Well Pattern Optimization for Fractured-Vuggy Carbonate Reservoirs in Tahe Oilfield

doi:10.7657/XJPG20230406

Abstract

Abstract:

Fractured-vuggy carbonate reservoirs are characterized by large differences in reservoir scale, strong spatial discreteness, complex fracture-vug connectivity between wells, and diverse fluid flow patterns. The low control degree of fractures and vugs results in uneven producing of reserves and different water/gas flooding effects. The regular and irregular well patterns for conventional sandstone reservoirs are not applicable to fractured-vuggy carbonate reservoirs. Therefore, it is necessary to establish a well pattern construction and optimization method that matches the characteristics of fractured-vuggy carbonate reservoirs. By combining physical simulation experiments with theoretical analysis and following the idea of constructing a “three-dimensional” and “systematic” well pattern, the theoretical connotation of spatially structural well patterns is enriched, and the fundamental understanding of gravity displacement theory in the construction of spatially structural well patterns is deepened. A well pattern design method and a 6-step well pattern construction process are established, focusing on fracture-vug structures, connectivity, reserves producing, energy conditions, and injection-production structures. It is concluded that the difference in fluid density is the dominant factor of gravity displacement, the potential difference in the fracture-vug connectivity structure is the important driving force for vertical displacement, and the displacement speed difference between primary and secondary channels is the key to vertical balance and serves as an efficiency mechanism for EOR of fractured-vuggy reservoirs with spatially structural well patterns.

Key words: Tahe oilfield, carbonate rock, fractured-vuggy reservoir, fracture-vug structure, gravity displacement, spatially structural well pattern, well pattern optimization

CLC Number:

TE344

HU Wenge, LI Xiaobo, YANG Min, LU Xinbian, LIU Xueli, LIU Hongguang. Well Pattern Optimization for Fractured-Vuggy Carbonate Reservoirs in Tahe Oilfield[J]. Xinjiang Petroleum Geology, 2023, 44(4): 429-434.

Figures/Tables 4

References 17

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