Water-Gas Ratio and Early Warning of Water Invasion in Unconsolidated Sandstone Gas Reservoirs in Sebei Gas Field, Qaidam Basin

Abstract

Abstract: The Sebei gas field in the Qaidam basin is an anticline shallow unconsolidated sandstone gas field driven by weak edge water, and is developed with a depletion pattern. According to the water-gas ratio, the production process of the gas reservoirs in the gas field can be divided into four stages: low water-cut steady production stage, stage of initial water invasion, stage of edge water breakthrough, and stage of strong water invasion. The occurrence of water invasion can be accurately monitored based on the water-gas ratio. The stage of edge water breakthrough can be used as a time window for predicting the extensive water invasion of edge water, and duly adjusting the development plan can prolong the steady production period. The stage of strong water invasion with high water cut corresponds to a long production period, so it is an important stage for enhanced oil recovery while producing with water.

Key words: Qaidam Basin, Sebei gas field, biogas reservoir, unconsolidated sandstone, edge water, elastic water drive, water-gas ratio, early warning of water invasion

CHAI Xiaoying, WANG Yan, LIU Junfeng, CHEN Fenjun, YANG Huijie, TAN Zhiwei. Water-Gas Ratio and Early Warning of Water Invasion in Unconsolidated Sandstone Gas Reservoirs in Sebei Gas Field, Qaidam Basin[J]. Xinjiang Petroleum Geology, 2023, 44(zk(English)): 98-104.

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