Research on CO2 Volume Fracturing and Process Parameter Optimization in Tight Sandstone Reservoirs

doi:10.3969/j.issn.1672-7703.2025.05.011

Abstract

Abstract: There are a series of problems of tight sandstone reservoirs in Ordos Basin, such as poor physical properties, large burial depth, high clay mineral content, and great difficulty in post-fracturing backflow. CO₂ fracturing has advantages such as reducing rock fracture pressure, reducing fluid loss and promoting backflow, which is a targeted measure for reservoirs with poor physical properties, high clay content and low pressure coefficient. Therefore, based on the true triaxial simulation of tight sandstone fracturing reconstruction process with three different injection methods, i.e., CO₂ prepad, CO₂ foam injection, and CO₂ associated injection, the variation law of core fracture pressure and fracture distribution characteristics of tight sandstone reservoirs have been analyzed through similarity criterion, and the difference in core fracturing results has been compared. In addition, Petrel geological–fracturing integrated platform has been applied to conduct numerical simulation of reservoir fracture propagation with different CO₂ injection modes. The quantitative experimental analysis results show that the ranking of fracturing effects is as follows: hydraulic fracturing for rock breaking > CO₂ foam > CO₂ associated injection > CO₂ prepad. Compared with hydraulic fractures, fracture network is the most complex by using CO₂ prepad fracturing, followed by CO₂ foam, and it is the poorest by CO₂ associated injection, which is consistent with numerical simulation results. Furthermore, the variation law of reservoir fracture network parameters with fracturing operation parameters given the different injection methods has been clarified, and a fracturing parameter optimization plate has been prepared. The new understanding provides operational guidance and suggestions for the beneficial development of tight sandstone reservoirs.

Key words: true triaxial, CO₂ prepad, CO₂ foam, CO₂ associated injection

CLC Number:

TE357.13

Lin Xiaobo, Zhang Yanming, Ma Zhanguo, Xiao Yuanxiang, Su Yubin, Gu Yonghong, Wang Lili, Liu Xinjia, Zhao Bochao, Yan Zhichen. Research on CO₂Volume Fracturing and Process Parameter Optimization in Tight Sandstone Reservoirs[J]. China Petroleum Exploration, 2025, 30(5): 145-160.

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Research on CO₂Volume Fracturing and Process Parameter Optimization in Tight Sandstone Reservoirs

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