56results about How to "Improve displacement efficiency" patented technology

The invention provides a steam-and-nitrogen composite swallowing-spitting oil production method, comprising the following steps: a, steam injection string laying: a pipe column structure successively comprises an even steam distribution pipe column provided with an even steam distribution valve and a compensator, an injection and extraction integrated pump connected to the even steam distribution pipe column, an oil pipe arranged on the pump, and a subcritical steam injection well from bottom to top; b, N2 and steam injection: steam is injected through an oil jacket annulus, meanwhile, nitrogen is injected into an oil well through the oil pipe, nitrogen injection speed is regulated to evenly allocated and injected during the whole steam injection process; c, soaking: soaking is carried out for 2-7 days after steam injection and nitrogen injected are over; d, blowout: when the well pressure drops to 0.5Mpa / day, blowout is controlled by an oil nozzle; and e, pumping start: when open-flow liquid amount reaches 3t / d, the injection and extraction integrated pump is used to start pumping.

This invention provides a shear mode-type piezoelectric actuator using a piezoelectric ceramic composition free from lead having a high coercive electric field and a liquid ejection head having the shear mode-type piezoelectric actuator. The shear mode-type piezoelectric actuator is characterized by using a piezoelectric ceramic composition having a solid solution including a main component of general formula (1) and an auxiliary component of general formula (2) added in an amount of less than 1% by mole based on the total amount of the solid solution, General formula (1) {LiX(K1-YNaY)1-X}(Nb1-Z-WTaZSbW)O3 (Wherein 0< / =x< / =0.2, 0< / =y< / =1, 0<z< / =0.4, 0<w< / =0.2) General formula (2) ABO3 (Wherein A denotes Bi and B denotes at least one of Fe, In and Sc).

The invention provides a method for improving the recovery rate of highly sensitive heavy oil reservoirs, which utilizes high-temperature clay stabilizers, slow-release acid liquid systems, high-efficiency oil displacement agents and carbon dioxide in the development of sensitive heavy oil reservoirs to improve Single well development effect, a new method to improve the recovery of sensitive heavy oil reservoirs. The technical plan is: firstly use the temperature-sensitive slow-release acid system to treat the pollution near the wellbore, then inject liquid carbon dioxide, use high-temperature clay stabilizer to protect the oil layer before steam injection, and inject high-temperature oil displacement during steam injection Dosage system. Then, after the well is closed and the well is soaked, the well is opened and the blowout is released, the pump is lowered into the well for continuous oil recovery. The field test shows that the average periodic oil-steam ratio of vertical wells reaches 0.4, the average periodic oil-steam ratio of horizontal wells reaches 0.6, and the periodic oil production exceeds 1000t. Laboratory experiments show that the development of this invention in sensitive heavy oil reservoirs involves technology, oil The final recovery rate of the reservoir can reach more than 35%.

The invention relates to a deep sea water parameter measuring device, and the prior device has low displacement efficiency and poor effect. The invention comprises a cabin and a sealing cover which are fixedly connected through bolts, wherein the central position of the upper end surface of the cabin is provided with a groove to form a sensor cavity; the bottom surface of the sensor cavity is an isosceles triangle surface which is parallel to the cabin end surface; the cabin is provided with two sensor installation holes; the two needle-type pH sensors are respectively arranged in the two sensor installation holes; two apopores are symmetrically arranged on the two outer side walls of the cabin to which the two base angles of the isosceles triangle directs; an inlet opening is arranged onthe outer side wall of the cabin to which the vertex angle of the isosceles triangle directs; and one inlet opening and two apopores are respectively provided with an electromagnetic valve on the opening of the outer side wall of the cabin. In the invention, the cavity shape of the sensor cavity, the quantity and distribution of the through holes are improved, thus being capable of greatly improving displacement efficiency, improving the trueness of the buffer solution or the sea water samples in the cavity after the completion of the displacement process, and being suitable for the sea watersamples of various densities.

The invention relates to a method of displacing oil by anionic-cationic composite surfactant and mainly solves the problems that the prior method of displacing oil by surfactant is low in oil displacement efficiency in tertiary oil recovery and an oil displacement system containing inorganic base is harmful to stratums and oil wells, corrosive to equipment and pipelines and difficult for demulsification. According to the technical scheme, crude oil is allowed to contact with oil-displacing agent, and the oil-displacing agent comprises, by weight percent, 0.01-5.0% of anionic-cationic composite surfactant, 0.01-3.0% of polymer, and 92.0-99.98% of injected water. The problems are solved well. The method is applicable to tertiary oil recovery for oil fields.

According to an aspect of the invention, the generation of cracks can be inhibited and the displacement efficiency can be improved. A piezoelectric device including a pressure chamber, a piezoelectricelement, and a diaphragm disposed between the pressure chamber and the piezoelectric element. The diaphragm has a crystal plane {100} of a single crystal silicon base. The piezoelectric element is disposed on the diaphragm so as to overlap an inner periphery of the pressure chamber in plan view, and has an inner edge on a center side of the pressure chamber with the inner periphery of the pressure chamber being sandwiched within the piezoelectric element in plan view. A shape of the inner edge of the piezoelectric element is such that in the smallest first rectangle, which includes the inneredge in plan view, the inner edge is on the inside of each of sides at a middle portion of each of the sides of the first rectangle. A shape of the inner periphery of the pressure chamber is such thatin the smallest second rectangle, which includes the inner periphery in plan view, the inner periphery is on the inside of each of sides at a middle portion of each of the sides of the second rectangle. A direction of one side out of the first rectangle and the second rectangle lies along a crystal orientation <010> in the crystal plane.

The invention provides a nanometer composite oil displacement agent, and a preparation method and application thereof. The preparation method comprises the following specific steps: mixing acrylamide,sodium p-styrenesulfonate and water according to a mass ratio of (10.5-13.5): (4.5-5): (90-99) so as to obtain a mixed solution; adding a surfactant accounting for 5 to 7% by weight of the mixed solution into the mixed solution, then adjusting the pH value of the mixed solution to 7 to 7.5, and then adding an inorganic nanometer intermediate accounting for 1 to 3% by mass of the mixed solution into the mixed solution so as to obtain a reaction solution; adding an initiator into the reaction solution in an inert atmosphere, and carrying out a reaction at 75 to 80 DEG C for 8 to 10 h to obtaina polymer emulsion; and subjecting the polymer emulsion to demulsification, drying and crushing to obtain the nanometer composite oil displacement agent. The nanometer composite oil displacement agentprovided by the invention has the characteristics of good temperature resistance, good salt resistance and capacity of reducing oil-water interfacial tension, and can be used for oil production engineering of high-permeability, medium-permeability and low-permeability oil and gas reservoirs and later residual oil reservoirs of tertiary oil recovery.

An oil displacing agent and a preparation method thereof. The oil displacement agent comprises 3-30% by weight of alcohol ether carboxylate, 10-40% by weight of fatty alcohol polyoxyethylene ether, 20-65% by weight of quaternary ammonium salt, 0-21% by weight of fatty alcohol polyoxyethylene ether sodium sulfate, 0-36% by weight of ester sodium salt, 5-25% by weight of sophorolipid, 0-15% by weight content of isopropanol. The method comprises: under stirring conditions, optionally adding the isopropanol into a container, adding the alcohol ether carboxylate, the fatty alcohol polyoxyethylene ether, the quaternary ammonium salt, and the sophoric acid Glycolipids, the fatty alcohol polyoxyethylene ether sulfonate and optionally the fatty alcohol polyoxyethylene ether sodium sulfate and the ester sodium salt are added into the container, and stirred until colorless and transparent to obtain the oil repellant. The oil displacement agent of the present application can increase the oil recovery rate of the oil reservoir, and is resistant to high temperature, high salt and heavy oil.