Differential development technological measures for high-water-cut tight sandstone gas reservoirs in western area of Sulige Gas Field

Sulige Gas Field is a typical tight sandstone gas field with yearly production of 250×108 m3, and its western area is an important backup reserve area for its long-term stable production. However, low-resistivity gas layers and enrichment areas can be hardly identified and production wells produce gas and water simultaneously and are weak in liquid carrying capacity, which restricts the effective development of natural gas in this area. Based on the geological characteristics of the gas reservoir, this paper studies logging-based pay zone identification, gas and water distribution controlling factors, enrichment area selection and differential development technological measures for different natural gas enrichment areas from the perspective of dynamic and static combination. And the following research results are obtained. First, gas and water distribution in the western area is characterized by poor gas and water differentiation, disorderly gas and water layer distribution and no unified gas/water contact. Second, hydrocarbon generation intensity and reservoir heterogeneity play a controlling role in gas and water distribution. The former controls the macroscopic pattern of gas and water distribution. The higher the regional hydrocarbon generation intensity, the more developed the gas layer. The latter controls the local charging and accumulation of natural gas. Third, gas and water distribution models can be vertically classified into five types, namely upper water and lower gas type, upper gas and lower water type, gas between water type, mixed gas and water in thick reservoir type and pure gas type. Fourth, the differential development technological measures for high-water-cut tight sandstone gas reservoir which take logging-based pay zone identification, enrichment area selection, water production splitting, production mechanism and production cycle optimization as the cores are put forward to deal with four main challenges to the development of Sulige Gas Field. In conclusion, the proposed differential development technological measures for high-water-cut tight sandstone gas reservoirs can solve the four challenges to the development of Sulige Gas Field and provides a technical support for the sustainable stable production of Sulige Gas Field and a reference for the development of similar gas reservoirs. © 2022, Natural Gas Industry Journal Agency. All right reserved.