Abstract
Gravity Assisted Gas Drainage (GAGD) is one of the most effective options to improve sweep efficiency of mature oil fields at high water cut period, the oil recovery of which is highest among all non-miscible gas injection schemes. However, its application behavior is affected by reservoir heterogeneity parameters, production and injection well pattern, injection gas operation parameters, and other underground & facility factors, which always vary in a large range, and have huge numbers of combinations and complex interaction between each other, contributing to time consuming and unaffordable simulation runs. In order to investigate factors affecting GAGD, a response surface method based on experimental design and secondary information constraints is proposed to optimize GAGD design. Firstly, enhance oil recovery mechanism of GAGD was analyzed based on a large number of sector models simulation runs and reservoir engineering experience, and 9 influential factors were determined. Secondly, different factor levels were given by experiment design technology, and two standard variants of each parameter combinations, i.e. final oil recovery factor and gas breakthrough time, were calculated by solvent immiscible simulation method to illustrate performance of GAGD. Finally, a response surface function representing GAGD parameter optimization was established by using multivariate regression method and considering secondary information of parameters, and then the optimal parameters set for GAGD was obtained by applying steepest descent algorithm to solve above-mentioned response surface function. The application in a faulted mature oil field in East China shows that the proposed method and strategy can quickly and quantitatively determine the optimal parameters set for GAGD, which are in line with actual field practice, improving the efficiency of the GAGD design, and can be used to GAGD program design of mature oil fields after long-term water flooding.
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Acknowledgments
This project is supported by National Science and Technology Major Projects (Number 2017ZX05030-001) and China National Petroleum Corporation’s Major Science and Technology Projects (Number 2017D-4406).
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Yang, C. et al. (2021). The Optimization Strategy of Gravity Assisted Gas Drainage in Mature Oil Field Based on Experiment Design and Response Surface Methodology. In: Lin, J. (eds) Proceedings of the International Field Exploration and Development Conference 2020. IFEDC 2020. Springer Series in Geomechanics and Geoengineering. Springer, Singapore. https://doi.org/10.1007/978-981-16-0761-5_224
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DOI: https://doi.org/10.1007/978-981-16-0761-5_224
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