To research the performance of starting pressure for two-phase (oil-water or oil-gas) flow, experiments of water driving oil and gas driving oil are done on natural cores, each relative permeability is worked out, the relative starting pressure gradients are calculated according to single-phase starting pressure gradient formula, and then the oil-water and oil-gas permeability curves are derived.

Method of establishing two-phase starting pressure curve;

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;