Oil displacement experimental device and method for low-permeability sandstone reservoirs

Abstract

The invention provides an oil displacement experimental device and method for low-permeability sandstone reservoirs. The device includes: a core holder, a water intermediate container, a constant pressure and constant speed pump, and a water-gas dispersion system generator; a constant pressure and constant speed The pump is connected with the intermediate container of water, and the intermediate container of water is connected with the core holder through the water-gas dispersion system generator; wherein, the core holder is used to place the core sample, and the core holder is placed in the core holder. The sample is subjected to air flooding; the water-gas dispersion system generator is heated to the set temperature, and the constant pressure and constant speed pump applies the pressure of the deionized water in the water intermediate container to the set pressure, and injects the deionized water that reaches the set pressure. The water-gas dispersion system generator forms a water-gas dispersion system, and the water-gas dispersion system is used to carry out oil displacement experiments on the rock core samples in the rock core holder. The realization principle of the invention is simple, and can significantly improve seepage resistance, block gas channeling channels, and improve the recovery degree of low-permeability rock cores.

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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