Prediction Method and Application of Injection-Production Capacity of Gas Storage Converted from Deep Carbonate Gas Reservoir

doi:10.3969/j.issn.1006-6535.2023.01.018

Abstract

Abstract: The gas storages converted from deep carbonate gas reservoirs are characterized by large high and low pressure variations, stress sensitivity, and strong heterogereity. Using conventional methods to calculate its injection-production capacity will lead to large errors in production capacity. In response to the above problems, stress sensitivity is considered. The binomial productivity equation was revised in view of the influence of stress sensitivity and gas physical property changes, and on this basis, a calculation method of injection-production capacity suitable for the gas storage converted from deep carbonate gas reservoirs was established. Example calculations are carried out in conjunction with the Shapingchang Carboniferous Gas Reservoir in the Sichuan Basin, the influencing factors are analyzed, and the results show that: for type Ⅰ and Ⅱ pore-fracture collocation model reservoirs, the reasonable gas production rate of gas wells is controlled by outflow dynamics under low pressure and limited by erosion flow under high pressure, while the reasonable gas injection rate is controlled by outflow dynamics under high pressure and limited by erosion flow under low pressure; for type Ⅲ pore-fracture collocation model reservoirs, the reasonable gas injection and production rates of gas wells are mainly controlled by the outflow dynamics. The influence of stress sensitivity on the maximum gas injection rate of the gas well is 0.81%~9.69%, and the influence of the change of gas physical parameters is 5.15%~35.29%; under the existing wellbore structure conditions, when the gas injection rate is 55×10⁴ to 70×10⁴ m³/d, the frictional pressure loss can reaches to 10 MPa; when the inner diameter of the tubing increases from 62.0 mm to 112.0 mm, the maximum gas injection volume increases to 2.6 times. The research results can provide technical support for the calculation of the injection-production capacity of deep carbonate gas storages, and have guiding significance for the construction and operation of such gas storages.

Key words: deep carbonate gas reservoir, gas storage, stress sensitivity, friction loss, injection-production capacity, Shapingchang Carboniferous

CLC Number:

TE344

Wang Rong, Li Longxin, Liu Xiaoxu, Luo Yu, Zhang Na. Prediction Method and Application of Injection-Production Capacity of Gas Storage Converted from Deep Carbonate Gas Reservoir[J]. Special Oil & Gas Reservoirs, 2023, 30(1): 126-133.

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