136 results about "Polymer flood" patented technology

The invention relates to the technical field of reservoir numerical simulation, and discloses a polymer flooding reservoir rapid simulation optimization method considering sedimentary facies constraints, which comprises the following steps: identifying sedimentary facies boundaries according to distribution characteristics of sedimentary facies, and establishing a connected network model considering the sedimentary facies constraints on the basis of the sedimentary facies boundaries, well positions and various sedimentary facies attributes; carrying out one-dimensional grid division on the connected network model, converting the connected network model into a grid connection format of a universal simulator, and solving the connected network model by adopting the universal simulator to obtain pressure and saturation solutions; establishing an automatic historical fitting mathematical model based on sedimentary facies and oil reservoir constraint conditions; the economic net present value is used as an index, the water injection rate, the liquid production rate and the polymer injection rate of each well are used as optimization variables, the differential evolution algorithm is used, the total polymer injection amount and the oil reservoir pressure are restrained, and an oil reservoir injection and production optimization mathematical model is established. According to the method, the oil reservoir is optimized by comprehensively considering the characteristics of the oil reservoir after water flooding is converted into polymer flooding, so that rapid decision-making of the oil field and guidance of oil field construction are realized.

The invention discloses an oil reservoir polymer flooding process oil-water distribution simulation method and device based on a cellular automaton, equipment, a medium and a product, and relates to the field of oil reservoir engineering and seepage mechanics. The method comprises the steps that rectangular grid division is conducted on an oil reservoir space, three-dimensional coordinates of cellular nodes are determined, and a cellular automaton model is constructed; according to the polymer oil displacement scheme parameters, oil reservoir state parameters at the end moment of water displacement are initialized, and boundary conditions of the mole-type cellular automaton model are established; making an evolution rule for each neighborhood cellular node in the Moire cellular automaton model; according to a numerical value stability rule, adjusting parameters of each neighborhood cellular node in the Mohr-type cellular automaton model; according to the method, a relative permeability nonlinear regulation and control rule is formulated for the Mohr-type cellular automaton model to simulate oil-water distribution in the oil reservoir polymer flooding process of the Mohr-type cellular automaton model, the starting pressure gradient is accurately simulated, and the low-permeability oil reservoir evolution process is accurately described.

The invention relates to a double-tailed hydrophobic associated polymer oil-displacing agent with a benzene ring structure and a preparation method thereof. The oil-displacing agent is formed by copolymerizing three monomers, namely acrylamide, 2-allyl methylamino sodium ethanesulfonate and a hydrophobic monomer double-tailed long-chain alkyl methyl (p-3-carboxyl acrylamide benzyl) ammonium chloride with the benzene ring structure. The preparation method comprises the following steps: firstly adding distilled water, then adding acrylamide, 2-allyl methylamino sodium ethanesulfonate and a hydrophobic monomer double-tailed long-chain alkyl methyl (p-3-carboxyl acrylamide benzyl) ammonium chloride with a benzene ring structure, supplementing water, adjusting the total concentration, introducing N2 to remove oxygen, adding an initiator, and reacting at a certain temperature to prepare the terpolymer. The prepared polymer oil-displacing agent has good water solubility, temperature resistance and shearing resistance, shows good salt resistance in saline water with the mineralization degree larger than or equal to 30000 mg / L and shows a good oil-displacing effect in a heterogeneous core oil-displacing experiment, and the crude oil recovery rate can be increased by 10% or above.

The invention relates to a bisulfonate hydrophobic association polymer oil-displacing agent with a benzene ring structure and a preparation method thereof. The polymer oil-displacing agent is formed by copolymerization of three monomers, namely acrylamide, sodium 2-allyl methylamino ethanesulfonate and long-chain alkyl disulfoethyl (4-vinyl benzyl) betaine which is a hydrophobic monomer with the benzene ring structure. The preparation method comprises the following steps: firstly adding distilled water, sequentially adding acrylamide, 2-allylmethylamino sodium ethanesulfonate and long-chain alkyl disulfoethyl (4-vinyl benzyl) betaine, adding water to adjust the total concentration, introducing N2 to remove oxygen, adding an initiator, and reacting at a certain temperature to obtain the terpolymer. The polymer oil-displacing agent prepared by the invention has good water solubility and good temperature resistance and shear resistance, shows good salt resistance in saline water with the degree of mineralization being greater than or equal to 30000 mg / L, shows a good oil-displacing effect in heterogeneous rock cores, and can improve the crude oil recovery rate by 10% or above.

The invention provides a polymer flooding reservoir model prediction method and device, equipment and a storage medium. Relates to the field of oil-gas field development engineering. The method comprises the steps that an injection-production system matrix is converted into a multi-channel field graph containing time codes, and a depth operator network is constructed in combination with three-dimensional physical field data output through reservoir numerical simulation; a branch network adopts a residual attention network to convert the injection-production system field graph into a parameter-dependent feature graph; the backbone network converts tensors of time coding into spatial modulation weights, and initial operators of a pressure field, an oil saturation field and a polymer concentration field are generated through dot product operation; dynamically enhancing the data density of the high-error region by using an adaptive sampling mechanism based on a Gaussian mixture model; and realizing transient multi-physics field synchronization high-precision prediction by combining geometric similarity matching multiplexing physical tags. The problems that a traditional numerical simulator is low in calculation efficiency and a conventional agent model is poor in generalization ability are solved.

The invention relates to a bisulfonate hydrophobic associated polymer oil-displacing agent with a cyclic structure and a preparation method thereof. The oil-displacing agent is formed by copolymerization of four monomers, namely acrylamide, sodium 2-allyl methylamino ethanesulfonate, diallyl disulfoethyl betaine and long-chain alkyl dimethyl (p-3-carboxyl acrylamide benzyl) ammonium chloride which is a hydrophobic monomer with a benzene ring structure. The preparation method comprises the following steps: firstly, adding distilled water, then sequentially adding acrylamide, 2-allyl methylamino sodium ethanesulfonate, diallyl disulfoethyl betaine and a hydrophobic monomer long-chain alkyl dimethyl (p-3-carboxyl acrylamide benzyl) ammonium chloride with a benzene ring structure, supplementing water, adjusting the total concentration, introducing N2 to remove oxygen, adding an initiator, and stirring to obtain the water-absorbent polymer. And reacting at a certain temperature to obtain the quadripolymer. The prepared oil-displacing agent has good water solubility, temperature resistance and shearing resistance, shows good salt resistance in saline water with the mineralization degree larger than or equal to 30000 mg / L, shows a good oil-displacing effect in heterogeneous rock cores, and can improve the crude oil recovery rate by 10% or above.

The invention belongs to the field of oil production engineering, and discloses a method for analyzing the sand-carrying capacity of a chemical flooding oil well, which comprises the following steps of: on the basis of calculating the viscosity of formation fluid in different stages of a polymer flooding production well, establishing a sand production quantity model of an oil well for producing liquid with the viscosity and a critical sand-carrying particle size model under the output liquid quantity; and judging whether the oil well has sand-carrying capacity or not through sand particle size analysis, sand content calculation and sand burying time of the pump cylinder. The method has high field applicability, can predict whether the chemical flooding production well can carry sand to produce oil or not in advance in the oil reservoir deployment stage, clearly determines which sand prevention and sand carrying lifting process mode is adopted, provides theoretical guidance for oil production engineering block scheme design, and improves the oil production efficiency. And meanwhile, technical support is provided for adjustment of a single-well sand prevention and sand carrying lifting process in different production and polymer concentration stages of the converted chemical flooding production well.

The invention relates to the field of oil exploitation, discloses a high-temperature-resistant and high-salt-resistant polymer oil-displacing agent for oil exploitation, and discloses a preparation method of the high-temperature-resistant and high-salt-resistant polymer oil-displacing agent for oil exploitation, and the high-temperature-resistant and high-salt-resistant polymer oil-displacing agent for oil exploitation comprises the following components in percentage by weight: 5-15% of N-aryl acrylamide and 40-60% of 2-acrylamido-2-methylpropanesulfonic acid. Comprising the following steps: S1, dissolving N-aryl acrylamide, 2-acrylamido-2-methylpropanesulfonic acid, dodecyl acrylamide, acrylic acid and methacryloyloxyethyl trimethyl ammonium chloride into deionized water according to the weight percentage, and uniformly stirring. Through collaborative design of the dynamic cross-linking agent and the functional monomer, the polymer oil-displacing agent with high-temperature and high-salt adaptability is constructed, the polymer oil-displacing agent has excellent thermal stability, salt resistance and shear recovery capability, the problem of insufficient performance under extreme oil reservoir conditions in the prior art is effectively solved, and an efficient oil-displacing effect is achieved.

The invention relates to a man-machine interaction manipulator based on a shape memory polymer driver and application of the man-machine interaction manipulator. The man-machine interaction manipulator comprises a bionic manipulator body, the shape memory polymer driver, a controller, a power supply device and a sensor. The bionic manipulator comprises a palm and fingers composed of phalanges. The phalanges are connected through shape memory polymer drivers, and the palm and the fingers are connected through shape memory polymer drivers; the shape memory polymer driver and the sensor are respectively connected with the controller; the controller is connected with the power supply device; the sensor is attached to the back of the hand of an operator, and when the operator moves the hand, a voltage signal generated by the sensor is sent to the controller; the bionic mechanical arm is attached to the back of the hand of a manipulated person, and the controller is used for conducting thermal driving control on the shape memory polymer driver when receiving the voltage signal so as to achieve movement of the bionic mechanical arm. The man-machine interaction manipulator is simple in structure, light in weight, good in comfort and high in man-machine interaction safety.

The invention relates to the technical field of light flexible drivers and intelligent macromolecules, in particular to a preparation method of a polymer driver for improving bidirectional shape memory driving performance, which comprises the following steps: 1) preparing a polyethylene vinyl acetate-sodium chloride particle-xylene-benzoyl peroxide mixed solution by a solution polymerization method; 2) preparing a polyethylene vinyl acetate-sodium chloride particle-benzoyl peroxide composite material; (3) peroxide thermally initiates a cross-linking reaction between free radicals and a macromolecular main chain; and 4) preparing the bidirectional shape memory porous polymer soft body driver with different driving devices.The bidirectional shape memory porous polymer soft body driver has the advantages that the self-driven reciprocating deformation, large driving deformation and complex shape change of the polymer are realized on the basis of semi-crystalline polymer thermal coupling through the change of a cross-linked network interspersed in a crystal interval, and the bidirectional reversible driving performance is further improved.

This invention discloses a demulsifier for polymer flooding crude oil produced fluids, its preparation method, and its application, belonging to the field of chemical additives for petrochemicals. The technical solution includes a main agent, an auxiliary agent, a penetrant, and water; the main agent is a polyene-polyamine block polyether, the auxiliary agent is a triethanolamine block polyether quaternary ammonium salt, and the penetrant is selected from at least one of methanol, ethanol, ethylene glycol, and diethylene glycol butyl ether; in the demulsifier, the ratio of the main agent to the auxiliary agent is 4-9:1, the amount of penetrant is 30% of the total amount of the main agent and auxiliary agent, and the amount of water is 70% of the total amount of the main agent and auxiliary agent. This invention, applied to demulsification of polymer flooding crude oil produced fluids, features high demulsification efficiency and rapid demulsification effect.

The application provides a device and method for simulating low-efficiency water drive thick oil viscosity reduction composite drive enhanced oil recovery, which comprises an injection system, a three-dimensional large-size sand filling model, a multi-well back pressure measurement and control system and a multi-well flow metering system. The injection system is connected to the three-dimensional large-size sand filling model, and fluid is injected into the three-dimensional large-size sand filling model which can simulate well pattern mode. The multi-well back pressure measurement and control system is connected to the three-dimensional large-size sand filling model, and the formation pressure is set. The multi-well flow metering system is connected to the three-dimensional large-size sand filling model, and the output fluid is metered. The device and method for simulating low-efficiency water drive thick oil viscosity reduction composite drive enhanced oil recovery can meet the enhanced oil recovery experiments of water drive, polymer drive, viscosity reduction drive, viscosity reduction composite drive and the like of three-dimensional large-scale heterogeneous reservoir models under different well pattern modes, and has important significance for the enhanced oil recovery of low-efficiency water drive thick oil reservoirs.

The invention discloses a polymer mother liquor device capable of accelerating curing speed, and belongs to the technical field of tertiary oil recovery. The device comprises a curing tank and multiple stages of stripping plates arranged in the tank, the stripping plates comprise a first stripping plate, a second stripping plate and a third stripping plate, and the curing tank is divided into a lower cavity, a middle lower cavity, a middle upper cavity and an upper cavity in the axial direction; through holes with different diameters are formed in the stripping plates, the diameters of the through holes in the upper layer are smaller than those of the through holes in the lower layer, and the stripping plates are used for graded stripping of polymer particles with different swelling degrees; a stirrer and a cleaner positioned above the stripping plate are arranged in the curing tank, so that blockage is prevented, and dissolution is promoted. Through multi-stage stripping and partition stirring, the device effectively increases the specific surface area of a polymer, accelerates dissolution, reduces fisheye generation, remarkably shortens the curing time, improves the solution uniformity, and is suitable for the mother liquor curing procedure in the polymer flooding oil extraction process.

The invention discloses a surface active nano polymer oil-displacing agent which comprises a water phase substance and an oil phase substance, and the mass ratio of the water phase substance to the oil phase substance is (0.61-0.93): 1. The water-phase substance comprises deionized water, acrylamide, acrylic acid, an active monomer, sodium p-styrenesulfonate, a pH regulator and an initiator A; the water-phase substance comprises 5 # white oil, sorbitan monooleate, a water-soluble active agent, lauryl alcohol polyoxyethylene ether and an initiator B; the invention also discloses a preparation method and application of the surface-active nano-polymer oil displacement agent, the prepared surface-active nano-polymer oil displacement agent is mixed with water to prepare a solution with the mass concentration of 0.1-0.5%, the solution is injected into a stratum, and after the solution enters an oil reservoir, bridging plugging is utilized and the oil washing efficiency is improved, so that the surface-active nano-polymer oil displacement agent is obtained. The purposes of improving the water flooding swept volume and improving the oil washing efficiency are achieved.

This invention belongs to the field of petrochemical new materials technology, specifically relating to a novel oil displacement agent and its preparation method. The novel oil displacement agent comprises the following raw materials in parts by weight: 3-7 parts of either acrylic acid or methacrylic acid, 20-30 parts of acrylamide, 1.1-2.3 parts of octadecyl acrylate, 10-21 parts of polymeric oil, 1-3 parts of emulsifier, 0.05-0.08 parts of initiator, and 1.7-2.4 parts of phase inverting agent. The oil displacement agent provided by this invention is suitable for 5-50 mD low-to-medium permeability reservoirs, does not cause pore throat blockage, can be mixed online without human intervention, effectively improves the oil-water mobility ratio, enhances oil washing efficiency, and significantly improves crude oil recovery. It is suitable for fracture network fracturing of continental sedimentary unconventional oil and gas reservoirs and the development of low-to-medium permeability reservoirs, solving the problems of difficult injection, easy blockage, and high cost of traditional polymer flooding.

The invention discloses a microcosmic numerical simulation method for pore-scale polymer oil displacement. The method comprises the following steps: obtaining basic data of polymer, oil, water viscosity, oil-polymer and oil-water interfacial tension; initializing partial content data of the basic data; the speed distribution of the polymer, oil and water in the pore space is obtained; adopting a polymer spatial distribution tracking model to obtain distribution of polymers in space; adopting an oil space distribution tracking model to obtain the distribution of oil in the space; obtaining an oil-water interface curvature and an oil-polymer interface curvature; solving the viscoelastic stress tensor of the polymer; and carrying out viscous component and elastic component decomposition on the solved viscoelastic stress, and repeating the steps. According to the method, the strategy of separating and dispersing the viscous component and the elastic component is introduced, the stability of the algorithm is improved, the high-stability numerical simulation method for pore-scale polymer oil displacement is provided, and efficient tracking of pore-scale flow in the polymer oil displacement process is achieved.

A method for establishing tracking and adjustment charts for injection and production wells during the recovery phase of polymer flooding in Class III oil reservoirs addresses the issue that existing polymer flooding tracking and adjustment technologies for Class I oil reservoirs are unsuitable for Class III reservoirs. The method includes establishing adjustment charts for injection and production wells. The injection well adjustment chart is established by using the injection well's fluid absorption thickness as the length of a rectangle (40-100 mm) and the maximum relative fluid absorption of a single layer as the width of a rectangle (0-100 mm). The chart is divided into four zones: a fracturing zone, a subdivision adjustment zone, a enrichment zone, and a rational zone. The production well adjustment chart is established by using the production well's stage of production as the length of a rectangle (0-35 mm) and the water cut as the width of a rectangle (60-100 mm). The chart also includes four zones: a fracturing zone, a rational zone, a enrichment zone, and a fracturing and water shut-off zone.

The invention relates to a polymer oil-displacing agent, and belongs to the technical field of oil and gas reservoir chemicals. The modifier in the polymer oil-displacing agent disclosed by the invention can be complexed with Ca < 2 + > and Mg < 2 + > in heavy salt water at normal temperature, so that the internal crosslinking influence of high salt on polyacrylamide polymer molecules is reduced, and meanwhile, the modifier and the polyacrylamide polymer can jointly accelerate ion diffusion and enhance activation energy, so that a chelating agent in the modifier can be quickly activated at normal temperature; the polymer oil-displacing agent provided by the invention has the advantages that polyvalent metal salt can enter polyacrylamide molecular lattices easily, intramolecular crosslinking can be quickly formed at normal temperature, the polymer oil-displacing agent can have higher viscosity under the condition of lower dosage, and the viscosity of the oil-displacing agent is increased along with the increase of the hydrolysis degree of the polyacrylamide polymer at the formation temperature. Therefore, the oil-displacing agent disclosed by the invention can realize normal-temperature crosslinking, has relatively high apparent viscosity in high-salinity water, and also has relatively high viscosity retention rate at high temperature, so that the use requirements of high-temperature and high-salinity oil and gas reservoirs are met.

The application discloses a preparation method of a flexible intelligent liquid crystal polymer driver and relates to the technical field of liquid crystal polymer materials, and comprises the following steps: step one, configuring a liquid crystal mixture: one or more liquid crystal polymer monomers and a photoinitiator are mixed, and after being heated and melted, the mixture is uniformly shaken and stirred to obtain the liquid crystal mixture; step two, preparing a liquid crystal box: a liquid crystal box with a main body 90-degree twist orientation and one end structured orientation is prepared; step three, preparing a long-strip liquid crystal polymer film driver; and step four, driving and optically regulating the long-strip liquid crystal polymer film driver; the liquid crystal polymer driver prepared by the method has optical microstructures, can be bent and deformed under thermal field stimulation, and can also be regulated for light beam deflection to generate self-driven, self-feedback and self-sustaining dynamic optical function effects.

The present invention relates to a polymer flooding agent, belonging to the technical field of oil and gas reservoir chemicals. The modifier in the polymer flooding agent of the present invention can complex Ca in high brine at room temperature. 2+ Mg 2+ , reducing the influence of high salt on the internal cross-linking of polyacrylamide polymer molecules, and at the same time, the polyacrylamide polymer can jointly accelerate ion diffusion and enhance activation energy. The chelating agent in the modifier can be quickly activated at room temperature, which is conducive to the entry of multivalent metal salts into the polyacrylamide molecular lattice and the rapid formation of intramolecular cross-linking at room temperature. The polymer oil-displacing agent of the present invention can have a high viscosity when used in a low dosage, and at formation temperature, as the degree of hydrolysis of the polyacrylamide polymer increases, the viscosity of the oil-displacing agent increases. Therefore, the oil-displacing agent of the present invention can achieve room temperature cross-linking and have a high apparent viscosity in high-salt water, while having a high viscosity retention rate at high temperature, thereby meeting the use requirements of high-temperature and high-salt oil and gas reservoirs.

The present application relates to a method for supercritical carbon dioxide-assisted polymer flooding. The method for supercritical carbon dioxide-assisted polymer flooding comprises the following steps: lowering a soluble bridge plug into a string, such that the soluble bridge plug is located between a high polymer-absorbing layer in the lower part of an oilfield and a low polymer-absorbing layer in the upper part of the oilfield; injecting an acidizing plugging remover to clean the low polymer-absorbing layer; and sequentially injecting a solubilization synergist, carbon dioxide, and a surfactant. The present application can greatly improve the vertical utilization degree of a reservoir and the oil displacement efficiency, and further improve the reservoir recovery factor.

The invention discloses a method for improving oil extraction speed through combination of fault block oil reservoir water drive encryption and polymer flooding, relates to the technical field of oil field development, and solves the problems of poor development effect and low oil extraction speed due to economic limitation of a long-well-section oil reservoir which can only adopt one set of well pattern. The method comprises the following steps: S1, preferably selecting an implementation block according to polymer flooding application conditions; s2, implementing block water flooding and polymer flooding collaborative well pattern reconstruction; s3, implementing block water-driven three-dimensional potential tapping; s4, performing an indoor physical model experiment, and screening polymer products suitable for implementation of blocks; s5, implementing block injection parameter optimization; and S6, block selective machine injection is implemented, and the comprehensive mining effect is improved. According to the method for improving the oil extraction speed by combining water drive and polymer drive of the fault block oil reservoir, the development thought that water drive and polymer drive are combined is adopted, after water drive encryption and well pattern reconstruction are conducted on the basis of meeting the polymer drive requirement, three-dimensional potential tapping is conducted on the basis of current water drive, then polymer drive development is conducted in good time, and the oil extraction speed of the oil reservoir is improved.

The invention discloses ferrous ion resistant polyacrylamide as well as a preparation method and application thereof, and relates to the field of polymer preparation of oil field polymer flooding. In order to overcome the viscosity reduction effect of metal ions on a polyacrylamide solution, the polyacrylamide polymer prepared by the invention is prepared from the following raw materials: acrylamide (AM), acrylic acid (AA), 2-acrylamide-2-methylpropanesulfonic acid (AMPS), N, N-dimethyl octadecyl allyl ammonium chloride (DMAAC-18), alkali, a salt-resistant ferrous ion-resistant hydrophobic monomer and deionized water. The ferrous ion tolerance range of the ferrous ion-resistant polyacrylamide is 0-80 mg / L, meanwhile, the salt tolerance reaches 100000 mg / L, the calcium magnesium reaches 10000 mg / L, and the ferrous ion-resistant polyacrylamide can be applied to oil field development polymer flooding, polymer profile control flooding, profile control and other recovery ratio increasing measures.

The utility model relates to the technical field of chemical separation, in particular to an oil-water purification device for ternary and polymer flooding produced liquid. According to the oil-water purification device for the ternary and polymer flooding produced liquid, through the separation assembly in the inclined plate, especially the combination of an inclined limiting block, a pushing cross rod, an isolation block and a filter plate, the device can efficiently and preliminarily separate an oil-water mixture, and the inclined design is beneficial to utilizing the gravity effect; oil and water can be layered more easily according to density difference, separated water can be quickly guided to the outside of the device through the arrangement of a plastic slope, the water is prevented from being accumulated in the device and affecting the separation effect, the transfer box is designed to be used for collecting an oil-water mixture subjected to preliminary separation, and the oil-water separation efficiency is improved. Further purification treatment is carried out through the oil-water adsorption layer, and oil remaining in water can be efficiently adsorbed and removed through the use of the oil-water adsorption layer, especially the close fit design of the oil-water adsorption layer and the inclined knife edge, so that the purification efficiency is improved.

The invention discloses a method for tackifying the viscosity of a polymer displacement fluid, and the method comprises the following steps: S1, stirring a mixture containing thiourea, polyethylene glycol and water I to obtain a tackifying solution; and S2, adding the tackifying solution into the polymer displacement fluid, and stirring II to obtain the tackified polymer displacement fluid. The tackifying method provided by the invention is convenient and simple, adopts traditional dissolution compounding, is low in raw material price and easy to operate, is stable in tackifier product, and can be used for preparing the polymer tackifying liquid with specified viscosity by adjusting the addition amount according to actual requirements.

This invention discloses a heat-resistant, high-salt-resistant, highly surface-active polymerizable macromonomer and its preparation method. The structure of the heat-resistant, high-salt-resistant, highly surface-active polymerizable macromonomer is shown in Formula I, R 1 C2-C with a carbon-carbon double bond at the end 16 Hydrocarbon chain, R 2 It is an alkylene group, R 3 R 4 It is a C1-C3 alkyl group; R 5 The monomers are selected from tert-butyl, n-butyl, and benzyl; the number of C2H4O atoms p = 1 to 6. The method for preparing the temperature-resistant and high-salt-resistant polymerizable macromonomer of this invention uses widely available raw materials, is safe, simple, and easy to operate. Temperature can be precisely controlled, and the reaction is highly efficient. The high-surface-active, temperature-resistant, and high-salt-resistant polymerizable macromonomer prepared by this invention can self-polymerize and copolymerize with acrylamide. The resulting polymer oil displacement agent exhibits high surface activity and good salt resistance.

The invention provides a middle-phase microemulsion based on a biological surfactant and a preparation method and application of the middle-phase microemulsion, and the middle-phase microemulsion is prepared from the following raw materials in percentage by weight: 0.2-0.8% of the biological surfactant; 0.1 to 0.4 percent of a cosurfactant; 8-12% of inorganic salt; 45-55% of an oil phase; 35-45% of water; the biological surfactant comprises single rhamnolipid and / or double rhamnolipid. The middle-phase microemulsion is used for oil displacement, interfacial tension can be greatly reduced, alkali does not need to be added into the middle-phase microemulsion, only a small amount of auxiliaries are needed, the concentration of the used main agent is low, economic benefits are high, the recovery efficiency can be greatly improved, and the middle-phase microemulsion can be used for polymer flooding and other chemical flooding to further improve the recovery efficiency.

The application discloses a kind of offshore platform polymer flooding preparation systems with three-dimensional layout and reduced ground viscosity shear loss.The polymer flooding preparation system includes polymer dry powder feeding system, forced stretching system, forced dispersion system and injection polymer pump connected in sequence;Polymer dry powder feeding system and forced stretching system are arranged on the top deck of offshore platform;Forced dispersion system is arranged on the middle deck of offshore platform;Injection polymer pump is arranged on the lower deck of offshore platform.The application uses the gravity potential difference formed by the height difference generated by the multi-deck structure of offshore platform, replaces the feeding pump, conveying pump and other devices in the conventional offshore polymer flooding ground injection preparation system to overcome the flow friction resistance of high-viscosity polymer mother liquor, and maintains the necessary flow operation pressure;Using conventional nitrogen inert seal cover system or offshore platform common membrane nitrogen system, through increasing pressure control device, the pressure supplement or adjustment of each node of polymer flooding ground preparation process system is completed, and the normal operation of ground system is maintained.

This invention relates to a human-computer interaction robotic hand based on a shape memory polymer actuator and its application. The robotic hand includes a bionic robotic hand, a shape memory polymer actuator, a controller, a power supply, and sensors. The bionic robotic hand includes a palm and fingers composed of phalanges. The phalanges and the palm and fingers are connected via shape memory polymer actuators. The shape memory polymer actuator and sensors are respectively connected to the controller. The controller is connected to the power supply. The sensors are attached to the back of the operator's hand, and when the operator moves their hand, the voltage signals generated by the sensors are sent to the controller. The bionic robotic hand is attached to the back of the user's hand. The controller is used to perform thermal actuation control on the shape memory polymer actuator upon receiving the voltage signals, thereby realizing the movement of the bionic robotic hand. The human-computer interaction robotic hand of this invention has a simple structure, is lightweight, comfortable, and has high human-computer interaction safety.

This invention discloses a dynamic monitoring method for polymer flooding reservoir plugging based on multi-point pressure measurement. The method includes: uniformly setting multiple pressure measurement points along the axial direction of a sand-filled model; experimental system setup and debugging; multi-stage displacement experiments and pressure monitoring, sequentially performing water flooding, polymer flooding, and subsequent water flooding; experimental data acquisition, identifying pressure surge events; core plugging dynamic characteristic analysis, identifying pressure surge processes during subsequent water flooding, and analyzing the maximum amplitude of each pressure surge, pressure surge interval, first surge pressure measurement point, core response pressure measurement point, pressure coverage area, surge coverage, and core pressure measurement point migration trajectory; outputting plugging dynamic monitoring results, integrating and analyzing the results, and generating a chart of the core plugging migration trajectory during the subsequent water flooding stage of polymer flooding. This application can achieve synchronous and accurate acquisition of pressure data from different locations in polymer flooding reservoir cores, and can comprehensively capture the spatial distribution characteristics and dynamic evolution laws of core plugging.