The purpose of this paper is to investigate experimentally the changing regularity about the thickness of adsorbed water layer on solid particle with driving gradient pressure by using micro-glass ball.

According to the laboratory water-flooding experiments of 21 cores from Chang 8 formation in Xifeng oilfield,the relationships between water oil displacement efficiency andreservoir permeability,water injection multiple and displacement pressure gradient are gained.

Unsteady seepage model for low permeability reservoir with threshold pressure gradient;

Numerical model considering threshold pressure gradient for stress-sensitive low permeability reservoir;

At present,the study of threshold pressure gradient in home and abroad is only theoretical,and the experimental study is a little.

Influence of start-up pressure gradient and stress sensitivity on productivity of low-permeability gas reservoirs;

Numerical simulation of pinnate horizontal multilateral well for coal-bed gas development in consideration of start-up pressure gradient;

Numerical simulation of productivity of fractured gas well with start-up pressure gradient considered;

Experiment on starting pressure gradient of oil and water two phases flow in low permeability core.;

A new solution and application of starting pressure gradient in ultra-low permeability reservoir;

An experimental study on starting pressure gradient of fluids flow in low permeability sandstone porous media;