Research on Composite 3D Well Pattern for Blocky Heavy Oil in Offshore Areas: Transition from Huff-and-Puff to Displacement-Drainage

作者：Zhigang Geng, Gongchang Wang, Wenqian Zheng, Chunxiao Du, Taotao Ge, Cong Tian, Dawei Wang · 发表于：Processes · 年份：2024 · DOI：10.3390/pr12122884 · 研究领域：Reservoir Engineering and Simulation Methods、Geological Modeling and Analysis、Enhanced Oil Recovery Techniques

In view of the deep burial depth, high formation pressure, and presence of top and bottom water in offshore extra-heavy-oil reservoirs, this paper conducts a study on the production performance and flow field variation law of steam huff-and-puff to steam flooding conversion in thick heavy-oil reservoirs based on physical simulation, and analyzes the development effect of the conversion from steam huff-and-puff to steam flooding. On this basis, by comprehensively considering the advantages of gravity-assisted steam flooding and a three-dimensional HHSD well pattern obtained from physical simulation experiments, this paper proposes a well pattern development mode of steam huff-and-puff to composite displacement and drainage, and analyzes the development effect of this well pattern mode using the reservoir numerical simulation method. The research results show that, compared with the planar well pattern of steam huff-and-puff to steam flooding conversion, the adoption of the three-dimensional well pattern can significantly improve the degree of reservoir production and the expansion dynamics of the steam chamber, and mitigate adverse effects such as the increase in water cut caused by top and bottom water on thermal recovery. The composite development of steam huff-and-puff to composite displacement and drainage can be divided into three stages: thermal communication, gravity drainage-assisted steam flooding, and thermal breakthrough erosion and oil washing. The steam chamber pr...