Improved CRM Model for Inter-Well Connectivity Estimation and Production Optimization: Case Study for Karst Reservoirs

Daigang Wang, Yong Li, Jing Zhang, Chenji Wei, Yuwei Jiao and Qi Wang
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Daigang Wang: Beijing International Center for Gas Hydrate, Peking University, Beijing 100871, China
Yong Li: Research Institute of Petroleum Exploration and Development, PetroChina, Beijing 100083, China
Jing Zhang: Research Institute of Petroleum Exploration and Development, PetroChina, Beijing 100083, China
Chenji Wei: Research Institute of Petroleum Exploration and Development, PetroChina, Beijing 100083, China
Yuwei Jiao: Research Institute of Petroleum Exploration and Development, PetroChina, Beijing 100083, China
Qi Wang: Research Institute of Petroleum Exploration and Development, PetroChina, Beijing 100083, China

Energies, 2019, vol. 12, issue 5, 1-15

Abstract: Due to the coexistence of multiple types of reservoir bodies and widely distributed aquifer support in karst carbonate reservoirs, it remains a great challenge to understand the reservoir flow dynamics based on traditional capacitance–resistance (CRM) models and Darcy’s percolation theory. To solve this issue, an improved injector–producer-pair-based CRM model coupling the effect of active aquifer support was first developed and combined with the newly-developed Stochastic Simplex Approximate Gradient (StoSAG) optimization algorithm for accurate inter-well connectivity estimation in a waterflood operation. The improved CRM–StoSAG workflow was further applied for real-time production optimization to find the optimal water injection rate at each control step by maximizing the net present value of production. The case study conducted for a typical karst reservoir indicated that the proposed workflow can provide good insight into complex multi-phase flow behaviors in karst carbonate reservoirs. Low connectivity coefficient and time delay constant most likely refer to active aquifer support through a high-permeable flow channel. Moreover, the injector–producer pair may be interconnected by complex fissure zones when both the connectivity coefficient and time delay constant are relatively large.

Keywords: capacitance-resistance model; aquifer support; inter-well connectivity; production optimization; karst carbonate reservoir (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2019
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (2)

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