and the CO2 distribution rule are simulated; a transparent visualization device structure is designed, and visualization of the action mechanism of the CO2 oil displacement system and the reservoir fluid distribution characteristics is guaranteed.

The invention discloses a CO2 well flooding oil casing pressure intelligent control and anti-freezing and anti-blocking system, and relates to the technical field of oil and gas field development engineering.The CO2 well flooding oil casing pressure intelligent control and anti-freezing and anti-blocking system comprises the steps that a controller starts a self-checking program, loads a preset target pressure value, a preset temperature early warning threshold value and a preset ice blocking critical temperature parameter, completes initial configuration, and sends the initial configuration to the controller; zero calibration and precision verification are carried out on the front-end pressure sensor, the rear-end pressure sensor and the temperature sensor, front-end pressure data, rear-end pressure data and temperature data are collected, data filtering and abnormal value removing processing are carried out, and the real-time temperature data and CO2 physical property parameters are obtained. According to the invention, hardware self-inspection and sensor precision calibration are realized through the controller initialization module, the data acquisition module completes multi-source data synchronous acquisition and filtering processing, and the dynamic risk assessment module based on an improved Span-Wagner equation and a fuzzy logic algorithm can accurately calculate a CO2 phase change critical point and output a quantitative risk index. The problems of energy waste and untimely freezing and blocking prevention caused by a traditional fixed threshold value method are solved.

The invention belongs to the technical field of oil field gas channeling plugging agents, and discloses a high-molecular pre-crosslinked gel particle plugging agent suitable for a carbon dioxide drive oil reservoir and a preparation method of the high-molecular pre-crosslinked gel particle plugging agent. The raw materials comprise an acrylamide monomer, sodium bentonite, an acrylic monomer, an acid-resistant functional monomer, a temperature-resistant and salt-resistant functional monomer, a first cross-linking agent, a second cross-linking agent, an initiator, an inorganic reinforcing agent, an antioxidant and water. The prepared acid-resistant gel particle is good in temperature resistance, salt resistance and acid resistance and long in effective period of action, the viscosity of a system is increased after the particle swells for a certain time, the plugging capacity is enhanced, and the acid-resistant gel particle can be used as an excellent CO2 drive reservoir gas channeling plugging agent and is used for plugging a heterogeneous formation with developed micro-cracks.

A low-permeability reservoir flooding and burying collaborative optimization method based on a swarm intelligence algorithm is characterized in that a mathematical model (optimization variables, constraint conditions and objective functions) under carbon dioxide flooding and storage collaborative optimization and construction of related solving methods are defined on the basis of an optimization theory, and the swarm intelligence algorithm is combined, so that the reservoir flooding and burying collaborative optimization of the low-permeability reservoir is realized. And establishing a carbon dioxide flooding and storage collaborative optimization theoretical system, and performing instance application analysis. According to the CO2 oil displacement and storage collaborative optimization method for the low-permeability reservoir, the swarm intelligence algorithm and the numerical simulation technology are coupled, and a theoretical basis and a technical support are provided for actual CO2 oil displacement and storage projects.

The invention relates to the technical field of petroleum and natural gas engineering, and discloses an optimization method for carbon dioxide flooding and sealing collaborative heat collection. On the basis of the target oil reservoir area, parameter variables used for optimizing carbon dioxide oil displacement and sealing collaborative heat recovery are determined; inputting the parameter variables and the target oil reservoir area into a pre-constructed classification-assisted hierarchical learning pre-screening model and a differential evolution algorithm agent model, and determining the cumulative oil production, the cumulative heat production and the carbon dioxide sequestration amount; based on the cumulative oil production, the cumulative heat production and the carbon dioxide storage amount, determining a to-be-optimized target function; and the parameter variables are optimized, and the maximum net present value of the target function is selected as the optimal scheme of carbon dioxide flooding and storage collaborative heat collection. According to the invention, the calculation speed and precision of the optimal scheme and the accuracy of the calculation result can be provided.

The application provides a kind of low permeability long fracture fracturing well group CO2 drive critical injection parameter evaluation method, comprising: carrying out CO2 injection well group reservoir characteristics fine description;Carrying out CO2 injection well group geomechanics parameter description;Establish low permeability long fracture fracturing well group CO2 drive reservoir matrix-fracture coupling numerical simulation model;Carrying out long fracture fracturing well group CO2 drive numerical simulation, evaluating reservoir pressure change;Carrying out long fracture fracturing well group CO2 drive disturbance stress field change evaluation;Carrying out long fracture fracturing well group CO2 drive fracture propagation determination, evaluating gas channeling and CO2 leakage risk, determining critical injection parameter limit.The low permeability long fracture fracturing well group CO2 drive critical injection parameter evaluation method combines the dynamic change evaluation CO2 drive critical injection parameter of low permeability long fracture fracturing well characteristics and reservoir physical parameter, and has important significance for improving CO2 drive development effect and realizing CO2 drive reservoir scientific management.

This application relates to a physical simulation device and method for determining the location of a CO2 flooding front, belonging to the field of physical simulation devices. The device includes a clamp, an imaging device sleeved on the outside of the clamp, an intermediate container filled with CO2 at the inlet end of the clamp, a back pressure assembly at the outlet end of the clamp, a metering assembly between the back pressure assembly and the clamp, and a confining pressure assembly on the clamp. This application has the effect of determining the location of a CO2 flooding front by analyzing changes in oil phase signals in core samples.

The invention discloses a low-permeability reservoir CO2 oil displacement storage synergistic interaction regulation and control device, which belongs to the technical field of low-permeability reservoir development and carbon storage, and comprises a CO2 source supply unit, an intelligent injection allocation regulation and control unit, a reservoir injection unit, an oil displacement monitoring unit and a storage synergistic unit which are communicated in sequence, all the units are networked through pipelines and are internally provided with data interaction modules to realize information closed-loop transmission, and the intelligent injection allocation regulation and control unit is a core control end; according to the low-permeability reservoir CO2 oil displacement and storage synergistic interaction regulation and control device, a supply, regulation and control, injection, monitoring and storage integrated closed-loop system is constructed, an intelligent injection allocation regulation and control unit serves as a core, the multi-element coupling relation of oil displacement efficiency, storage capacity and injection parameters is established through a synergistic interaction algorithm model, and according to the real-time dynamic state of an oil reservoir, the oil displacement efficiency, the storage capacity and the injection parameters can be adjusted and controlled according to the real-time dynamic state of the oil reservoir. And the operating parameters of each unit are dynamically adjusted, so that the optimal balance between the CO2 oil displacement efficiency and the storage capacity is realized, and the crude oil recovery rate of the low-permeability reservoir is improved.

The application relates to a multi-stage electric heating intelligent unblocking device and method for complex frozen blockage of a CO2 flooding waxy crude oil gathering pipeline, wherein the multi-stage electric heating intelligent unblocking device for complex frozen blockage of the CO2 flooding waxy crude oil gathering pipeline comprises a dredging system, an outer framework and an intelligent control system; the outer framework is a bionic flexible guide pipe which is composed of multiple body segment units connected through expansion joints; the dredging system integrates a first-stage global heating system, a second-stage local heating system and a dosing system; a flexible electric heating pipe is embedded in the bionic flexible guide pipe to form a uniform heating body; the bionic flexible guide pipe is provided with a temperature sensor; the second-stage local heating system is an intelligent composite drill bit which can autonomously heat; the intelligent composite drill bit comprises a motor system, a drill bit shell, an electric heating rod, a drill bit and a miniature night vision camera; the dosing system comprises an inhibitor storage tank and multiple nozzles. The application can quickly break the frozen blockage area and realize intelligent operation.

The application provides a CO2 oil displacement storage regulation optimization decision method and system, the method obtains a three-dimensional geological model, production dynamic data and monitoring data of a target working area; a component numerical simulation technology is used to fit a CO2 injection production dynamic history of the target working area, so that target operation parameters of a simulation operation model are adjusted and determined to obtain a matched production simulation operation model; a gas-oil ratio is determined according to the production dynamic data, and then a gas channeling index is calculated, and a target well group meeting the conditions of the gas channeling index is selected; a relationship curve distribution between a Peclet number, an oil increment and a component sweep efficiency is determined by simulating different injection speeds to determine an optimized target injection speed; and development parameters corresponding to different injection modes are simulated, and the target injection mode is determined in combination with the gas channeling index, the sweep efficiency and the miscibility degree. The scheme can overcome the defects of the prior art that the parameter optimization is not in place and the precision is insufficient, and can consider the particularity of the CO2 oil displacement mechanism to establish a regulation optimization strategy based on dimensionless parameters.

The invention discloses an emulsified particle channeling sealing agent for CO2 flooding as well as a preparation method and application thereof, and belongs to the technical field of CO2 flooding of oil reservoirs. The emulsified particle channeling sealing agent for CO2 flooding comprises the following components in percentage by weight: 20-30% of matrix asphalt, 1.6-2% of latex, 0.8-1.2% of a softening agent, 3-5% of an emulsifier, 0.1-0.5% of a dispersing agent, 0.4-1.3% of a pH regulator and the balance of deionized water. The emulsified particle channeling blocking agent for CO2 flooding can effectively block deep cracks or large pore channels of a reservoir, enlarge the sweep efficiency of CO2 in an oil reservoir and improve the CO2 flooding recovery efficiency, has excellent temperature resistance, acid resistance and salt resistance, and is harmless to a reservoir matrix.

The invention relates to the technical field of carbon dioxide oil displacement, in particular to a carbon dioxide oil displacement and gas displacement sealing device for a coal-oil-gas symbiotic area. The gas injection assembly is arranged above the base; the storage tank is fixedly arranged at the top of the base, and the gas inlet end of the gas injection assembly communicates with the interior of the storage tank; the conveying pipe is arranged above the base, and the gas outlet end of the gas injection assembly communicates with the interior of the conveying pipe; and the position adjusting assembly is arranged above the base, and the output end of the position adjusting assembly is connected with the conveying pipe. When the device is used, the device is moved to a designated place through the base, the gas injection assembly can pump carbon dioxide in the storage tank into the conveying pipe, the conveying pipe discharges the carbon dioxide into the ground, and oil type gas, methane and coal bed gas can be pumped to the ground. The position adjusting assembly can drive the conveying pipe to move in the vertical direction, the position of the conveying pipe in the vertical direction can be freely changed, the conveying pipe automatically moves upwards again, and carbon dioxide is discharged at a specific accurate position.

The application belongs to the technical field of oil exploitation, and discloses a high-temperature and high-pressure full-automatic CO2 flooding and burying integrated experimental device and method, which comprises a core clamping system for clamping a core sample, and a pressure measuring system and a confining pressure system are communicated on the core clamping system; a fluid injection system is communicated with the core clamping system; a fluid property measuring system for measuring fluid properties is arranged on the fluid injection system; an output product separation system is communicated with the outlet of the core clamping system through a back pressure adjusting system, and the output product separation system is communicated with a fluid recovery system, a fluid analysis system and a fluid circulation system; and an output product measuring system is communicated with the core clamping system. The application realizes automatic control of the whole set of equipment, is suitable for evaluation of carbon dioxide enhanced oil recovery and in-situ storage, and can also be used for experimental research on related problems such as natural energy depletion development, secondary and tertiary oil recovery, expands the research field and enlarges the application range.

The invention discloses a wellhead throttling anti-freezing and anti-blocking device and method for a carbon dioxide flooding well, and relates to the technical field of carbon dioxide flooding wells. Wherein the oil nozzle comprises a first-stage oil nozzle and a second-stage oil nozzle arranged at the upper part in the heating box which are connected; the inlet end of the primary oil nozzle is connected with an outlet oil nozzle sleeve of the Christmas tree; the outlet end of the primary oil nozzle is connected with the inlet end of the secondary oil nozzle; the outlet end of the secondary oil nozzle is connected with the inlet end of the coil in the heating box; the outlet end of the coil penetrates out of the heating box and is connected with a gathering pipe communicated with the lower side of an oil outlet pipe of the Christmas tree. The method is a production management method which can adapt to the production change rule of the carbon dioxide flooding well on the premise that the conventional carbon dioxide flooding well mouth process and the electric power facility design are not rebuilt and expanded, and is economical.

The invention discloses a microscale shale pore CO2 oil displacement simulation method based on computational fluid dynamics (CFD). The microscale shale pore CO2 oil displacement simulation method is suitable for low-permeability and low-porosity oil reservoir development. According to the method, a porous medium numerical model is constructed, CO2-crude oil two-phase flow characteristics under different pore structures and stratum conditions are systematically researched, and a pore scale fluid distribution rule and displacement efficiency are mainly analyzed. The CFD numerical simulation technology is adopted, key parameters such as the CO2 diffusion and migration rule in the pores and residual oil saturation distribution are obtained, and the CO2 oil displacement mechanism in the micro-nano-scale pores is revealed. By comparing displacement effects under different environmental parameters (pressure, temperature and the like) and pore configurations (pore size distribution, connectivity and the like), a quantitative relation model of pore structure-oil displacement efficiency is established. The method provides theoretical basis and technical support for optimization of a low-permeability reservoir CO2 oil displacement scheme, and has important guiding significance for improving the unconventional oil and gas recovery ratio and CO2 geological sequestration.

The utility model discloses a shale oil carbon dioxide displacement simulation experiment device, which is applied to the field of oil reservoir development, and is characterized in that a triangular groove is moved by moving a sliding cylinder, the triangular groove moves to enable a clamping rod to be separated from a clamping groove under the action of a second spring, and an air inlet pipe is taken out; then the mounting head on a new carbon dioxide gas tank is connected with the gas inlet pipe, the sliding cylinder is loosened to reset the triangular groove, and the clamping rod is clamped with the clamping groove to fix the clamping groove, so that the purpose of conveniently replacing the carbon dioxide gas tank is achieved, the workload is reduced, and the replacement efficiency is improved; a rotating head is rotated to enable a transmission shaft to drive a second bevel gear to rotate, the second bevel gear rotates to enable a first bevel gear to drive a screw rod to rotate, the screw rod rotates to drive a baffle to move, the baffle and a limiting ring are pressed tightly, and the pipe opening of the output pipe is blocked, so that the purpose of an anti-dripping function is achieved, cleanliness of the electronic balance is guaranteed, and practicability is improved.

The invention provides a non-dehydration mixed absorption supercharger for a carbon dioxide oil displacement process, and belongs to the technical field of superchargers. Comprising an oil cylinder barrel, a left oil-gas cylinder connecting end cover, a left air cylinder, a right oil-gas cylinder connecting end cover, a right air cylinder, an oil cylinder piston, a left piston rod, a right piston rod, a left air cylinder end cover, a right air cylinder end cover, a left air cylinder piston and a right air cylinder piston. The left end of the oil cylinder barrel is connected with a left cylinder through a left oil-gas cylinder connecting end cover; the right end of the oil cylinder barrel is connected with a right air cylinder through a right oil gas cylinder connecting end cover, a short plummer block is arranged at the right end of a left piston rod, and the right end of the left piston rod is coaxially connected with the left inner end of an oil cylinder piston. The problems of piston lubrication, decomposition and reduction of supporting constraint points are solved, eccentric wear is reduced, the wear of the piston rod is reduced, the air inlet valve and the air outlet valve are arranged inside, the axial perpendicularity of the valve element and the valve seat is ensured, and the eccentric wear is reduced.

The invention discloses a direct reinjection device for CO2 flooding produced gas, which is characterized in that an electric block valve, an electromagnetic heater, a gas-liquid separator, a molecular sieve dehydration pry, supercritical compression equipment and a reinjection unit are sequentially arranged along a flow node of the CO2 flooding produced gas, and an outlet of the reinjection unit is connected into a specified well; one bottom outlet of the gas-liquid separator is connected into the gathering and transporting system, the other bottom outlet of the gas-liquid separator is connected into the closed sewage tank, and the bottom outlets of the molecular sieve dehydration pry are connected into the closed sewage tank. The invention further discloses a direct reinjection method for CO2 flooding produced gas. The invention belongs to the technical field of carbon capture, burying and utilization, and solves the problems in the prior art that in the CO2 flooding extraction process, CO2 flooding extraction gas is high in CO2 content, the pressure in the open flow stage is high, and the extraction gas is difficult to enter a gas collection system. And the problems that in the prior art, CO2 drive produced gas is large in flow, high in CO2 content, large in fluctuation range and high in treatment cost are solved.

The invention provides a carbon dioxide wettability adjusting composition as well as a preparation method and application thereof. Based on 1 part by weight of modified siloxane, the carbon dioxide wettability adjusting composition also comprises the following components: 0.1-10 parts by weight of alkylbenzene sulfonate; 1-100 parts by weight of a solvent; the structural formula of the modified siloxane is shown as a formula (I), wherein R1 is C1-C8 alkyl; r2 is H or alkyl of C1-C4; r3 is H or alkyl of C1 to C20; m is an integer of 1-10; and n represents an integer of 0-10. The technical problems that after long-term CO2 flooding, stratum asphaltene precipitates, wettability is changed into oil wetting, and follow-up thick oil is difficult to extract are solved.

The present application relates to a kind of CO2 injection dynamic optimization method based on deep reinforcement learning and MRST reservoir numerical simulation coupling, belong to petroleum engineering intelligent optimization control technical field, to solve the serious dependence of artificial trial calculation in existing CO2 injection system optimization, dynamic decision-making ability is insufficient, physical simulation and intelligent decision-making are disjointed and safety constraint processing is insufficient and other problems.Through MRST, CO2 injection numerical simulation environment is established, state variables such as pressure field, CO2 saturation field, well control state, cumulative injection amount, storage amount index and constraint margin are constructed from simulation state, injection control action is output by deep reinforcement learning agent, MRST simulation is promoted after engineering constraint processing, reward is calculated and strategy is updated.The present application can be adjusted according to reservoir dynamic response Rolling injection strategy, applicable to CO2 geological storage and CO2 flooding and storage collaborative optimization scene.

The invention relates to the technical field of petroleum and natural gas engineering, in particular to an ester group-containing polypyridine quaternary ammonium salt corrosion and scale inhibitor and a preparation method thereof. The molecular formula of the ester-containing polypyridine quaternary ammonium salt corrosion and scale inhibitor is C45H44Br3N3O7, a polypyridine quaternary ammonium salt structure can form a multi-layer compact adsorption film on the metal surface through electrostatic adsorption and coordination, and introduced pyridine rings, ester groups and hydroxyl groups have a synergistic effect in the scale inhibition aspect. The corrosion inhibition rate of the ester-containing polypyridine quaternary ammonium salt corrosion and scale inhibitor can reach up to 98.87% in a saturated CO2 and 3.5% NaCl solution under the condition that the injection concentration is 200ppm; and the scale inhibition rate reaches up to 93.79% under the condition that the filling concentration is 60ppm. The ester group-containing polypyridine quaternary ammonium salt corrosion and scale inhibitor has corrosion and scale inhibition functions at the same time, and is especially suitable for an oil field in a CO2 drive oil extraction scene.

The present invention discloses a multi-objective optimization method for carbon dioxide flooding and oil storage based on an adaptive proxy model, which relates to the technical field of reservoir injection and production optimization. The present invention first constructs a carbon dioxide flooding and oil storage injection and production optimization model, then uses Latin hypercube sampling to obtain multiple initial samples to construct a database, and after optimizing each target proxy model based on the database, uses a dominating search strategy, a decomposition search strategy, and an indicator search strategy to generate a Pareto frontier. In the optimization stage, the optimal potential solution is searched and numerical simulation is performed based on the strategy with the largest hypervolume improvement. The database is updated until a preset number of times is reached, and each iterative optimization plan, the net present value of the reservoir, and the carbon dioxide storage volume are output to complete the multi-objective optimization of carbon dioxide flooding and oil storage. While improving the efficiency of carbon dioxide flooding multi-objective optimization, the method of the present invention uses hypervolume evaluation indicators to dynamically adjust the search direction to accelerate the advancement of the Pareto frontier, thereby achieving accurate prediction of carbon dioxide flooding development plans.

The invention discloses a CO2 flooding minimum miscible pressure prediction method, system and equipment for in-situ crude oil and a storage medium, and the method comprises the steps: S1, obtaining multiple pieces of CO2 flooding minimum miscible pressure data of in-situ crude oil with high intermediate component content, and carrying out the data preprocessing to remove extreme values; s2, establishing a multivariate linear regression model for predicting the minimum miscible pressure based on the preprocessed data, and removing the collinearity of the multivariate linear regression model through ridge regression to obtain a minimum miscible pressure prediction formula; and S3, predicting the minimum miscible pressure of the in-situ crude oil by adopting a minimum miscible pressure prediction formula. The method is suitable for CO2-driven formation crude oil of formation crude oil with high intermediate component content, and can accurately predict the minimum miscible pressure value.