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179 results about "Co2 flooding" patented technology
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CO2 flooding system or central bank CO2 system is one of the common fixed fire fighting system installed on most of the ships. It releases carbon dioxide (CO2) in bulk quantity to a protected space (such as engine room, cargo hold, purifier room, pump room, etc.) under fire.
Carbon dioxide oil-displacing nmr imaging detection device
InactiveCN101458218AEasy to meet high pressure strength requirementsCompact designWater resource assessmentAnalysis using nuclear magnetic resonancePorous mediumImage detection
A carbon dioxide drive nuclear magnetic resonance imaging detection device belongs to the technical field of petroleum engineering and technology. The detection device comprises: a simulation core device which is arranged in a nuclear magnetic resonance imaging device; an injection system which sequentially injects formation water, crude oil and supercritical carbon oxide into the simulation core device; a measurement and control system which is employed to control pressure and temperature of the whole system; the nuclear magnetic resonance imaging device which is employed to detect and perform quantitative analysis on an image to be tested to obtain voidage and permeability of a porous medium, and saturation seepage parameters of the supercritical carbon oxide, the formation water and the crude oil; and an output measuring system which is employed to measure volumes of the carbon dioxide gas, the formation water and the crude oil. The detection device has a design pressure of 0-40MPa and design temperature of 0-180 DEG C, and can simulate experimental studies of different displacement schemes of the supercritical CO2 under a complex petroleum reservoir condition; the simulation core device is made of a brass material, which produces no magnetism, satisfies requirements for high pressure and strength, has a compact structure, can be recycled, is conveniently operated, simple and applicable in an experimentation.
Owner:DALIAN UNIV OF TECH
Method for applying gas-soluble surfactant to fluidity control of carbon dioxide oil displacement
The invention relates to a method for applying a gas-soluble surfactant to fluidity control of carbon dioxide oil displacement. The method comprises the following steps that the gas-soluble surfactant and supercritical carbon dioxide are evenly mixed according to the mass percent of 0.1%-1.5%, during mixing, pressure is 7-20MPa, temperature is from 40 DEG to 90 DEG C, then the mixture is poured into an oil reservoir. The gas-soluble surfactant is applied to carbon dioxide oil displacement for the first time, and the selected carbon dioxide oil displacement has a certain solubility in water and the supercritical carbon dioxide respectively. When the gas-soluble surfactants of the type are adopted for underground foaming to control the fluidity of the carbon dioxide, an aqueous phase carry underground injection method can be selected, and a supercritical carbon dioxide phase carry underground injection method also can be selected, so that the method for applying the gas-soluble surfactant to fluidity control of carbon dioxide oil displacement not only can be applied to fluidity control in the carbon dioxide oil displacement process of a low permeability reservoir, but also can be applied to fluidity control in the carbon dioxide oil displacement process of a conventional oil reservoir and a high permeability reservoir.
Owner:CHINA UNIV OF PETROLEUM (EAST CHINA)
Experimental device researching influence of formation water with high degree of mineralization on CO2 flooding
InactiveCN106908579AImprove securityAvoid corrosionEarth material testingFluid removalPorosityGas cylinder
The invention provides an experimental device researching influence of formation water with a high degree of mineralization on CO2 flooding. The experiment device comprises a gas cylinder, a core holding unit and a gas-liquid separating device. The gas cylinder is connected to a piston container, the top of the piston container is connected to a back-pressure valve and a pressure gage, the bottom of the piston container is connected to an ISCO pump, the pressure gage is connected to the core holding unit, the outlet end of the core holding unit is connected to the gas-liquid separating device, and the gas-liquid separating device is connected to an upper computer through a gas flowmeter. The back-pressure valve is connected to the back-pressure valve, the side face of the core holding unit is connected to a circular pressing pump and the suction lift is high, the outlet of the core holding unit is connected to the back-pressure valve, and the back-pressure valve is connected to a back-pressure pump. The designed device can compare changes of core permeability after and before CO2 flooding, porosity, pore structures, contents of core minerals, surface shapes of the cores, masses of the core and the recovery rates and research influence of CO2 flooding on reservoir physical property and development parameters.
Owner:ZHEJIANG OCEAN UNIV
Method for evaluating sealing properties of cap rocks in carbon dioxide flooding storage
ActiveCN107506534AHigh precisionDesign optimisation/simulationSpecial data processing applicationsPorosityWell logging
The invention discloses a method for evaluating sealing properties of cap rocks in carbon dioxide flooding storage, and belongs to the field of a carbon dioxide flooding process. The method is characterized by comprising the following steps of 1) building a carbon dioxide geological storage body well log response model; 2) determining a regional cap rock, a direct cap rock and an interlayer in a reservoir; 3) compiling a cap rock plane distribution chart, and determining cap rock player plane distribution feature parameters; 4) calculating a seepage velocity of carbon dioxide of each phase state in the cap rocks, and establishing percolation comprehensive evaluation parameters; 5) building a porosity and displacement pressure fitting model and a permeability and throat feature parameter fitting model; 6) performing numerical simulation on a reaction process of different chemical substances in the cap rocks, and determining erosion resistance of different cap rocks; and 7) establishing evaluation indexes for the seal properties of the cap rocks in the carbon dioxide flooding storage of an oil field, thereby performing comprehensive evaluation on the sealing abilities of the cap rocks. According to the method, multi-factor stereoscopic comprehensive evaluation is performed for the cap rocks, so that the precision of evaluating the sealing abilities of the cap rocks is greatly improved.
Owner:SHAANXI YANCHANG PETROLEUM GRP
CO2 flooding minimum miscrible pressure prediction method
ActiveCN104462753AQuick forecastForecasting economyFluid removalSpecial data processing applicationsCo2 floodingProcess engineering
The invention relates to a CO2 flooding minimum miscrible pressure prediction method, and belongs to the technical field of increasing the recovery ratio through CO2 flooding. The method includes the steps of firstly, determining basic characteristic parameters of in-place oil, wherein the basic characteristic parameters include the size of dead oil, the size of discharged in-place oil, the mass of the dead oil, the size of gas discharged through flashing under the standard condition and the density of the gas discharged through flashing under the standard condition; predicting parameters by determining the CO2 minimum miscrible pressure, wherein the parameters include the size coefficient of the in-place oil, the density of the in-place oil and the temperature of the in-place oil; predicting the CO2 flooding minimum miscrible pressure through the combination with the CO2 minimum miscrible pressure empirical constant. According to the method, the CO2 flooding minimum miscrible pressure is predicted only through the size coefficient and the density of the in-place oil and the temperature parameter of the in-place oil, the number of required experimental data is small, calculation is easy, and the CO2 flooding minimum miscrible pressure of a target oil deposit can be rapidly, economically and accurately predicted.
Owner:CHINA PETROLEUM & CHEM CORP +1
Multistage fracturing horizontal well inter-crack interval CO2 flooding oil extraction method
ActiveCN106194131AImprove production statusEnhanced overall recoveryFluid removalBottom hole pressureCo2 flooding
The invention relates to a multistage fracturing horizontal well inter-crack interval CO2 flooding oil extraction method. The method includes following steps: performing sectional fracturing on a horizontal well shaft to form multiple fracturing cracks perpendicular to the horizontal well shaft; mounting an oil pipe I and an oil pipe II in a casing in the horizontal well shaft, mounting flow controllers I at positions, corresponding to even-level cracks, of the oil pipe I, mounting flow controllers II at positions, corresponding to odd-level cracks, of the oil pipe II, and arranging a packer at a position, between the odd-level cracks and the even-level cracks, in an annular space of an oil jacket; at an initial production stage, utilizing natural energy for extraction until bottom hole pressure is lowered to bubble point pressure, and utilizing crack intervals for extraction, injecting CO2 into the oil pipe I, wherein CO2 enters the even-level cracks, and crude oil is output from the odd-level cracks and enters the oil pipe II at the same time; when oil yield is lower than economic limit yield, stopping injecting CO2. By the method, crude oil recovery rate can be increased substantially, and gas channeling can be inhibited effectively.
Owner:CHINA UNIV OF PETROLEUM (BEIJING)
Oil recovery method restraining channeling in CO2 flooding process in low-permeability fractured reservoir through two-stage channeling blocking
The invention provides an oil recovery method restraining channeling in the CO2 flooding process in a low-permeability fractured reservoir through two-stage channeling blocking so as to increase the oil recovery ratio. The two-stage channeling blocking technology comprises the steps that a strong adhesive system with a natural modified polymeric material as the main agent is injected and forms a high-strength adhesive through waiting on cement setting to block off a fracture; fatty amine serves as a channeling blocking agent to block off channeling, caused by a relatively high-permeability layer in a low-permeability matrix, of low-viscosity CO2. By means of the two-stage channeling blocking technology, channeling in the CO2 flooding process in the low-permeability fractured reservoir can be effectively controlled, the swept volume can be increased, and therefore the oil recovery ratio can be increased.
Owner:CHINA UNIV OF PETROLEUM (BEIJING)
Device and method for determining change law of oil-water interfacial tension in CO2 oil displacement process
Owner:CHINA PETROLEUM & CHEM CORP +1
Minimum miscible phase pressure computing method of low-permeability reservoir CO2 flooding
InactiveCN108266165ACalculation is simple and fastSuitable for useSurveyConstructionsExperimental methodsCo2 flooding
The invention provides a minimum miscible phase pressure computing method of low-permeability reservoir CO2 flooding. The minimum miscible phase pressure computing method of low-permeability reservoirCO2 flooding comprises the following steps that minimum miscible phase pressure and underlying parameters of four or more samples are obtained by adopting a slim-tube displacement experimental method; the underlying parameters of the four or more samples are substituted through a theoretical formula method to calculate and obtain the minimum miscible phase pressure ; the minimum miscible phase pressure error of a same sample is obtained by comparing the slim-tube displacement experimental method and the theoretical formula method, and empirical constants are obtained by substituting the underlying parameters of four selected samples into a logarithm formula and establishing an augmented matrix; and a computational formula model is obtained by fitting the minimum miscible phase pressure ina low permeability reservoir and the underlying parameters. According to the minimum miscible phase pressure computing method of the low-permeability reservoir CO2 flooding, the minimum miscible pressure determined by the slim-tube displacement experimental method is more accurate, the theoretical formula method is more convenient and fast, and the cost is lower; at the same time, calculation requirements of the low-permeability reservoir in the Northern Jiangsu Basin can be met, a new derivation computational formula is more accurate in computational accuracy, the theoretical basis is higher, the labor intensity is low, and the minimum miscible pressure computing method of the low-permeability reservoir CO2 flooding is suitable for the use of low-permeability reservoir in the Northern Jiangsu Basin.
Owner:CHINA PETROLEUM & CHEM CORP
Aqueous solution for improving CO2 flooding effect of tight reservoir and preparation method and application method of aqueous solution
The invention discloses an aqueous solution for improving a CO2 flooding effect of a tight reservoir and a preparation method and an application method of the aqueous solution. The aqueous solution isprepared from, by the total weight of the aqueous solution, 0.01-0.2wt% of a wettability modifier, 0.01-0.1wt% of a penetrating agent, 0.05-0.5wt% of a surfactant for reducing oil-water interfacial tension and the balance water. The technical scheme includes that the aqueous solution, prepared from the wettability modifier, the penetrating agent and the surfactant for reducing oil-water interfacial tension, for improving the CO2 flooding effect of the tight reservoir and CO2 are alternately injected into the reservoir; the wettability modifier modifies micropore surface wettability of a matrix, molecules of the surfactants capable of reducing oil-water interfacial tension permeate into micropores of the matrix under the promoting action of the penetrating agent to expel crude oil out of the micropores under the action of imbibition and the like to reach cracks, and the effect of increasing the oil recovery rate is achieved by CO2 flooding.
Owner:CHINA PETROLEUM & CHEM CORP +1
Method for simulating flow of supercritical CO2 in displacement of natural gas with supercritical CO2
ActiveCN107621350ASolve the problem of difficult fitting of high-pressure physical propertiesHydrodynamic testingFluid removalDiffusionMathematical model
The invention provides a method for simulating the flow of supercritical CO2 in displacement of natural gas with the supercritical CO2. The method comprises the following steps that: a three-dimensional geological model is established according to the geological characteristics of a gas reservoir; a fluid model is established through an improved state equation, so that the basic parameters of thefluid of the gas reservoir are determined; the diffusion coefficient of the CO2 is determined; the multi-component numerical simulation model of the displacement of the natural gas with the supercritical CO2, which considers diffusion, is established; and corresponding relations between different CO2 flooding quantities and natural gas production quantities are calculated through using the model.The present invention provides the new mathematical model and processing method to simulate the flow characteristics of the supercritical CO2 in the displacement of the natural gas with the supercritical CO2. Compared with a conventional numerical model, the model can better evaluate the flow characteristic of the CO2 in the displacement of the natural gas and the displacement effect of the CO2.
Owner:CHINA PETROLEUM & CHEM CORP +1
Experiment method for researching influence on CO2 flooding by highly-mineralized formation water
ActiveCN106884634AAvoid corrosionImprove corrosion resistanceFluid removalPrecipitationPhysical property
The invention provides an experiment method for researching influence on CO2 flooding by highly-mineralized formation water. The experiment method includes the following steps that a slabbed core A and a slabbed core B are cut from the two ends of a rock core, the rock core is washed, dried and weighed, the rock core pore volume and the gas logging permeability are measured, the rock core is saturated, magnetic resonance imaging is detected, and flooding is carried out to obtain rock core water logging permeability; flooding is carried out, temperature and pressure are kept for placement, CO2 water and gas injection is conducted, the rock core is washed and dried, the mass, the pore volume and the gas logging permeability are measured, vacuumizing is carried out, the rock core is saturated, flooding is carried out to measure the rock core water logging permeability, and magnetic resonance imaging is conducted; a slabbed core C and a slabbed core D are cut from the two ends of the rock core, washed and dried, electron microscope scanning, surface element and rock mineral analysis are carried out on the slabbed core A, the slabbed core B, the slabbed core C and the slabbed core D, the steps 1-3 are repeated after replacing the rock core and changing the temperature and the pressure; data is collected. The influence on reservoir physical property and development parameter collection by CO2-water-rock interaction and CO2-formation water precipitation can be researched.
Owner:ZHEJIANG OCEAN UNIV
Adjustor for reducing minimum miscible pressure of CO2 non-miscible flooding and application method thereof
The invention relates to an adjustor for reducing the minimum miscible pressure of CO2 non-miscible flooding and an application method thereof and belongs to the technical field of enhancing the oil recovery by CO2 flooding in an oil field. The adjustor is prepared from benzene homologs and derivates, ether matters, an oil soluble surfactant and a foaming agent. The application method comprises the following steps: (1) before carrying out CO2 flooding, injecting the adjustor into a reservoir by virtue of an injection well; and then braising the well till the adjustor is fully contacted with crude oil and dissolves; and (2) continuously injecting CO2 into the injection well till the gas-oil ratio in an output well exceeds the dissolved gas oil ratio under a formation condition. The adjustor provided by the invention has the beneficial effects that the adjustor can generate foam with CO2 to control the fluidity; meanwhile, as the benzene homologs and derivates, ether matters and oil soluble surfactant dissolved mutually promote so as to reduce the interfacial tension between CO2 and crude oil, so that the minimum miscible pressure of CO2 flooding is reduced, and the oil recovery of the CO2 flooding is improved to a great extent.
Owner:CHINA PETROLEUM & CHEM CORP +1
Gel particles suitable for low-permeability fractured carbon dioxide flooding oil reservoir and profile control agent as well as preparation method and application thereof
ActiveCN111234790AImprove acid resistanceGood heat resistance, salt resistance and acid resistanceFluid removalDrilling compositionFunctional monomerCo2 flooding
The invention relates to the technical field of oil field profile control and water plugging agents, in particular to gel particles suitable for a low-permeability fractured carbon dioxide flooding oil reservoir, a profile control agent, a preparation method and an application thereof. The gel particle is prepared from the following components in percentage by mass: 10 to 20 percent of an acrylamide monomer; 10-30% of an acid-resistant functional monomer; 1-3.0% of a temperature-resistant functional monomer; 1-3.0% of a salt-tolerant functional monomer; 1-2.0% of a cross-linking agent; 1-10% of an initiator; 0.2 to 1.0 percent of a reinforcing agent; and the balance of aqueous phase. By compounding the gel particles with a cationic polymer solution, the acid-resistant gel particle profilecontrol agent is obtained. The acid-resistant gel particle profile control system prepared by the method is good in temperature resistance, salt resistance and acid resistance and long in action validity period, can be used as an excellent low-permeability fractured CO2 flooding oil reservoir profile control system and is used for blocking a heterogeneous stratum with micro-fracture development.
Owner:CHINA UNIV OF PETROLEUM (EAST CHINA)
Device and method for surveying migration law of carbon dioxide during carbon dioxide flooding and sequestration
PendingCN110578500AAchieve displacementAchieve diffusionSurveyOther gas emission reduction technologiesCollection systemGas detector
The invention relates to the technical field of oil-gas field development and carbon dioxide underground storage, in particular to a device and a method for surveying a migration law of carbon dioxideduring carbon dioxide flooding and sequestration. The device comprises an injection system, a seal cavity clamping system and an information collection system; a formation condition is simulated inside the seal cavity clamping system, and an injection well and producing wells communicating with the bottom of a formation are arranged over the seal cavity clamping system; the injection system is connected with the seal cavity clamping system and injects a certain amount of carbon dioxide, and the producing wells are used for discharging crude oil to the outside; and the information collection system includes a gas detector and an information data processing computer, and the gas detector and the information data processing computer are in signal connection. The migration law of carbon dioxide can be simulated and obtained, and real-time plugging is performed when the diffusion range of carbon dioxide reaches a leakage threshold value; and a plugging technology is evaluated and has important significance in leakage prevention and sequestration of carbon dioxide in practical production.
Owner:PEKING UNIV +1
Channeling-preventing agent for extra-low permeation oil accumuiation carbonic anhydride oil displacement and application thereof
The invention provides a fleeing proof agent for the carbon dioxide flooding of oil reservoirs with ultra-low permeability and the application of the fleeing proof agent. The invention is characterized in that: the main agent of the fleeing proof agent is the amine substance of organic compounds; the fleeing proof agent comprises at least one amine substance and a release agent; the release agent is the ethanol comprising a certain amount of water, a hydrocarbon substance or nitrogen; the release agent is used to prevent the chemical reaction caused by the premature contact between the amine and the carbon dioxide. The invention is suitable for the gas channeling inhibition during the carbon dioxide flooding process for oil reservoirs with ultra-low permeability. The invention has the advantages that: the fleeing proof agent mainly block the gas channeling channel by the salt precipitation generated by the reaction between the carbon dioxide and the amine; the generation time of the salt precipitation is controlled by the injection volume of the release agent; the swept volume displaced by the carbon dioxide is enlarged, and the improvement of the economic benefit of carbon dioxide flooding is favored.
Owner:CHINA UNIV OF PETROLEUM (BEIJING)
Substance balance method for predicting carbon dioxide flooding oil reservoir indexes
ActiveCN104975827AOther gas emission reduction technologiesFluid removalInjection volumeMaterial balance
The invention provides a substance balance method for predicting carbon dioxide flooding oil reservoir indexes. The substance balance method for predicting the carbon dioxide flooding oil reservoir indexes comprises the following steps of: 1, giving application conditions of a carbon dioxide flooding substance balance equation; 2, building a substance balance equation applicable to the carbon dioxide flooding; 3, storing oil reservoir parameters and determining a calculation parameter; 4, calculating the parameters of the corresponding time period, wherein the parameters of the corresponding time period include the oil yield and the gas injection volume; and 5, using the parameters obtained through the calculation in the fourth step to determine the carbon dioxide flooding oil reservoir indexes such as the injection-production ratio and the recovery percent. The substance balance method for predicting carbon dioxide flooding oil reservoir indexes has the advantages that the substance balance equation which considers the compressibility of the oil reservoir rock fluid and is applicable to the carbon dioxide flooding is built; an application method of the substance balance equation is given; and an effective method is provided for predicting the carbon dioxide flooding oil reservoir indexes.
Owner:CHINA PETROLEUM & CHEM CORP +1
Dynamic estimation method for P-wave and S-wave velocities in carbon dioxide flooding process
InactiveCN106202879AImproving the Prediction Accuracy of P- and S-wave VelocityImprove forecast accuracySpecial data processing applicationsInformaticsShear modulusS-wave
The invention provides a dynamic estimation method for P-wave and S-wave velocities in a carbon dioxide flooding process. The method comprises the following steps: acquiring a total porosity and a pore aspect ratio after displacement by using existing base data and experimental data; acquiring bulk moduli and shear moduli of rock matrixes which are different in oil-gas-water contents by using a K-T equation respectively; building wave impedance volume versions with different oil-gas-water saturation degrees based on the experimental data and seismic data; calculating a mixed fluid bulk modulus and a mixed fluid density in secondary seismic acquisition; acquiring densities, the bulk moduli and the shear moduli of the rock matrixes in the secondary seismic acquisition by using a change formula of the porosity and the pore aspect ratio under the influence of a pressure; and acquiring the P-wave and S-wave velocities in seismic acquisition by using a Xu-White model. Through adoption of the dynamic estimation method for the P-wave and S-wave velocities in the carbon dioxide flooding process, a model is improved by a changed porosity and a changed pore aspect ratio, so that the P-wave and S-wave velocity prediction accuracy is increased, and dynamic estimation of the P-wave and S-wave velocities in the carbon dioxide flooding process is realized.
Owner:CHINA PETROLEUM & CHEM CORP +1
Experimental device and method for simulating heterogeneous reservoir CO2 flooding injection-production coupling
ActiveCN113090233AEnhanced overall recoveryEasy to operateSurveyOther gas emission reduction technologiesGraduated cylinderCo2 flooding
The invention discloses an experimental device and method for simulating heterogeneous reservoir CO2 flooding injection-production coupling. The experimental device comprises a displacement pump, intermediate containers, a core holder, a back-pressure valve, a back-pressure pump, a confining pressure pump and a measuring cylinder, wherein the intermediate containers comprise an intermediate container for containing an oil sample and an intermediate container for containing CO2. The experimental method comprises the following steps of: configuring the oil sample and a water sample for an experiment; testing the basic physical property of a core; establishing irreducible water saturation; keeping the formation condition to simulate reservoir formation aging; testing a CO2 injection-production coupling experiment; metering the pressure change of an injection end, the volumes of flooding oil and gas and the volume of accumulated injection gas in the displacement process; and evaluating the capacity of improving the recovery ratio of a heterogeneous reservoir in different injection-production coupling modes. The capacity of improving the recovery ratio of the heterogeneous reservoir in different injection-production coupling modes can be evaluated, and theoretical guidance is provided for oil field and mine field application.
Owner:CHINA UNIV OF PETROLEUM (EAST CHINA)
Alkynol-based imidazoline compound, corrosion inhibitor for carbon dioxide oil displacement, and preparations of alkynol-based imidazoline compound and corrosion inhibitor
ActiveCN106478510AGood corrosion inhibitionExcellent corrosion inhibition performanceOrganic chemistryCorrosion preventionCo2 floodingCorrosion inhibitor
The present invention discloses an alkynol-based imidazoline compound, a corrosion inhibitor for carbon dioxide oil displacement, and preparations of the alkynol-based imidazoline compound and the corrosion inhibitor, wherein the alkynol-based imidazoline compound has the following structure formula represented by a formula (I), and the corrosion inhibitor for carbon dioxide oil displacement comprises the alkynol-based imidazoline compound. According to the present invention, by improving the key alkynol-based imidazoline compound preparation method, the applications of the alkynol-based imidazoline compound, the application method and the like, the poor corrosion inhibition of the CO2 corrosion inhibitor can be effectively solved, and the corrosion inhibitor used for carbon dioxide oil displacement and prepared by using the alkynol-based imidazoline compound can effectively inhibit the corrosion on the pipeline during the carbon dioxide oil displacement process. The formula (I) is defined in the specification.
Owner:武汉楚博士科技股份有限公司 +1
Plugging agent for oil field gas driving
The invention discloses a plugging agent for oil field gas driving, and the plugging agent is mainly applied to profile control and water plugging employing a carbon dioxide flooding well in an oil field. The plugging agent comprises the following components in percentage by weight: 0.2%-0.7% of a plugging agent tackifier for oil field gas driving, 0.2%-1.5% of a cross-linking agent and the balance of water. The plugging agent is prepared by the following steps: firstly, adding clear water to a liquid dispensing tank at the ratio, starting stirring, and evenly scattering the plugging agent tackifier for oil field gas driving; and stopping stirring, so as to prepare the plugging agent for use after a thickening agent is completely dissolved and dispersed. The cross-linking agent is added according to the actual requirement ratio during fracturing construction. The plugging agent is convenient to prepare, and large in gelling viscosity when used by matching with the cross-linking agent; gas escape is relatively well prevented; and the plugging agent can play a good role in profile control and water plugging by using the carbon dioxide flooding well.
Owner:四川晨瑞石油化工有限责任公司 +1
CO2 flooding foam oil stream component determining method, and CO2 flooding simulation method
A CO2 flooding foam oil stream component determining method, and a CO2 flooding simulation method are provided; the CO2 flooding foam oil stream component content determining method comprises the following steps: a parameter determining step, determining the thermodynamics parameter, relative permeability and each component of the foam oil stream, and a bubble mol percentage; a component determining step, determining each component and bubble contents according to the parameters obtained in the previous step and a preset component model. The CO2 flooding foam oil stream component determining method uses the preset component model of foam oil stream in a CO2 injection process to accurately simulate the foam oil stream distribution and dynamic characteristic simulation in the gas injection process.
Owner:CHINA PETROLEUM & CHEM CORP +1
Method for oil displacement using carbon dioxide and foam
InactiveCN105134146AEasy to operateMake up for the shortcomings when used aloneFluid removalFoaming agentCo2 flooding
The invention discloses a method for oil displacement using carbon dioxide and foam. The method can be applied to low-permeability high-mineralization stratums, carbon dioxide and an aqueous solution containing a foaming agent are alternately injected to raise the efficiency of oil displacement, the low permeability means that the permeability is within the range of 1 to 10 mD, and the high mineralization means that the mineralization is less than 100 g / L. The method for oil displacement using carbon dioxide and foam is easy to operate, oil displacement using carbon dioxide and oil displacement using foam are combined, defects of oil displacement using a single material can be overcome, and the efficiency of oil displacement in low-permeability high-mineralization stratums can be distinctly raised.
Owner:NORTHWEST UNIV(CN) +1
Low-cost oil-based annulus protection fluid applicable to CO2 flooding well and preparation method thereof
InactiveCN107603579AReduce corrosionImprove protectionBorehole/well accessoriesHydantoin derivativesMorpholine
The invention provides low-cost oil-based annulus protection fluid applicable to a CO2 flooding well and a preparation method thereof and belongs to the technical field of corrosion protection of an oil and gas well. A low-cost oil-based annulus protection fluid system applicable to the CO2 flooding well is prepared by compounding engine oil, a corrosion inhibitor, a bactericide, an oxygen removing agent, a density regulator and a surfactant. The annulus protection fluid is prepared from the following components in percentage by mass: 1 percent to 3 percent of a morpholine derivative compoundcorrosion inhibitor, 0.8 percent to 1.6 percent of halogenated hydantoin bactericide, 3 percent to 5 percent of the oxygen removing agent, 5 percent to 30 percent of an organic acid salt density regulator, 3 percent to 5 percent of a non-ionic type polyoxyethylene type surfactant and the balance of the engine oil. The oil-based annulus protection fluid provided by the invention has a very good protection effect on a shaft tubular column of the CO2 flooding well and has the advantages of good high-temperature stability, good low-temperature freezing resistance and long-period stability; meanwhile, the refrigeration engine oil is used as a dispersant, so that the low-cost oil-based annulus protection fluid has the advantages of low cost and the like.
Owner:SOUTHWEST PETROLEUM UNIV
CO2 flooding output gas separation and reinjection integrated method
ActiveCN104481472AEnhanced overall recoveryFew stepsFluid removalDrilling compositionWater vaporSlurry
The invention relates to a CO2 flooding output gas separation and reinjection integrated method and belongs to the technical field of oilfield CO2 flooding oil recovery improving. The method comprises the steps of (1) pretreatment of output gas and separation of steam from more-than- C6 heavy hydrocarbon components; (2) preparation of hydrate oil displacement agents; (3) reinjection of hydrates into reservoir. According to the method, the production of the hydrates through the reaction of CO2 and C2-C5 through a hydrate method, the reaction condition is mild, the generated hydrate size can be re-injected into the reservoir directly, CO2 foam flooding and surface active agent flooding functions are provided, and the oil recovery rate can be improved; the hydrate generation accelerant added into the water solution is a surface active agent and has a high foaming capacity, CO2 and C2-C5 gas can act with the water solution to generate foam, and accordingly, functions of mobility control and oil washing are provided; meanwhile, CO2 flooding displacement crude oil mixed-phase pressure can be reduced by C2-C5, and accordingly, the CO2 flooding recovery rate is improved.
Owner:CHINA PETROLEUM & CHEM CORP +1
Compound type anti-gas-channeling agent for carbon-dioxide flooding
ActiveCN106995689AReduce viscosityImprove mobilityDrilling compositionCo2 floodingCarbon dioxide flooding
The invention provides a compound type anti-gas-channeling agent for carbon-dioxide flooding. The compound type anti-gas-channeling agent for carbon-dioxide flooding is prepared from the following raw materials: polymer gel and precipitate base fluid; on the basis that the total mass of the polymer gel is 100%, the polymer gel is prepared from the following raw materials: 0.5-1% of polyacrylamide, 0.1-0.5% of an organic metal crosslinking agent, 0.5-2% of a resin crosslinking agent, 0.05-0.2% of a stabilizing agent and the balance of simulation formation water; on the basis that the total mass of the precipitate base fluid is 100%, the precipitate base fluid is prepared from the following raw materials: 2-15% of a precipitation solution and the balance of simulation formation water. The compound type anti-gas-channeling agent for carbon-dioxide flooding is good in anti-gas-channeling effect.
Owner:CHINA UNIV OF PETROLEUM (BEIJING)
Sulfur element containing bicycloimidazoline derivant corrosion inhibitor
The invention discloses a sulfur element containing bicycloimidazoline derivant corrosion inhibitor. The corrosion inhibitor comprises 60-90 parts of sulfur element containing bicycloimidazoline derivant and 10-40 parts of solubilizing agent based on total mass parts; the two raw materials are successively fed into a reaction kettle in proportion, uniformly stirred under the condition of 80 DEG C, cooled and then discharged to obtain the sulfur element containing bicycloimidazoline derivant corrosion inhibitor. Compared with the prior art, the sulfur element containing bicycloimidazoline derivant corrosion inhibitor disclosed by the invention is more applicable to corrosion control over an in-service oil, gas, water multi-phase flow integrating conveying system on CO2 flooding oil field ground in a high water containing period, and the corrosion inhibition efficiency is capable of reaching more than 85%.
Owner:SINOPEC PETROLEUM ENG DESIGN
Petroleum reservoir carbon dioxide miscible flooding pressure prediction method and device
ActiveCN105401926APrediction is simpleFluid removalSpecial data processing applicationsSolubilityCo2 flooding
The invention provides a petroleum reservoir carbon dioxide miscible flooding pressure prediction method and device and relates to the technical field of petroleum reservoir exploitation. The method includes the steps that the basic parameters for predicting petroleum reservoir carbon dioxide miscible flooding pressure are obtained; the solubility parameter of petroleum is determined; petroleum reservoir initial reservoir pressure serves as the trial pressure value, the current trial pressure value and the carbon dioxide density at the petroleum reservoir temperature are determined, and the solubility parameter of the carbon dioxide is determined; the absolute value of the difference of the solubility parameter of the petroleum and the solubility parameter of the carbon dioxide is determined; if the error of the absolute value of the difference and the preset threshold value is smaller than the preset error value, the trial pressure value serves as the minimum petroleum reservoir carbon dioxide miscible flooding pressure; and if the error is larger than or equal to the preset error value, the trial pressure value is adjusted, the updated trial pressure value is formed, the current trial pressure value and the density of the carbon dioxide at the petroleum reservoir temperature are re-determined, and the solubility parameter of the carbon dioxide is re-determined till the error is smaller than the preset error value.
Owner:PETROCHINA CO LTD
Experimental device for ultrasonically promoting gas in CO2 (Carbon Dioxide) drive produced liquid to desorb
InactiveCN104697888AChange frequency continuouslyContinuously changing powerMaterial analysisCo2 floodingData acquisition
The invention discloses an experimental device for ultrasonically promoting gas in CO2 (Carbon Dioxide) drive produced liquid to desorb. The device comprises a high pressure gas tank which is connected with a visual solution absorbing reaction kettle connected with data acquisition recording equipment, and the bottom of the visual solution absorbing reaction kettle is connected with an ultrasonic generating system. According to the device, the de-compressive desorbing process of the CO2 drive produced liquid in a separator can be simulated in the presence of ultrasonic waves, an initial condition and a terminating condition of the experiment are likely to be controlled, the repeatability of experiment is good, the data measurement record is accurate, the combination of ultrasonic frequencies and power can be diversified, and the desorbing phenomenon is visual, therefore the dissolving characteristics, desorbing characteristics and the ultrasonic reinforced desorbing function of the CO2 in the drive produced liquid can be beneficially and deeply studied.
Owner:CHINA UNIV OF PETROLEUM (BEIJING)
Carbon dioxide foam generating device for carbon dioxide drive
InactiveCN110449050AStir wellPrevent liquefactionMixing methodsTransportation and packagingMicrocomputerCo2 flooding
The invention discloses a carbon dioxide foam generating device for carbon dioxide drive. The carbon dioxide foam generating device comprises a carbon dioxide tank, a gas guide pipe, a check valve, afoam generating box, a foam generating liquid tank, a foam guide pipe, a first rotating rod, a first motor, a second rotating rod, a gas inlet pipe, a second turbine, an installing box, a single gear,an electric control valve, an exhaust pipe, a second motor, an annular heat conduction plate, an annular heating box, a second stirring blade, a shaft rod, a first turbine, a connecting rod, a refrigeration sheet, an annular rotating plate, a gear ring, a single-chip microcomputer, a control panel, a first stirring blade and a temperature sensor. Carbon dioxide foam can be better stirred when conveyed and is prevented from being liquefied, and therefore the foaming efficiency of the carbon dioxide foam is greatly improved; the temperature of the carbon dioxide foam can be better adjusted, thefoam quality is prevented from being influenced by the too high temperature difference, the carbon dioxide drive efficiency is greatly improved, and meanwhile practicability is enhanced.
Owner:CHINA UNIV OF PETROLEUM (EAST CHINA)
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