205 results about "Carbon dioxide flooding" patented technology

The invention relates to the technical field of oilfield development, and discloses a CO2 enhanced petroleum recovery and underground synchronous storage system for old oilfield reutilization, which comprises a data acquisition module for acquiring geological data of a target old oilfield; the mechanism model creating module creates a mechanism model according to the geological data of the target old oil field to obtain initial injection-production parameters; the prediction model creating module obtains and matches historical geological data of the oil reservoir subjected to carbon dioxide flooding, and creates a prediction model based on the oil reservoir meeting the matching degree; the injection-production parameter optimization module is used for obtaining optimal injection-production parameters through iterative updating of a grey wolf optimization algorithm based on the prediction model; and the verification module is used for comparing and analyzing the initial injection-production parameters and the optimal injection-production parameters to obtain final injection-production parameters. According to the method, the injection-production parameters can be optimized, so that the efficiency of old oil field recovery and carbon dioxide sequestration is improved.

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 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 provides a shaft paraffin removal period prediction method, and belongs to the field of petroleum and natural gas industry. The method comprises the following steps: firstly, collecting wax deposition experimental data of the carbon dioxide flooding production well under a simulated working condition and calculating a wax deposition rate experimental value; secondly, preprocessing the sample data; constructing an initial random forest regression model, and optimizing hyper-parameters in the model by using a Bayesian algorithm; training the optimized random forest model by using the processed sample data of the carbon dioxide flooding production well under the simulated working condition; then wax precipitation real-time data of the working condition of the carbon dioxide flooding production well is obtained; inputting real-time wax deposition data into the trained random forest model, and predicting a real-time wax deposition rate; and finally predicting the paraffin removal period according to the paraffin deposition rate. By adopting the method, the prediction precision of the wax deposition rate can be improved, and accurate guidance is provided for determining the paraffin removal period of the shaft.

The invention relates to the technical field of oil exploitation, in particular to a carbon dioxide drive shaft cold damage prevention device and a using method. According to the technical scheme, an oil pipe and a small-diameter oil pipe are connected with an anti-blocking jet flow drainage and production pump, the anti-blocking jet flow drainage and production pump is installed in the middle of an oil well, the lower end of the anti-blocking jet flow drainage and production pump is connected with an underground gas-liquid separator through the oil pipe, and the lower portion of the underground gas-liquid separator is connected with a fin type heat exchanger. The lower portion of the fin type heat exchanger is connected with a depressurization and degassing heat exchanger, and the depressurization and degassing heat exchanger is located below the oil layer. The device has the advantages that the cooling problem in an oil extraction production shaft caused by heat absorption in the carbon dioxide gasification process can be solved, the situation that a liquid flow channel is blocked due to wax precipitation and freezing of crude oil caused by cooling is avoided, and the corrosion problem of carbon dioxide to a pipe column can be greatly solved due to doping of power liquid; in addition, the anti-well-flushing wax dissolving and plug removal can be achieved, re-operation is avoided, and the operation cost is reduced.

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 relates to the technical field of wellbore risk evaluation, in particular to a carbon dioxide flooding injection well wellbore integrity risk quantitative evaluation method, which comprises the following steps: constructing an injection well integrity evaluation hierarchical structure model; determining a weight coefficient of each risk index; respectively evaluating each risk index; and calculating a total risk grade score and determining a risk grade. Through the hierarchical model and the determination of the weight coefficient, various risk factors can be comprehensively considered, and detailed evaluation of the integrity of the shaft is realized. Acquisition of real-time data and parameter correction ensure the accuracy and timeliness of an evaluation result, in addition, the method can recognize a high-risk area in advance, early warning and timely treatment are achieved, and the problem that in the prior art, due to the fact that an integrity analysis evaluation method is large in subjectivity, the accuracy and timeliness of the evaluation result are poor is effectively solved. Therefore, the problem of low evaluation accuracy caused by the fact that the integrity risk of the shaft cannot be evaluated more objectively and quantitatively is solved.

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 belongs to the technical field of oil-gas field development tertiary oil recovery and unconventional oil-gas development, and discloses a low-permeability-tight oil reservoir carbon dioxide injection effective displacement distance evaluation method, which comprises the following steps: obtaining several groups of different permeability core starting pressure gradients, and obtaining a quasi-starting pressure gradient according to the starting pressure gradients; establishing a mathematical relationship between the real starting pressure gradient and the permeability and a mathematical relationship between the quasi-starting pressure gradient and the permeability; effective displacement distances of reservoirs with different permeability under different pressure gradient conditions are obtained through calculation, and an effective displacement distance and permeability relation chart is established; according to the oil field early-stage oil production well average well bottom pressure, oil production well bottom pressure is obtained, and then the pressure gradient between the gas injection well and the oil production well is obtained; and according to the actual permeability of the oil reservoir and the pressure gradient between the gas injection well and the oil producing well, the actual effective displacement distance of oil reservoir carbon dioxide flooding is obtained. According to the method, the limiting distance of fluid flowing is simply calculated by using a limiting well spacing method, the method is simple and rapid, and few basic parameters are needed.

The invention provides a carbon dioxide flooding thickening agent as well as a preparation method and application thereof. The carbon dioxide flooding thickening agent has a structure as shown in a formula I, the weight-average molecular weight of the carbon dioxide flooding thickening agent is 8000 to 50000. According to the invention, the compound with the structure as shown in the formula I is used for thickening the carbon dioxide, and meanwhile, the weight-average molecular weight of the compound is within a specific range, so that the compound has good solubility with the carbon dioxide, high solubility in the carbon dioxide and good tackifying performance, the viscosity of the carbon dioxide is effectively improved, and the mining efficiency is improved; the use of fluorine-containing and silicon-containing materials is avoided, and the method is green, environment-friendly and low in cost.

The invention relates to the field of gas reservoirs, and discloses a dynamic characterization method, system, equipment and medium after breakthrough of carbon dioxide flooding of a gas reservoir. The dynamic characterization method after gas reservoir carbon dioxide flooding breakthrough comprises the steps that a gas reservoir rock core is collected, and attributes of the rock core are measured; sequentially connecting the cores in series according to the arrangement coefficients to form a long core; performing a long core carbon dioxide displacement natural gas experiment to obtain an experiment value; creating a long core numerical simulation model for long core carbon dioxide displacement natural gas simulation to obtain a simulation value; calculating a post-breakthrough dynamic representation parameter value based on the experiment value and the simulation value; updating the permeability of each section of rock core after carbon dioxide breakthrough by adopting a particle swarm algorithm to obtain a long rock core model of an optimal post-breakthrough dynamic characterization parameter value; and based on the long core model of the optimal post-breakthrough dynamic characterization parameter value, carbon dioxide displacement natural gas is simulated, and the post-breakthrough dynamic characteristics of carbon dioxide are obtained. According to the invention, accurate characterization of production dynamics after carbon dioxide flooding breakthrough 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 provides an anti-gas channeling plugging composition and application thereof. The anti-gas channeling plugging composition comprises a first system and a second system, the first system comprises a cross-linking monomer, a cross-linking agent, a gelling control agent and an initiator; the second system comprises lauryl sodium sulfate and N, N, N ', N'-tetramethyl-1, 3-propane diamine. The anti-gas channeling plugging composition provided by the invention comprises two systems which have complementary effects, and when the anti-gas channeling plugging composition is used in carbon dioxide flooding exploitation, the plugging rate is high and the application range is wide.

The invention relates to the field of environment monitoring, in particular to a carbon leakage earth surface monitoring method for a carbon dioxide flooding storage engineering field, which comprises the following steps: S1, acquiring the distribution of injection production wells in a to-be-detected area, and selecting different point positions for monitoring; s2, estimating the diffusion rate of soil CO2 gas into free air, calculating soil gas flux data, and collecting soil moisture and temperature data; s3, the carbon dioxide flux of the corresponding area is obtained, and the surface concentration of carbon dioxide at different point positions is obtained through an infrared gas analyzer; s4, determining whether carbon dioxide leakage exists in the region or not according to the surface concentrations of the carbon dioxide at the different point locations; wherein the method for selecting different point locations in the step 1 is to select 2-4 point locations with the longest accumulated injection time in an engineering field for detection, and the linear relation between the selected point locations and the injection time is Y (t) = 0.08 t + 0.5. According to the monitoring method, earth surface sampling monitoring is selected, large-range encryption point distribution is achieved, cost is low, the geological structure cannot be damaged, cost is reduced, and safety is improved.

The invention discloses a carbon dioxide burying mechanism contribution rate quantitative splitting method, belongs to the technical field of oil and gas field development, and solves the problem that the contribution rates of different sealing mechanisms to the CO2 sealing amount cannot be quantitatively split in the prior art. A carbon dioxide oil displacement experiment is conducted, carbon dioxide gas is injected into the displacement rock core, and the water dissolution and storage contribution rate, the oil dissolution and storage contribution rate and the retention and storage contribution rate in the carbon dioxide oil displacement process are calculated; according to the method, a carbon dioxide water displacement experiment and a carbon dioxide oil displacement experiment are combined, on the basis of the mass conservation theory, the calculation method for the contribution rate of different quantitative splitting sealing mechanisms to the carbon dioxide sealing amount is established, the carbon dioxide burying potential under different geological conditions can be accurately evaluated, and therefore the optimal burying site is selected.

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 embodiment of the invention provides a gas channeling risk early warning method, device and equipment and a storage medium, and belongs to the technical field of oil and gas field development. According to the method, when the carbon dioxide flooding technology is used for crude oil extraction of the production well, the current gas channeling risk of the target object is judged by detecting the gas-oil ratio and the carbon dioxide content, proper anti-channeling measures can be made and implemented in time according to the gas channeling risk, and the oil extraction rate can be increased.

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 relates to the technical field of carbon dioxide injection oil extraction, in particular to a method for calculating the amount of carbon dioxide produced by an oil well, which comprises the following steps of: calculating the oil sleeve annulus volume of the oil well in a carbon dioxide injection oil extraction test area based on the sleeve radius, the oil pipe radius and the height of a gas column in the oil sleeve annulus; calculating a first compression factor and a second compression factor corresponding to the first gas component based on the first wellhead temperature, the first annulus pressure, the second wellhead temperature and the second annulus pressure; on the basis of the second variable quantity and the testing duration, the instantaneous gas production rate of the carbon dioxide gas of the carbon dioxide injection oil extraction well in the testing process is calculated; the invention provides a method for calculating the carbon dioxide output of an oil well, which is suitable for oil reservoirs implementing carbon dioxide injection oil extraction technologies such as carbon dioxide flooding and carbon dioxide huff and puff, and can realize rapid calculation of the carbon dioxide injection oil extraction test area oil well output. And data support is provided for evaluating the carbon dioxide gas channeling condition of the oil well and calculating the carbon dioxide burying amount.

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 embodiment of the application provides a carbon dioxide displacement crude oil simulation device, and relates to the technical field of oil and gas development.The device comprises a simulation mechanism and an injection mechanism;the injection mechanism is connected with a first simulation component in a plurality of simulation components through a conduit, and the injection mechanism is used for injecting CO2 gas or crude oil into the plurality of simulation components;the simulation component comprises a holder, a gas-liquid separation component, a gas-liquid mixing component and a booster pump, which are sequentially connected through the conduit; a gas flow meter and a liquid flow meter are arranged on the gas-liquid separation component; the last simulation component in the plurality of simulation components only comprises the holder; an outlet pipe of the holder of the last simulation component is communicated with an inlet of a back pressure valve; a measuring bottle is communicated with an outlet of the back pressure valve through a first conduit; an inlet of a gas meter is communicated with the measuring bottle through a second conduit; and the technical scheme provided by the embodiment of the application can improve the accuracy of the measured CO2 oil displacement efficiency of each core.

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.