Abstract
Aiming at the poor effect of water flooding with the well pattern in a high dip reservoir in West Africa, the well pattern deployment of the reservoir is optimized to improve sweep efficiency considering different driving modes. Taking well space and relation of injector-producer as indexes, the adaptability of the current well pattern is analyzed quantitatively. Based on numerical simulation, the sweep law of high dip reservoir under different driving modes is revealed, and the well pattern deployment and production parameters are optimized for different reservoir parts. Results show: the current well pattern deployment mainly has the deficiencies of low ratio of injector to producer in the low part, large well space in the waist and poor waterflooding in the high part. For the water drive, the sweep efficiency in the middle and high part is low. Gas drive can improve the sweep efficiency in those parts, but gas channeling might occur. The whole reservoir adopts both water injection in bottom and gas injection in top. The low part is dominated by water injection in row, well spacing is 200-300 m, and voidage replacement ratio (VRR) is increased to 1.1–1.2. The waist adopts spotted water injection, and the well spacing is densified to 300 m. Gas injection is implemented in the high part to form an artificial gas cap to maintain pressure, the well spacing remains unchanged, and VRR is between 1.0–1.1. The overall oil recovery can be improved by 5.8%. This study provides a reference for improving the development effect of such reservoirs both considering water and gas drive.
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This paper was prepared for presentation at the 2022 International Field Exploration and Development Conference in **’an, China, 16–18 November 2022.
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Acknowledgements
This study was supported by the Scientific Research and Technology Development Project of CNPC (NO. 2021DJ3203).
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Li, Xl., **ao, K., Li, Xb., Zhang, Jt. (2023). Adaptability Analysis and Optimization of Well Pattern Placement for High Dip Reservoir. In: Lin, J. (eds) Proceedings of the International Field Exploration and Development Conference 2022. IFEDC 2022. Springer Series in Geomechanics and Geoengineering. Springer, Singapore. https://doi.org/10.1007/978-981-99-1964-2_435
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DOI: https://doi.org/10.1007/978-981-99-1964-2_435
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