Abstract
The development practice of low permeability reservoir shows that there is start-up pressure gradient in low permeability reservoir, and the lower the permeability is, the higher the start-up pressure gradient is. Therefore, there are different types of sandstones in low-permeability sandstone reservoirs, with different permeability and different starting pressure gradient, resulting in different seepage space. This paper attempts to establish mathematical model and numerical simulation model to simulate the movement law of oil and water in low permeability reservoir by considering different seepage space and its starting pressure, so as to study the distribution and variation law of invalid water injection in space, and provide basis for formulating reasonable injection production ratio and other injection production policies.
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