By matching the data of gas permeability and corresponding initial pressure gradient, the relationship between the gas permeability and starting pressure gradient is derived, with which the initial press.

The theory of operation is based on a new method of measuring the gas permeability Kg.

Because of long-term development of maturing fields and development of logging tools,there is a big difference between the same kind of logging curves in the same stratum of the same oilfield,which has great effect on establishment of the air permeability interpretation model.

Using the known relationship f ormula and charts of technical recovery reserve's economic conversion ratio of d eveloped oilfields and reserve air permeability, new .

At present, China has no national standard of Anode's air permeability, and the International standard is strict with it,taking America anode for example this paper,discusses the effect of the pitch content on physicochemistry index of carbo brush by changing the pitch content.

The coal core flow tests are conducted in following steps: injecting 5 g/L salt water to measure water phase permeability,K_w;injecting in opposite direction N_2 gas to measure gas phase permeability,K_g,changing with time,t;injecting 2 g/L surfactant solution in the salt water and measuring K′_w;injecting in opposite direction N_2 gas to measure K′_g,changing with t;the water phase .

The hydrogen permeability of the composite membrane is very high and the cost of the composite membrane is low because the palladium silver alloy film is very thin.