Upper Limit of Water Saturation for Profitable Development of Tight Sandstone Gas Reservoirs in Sulige Gas Field

doi:10.7657/XJPG20220311

Abstract

Abstract:

In the Sulige gas field, tight sandstone gas reservoirs present a high water saturation. The water cut increases rapidly after the gas wells are put into production. With the increase of water cut, the production of gas wells declines greatly or even stops. Based on the analysis of production performance of water-producing gas wells, the relationships between the water saturation and the cumulative gas production and recovery rate of the gas wells were established. Combined with the single well investment and natural gas price, the minimum cumulative gas production required to recoup the investment in a gas well was determined, and accordingly the upper limit of reservoir water saturation was determined. Furthermore, taking the minimum cumulative gas production of gas wells as the standard, and considering the reservoir water saturation and reservoir thickness, the quantitative indicators for the logging interpretation of gas layers, gas-water layers and gas-bearing water layers were determined. The results show that the upper limit of water saturation of tight sandstone reservoirs in the central part of Sulige gas field is 48.2%, and when the economic minimum cumulative gas production in the life cycle of a gas well reaches 1 260×10⁴ m³, the gas well is profitable.

Key words: Sulige gas field, tight sandstone gas reservoir, water saturation, water-gas ratio, recovery rate, logging interpretation, economic benefit, single well cumulative gas production

CLC Number:

TE322

XIAO Feng, YUE Jun, LI Zhichao, LIU Lili, ZHANG Ji, FAN Jiwu, ZHANG Tao. Upper Limit of Water Saturation for Profitable Development of Tight Sandstone Gas Reservoirs in Sulige Gas Field[J]. Xinjiang Petroleum Geology, 2022, 43(3): 335-340.

Figures/Tables 7

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