Enhanced Gas Recovery Technology for Large High-stack Tight Sandstone Gas Reservoirs

doi:10.11885/j.issn.1674-5086.2022.01.24.03

Abstract

Abstract: The formation of Shaximiao gas reservoir in Xinchang Gas Field is tight, with ultra-low permeability, low porosity, and extremely low in natural productivity. It is mainly developed through artificial fracturing. By systematically analyzing the main factors affecting the gas reservoir recovery, a comprehensive technology was formed, which was based on the fine description and classification evaluation of the gas reservoir. The core was based on the distribution law of residual gas of the quantitative evaluation with the integration of modeling and simulation and the evaluation of the development potential of residual reserves constrained by profit. And the means was three-dimensional development of well pattern and optimization of differentiated countermeasures. The research results showed that it had limitation for tight sandstone gas reservoirs to rely on a single technology to improve the recovery factor, and the joint research of multiple technologies could maximize the recovery factor and effectively increase the recovery factor of the Shaximiao Formation gas reservoir by 31.71%. Multiple rounds of fine gas reservoir descriptions had laid the foundation for the selection of strategies for enhanced gas recovery, and the error rate of recalculated reserves was less than 2%. Quantitative description and potential evaluation of remaining gas provided a reliable guarantee for infill adjustment and benefit development of gas reservoirs, clarify the types of remaining gas in gas reservoirs and their benefit development limits, and he recovery was increased by 8.28%. The three-dimensional development and differentiated development strategies of multi-layer mixed well pattern were the main means to achieve enhanced gas recovery in gas reservoirs, and the recovery was enhanced by 23.43%.

Key words: tight sandstone gas reservoir, residual gas, 3D development, differentiated strategy, enhanced gas recovery

CLC Number:

TE377

LI Huachang, LI Huaji, LI Feng, XU Xin. Enhanced Gas Recovery Technology for Large High-stack Tight Sandstone Gas Reservoirs[J]. Journal of Southwest Petroleum University(Science & Technology Edition), 2022, 44(3): 110-120.

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