Type C and type D are integrated to propose new water drive characteristic curves,which are the water drive characteristic curve expression equivalent completely equivalent to classic water drive characteristic curve,and able to reflect the relation of water cut-recovery degree,the shape a.

For holding the accurate recovery degree prior to polymer- flooding concerns the result evaluation and application on polymer-flooding in the second type oil layers, on the basis of comparing the advantages and disadvantages by computing the static and pe.

As a result,the cycle recovery degree could be enhanced 1.

Numerical modelling for improving recovery percent of reserves during huff and puff;

Based on percolation theory and material balance principle, draws out the relationship between oil recovery rate and recovery percent of reserves, approves its linear feature.

The effects of the interbeds with different lengths and different locations on bottom-water coning are studied, and then the laws of the relative length of the interbed influencing water breakthrough time and no-water recovery percent of reserves are obtained.

Similarity theory of recovery percent and water cut in water flooding reservoir;

Generalized logistic cyclic model for predicting oilfield recovery percent.;

The first can be used to describe different forms of water cut curves and recovery percent with wide adaptability and without viscosity and reservoir type limitation; the second is to resolve the fault of existing general (ideal) water-drive characteristic curves which can not describe the correlation between water cut and recovery per.

Study on mining degree and patterns of ground subsidence in condition of mining under thick unconsolidated layers;