Abstract
In recent years, greenhouse gases have increased in the atmosphere, and climate change concerns have triggered global efforts to find solutions for CO2 capture, separation, transport, and storage. Geological sequestration in the depleted unconventional reservoir is an effective measure to reduce the atmosphere’s CO2 content. The exact evaluation of the CO2 storage capacity can verify the feasibility of storing carbon dioxide and parameter optimization. A reasonable boundary element method to estimating the CO2 storage capacity of depleted shale gas reservoirs considering arbitrarily shaped boundaries is introduced. Firstly, the physical model with fracture networks is built based on the microseismic data. Then, the flow equation including the matrix and fracture can be obtained considering adsorption, and the star-delta transformation is used to deal with interconnected fracture segments. The point source function with an infinite boundary can be obtained after the Laplace transform method. Finally, the semianalytical flow solution is obtained by using the boundary element method in the Laplace region. Moreover, the results have a high agreement with commercial software for the regular boundary. The sensitivity of relevant parameters is analyzed by this method, and the importance of considering the boundary shape is emphasized. This method can evaluate the CO2 storage capacity of formation with the irregular boundary and is regarded as the guide of parameter optimization in CO2 storage.
Highlights
Greenhouse gases such as CO2 have increased in the atmosphere leading to climate change concerns [1]
Most research on gas injection for improving oil recovery takes a typical block as an example, which is based on the black oil numerical simulation with less consideration on the mechanism
This study appraises CO2 geological storage potential based on the boundary element method, evaluating the storage capacity considering arbitrarily shaped boundaries
Summary
Greenhouse gases such as CO2 have increased in the atmosphere leading to climate change concerns [1]. Global efforts have been made to reduce atmospheric CO2 concentration by carbon sequestration, including geological sequestration, mineral carbonation, and ocean storage [2]. The gas injection into the reservoirs is widely used in petroleum engineering to enhance oil recovery, and it is feasible to store CO2 in geological formations as a CO2 reduction option [4]. In 2009, Shoaib and Hoffman first conducted mathematical modeling studies on enhanced recovery by CO2 flooding and CO2 injection huff-n-puff based on the Elm Coulee field A depleted shale gas formation has been selected as the targeted formation, which is located in China. China has enormous development potential for shale gas, and it can be a prospective location for CO2 storage projects to reduce greenhouse gases.
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