Determination of Reasonable Well Pattern Density for Tight Gas Reservoirs in Sulige Gas Field

doi:10.7657/XJPG20250316

Abstract

Abstract:

Well pattern optimization for tight gas reservoirs is generally implemented at the overall deployment stage. In the central Sulige gas field, which is now in mid-to-late development stage, the productivity construction enters the well infilling stage. To ensure the performance of infill wells, it is essential to evaluate the reasonable well pattern density under varying reservoir conditions, infill timing, and natural gas prices. In this study, typical well blocks with different reserves abundances in the central Sulige gas field were selected for numerical simulation. By analyzing development indicators of gas wells and gas reservoirs under different well pattern densities, the degree of gas well interference and formation pressure distribution of existing wells at different production stages were assessed. Based on these findings, the ultimate cumulative gas production of infill wells was predicted. By integrating economic parameters such as natural gas prices, the reasonable well pattern density for different infill timings was determined, enabling economically well infilling. The application in the Sulige gas field demonstrates that, at a natural gas price of 1.119 yuan/m3, a reasonable well pattern density of 4.5 well/km2 can be deployed in non-producing areas; for infill drilling near existing wells within 3 years of production, the well density can be increased to 3.5 well/km2; if the gas price rises to 1.550 yuan/m3, infill drilling near wells within 5 years of production can reach 5.0 well/km2.

Key words: Sulige gas field, tight gas reservoir, reasonable well pattern density, cumulative gas production, internal rate of return, infill timing, recovery factor, reserves abundance

CLC Number:

TE377

LI Peng, FAN Qianqian, XU Wen, LIU Lili, FAN Jiwu, BAI Hui. Determination of Reasonable Well Pattern Density for Tight Gas Reservoirs in Sulige Gas Field[J]. Xinjiang Petroleum Geology, 2025, 46(3): 382-387.

Figures/Tables 8

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