120 results about "Carbon dioxide 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 shale oil carbon dioxide flooding surfactant and a preparation method thereof, and belongs to the technical field of surfactants. The rock oil carbon dioxide flooding surfactant is prepared from the following components in parts by weight: 100 parts of water, 40 to 60 parts of fluorine-containing copolymer, 15 to 25 parts of sodium dodecyl benzene sulfonate, 10 to 20 parts of polyoxyethylene ether surfactant containing siloxy and 5 to 10 parts of nanoparticles. The fluorine-containing copolymer, the sodium dodecyl benzene sulfonate, the siloxy-containing polyoxyethylene ether surfactant and the nanoparticles are compounded, so that on one hand, the surfactant has relatively high salt tolerance and temperature tolerance so as to adapt to the environment of a shale oil reservoir; on the other hand, the surface activity is synergistically improved, the interfacial tension is reduced, the rock surface wettability is changed, and the system stability is enhanced, so that higher recovery efficiency is realized.

The invention relates to the field of coal seam anti-reflection, and particularly discloses a coal seam carbon dioxide and static expanding agent synergistic anti-reflection system and method. Slurry prepared by mixing a static expanding agent and water is injected into the expansion fracturing drill hole, in the process that the static expanding agent is subjected to hydration reaction and generates expansion stress, carbon dioxide gas is injected into the expansion fracturing drill hole through the carbon dioxide gas injection pipe, carbon dioxide and the hydration product of the static expanding agent are subjected to carbonization reaction to generate larger expansion stress, and the expansion fracturing drill hole is formed. Expanding the coal body fractures to form expansion fractures; the carbon dioxide is driven by differential pressure to seep into a coal matrix along expansion fractures, and adsorbed gas is driven to be desorbed into a free state through a competitive adsorption effect; and under the combined action of extraction negative pressure and carbon dioxide displacement, the free-state gas moves from the fracture channel to the extraction drill hole, and extraction is conducted through the gas extraction system. Carbon dioxide and the static expanding agent cooperate to improve permeability of the coal body, the displacement effect of carbon dioxide on gas is promoted, and the gas extraction effect is improved.

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 belongs to the field of single-well gas injection, and discloses a low-permeability tight oil reservoir single-well CO2 gas injection and displacement speed determination method and a related device. The method comprises the following steps: constructing a carbon dioxide gas flooding and injection velocity model containing matrix overburden pressure permeability and starting pressure gradient; the method comprises the following steps: testing the permeability of a reservoir core sample of a tight sandstone reservoir under different effective stresses to obtain a first relation curve, and carrying out regression analysis to obtain a first coefficient corresponding to the matrix overburden pressure permeability; respectively carrying out starting pressure gradient testing on the core samples with different matrix overburden pressure permeability to obtain a second relation curve, and carrying out regression analysis to obtain a second coefficient corresponding to the starting pressure gradient; and the collected basic data, the first coefficient and the second coefficient are input into the carbon dioxide flooding gas injection speed model for calculation, and the gas injection speed of the single well is obtained. According to the method, the carbon dioxide flooding and gas injection speed can be better optimized, and therefore the exploitation efficiency of an oil field is improved.

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 relates to the technical field of coal mine gas extraction technologies and equipment, in particular to intelligent plugging-displacement yield increasing-redundancy protection integrated equipment and method for a gas extraction drill hole. The equipment comprises a carbon dioxide displacement system, a grouting system, a gas extraction system and an intelligent control system, according to the intelligent plugging device, intelligent plugging can be conducted on the gas extraction drill hole, the sealing performance of the drill hole is guaranteed to the maximum extent, adsorption-state gas in each layer can be displaced, the gas extraction amount is increased, the gas outburst danger is reduced, redundant protection such as an emergency sealing device is additionally arranged, and the safety of extraction equipment is improved. The manual intervention cost is greatly reduced, the sealing effect of drill hole plugging is improved, compared with common drill hole plugging, the gas yield is increased, and the safety of gas extraction operation is improved.

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.

The invention belongs to the technical field of carbon dioxide storage and utilization, and particularly relates to a stainless steel oil casing for carbon dioxide flooding enhanced oil extraction and a manufacturing method thereof. The stainless steel oil casing comprises the following chemical components in percentage by weight: less than or equal to 0.03% of C, 0.15%-0.3% of Si, less than or equal to 0.010% of P, less than or equal to 0.005% of S, 14.0%-18.0% of Cr, 0.5%-2% of Mn, 2.0%-3% of Ni, 1.0%-3.0% of Mo, 0.20%-0.30% of N, 0.5%-1.0% of Cu, 0.025%-0.1% of Nb, 0.015%-0.025% of V, 0.001%-0.003% of Ca, 0.01%-0.03% of Re and the balance of Fe and inevitable impurities. The yield strength of the stainless steel oil casing ranges from 758 MPa to 931 MPa, the tensile strength is larger than 862 MPa, the ductility is larger than or equal to 30%, the stainless steel oil casing has good obdurability matching and excellent corrosion resistance and low-temperature impact toughness, the applicable service temperature range is-50 DEG C to 180 DEG C, the stainless steel oil casing can be applied to the low-temperature environment caused by injection-production yield increase after carbon dioxide capture, and the service life of the stainless steel oil casing is prolonged. And two or three of carbon dioxide, hydrogen sulfide and chloride ions coexist in the corrosive medium working condition.

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 invention discloses a device and method for evaluating the sealing performance of a shaft under the geological storage in-situ condition of carbon dioxide, and the device comprises a corrosion shaft test module, a carbon dioxide displacement module, a gas channeling simulation module, a shaft temperature and pressure control module and a stratum temperature and pressure control module. The shaft assembly is arranged in the testing shell in a penetrating mode, closed cavities are formed between the top end of the shaft assembly and the top end of the testing shell and between the bottom end of the shaft assembly and the bottom end of the testing shell, and a gas flow meter is installed at the top end of the testing shell. And a confining pressure bin and a heating bin are sequentially arranged in the test shell in the radial direction away from the shaft assembly. The device can simulate the lithology-temperature-pressure-carbonic acid environment in the geological storage process of carbon dioxide, and the sealing capacity of a shaft under the in-situ service condition is evaluated; therefore, the purposes of optimizing the formula of the cement paste, optimizing the material of the sleeve and reducing the risk of carbon dioxide leakage are achieved.

The invention belongs to the technical field of residual coal re-mining, and particularly relates to a gas and fire treatment method in the tunneling process of a lower-layer residual coal re-mining roadway, which comprises the following steps of: injecting gel foam into an upper-layer mining stopping line and an upper-layer open-off cut for leaking stoppage and cooling; advanced extraction is conducted on gas accumulated in a gas guide fissure zone of an overlying coal rock stratum of the upper-layer old goaf, meanwhile, carbon dioxide is injected into an air inlet and return roadway area of the upper-layer old goaf through a carbon dioxide injection drill hole in the ground, gas is displaced, and negative pressure air leakage of the upper-layer old goaf is prevented; and judging whether the residual coal in the upper-layer old goaf is spontaneously combusted or not, if the residual coal in the upper-layer old goaf is spontaneously combusted, increasing the carbon dioxide injection amount and the diffusion area, and performing advanced detection on the cavity in the process of tunneling the lower-layer roadway. According to the method, the risk probability of gas overrun, coal spontaneous combustion or gas explosion in the tunneling process of the lower-layer residual coal re-mining roadway is reduced.

The application provides a method for realizing pressure head migration by using a front carbon dioxide slug to assist water injection, comprising the following steps: step 1, establishing a model of water injection assisted by a front carbon dioxide slug; step 2, calculating the required water injection volume for water injection according to a production scheme and reservoir production data, and combining a pressure distribution model to optimize the volume of the required carbon dioxide slug; step 3, injecting the carbon dioxide slug according to the calculation result of step 2 to realize pressure head migration; and step 4, after the carbon dioxide slug is injected, water injection development is carried out in the way of water injection to form a development model of water and carbon dioxide slug oil displacement. The method for realizing pressure head migration by using a front carbon dioxide slug to assist water injection combines the advantages of water injection and carbon dioxide displacement, achieves good oil displacement effect at a low cost, and has a great application prospect in the development of low-permeability reservoirs, tight reservoirs and fault block reservoirs.

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 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 present invention provides a downhole carbon dioxide flooding and same-well intelligent injection and production method based on wave code communication. First, a surface wave code communication controller uses wave code communication to adjust the gas nozzle to a gas injection mode, and gas injection is allocated to each layer in the downhole. After the gas injection time ends, the gas nozzle is adjusted to a well blocking mode, and each layer in the downhole is blocked for a preset time. Finally, after the well blocking time ends, the gas nozzle is adjusted to an oil production mode, and oil production begins in each layer in the downhole. Because the method of the present invention supports adjusting the gas nozzle operating mode and preset time through wave code, it can be used in a long-term cycle, solving the problem of supporting stratified gas injection and stratified oil production in a single well, improving oil production efficiency, and reducing production costs.

The present invention relates to the technical field of wellbore risk assessment, and in particular to a method for quantitatively assessing the wellbore integrity risk of a carbon dioxide injection well, comprising: constructing a hierarchical model for injection well integrity assessment; determining the weight coefficient of each risk indicator; evaluating each risk indicator separately; calculating the total risk level score and determining the risk level. The present invention can comprehensively consider a variety of risk factors and achieve a detailed assessment of wellbore integrity through the determination of a hierarchical model and weight coefficients. The acquisition of real-time data and parameter correction ensure the accuracy and timeliness of the evaluation results. In addition, the method can identify high-risk areas in advance, achieve early warning and timely governance, and effectively solve the problem of low evaluation accuracy caused by the high subjectivity of the integrity analysis and evaluation method in the prior art, which makes it impossible to conduct a more objective quantitative evaluation of the wellbore integrity risk.

The present application relates to coal mine gas extraction technology and equipment technical field, specifically relates to gas extraction drilling intelligent plugging-displacement production-increase redundancy protection integrated equipment and method, the equipment includes carbon dioxide displacement system, grouting system and gas extraction system, intelligent control system, the present application can carry out intelligent plugging to gas extraction drilling, greatly limit the airtightness of drilling is guaranteed, can displace the adsorbed gas in each layer, improve the extraction amount of gas, reduce the gas outburst risk, and increase the redundancy protection such as emergency closure device, increase the safety of extraction equipment. Greatly reduce the cost of manual intervention, improve the sealing effect of drilling plugging, compared with ordinary drilling plugging, improve the gas production, increase the safety of gas extraction operation.

The application discloses a kind of carbon dioxide drive injection well casing automatic pressure supplement device and automatic pressure supplement method, comprising: carbon dioxide storage tank;High-pressure injection pump, inlet is connected with the outlet of carbon dioxide storage tank, outlet is connected with the inlet of first tubing valve;Casing protection liquid storage tank;Reciprocating piston cylinder, one side of piston is A cavity, the other side of piston is B cavity;The end of reciprocating piston cylinder A cavity upper port is connected with the outlet of second tubing valve by first switch valve, the end of reciprocating piston cylinder A cavity lower port is connected with carbon dioxide absorption tank by second switch valve;The outlet of casing protection liquid storage tank is connected with the end of reciprocating piston cylinder B cavity upper port by third switch valve, the end of reciprocating piston cylinder B cavity lower port is connected with protection liquid injection pipeline by fourth switch valve, and the outlet of protection liquid injection pipeline is connected with the inlet of casing valve. Including gas injection, casing pressure supplement, piston reversing, circulating pressure increasing and the like steps. The application can accurately control casing differential pressure, reduce gas seal pipe column and packer leakage risk.

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 relates to the technical field of oil and gas field development, in particular to a characterization method for quantifying contribution degrees of different mechanisms to improvement of gas reservoir recovery efficiency, which comprises the following steps: constructing an equivalent long rock core through a permeability harmonic average value, and restoring real reservoir seepage characteristics; three groups of experiments of natural exhaustion, static pressurization re-exhaustion and continuous gas injection displacement are adopted to realize physical decoupling of pressurization energy supplementation and a physical displacement mechanism; in combination with a homologous rock powder adsorption experiment, competitive adsorption contribution is accurately determined; a quantitative calculation model is established based on experimental data, and independent increments and comprehensive contribution degrees of the three mechanisms are obtained respectively. The method can solve the problem that the independent contribution degree of each single mechanism to extraction cannot be objectively and accurately quantified in the technology for improving the natural gas recovery efficiency through carbon dioxide displacement in the prior art.

The invention relates to the technical field of oilfield development, and discloses a method for improving carbon dioxide oil displacement effect, which comprises the following steps: (1) injecting a first composition into an oil reservoir, and then injecting carbon dioxide; wherein the first composition comprises xanthan gum, silicate and an optional first solvent; (2) injecting a second composition into the oil reservoir, and then injecting carbon dioxide; wherein the second composition comprises fatty alcohol polyoxyethylene ether sulfate, alkyl hydroxypropyl phosphate betaine, alkyl glycoside, coconut oil diethanolamide and an optional second solvent. By means of the method, the problem that the oil extraction rate is reduced due to gas channeling in an oil field can be effectively solved. According to the method, the fluidity of carbon dioxide gas in a reservoir high-permeability area or a crack can be effectively reduced, and the gas flooding sweep range is expanded, so that the carbon dioxide oil flooding effect is improved.

The present application provides a carbon dioxide flooding channeling blocking agent and a preparation method thereof, relating to the field of oilfield development technology. The carbon dioxide flooding channeling blocking agent comprises: 8-15% reactive monomers, 1.5-2% N-sulfonated chitosan, 0.5-1% cross-linking agent, 0.1-0.5% initiator, and the balance being water; the reactive monomers comprise a first monomer and a second monomer, 2-acrylamido-2-methylpropanesulfonic acid. The channeling blocking agent has low viscosity at room temperature before gelling, making it easy to pump into the formation. After gelling, it has high strength, good temperature resistance, excellent salt resistance, and strong plugging properties. It can be used to prevent and control carbon dioxide gas channeling during carbon dioxide flooding production.

The invention belongs to the technical field of CO2 geological sequestration experiment evaluation in a CCUS-EOR project, and particularly relates to a carbon dioxide reservoir sequestration effect experiment comprehensive evaluation method. The method comprises the following steps: carrying out a carbon dioxide displacement saturated oil-water rock core experiment, simulating an actual oil reservoir CO2 injection and geological storage process, and calculating a storage evaluation index of CO2 in an experiment simulated oil reservoir on a rock core scale in combination with experimental test data; and quantitatively evaluating the carbon dioxide reservoir storage effect of the target reservoir under the corresponding working conditions by using the core scale CO2 storage index. The technical problem that a CO2 storage experiment method and a storage index quantitative evaluation method for oil reservoirs in the later stage of water flooding development are lacked at present is solved.

The invention discloses a gas injection development scheme optimization method based on carbon dioxide oil displacement, which comprises the following steps: 1) obtaining production characteristic related data of related wells using carbon dioxide oil displacement in a research area, and comparing and analyzing the production characteristics of each well; 2) selecting a general state equation set sub-simulator of numerical simulation software to carry out gas drive reservoir modeling according to reservoir characteristics of an oil area and the reality of an oil field and aiming at the characteristics of gas drive reservoir numerical simulation; 3) geologic modeling is carried out, wherein the geologic modeling comprises establishment of a grid data field, establishment of table data and establishment of a dynamic model; 4) performing oil reservoir development history fitting; and (5) according to the final oil reservoir model, injection-production parameter optimization and periodic water injection development index prediction are carried out, and an optimized test well group gas injection development scheme is obtained. According to the method, carbon dioxide oil displacement numerical simulation is carried out, corresponding reasonable mining method research and development scheme optimization research are carried out, and a scientific and reasonable water-gas alternate gas injection recovery efficiency improving scheme can be effectively guided and formulated.

The application discloses a kind of carbon dioxide geological storage in situ condition wellbore sealing evaluation device and method, including corrosion wellbore test module, carbon dioxide displacement module, gas channeling simulation module, wellbore temperature and pressure control module and formation temperature and pressure control module, corrosion wellbore test module includes wellbore combination and test shell, wellbore combination is worn in test shell, and the top end between wellbore combination and the top end of test shell and the bottom end between wellbore combination and the bottom end of test shell form closed cavity, the top end of test shell is equipped with gas flowmeter, and test shell is sequentially provided with confining pressure bin and heating bin along the radial direction away from wellbore combination, the lithology-temperature-pressure-carbonic acid environment in the carbon dioxide geological storage process can be simulated by the application, the sealing capacity under the in situ service condition of evaluation wellbore is realized, to play the purpose of optimizing cement slurry formulation, optimizing casing material, reducing carbon dioxide leakage risk.

The present invention belongs to the field of natural gas waste energy recovery and utilization, and discloses a waste energy utilization system and method for dense-phase carbon dioxide-driven shale gas production. The system includes a CO2 injection system and a gas production and waste energy recovery system. The CO2 injection system includes a shale gas-CO2 heat exchanger, a CO2 booster, a CO2 condenser, a CO2 dense-phase injection pump, and a CO2 aftercooler, which are sequentially connected by pipelines. The gas production and waste energy recovery system includes a shale gas pre-separation unit, a shale gas turbine expander, a CO2 aftercooler, a CO2 condenser, and a shale gas-CO2 heat exchanger, which are sequentially connected by pipelines. The present invention achieves the effective coupling of a CO2-driven shale gas production process (CO2-ESGR) with shale gas wellhead pressure energy utilization technology. By comprehensively utilizing waste energy, the present invention reduces the energy consumption of single-well development in shale gas fields driven by CO2 injection by over 55%.

The invention relates to an oil reservoir injection-production optimization method, system and equipment fusing multiple proxy models. The method comprises the steps that a geologic model and a carbon dioxide flooding three-phase component model are established; determining constraint conditions, and obtaining an initial population; determining a target function; compiling a reference vector guide optimization algorithm code fusing multiple proxy models, and establishing a target database based on the carbon dioxide flooding three-phase component model, the initial population and the target function; adjusting parameters of the plurality of proxy models based on the plurality of established target databases; generating a filial generation population based on a genetic algorithm, and executing a reference vector guided optimization algorithm to update the target database; based on a given agent updating condition and the updated target database, preferably selecting an agent model of each stage; and obtaining a non-dominated scheme set of carbon dioxide flooding and a corresponding digital-analog result based on the optimized agent model of each stage. The method can be widely applied to the field of oil reservoir production optimization.