Determining the Influence of Supercritical CO2 on the Formation Sensitivity of Tight Sandstone

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It is challenging to resolve the issue of water-based fracture fluid flowing back into low-pressure gas reservoirs. Supercritical CO2, which is available to the fracturing flowback in low-pressure tight sandstone, is thought to be a novel non-aqueous fracturing technology with a wide range of potential applications. to investigate whether low pressure tight sandstone and supercritical CO2 fracturing are feasible. Supercritical CO2 fracturing, which has unmatched advantages over traditional hydraulic fracturing, has been shown through studies conducted both domestically and overseas to be the key to developing unconventional natural gas resources. Supercritical CO2 was used to interact with tight sandstone samples under formation conditions, and then the changes in velocity sensitivity, water sensitivity, salinity sensitivity, alkaline sensitivity, and acid sensitivity of tight sandstone were observed. Tight sandstone cores from the Jinqiu Gas field in the Sichuan Basin were used to evaluate the influence of supercritical CO2 on the formation sensitivity of sandstone reservoir. Velocity sensitivity damage decreased by 6.0%, water sensitivity damage by 11.5%, salinity sensitivity damage by 16.0%, alkaline sensitivity damage by 0.5%, and acid sensitivity damage by 17.5% after the interaction between tight sandstone and supercritical CO2. The impact of supercritical CO2 on formation sensitivity has been quantified in this research, which can offer scientific direction for the creation of a supercritical CO2 fracturing scheme for low-pressure, water-sensitive tight sandstone.

Author(s) Details:

Huan Peng,
Engineering Technology Research Institute of Southwest Oil and Gas Field Company, PetroChina, Chengdu-610017, China and Key Laboratory of Oil and Gas Well Stimulation Technology of Southwest Oil and Gas Field Company, Chengdu-610017, China.

Jian Yang,
Engineering Technology Research Institute of Southwest Oil and Gas Field Company, PetroChina, Chengdu-610017, China and Key Laboratory of Oil and Gas Well Stimulation Technology of Southwest Oil and Gas Field Company, Chengdu-610017, China.

Junliang Peng,
Engineering Technology Research Institute of Southwest Oil and Gas Field Company, PetroChina, Chengdu-610017, China and Key Laboratory of Oil and Gas Well Stimulation Technology of Southwest Oil and Gas Field Company, Chengdu-610017, China.

Xing Yang,
Southwest Oil and Gas Field Company, Petro China, Chengdu-610051, China.

Zhifan Yang,
Engineering Technology Research Institute of Southwest Oil and Gas Field Company, PetroChina, Chengdu-610017, China and Key Laboratory of Oil and Gas Well Stimulation Technology of Southwest Oil and Gas Field Company, Chengdu-610017, China.

Please see the link here: https://stm.bookpi.org/NFPSR-V2/article/view/8206

Keywords: Supercritical CO2, tight sandstone, formation sensitivity, fracturing technology, experimental evaluation

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