TITLE:
Optimization Method for Fine Water Injection in the High Water-Cut Stage of Multi-Layer Heterogeneous Heavy Oil Reservoirs
AUTHORS:
Qiang Sun, Guangming Pan, Junshou Zhao, Longlong Zhang, Yichao Zhang
KEYWORDS:
Water-Drive Development, Multi-Layer Reservoir, Connectivity Coefficient, Injection-Production Connectivity Value, Balanced Displacement, Production and Injection Allocation
JOURNAL NAME:
Journal of Geoscience and Environment Protection,
Vol.13 No.10,
October
21,
2025
ABSTRACT: Aiming at the problem of uneven planar and vertical water flooding in offshore multi-layer reservoirs, this paper establishes a fine water injection optimization method based on injection-production connectivity by using reservoir engineering and numerical simulation methods. According to the equivalent seepage resistance method, a water-drive model for multi-layer reservoirs is established, and the planar connectivity coefficient is calculated through this model. The injection-production connectivity value is further calculated from the connectivity coefficient. Based on the goal of vertical and planar balanced displacement, the formulas for adjusting layered water injection rate and planar liquid production rate are derived. The research results show that the calculation method of the connectivity coefficient is fast, and the difference with the numerical simulation results is small; the fine water injection optimization method based on connectivity can better alleviate the interlayer and planar contradictions, and the well group recovery factor can be increased by more than 2%. The research results can effectively guide water-drive reservoirs to achieve three-dimensional balanced displacement and improve development effects.