Development Characteristics and Countermeasures Practice ofWater Drive Gas Reservoir in East China Sea

The developed gas reservoirs in East China Sea are mainly distributed in the central anticline belt and the western slope belt of XH Depression. The gas reservoir type is mainly water drive gas reservoir. After the gas reservoir is put into development, it is generally faced with the problem of water production, which affects the recovery of gas reservoir. In order to effectively improve the development effect of water drive gas reservoirs in East China Sea, the development characteristics of developed water drive gas reservoirs was systematically analyzed, and the water production characteristics and main controlling factors in different development stages were summarized. A full-cycle waterproof and water control strategy of 'early waterproof, process water control and later drainage' was established, and supporting technologies such as horizontal well trajectory optimization and horizontal well variable density directional perforation were developed. Through the use of full-cycle water-proof and water-control development countermeasures, the water-free gas recovery period of gas wells in East China Sea water-drive gas reservoir has been significantly improved. After the gas well is produced, reasonable drainage measures are adopted to effectively improve the cumulative production level of water-producing gas wells.