64results about How to "Enhanced Oil Recovery" patented technology

An electrical current generating system is disclosed that includes a fuel cell operating at a temperature of at least about 250° C. (for example, a molten carbonate fuel cell or a solid oxide fuel cell), a hydrogen gas separation system or oxygen gas delivery system that includes a compressor or pump, and a drive system for the compressor or pump that includes means for recovering energy from at least one of the hydrogen gas separation system, oxygen gas delivery system, or heat of the fuel cell. The drive system could be a gas turbine system. The hydrogen gas separation system or the oxygen gas delivery system may include a pressure swing adsorption module.

A foam drive method for enhancing oil recovery efficiently is initiated by injecting into a subterranean oil-bearing formation, an aqueous polymer solution as a preceding-slug. This is followed by periodically injecting simultaneously or alternately a non-condensible gas and an aqueous solution of foaming composition to form a combined foam under ground or periodically injecting the combined foam formed beforehand by the gas and said aqueous solution above ground. The aqueous solution of foaming composition comprises an alkali, a surfactant and a polymer. Thereafter, an aqueous polymer solution used as a protecting-slug is injected into the formation; followed by continuing water-flooding.

The invention relates to polymer microspheres for in-depth reservoir oil displacement and profile control and a preparation method thereof. In the method, based on the method that photopolymerization is used to prepare the polymer, water-soluble anionic monomer is used and acrylamide monomer water solution, dispersant and crosslinking agent are added to form oil-water mixed emulsion in the mixed medium of surfactant and solvent, then initiator is decomposed by ultraviolet through photopolymerization under controllable temperature so as to initiate emulsion polymerization and 50-500nm of microspheres are formed. The polymer microspheres material prepared by the invention can be used in various environmental conditions and is characterized of safe and stable reaction system, simple and convenient operation, flexible and controllable reaction process and time, high production efficiency, low energy consumption, non-pollution and the like. The invention utilizes the ability of microspheres that microspheres can be dispersed in arbitrary concentration and injected in the water and can gradually swell after entering in depth of the formation to plug the pore throat so as to effectively plug the high permeable strip of the formation, expand the water swept volume and significantly increase crude oil recovery of water flooding reservoir.

The invention relates to synthesis of polyoxyethylene fatty alcohol ether sulphonate, and complex formulation for tertiary oil recovery displacement agent, and belongs to chemical displacement agent technic field. The invention discloses a synthesis method of a surface active agent for tertiary oil recovery for a high-temperature, high salinity and high calcium and magnesium ion oil reservoir, and complex formulation for highly effective displacement agents. Polyoxyethylene fatty alcohol ether sulphate is reacted with a sulfonating agent under the action of catalyst to produce polyoxyethylene fatty alcohol ether sulphonate. Polyoxyethylene fatty alcohol ether sulphonate are used as main material which is complex formulated with heavy alkyl benzene sulfonate, water, polymerisate, etc. Compared with existing products, the displacement agent of the invention in the three-high system reduces the oil-water boundary tension ultra-low (10<-3>mN / m), and the boundary tension is not affected by temperature, degree of mineralization and the concentration of calcium and magnesium ions.

An aqueous fluid useful for the recovery of crude oil from a subterranean formation, including water and one or more organophosphorus materials and methods for using same.

The invention discloses a surfactant compounded system with ultralow interfacial tension and a preparation method of the surfactant compounded system, belonging to the technical field of surfactants. The surfactant compounded system comprises the following components in percentage by mass: 10-33% of a primary surfactant, 7-23% of a synergist, 1-4% of a stabilizer and the balance of water, wherein the primary surfactant is an ampholytic surfactant, the synergist is a nonionic surfactant, and the stabilizer is an anionic surfactant. By using a small amount of the surfactant compounded system with ultralow interfacial tension, the oil-water interfacial tension reaches an order of magnitude of 10<-4>mN / m or lower within a short time; the surfactant compounded system with ultralow interfacial tension is applicable to tertiary oil recovery of a low-permeability or ultralow-permeability reservoir stratum so as to enhance oil recovery; the surfactant compounded system with ultralow interfacial tension also can be used for decompression and augmented injection of a water wall and viscosity reduction of thickened oil; the system is alkali-free and does not damage the stratum when used; the surfactant compounded system with ultralow interfacial tension can be used in industries such as a cleaning agent, an emulgator and a deinking agent; the raw materials are easily available and the system is low in price, good in performance and suitable for industrial production.

The invention relates to alkylphenol sulfonic polyoxyethylene aether sodium sulfovinate and the preparation method thereof, mainly aiming at solving the problems that current oil displacement agent containing surfactant is poor in oil displacement efficiency under high temperature with the existence of high salt and that the oil displacement agent contains alkali and causes damages to the stratum and the oil field and erodes the equipment and the pipes, which results in high production cost. The invention adopts alkylphenol sulfonic polyoxyethylene aether sodium sulfovinate with general molecular formula (I)to solve the problem; wherein M is alkali metal, ammonium group or amidocyanogen; R is alkyl from C1-C22; n is any integer from 1 to 30. The alkylphenol sulfonic polyoxyethylene aether sodium sulfovinate can be applied to the production of tertiary oil recovery in oil fields.

A functional polymeric surfactant reinforced combination flooding composition contains the following ingredients, by weight, 0.05-0.5% of polymer, 0.03-0.5% of a sulfonate surfactant, 0.01-0.3% of a functional polymeric surfactant, 0.0-0.3% of a nonionic surfactant, 0.2-1.5% of alkali and the balance water. The functional polymeric surfactant is a copolymer of an acrylamide monomer and / or a hydrophilic monomer and / or a functional monomer. According to the reinforced combination flooding composition, multiple oil-displacement mechanisms are combined. In a low-concentration system, the purpose that a three-compounds combination flooding has higher crude oil recovery can be achieved. After polymer flooding, oil reservoir also has a certain effect of raising crude oil recovery.

The invention discloses a binary composite oil dispelling system and an optimization method thereof. The oil dispelling system is prepared by compounding polymer and a surfactant; the polymer is partly-hydrolyzed polyacrylamide, the surfactant is one or two of anionic surfactant (petroleum sulfonate) and anionic-non-ionic surfactant, and the oil dispelling system is applied to chemical oil dispelling of heterogeneous oil reservoir. By adjusting the interface tension of the binary composite system of polymer and surfactant, the oil yield of middle / high permeability oil reservoir can be prominently increased, the provided optimization method is especially suitable for efficient chemical oil dispelling of middle / high permeability heterogeneous oil reservoir, the reagent cost is effectively reduced, and the risk of chemical oil dispelling is avoided.

The invention discloses a method for determining polymer flooding viscosity ratio. According to the method, a polymer flooding principle is used, mathematical models such as a fractional flow equation and a frontal displacement equation are established in an oil displacement process, a five-spot well pattern geometric model is established by a stream-tube method, conformance efficiencies under different viscosity ratio conditions are obtained, thereby, a relation curve among the viscosity ratio, the conformance efficiencies and oil displacement efficiency can be obtained, and a set of obtained methods for accurate limit of reasonable viscosity ratio in a polymer flooding process on basis of a fractional flow principle is formed. Compared with methods in the prior art, the method for determining the polymer flooding viscosity ratio has the advantages that input costs of polymers are greatly reduced, the crude oil recovery ratio is effectively increased, and economic benefits and social benefits are extremely large.

An aluminium citrate type additive for recovering petroleum has the formula of M0-2Al1-3C6H4-10O7N1-4X0.1-9, and is prepared through reaction of Al-containing aqueous solution with the aqueous solution containing radical of citric acid, adding alkaline substance or putting in ionic exchange resin for stabilizing and regulating pH value. Its advantages are high content of Al, excellent performanceand high stability.

The subject invention provides systems and apparatuses for producing microbe-based compositions that can be used in the oil and gas industry, environmental cleanup, as well as for other applications. More specifically, the present invention includes biological reactors, equipment, and materials for fermenting microbe-based compositions.

Disclosed are methods for improving the production of heavy / viscous crude oil from subterranean formations comprising secondary production through use of a displacement fluid (typically a waterflood) wherein the subterranean formation is subjected to cyclic periods of overinjection of the displacement fluid followed by underinjection of the displacement fluid, but keeping the overall cumulative voidage replacement ratio (VRR) within a defined range, typically targeted to be about 1. In some aspects, the initial production of such heavy / viscous crude oil is limited, if possible, followed this cyclic secondary production methodology. By keeping the initial production, VRR, and cumulative VRR in defined ranges, the expected ultimate recovery (EUR) can be optimized, and overall production increased for example by as much as 100% or more relative to conventional production methods.

The present invention relates to a method of obtaining and using foaming compositions with wettability-modifying and corrosion inhibitory properties that control the channeling of fluids in naturally fractured carbonate reservoirs, favorably alter the rock wettability in crude oil enhanced recovery processes and control uniform corrosion problems occurring in production rigs under high temperature and ultra-high salinity conditions by the synergistic effect resulting from the supramolecular interaction of alkyl amido propyl hydroxysultaines or alkyl hydroxysultaines with sodium alkyl hydroxysulfonates and sodium alkenyl sulfonates having the formula (1). The foaming compositions with wettability-modifying and corrosion inhibitory properties are tolerant to high concentrations of divalent ions such as calcium, magnesium, strontium and barium and are suitable for use in the reservoir, seawater and / or congenital water characteristic of the reservoir for transporting the crude oil from the reservoir.

The invention provides a preparation method of a micro emulsion polymer for displacement control of an oil deposit deep part with high temperature and mineralization. The preparation method comprises the following steps of: on the basis of preparing the micro emulsion polymer by adopting a photopolymerication, adding 3-acrylamide group-3-methyl sodium butyrate, 2-acrylamide group-2-methyl propanesulfonic acid and other temperature-resistant salt-resisting materials and water-soluble anion monomers into a water solution containing acrylamide monomers; adding a dispersion agent; forming a water-oil mixed emulsion in a mixed medium of a surfactant and a solvent; and decomposing an initiator to initiate the emulsion for polymerizing to form the micro emulsion polymer by using a photopolymerication mode under the action of controllable temperature. By utilizing the capability of the micro emulsion polymer dispersed into injected water at any concentration, entering a stratum deep part and forming jelly under the action of the cross linking to block a pore throat to effectively block a high-permeation stripe of the stratum, the invention enlarges the swept volume of water, remarkably improves the crude oil recovery ratio for developing the oil deposit driven by water, and is applied to deep part profile control of the oil deposit with high temperature and mineralization.

The invention provides a high-temperature high-pressure shaft simulator comprising a circulating mechanism, a temperature and pressure control mechanism, and a data measuring and acquiring mechanism. The circulating mechanism comprises a reciprocating circulating pump, a circulating oil pipe and a sample distributor-converter; the reciprocating circulating pump is connected with inlet and outlet ends of the circulating oil pipe; the sample distributor-converter is connected with the inlet end of the circulating oil pipe; the circulating oil pipe has an ascent segment and a descent segment connected through a transitional segment; the temperature and pressure control mechanism comprises an oil bath circulating sleeve, an oil bath thermostat and a pressure regulating pump; the oil bath circulating sleeve sleeves the circulating oil pipe and is connected with the oil batch thermostat; the pressure regulating pump is connected with the sample distributor-converter; the data measuring and acquiring mechanism comprises a plurality of sensors connected to the circulating oil pipe. The high-temperature high-pressure shaft simulator has the advantages that a high-temperature high-pressure underground environment and flowing of produced fluid in a shaft during production can be simulated, the influence of different production conditions upon frictional resistance and flowing form during crude oil lifting is studied through real-time monitoring, and the simulator is of promising engineering application value and academic value.

Nanohybrid preparation methods and compositions, and their usage as oil / water emulsion stabilizers for Chemical Enhanced Oil Recovery (C-EOR). These methods have two main steps: (a) MWCNTs modification; and (b) encapsulation and insertion techniques to insert inorganic nanoparticles into the modified MWCNTs structure. The so-prepared nanohybrids used for the preparation of nanofluids were found to decrease the oil surface tension and reservoir wettability modification from oil-wet to water-wet, which is useful for Chemical Enhanced Oil Recovery (C-EOR).

The invention discloses a block copolymer emulsification enhancement combination flooding composition and an application thereof. The combination flooding composition comprises the following components in percentage by weight: 0.01%-0.5% of polyoxyethylene-polyoxypropylene-polyoxyethylene triblock copolymer, 0.0%-0.5% of a nonionic surfactant, 0.05%-0.5% of polymer, 0.03%-0.5% of a sulfonate surfactant, 0.2%-1.5% of alkali and the balance of water. According to the combination flooding composition, the emulsification performance of polymer-surfactant-alkali three-compound combination flooding is enhanced, the purpose of relatively high oil recovery rate in comparison with that of three-compound combination flooding can be achieved, and an oil reservoir after polymer flooding also has a certain effect of increasing the oil recovery rate.

The invention discloses a method for producing oil by changing a bottom water reservoir oil well into a water dumping well and an oil production well system. In the oil production method, a well is digged on a strong bottom water reservoir; the depletion development is carried out; and when bottom water is broken through to the oil well, an oil layer and a water layer below the oil layer are drilled out to guide the bottom water to the oil layer to carry out oil displacement, so that crude oil is produced from other wells. According to the invention, the oil well which is seriously flooded is subjected to secondary well drilling, the oil layer is communicated with the water layer, the bottom water energy is sufficiently utilized, the bottom water is guided into the oil layer to carry out oil displacement and the crude oil is produced from the adjacent wells. The invention not only solves the problems caused by a water cone, but also sufficiently utilizes the natural energy of the bottom water, guides the bottom water to the oil layer to displace the crude oil and improves the recovery ratio of the crude oil.

The invention discloses complex heavy oil reservoir oil solubility foaming agent intensified mixed gas huff-puff experimental equipment. The mixed gas is natural gas and propane which have better dissolution and viscosity-breaking effects compared with the natural gas, CO2 or CH4 and other single light component gas, the propane gas can be effectively prevented from liquefaction, so that the propane gas consumption can be reduced, and the propane gas use cost is reduced. In addition, an oil solubility foaming agent is matched with the mixed gas to generate artificial foam oil to reduce the speed of gas output during the huff-puff period, and the heavy oil viscosity can be reduced, so that the problem that the recovery efficiency of existing complex heavy oil reservoir is not high can be solved.

The invention relates to a micro-emulsion polymer for in-depth profile control and oil displacement of reservoirs and a preparation method thereof. On the basis of a method for preparing a polymer by adopting a photopolymerization reaction, water-solubility anion monomers are added into aqueous solution containing acrylamide monomers, a dispersing agent and a cross-linking agent are added, an oil-water mixed emulsion is formed in a mixed medium of a surfactant and a solvent, and after an imitating agent is decomposed by ultraviolet light in a mode of photopolymerization reaction at the controlled temperature, the emulsion polymerization is initiated so as to form the micro-emulsion polymer. The micro-emulsion polymer prepared by the invention is suitable for reactions under the condition of multiple environments, and has the characteristics of safe and stable reaction systems, simple, easy and convenient operation, flexible adjustment of reaction process and reaction time, high production efficiency, low energy consumption, no pollution and the like. The micro-emulsion polymer of the invention can be dispersed into injection water at any concentration and can enter deep strata to form gel under the action of the cross-linking agent, so that the capability of blocking pore throats is formed gradually, high-permeability stripes of the strata are blocked effectively, the swept volume of the water is enlarged, and the crude recovery ratio of developing the reservoirs through water flooding is improved obviously.

A foaming composition with wettability-modifying and corrosion inhibitory properties is used to control the channeling of fluids in naturally fractured carbonate reservoirs, favorably alter the rock wettability in crude oil enhanced recovery processes and control uniform corrosion problems occurring in production rigs under high temperature and ultra-high salinity conditions by the synergistic effect resulting from the supramolecular interaction of alkyl amido propyl hydroxysultaines or alkyl hydroxysultaines with sodium alkyl hydroxysulfonates and sodium alkenyl sulfonates having the formula (1). The foaming compositions with wettability-modifying and corrosion inhibitory properties are tolerant to high concentrations of divalent ions such as calcium, magnesium, strontium and barium and are suitable for use in the reservoir, seawater and / or congenital water characteristic of the reservoir for transporting the crude oil from the reservoir.

The invention relates to a method for improving a crude oil recovery ratio in a dolomite reservoir by using microbial flora, wherein the microbial flora include pseudomonas aeruginosa, bacillus cereus, bacillus subtilis, microbacterium sp., escherichia coli, pseudomonas putida and bacillus licheniformis; the microbial flora are compounded according to the ratio, and through expansion culture and fermentation culture, a fermentation liquid of the microbial flora is prepared; the fermentation liquid is mixed with injected water, a nutrient solution is added into the mixed solution, the mixed solution is injected into a dolomite reservoir core, and after the injected microbial flora act on the dolomite reservoir core, crude oil recovery is performed. The microbial flora can increase the core pore diameter, length and porosity, and lowers the crude oil viscosity and oil-water interfacial tension, so as to improve the crude oil recovery ratio of the dolomite reservoir; moreover, the method has the advantages of simple fermentation process, low cost, simple operation, and high input / output ratio, is suitable for large-scale industrial production, and has good application prospects.

The invention provides a high-temperature-resistant gene engineering bacterium for producing an extracellular water-insoluble polysaccharide and application thereof, which relates to the application of a biological engineering technology to microbial enhanced oil recovery. The gene engineering bacterium is a high-temperature-resistant gene engineering bacterium for producing an extracellular water-insoluble polysaccharide and has the collection number of CGMCC No.3909; a recipient strain of the gene engineering bacterium is a JD bacterium (Enterobacter sp.), which is not resistant to high temperature and can produce the extracellular water-insoluble polysaccharide at the temperature of 37 DEG C; and a donor bacterium of the gene engineering bacterium is a GW (Geobacillus kaustophilus) bacterium of a thermophile bacterium. Genome DNA (Deoxyribonucleic Acid) of the GW bacterium is transferred into the JD bacterium by adopting an electric shock transformation method, so that a gene engineering bacterium which can produce the extracellular water-insoluble polysaccharide at the high temperature of over 50 DEG C is obtained. The gene engineering bacterium can be applied to profile control of higher temperature oil reservoirs. The aim of increasing the crude oil recovery ratio can be fulfilled by selectively plugging a high-permeability zone. The invention also provides an effective method for expanding the application range of a bacterial strain applied to microbial enhanced oil recovery.

The invention discloses a magnetic injection increase and depressurization test system which comprises a flow device, a drive device, a buffer device, a magnetic processing device and a constant temperature device, wherein the flow device is used for placing a test rock core and supplying ring crush to the test rock core; the drive device is used for supplying different displacement pressures or liquid flow rates to the test rock core; the buffer device is used for storing water for test, and the drive device drives the water for test to the rock core; the magnetic processing device is used for supplying different magnetic field strengths to the test rock core; the constant temperature device is used for supplying constant temperature to the test rock core; the drive device sets the displacement pressure or the liquid flow rate and drives the water for test in the buffer device to flow through the magnetic processing device, and then the water for test is pressed to the test rock core in the flow device; and the constant temperature device supplies constant temperature to the buffer device, the magnetic processing device and the flow device. With adoption of the embodiment of the invention, the rock core permeability and pressure gradient under different magnetic field strengths and different temperatures can be conveniently, rapidly and accurately measured; and the magnetic injection increase and depressurization test system can be used for researching a low permeation oil reservoir magnetic injection increase and depressurization mechanism, guiding oilfield field application and enhancing oil recovery factor.

The invention discloses pseudomonas aeruginosa and particularly discloses pseudomonas aeruginosa Gx preserved in CGMCC (China General Microbiological Culture Collection Center) with the preservation number of CGMCC NO. M2016790 on December 30th 2016. The invention also discloses applications of the pseudomonas aeruginosa Gx to asphalt degradation and transformation, colloid degradation and transformation and microbial enhanced oil recovery. The pseudomonas aeruginosa Gx disclosed by the invention has a strong degradation ability on colloid and unknown macromolecule components in asphalt and crude oil, strong surface active material synthesizing ability and acid producing ability and large oil displacing potential in the microbial enhanced oil recovery of high-asphalt content heavy oil reservoirs; and therefore, the pseudomonas aeruginosa Gx is capable of remarkably reducing the adhesion of the crude oil and increasing the gasoline and diesel oil yield in crude oil refining.

The invention provides a segmented acid fracturing water controlling production increasing method for a carbonate rock fractured-vuggy reservoir deep open hole horizontal well, and belongs to the technical field of well completion of oil-gas wells. The segmented acid fracturing water controlling production increasing method comprises the steps: the number of segments of horizontal well segmented acid fracturing is determined; according to the number of the segments, the horizontal well is subjected to segmented perforation acid fracturing; and all the segments subjected to segmented perforation acid fracturing are subjected to water controlling production. Determination of the number of the segments, overall perforation, segmented fracturing and segmented water controlling are realized, the cost-benefit ratio is optimized, the oil recovery degree of a horizontal well control area is increased, the oil production of the carbonate rock fractured-vuggy reservoir deep open hole horizontalwell is overall increased, the input-output ratio of segmented acid fracturing of the deep open hole horizontal well is increased, oil producing and water controlling are facilitated, and applicationprospects are wide.

The invention relates to an amphoteric crosslinked polymer coil and a preparation method thereof. The method comprises the following steps: dissolving anionic monomer, cationic monomer, nonionic monomer and cross-linking monomer in water according to the mole ratios of them being 2.5-25:2.5-25:50-95:0.1-6 to prepare a water phase with the total mass fraction of 2.0%-60%, dissolving a dispersing agent in a base oil to prepare an oil phase with the content of 1.0%-50.0%; mixing the two phases to obtain a suspension dispersion, wherein the total mass fraction of the anionic monomer, cationic monomer and nonionic monomer in the dispersion are controlled to be 10.0%-40.0%, the mass fraction of the cross-linking monomer is 0.001%-2.0%, and the mass fraction of the dispersing agent is 1.0%-15.0%; in the inert environment, carrying out polymerization reaction to obtain the amphoteric crosslinked polymer coil. The amphoteric crosslinked polymer coil is particularly suitable for higher permeability oil reservoirs or medium and low permeability oil reservoirs with relatively high permeability strips and the recovery rate of crude oil can be improved.

The invention provides an oil extraction method utilizing circulated heating cavity gases. The method includes heating oil layer cavity gas which enters into a heating device, and extracting oil after injecting heated cavity gases into an oil layer. In this method, flue gas generated by the heating device is injected into the oil layer, and some cavity gases enter into the heating device to serve as fuel for the heating device to form a circulated heating system. By utilizing the method, the oil extraction cost is low, no water resource is needed, contaminated water processing cost is reduced, the pressure and temperature are adjustable, the oil-gas ratio of oil extraction is high, and the yield is high.