期刊
INTERNATIONAL JOURNAL OF OIL GAS AND COAL TECHNOLOGY
卷 29, 期 1, 页码 52-74出版社
INDERSCIENCE ENTERPRISES LTD
DOI: 10.1504/IJOGCT.2022.119340
关键词
gel treatment; CO2 storage; leakage remediation; silica gel; cross-linked polymer gel; heterogeneity; Dykstra-Parsons coefficient; spatial uncertainty; reservoir simulation
Injection of gel systems can effectively reduce CO2 leakage in storage reservoirs, and the treatment success is highly dependent on the selection of appropriate operating conditions for specific reservoir properties.
We perform a reservoir simulation study to investigate injection of gel systems, including cross-linked polymer gels and silica gels, as a treatment method for fracture sealing and leakage remediation in CO2 storage reservoirs. An adsorption and permeability reduction approach was adopted to model the fracture sealing by the gel. The results show that for both gel systems a successful treatment can reduce CO2 leakage by 10(3) times over 25 years of post-treatment CO2 injection. The effects of operating conditions, reservoir heterogeneity, and associated uncertainty on the treatment results were investigated by changing the injection time, injection rate, cross-linked polymer or silica concentration, reaction frequency factor, average reservoir permeability, and spatial correlation length. The simulation results show that selecting the appropriate operating conditions for specific reservoir properties are important to the success of CO2 leakage remediation. [Received: March 23, 2020; Accepted: November 15, 2020]
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