Abstract
The heterogeneity of glutenite reservoir is serious, and breakthrough is easy to occur in the process of water drive and gas drive, which reduces the sweep efficiency. The serious vertical heterogeneity in the H well area of Xinjiang oilfield led to the rapid gas breakthrough during gas injection test. Water alternating gas flooding and foam profile control are often used to seal breakthrough. In this paper, based on the actual reservoir characteristics, vertical heterogeneous planar model is made for flooding experiment. The experimental results show that after gas breakthrough caused by water alternating gas flooding, the flue gas foam can effectively block the high permeability layer and develop the low permeability layer, improve the sweep efficiency and recovery percent, and provide reference for the development adjustment of actual reservoir after gas breakthrough.
Highlights
Most of the oilfields in China belong to continental sedimentary type, with great difference in permeability and serious heterogeneity
The existing research shows that water alternating gas flooding and foam profile control are often used to slow down gas breakthrough and enhance oil recovery
When water flooding was converted to water alternative flooding (WAG), the pressure differential increased from 0.308MPa to 0.368MPa, and the water cut decreased from 100% to 54.64%
Summary
Most of the oilfields in China belong to continental sedimentary type, with great difference in permeability and serious heterogeneity. The interlayer heterogeneity is serious in H well area of Xinjiang oilfield, and the difference of vertical producing degree is wide. The existing research shows that water alternating gas flooding and foam profile control are often used to slow down gas breakthrough and enhance oil recovery. Compared with the core experiment, the physical simulation experiment of 2D planar model is closer to the actual situation of the reservoir, and can reflect the law of the water and gas breakthrough and the effect of measures to control gas breakthrough to a greater extent. Based on the planar model flooding experimental equipment and planar sand packed model, the laboratory physical simulation experiment of the control of gas breakthrough during flue gas drive is carried out in this paper, which provides reference for the development and adjustment measure of heterogeneous reservoir after flue gas breakthrough
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