On deep gas and deep basin gas in Weibei Depression;

Drill-in fluid technology for protecting deep gas reservoir;

Types and pooling patterns of deep gas reservoirs in Xujiaweizi fault depression

In this paper the concepts concerning deep-seated gas are discriminated and analyzed and finally deep-seated gas is defined as natural gas generated and accumulated at >4500 m depth under the combined action of high temperature, high pressure and environment media.

Under control of gas generating sub-depression; regional cap-rock, deep high pressure, secondary hydrocarbon generation of coal-bearing series, deep-seated gas is concentrated in inherited uplifts and lithologic sandbody growing area.

To the feature of containing CO2 or pure CO2 in deep layer gas field of Jilin oilfield, for avoiding corrosion of testing tool, a combining testing sting which composes parts of APR testing tool and a whole APR and perforation combining testing tools are designed.

Cementing technique of deep gas wells in Daqing Oilfield;

Primary completion string technology for fracturing and operation of deep gas wells;

Anti-corrosion technology applied in CO_2-contained deep gas wells in Xushen gas field

Cap formation of deep gas reservoir and its controlling effect on natural gas reservoir forming in eastwards, Daqing placanticline;

The deep gas reservoir of Western Sichuan Depression features in super depth,ultrahigh pressure,and complicated trap formation,so fracturing gets difficult.