Oil-displacement experimental device used for low-permeability sandstone oil reservoir and oil-displacement experimental method used for low-permeability sandstone oil reservoir

Abstract

The invention provides an oil-displacement experimental device used for a low-permeability sandstone oil reservoir and an oil-displacement experimental method used for the low-permeability sandstone oil reservoir. The device comprises a core holding unit, a water intermediate container, a constant-pressure and constant-speed pump and a water-gas dispersion system generator, wherein the constant-pressure and constant-speed pump is connected with the water intermediate container; the water intermediate container is connected with the core holding unit through the water-gas dispersion system generator; the core holding unit is used for containing a core sample; the core sample is subjected to gas displacement in the core holding unit; the water-gas dispersion system generator is heated to the set temperature; the constant-pressure and constant-speed pump exerts the pressure of deionized water in the water intermediate container to the set pressure; the deionized water with the pressure reaching the set pressure is injected into the water-gas dispersion system generator to form a water-gas dispersion system; and the water-gas dispersion system is used for performing oil-displacement experiment on the core sample in the core holding unit. The device and the method have the advantages that the realization principle is simple; the flow seeping resistance can be obviously improved; a gas channeling passage is sealed and plugged; and the recovery degree of the low-permeability core is improved.

Description

technical field [0001] The invention relates to petroleum development technology, in particular to an oil displacement experimental device and method for low-permeability sandstone reservoirs. Background technique [0002] Low-permeability sandstone reservoirs have huge resource potential, but also have huge exploration and development difficulties, and are currently the focus of domestic and foreign petroleum geology and petroleum engineering experts. In my country, "low permeability" resources occupy an increasingly important position, and how to develop low permeability oil fields reasonably and efficiently is becoming increasingly important. However, due to insufficient natural energy in low-permeability oilfields, in order to obtain stable production at a higher rate and higher recovery rate, it is a natural idea to inject fluid to replenish energy to the formation for displacement production. [0003] In the prior art, low water absorption capacity, high start-up pres...

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Problems solved by technology

[0004] In order to solve the problem of high gas mobility and easy channeling in the gas injection development of low-permeability sandstone reservoirs, the present invention provides an oil displacement experimental device for low-permeability sandstone reservoirs. The oil displacement experimental device includes: core holder , a water intermediate container, a constant pressure and constant speed pump, and a water-gas dispersion system generator; the constant pressure and constant speed pump is connected to the water intermediate container, and the water intermediate container is connected to the core holder through the water-gas dispersion system generator connected; among them,

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