Based on gray relation theory and porous flow-electric current similarity principle, this paper presents a direct method for determining dominant water flowing direction between injectors and producers by analyzing the gray's association degree between oil and water wells' monthly volume, and porous flow resistance coefficient.

This paper presents the productivity formula of common vertical wells or horizontal wells in low permeable reservoirs with threshold pressure gradient by using equivalent filtrational resistance ways.

Method\ Percolation of multiple-hole horizontal well is exchanged to radial percolation by applying conformal transformation theory and local percolation restriction.

In accordance with the characteristics of Wuliwan low-permeable oil reservoir and its well-testing interpretation result, the author adjusts the reservoir permeability reasonably around the well bottom hole on the basis of equal permeating resistance method.

Mechanism of seepage induced casing damage and numerical simulation;

Effects of deformation field,coallification degree and the electronic field on the seepage law of methane gas in coal;

Consequence analysis on the seepage the poisonous liquid;