38results about How to "EOR effect" patented technology

The invention relates to an oil-displacing agent and an oil-displacing method for enhancing the recovery ratio of high-temperature, high-salinity and high-hardness reservoir crude oil. The oil-displacing agent is composed of the following components in percentage by mass: A, 0.05-0.07% of an amine oxide type amphoteric surfactant; B, 0.15-0.20% of alkylphenol ethoxylate carboxylate; and C, the balance of water. The oil-displacing method disclosed by the invention is implemented through injecting the oil-displacing agent into a natural core subjected to oil-displacing under the conditions that the oil reservoir temperature is 100-120 DEG C, the total salinity of formation water is (10-15)*10<4> mg / L, and the amount of calcium-magnesium divalent metal ions is 7000-10000 mg / L, so that residual oil is in contact with the oil-displacing agent, and then the residual oil is fully displaced. The oil-displacing agent provided by the invention reaches the magnitude order of 10<-3> mN / m under the condition of high-temperature, high-salinity and high-hardness salt reservoirs, and the interfacial tension still can be maintained in an ultra-low interfacial tension state after the oil-displacing agent is aged for a long time under the condition of oil reservoirs, therefore, the oil-displacing agent is applied to the tertiary oil recovery production of oil fields.

The invention discloses a test simulating device for improving a recovery rate of coal bed methane by injecting carbon dioxide. The test simulating device for improving the recovery rate of the coal bed methane by injecting the carbon dioxide comprises a coal reservoir simulating system, a gas injecting system, a fracture simulating carbon dioxide injecting system, a carbon dioxide absorbing device and a data collection and control system, wherein the coal reservoir simulating system is used for simulating the conditions of pressure and temperature of a coal reservoir, the gas injecting system is used for injecting methane gas or helium gas into the coal reservoir simulating system, the fracture simulating carbon dioxide injecting system is used for injecting high-pressure liquid into the coal reservoir simulating system, enabling the coal reservoir simulating system to simulate the degree of development of fractures, and injecting the carbon dioxide into the coal reservoir simulating system, the carbon dioxide absorbing device is used for absorbing the carbon dioxide exhausted by the coal reservoir simulating system, and the data collection and control system is used for collecting data and carrying out process control. The test simulating device for improving the recovery rate of the coal bed methane by injecting the carbon dioxide is capable of simulating the real conditions of the coal reservoir, simulating on-spot fracturing and the process of pump injection of the carbon dioxide, simulating effects of improvement of the recovery rate of the coal bed methane by injecting different volumes of the carbon dioxide according to different degrees of the development of the fractures and different conditions of the coal reservoir, and achieving an optimal carbon dioxide injection volume aiming at a specific coal reservoir.

The invention relates to a method for increasing oil recovery in a low-permeability sandstone reservoir; injecting a flexible microgel deep control and displacement agent into the water distribution pipeline of an ultra-low-permeability sandstone reservoir for fracturing water injection in the later stage of oil production well water distribution through a metering pump; The injection concentration of the flexible microgel deep control and displacement agent is 100ppm to 10000ppm; this method: 1) the duration of the stable production and increase of the oil well corresponding to the water injection well is 1 to 5 years; 2) the injection well of the ultra-low permeability sandstone reservoir is injected After the flexible microgel deep control and displacement agent, generally the corresponding oil wells can accumulate oil by 5% to 20%, and the effect of improving oil recovery is obvious.

The invention discloses carboxylic acid higher alcohol ester-trimethyl ammonium chloride and application thereof in a clay stabilizer. The carboxylic acid higher alcohol ester-trimethyl ammonium chloride has double functions of oil displacement and swelling prevention, is particularly suitable for a low-permeability and water-sensitive crude oil reservoir, and consists of the following main components in percentage by mass: 10 to 30 percent of carboxylic acid higher alcohol ester-trimethyl ammonium chloride, 1 to 20 percent of trimethylamine hydrochloride and 50 to 90 percent of water. The carboxylic acid higher alcohol ester-trimethyl ammonium chloride is realized by the technical scheme of: adding an excessive trimethylamine aqueous solution and alpha-chlorinated fatty acid into a pressure reaction kettle; under the condition of the stirring, controlling the reaction temperature to between 50 and 100 DEG C, the reaction pressure to be between 1 and 0.2 MPa, and the reaction time to be between 3 and 5 hours; after the reaction is finished, reducing the temperature to between 40 and 50 DEG C; dripping 30 percent hydrochloric acid into a reaction solution so as to control the PH value of the reaction solution to between 6 and 8; and then diluting the reaction solution to certain concentration by using clear water to obtain an oil displacing type surfactant used for preventing swelling.

The present application discloses a nanomaterial, which is prepared by polymerizing a mixture containing coupled montmorillonite, organic hydrophobic monomer, organic hydrophilic monomer and initiator. The present application proposes a nanomaterial used in low-permeability oil fields. After synergistic action with the surfactant, a gain effect is exhibited, and a nano-oil displacement agent is obtained. Nanomaterials have good long-term stability, low interfacial tension and enhanced oil recovery.

The invention belongs to the field of oilfield chemistry, and in particular relates to an enhanced jelly dispersion deep control and displacement agent suitable for low-permeability, high-temperature and high-salt oil reservoirs. The enhanced jelly dispersion deep control and displacement agent suitable for low-permeability, high-temperature and high-salt reservoirs is composed of functional polymers, cross-linking agents, inorganic reinforcing agents, and water in the following mass fractions: functional polymers, with a mass concentration of 0.4 to 0.6 %; cross-linking agent mass concentration 0.4-0.8%; inorganic reinforcing agent, mass concentration 0.2-0.3%; the balance is water. The average particle size of the enhanced jelly dispersion deep control and displacement agent of the present invention is distributed from nanometer to micron level, can be used for deep control and displacement of low permeability reservoirs, has good deep migration ability, good profile improvement effect, and enhanced recovery factor The effect is remarkable; the deep control and displacement agent can be used for deep control and displacement operations in high-temperature and high-salt oil reservoirs. Effectively improve the formation profile, significantly increase the follow-up water flooding sweep coefficient, and further increase the recovery factor.

The invention discloses a gas injection oil well selecting method. The gas injection oil well selecting method comprises the step of selecting oil well gas injection effect influence factors, wherein the gas injection influence factors comprise construction positions, reservoir body types, well storage relations, remaining oil types, reserve sizes and water cut rising rules; and the step of conduction gas injection potential estimation on all oil wells in a working section sequentially according to the construction positions, the reservoir body types, the well storage relations, the remaining oil types, the reserve sizes and the water cut rising rules, and therefore the oil well to be subjected to gas injection primarily is selected. By means of the gas injection oil well selecting method, the oil well with gas injection potential can be rapidly selected, the gas injection periodic average oil increment is increased by years, up to now, the gas injection periodic average oil increment is greatly improved, and the gas injection effective rate can reach 96.1%. As a whole, by means of the gas injection oil well selecting method, ultra-deep layer fracture-cavity type oil deposit gas injection is greatly improved, the oil recovery effect is improved, and therefore the production benefits are greatly improved.