A method for simulating long-distance foam flooding with carbon dioxide in actual mines

Abstract

The invention relates to a method for simulating actual carbon dioxide long distance foam flooding in an mine field. The method for simulating the actual carbon dioxide long distance foam flooding in the mine field comprises the following steps: 1, testing the actual foam flooding distance of the mine field and the occupation ratio of the actual foam flooding to an injection and production well through a test well; 2, preparing a splicing core; 3, testing the internal pressure of the core at fixed points through a pressure test core holder, at the inlet end of the core, introducing carbon dioxide in a constant-pressure mode and a foaming agent in a constant-speed mode according to a certain gas-liquid mole ratio, fixing the tail end back pressure, and monitoring the pressure of several test points, so that data of the pressure and the corresponding distance to the core are obtained; 4, detecting the foam advancing distance under fixed injection and production pressure; 5, conducting long distance foam flooding. By means of the method, monitoring over the form of a foam system can be effectively achieved, the defoaming position of the foam can be found, foam can be regenerated through multiple times of stirring, and thereby the actual foam flooding distance is advanced, so that the driving status of the actual foam flooding among the injection and production wells can be effectively simulated.

Description

technical field [0001] The invention relates to a carbon dioxide foam flooding technology applied in the field of petroleum engineering, in particular to a method for simulating long-distance carbon dioxide foam flooding in an actual mine. Background technique [0002] Carbon dioxide foam flooding is an important tertiary oil recovery technology, which can reduce gas-oil ratio, expand swept volume, and improve oil displacement efficiency. Foam flooding can effectively reduce the adverse effects of viscous fingering and gravity differentiation. Compared with single gas flooding and surfactant flooding, the effect of enhancing oil recovery is much more obvious. In the actual field test, because the reservoir pressure is high, generally tens of MPa, the natural shear mixing of gas and foaming agent when flowing in the reservoir pores will make the foam flooding in a long distance after injection into the bottom of the well. Existence, the actual mine field can reduce the dista...

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide a method for simulating the long-distance foam flooding of carbon dioxide in actual mines. This method for simulating long-distance foam flooding of carbon dioxide in actual mines is used to solve the problem of indoor evaluation of fully foam flooding for indoor experiments and relative to mine simulation. problem of insufficient

Images