Integrated construction technology for natural gas gravity drive and underground gas storage

JIANG Tongwen,WANG Zhengmao,WANG Jinfang

Table 1 Difference between integrated construction and conventional gas storage.

UGS con- struction method Construction time Working mode Operation mode Formation pressure Pore fluid Cushion gas scale Injection and production scale Working gas volume Profit model Gas injection pressure Technology Stress change Integrated UGS con- struction High formation pressure Saturated oil-gas-water three phases Natural formation after oil displacement Improve single-well oil production Less to more Deposit transfer fee of oil and gas High pressure gas injection Huff and puff from small scale to large scale Small change of periodic stress Gas reservoir UGS Close to abandonment pressure Low-pres- sure saturated gas Need large scale cushion gas Improve single well productivity Improve the working gas volume Deposit transfer fee of gas Low pressure to high pressure Large scale huff and puff High-strength stress change