3results about How to "EOR" patented technology

The application discloses a method for determining the amount of a CO2 flooding plugging agent for gas channeling channels, and particularly relates to the technical field of oil and gas field development engineering. The method comprises the following steps: establishing a corresponding mathematical model by using geological parameters of an oil reservoir, wherein the geological parameters include top structure, bottom structure, sand body thickness, effective thickness, permeability, porosity, saturation, fluid high-pressure physical property, temperature and pressure; performing history matching by using development dynamic data to obtain gas channeling channel parameters, including channel type and thickness; selecting gas channeling channels with a gas saturation greater than 0.65, and determining the positions of the gas channeling channels; calculating the total gas channeling volume Q according to the parameters of the gas channeling channels; and finally optimizing the injection amount of the plugging agent. The method can accurately and quickly determine the positions and volumes of the gas channeling channels, and can also optimize and calculate the amount of the plugging agent. Compared with the prior art, the method can improve the CO2 flooding recovery rate of the oil reservoir, has high testing precision, is simple to operate and low in cost.

This invention provides an oil displacement surfactant and its preparation method, relating to the field of surfactant technology. An oil displacement surfactant comprises the following raw materials in parts by weight: 10-30 parts of modified sulfonate surfactant, 5-10 parts of modified filler, 3-5 parts of lower alcohol, and 700-1000 parts of water. The preparation method of the modified sulfonate surfactant includes: under a protective atmosphere, stirring and reacting sodium olefin sulfonate, fatty alcohol polyoxyethylene ether, and solvent at temperature T1; adding maleic anhydride and an initiator; adjusting the pH at temperature T2; and rotary evaporation to obtain the final product. The oil displacement surfactant provided by this invention exhibits excellent stability, wettability, and oil recovery rate.

This invention provides a method, apparatus, and electronic device for improving the fluidity of porous media using pulsating flow. The method includes: determining a critical threshold and a subcritical baseline; applying a steady-state displacement with a displacement intensity equal to the subcritical baseline, and superimposing a pulsating drive; using a solution framework to advance the interfacial motion of droplets under pulsating drive over time, adaptively controlling the time step during the advancement process, the time step being jointly limited by multiple physical constraints; determining the truncated axial net displacement of the droplet within the pore throat contraction structure within a fixed observation time window; obtaining the fluidity index corresponding to the pulsating drive based on the truncated axial net displacement; keeping the amplitude of the pulsating drive constant, changing the frequency of the pulsating drive to obtain a first curve of the fluidity index changing with frequency, and determining a cutoff frequency based on the first curve; changing the amplitude of the pulsating drive to obtain a second curve of the cutoff frequency changing with amplitude. This method is suitable for engineering parameter design and selection and is reproducible.