Abstract:

The Qianmiqiao gas reservoir of Dagang oilfield is a typical abnormally-high-temperature condensate reservoir. Formation water properties are fundamental parameters needed in develop-ing such reservoirs. In the present work, an experimental method is proposed for determination of these properties. Using this method, tests were carried out on the formation water from wells of Banshen-7 and Banshen-8 under high pressures. The results indicate that both the dissolved gas content in the forma-tion water and the saturation water content in the condensate gas are high for these two wells, which must be taken into con-sideration in reserve evaluation and development planning. Inaddition, the water content in the condensate gas in Well Ban-shen-7 has reached saturation level and thus free water may ex-
ist in the formation; on the other hand, water content in that in Well Banshen-8 is not in saturation and thus there is no free wa-ter exsisting in the formation. These results provide valuable reference data for development planning and have been proved valid in development production.

Key words: abnormally-high-temperature, condensate gas reservoir, formation water, PVT, experimental data