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Energies 2017, 10(11), 1724; doi:10.3390/en10111724

CO2 Storage Capacity for Multi-Well Pads Scheme in Depleted Shale Gas Reservoirs

Key Laboratory of Petroleum Engineering of the Ministry of Education, China University of Petroleum, Beijing 102249, China
Department of Petroleum Engineering, Curtin University, Kensington, WA 6151, Australia
Research Institute of Petroleum Exploration & Development, PetroChina, Beijing 100083, China
Xinjiang Oilfield Branch, PetroChina, Changji Hui Autonomous Prefecture 831511, China
Author to whom correspondence should be addressed.
Received: 12 October 2017 / Revised: 19 October 2017 / Accepted: 23 October 2017 / Published: 27 October 2017
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As a promising technology to improve shale gas (SG) recovery and CO2 storage capacity, the multi-well pads (MWPs) scheme has gained more and more attention. The semi-analytical pressure-buildup method has been used to estimate CO2 storage capacity. It focuses on single multi-fractured horizontal wells (SMFHWs) and does not consider multi-well pressure interference (MWPI) induced by the MWPs scheme. This severely limits the application of this method as incidences of multi-well pressure interference have been widely reported. This paper proposed a new methodology to optimize the injection strategy of the MWPs scheme and maximize CO2 storage capacity. The new method implements numerical discretization, the superposition theory, Gauss elimination, and the Stehfest numerical algorithm to obtain pressure-buildup solutions for the MWPs scheme. The solution by the new method was validated with numerical simulation and pressure-buildup curves were generated to identify MWPI. Using the new method, we observed that the fracture number and fracture half-length have a positive influence on CO2 storage capacity. Both can be approximately related to the CO2 storage capacity by a linear correlation. For a given injection pressure, there is an optimal fracture number; the bigger the limited injection pressure, the smaller the optimal fracture number. Stress sensitivity has positive influences on CO2 storage capacity, thus extending the injection period would improve CO2 storage capacity. This work gains some insights into the CO2 storage capacity of the MWPs scheme in depleted SG reservoirs, and provides considerable guidance on injection strategies to maximize CO2 storage capacity in depleted SG reservoirs. View Full-Text
Keywords: depleted shale reservoir; multi-well pad production scheme; multi-well pressure interference; CO2 storage; sensitivity analysis depleted shale reservoir; multi-well pad production scheme; multi-well pressure interference; CO2 storage; sensitivity analysis

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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Meng, Z.; Yang, S.; Wang, L.; Zou, J.; Jiang, Y.; Liang, C.; Wang, J.; Zhong, Z. CO2 Storage Capacity for Multi-Well Pads Scheme in Depleted Shale Gas Reservoirs. Energies 2017, 10, 1724.

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