Inter-well interference and well spacing optimization in Weirong shale gas field in Sichuan Basin
Received date: 2024-05-15
Revised date: 2025-01-10
Online published: 2025-05-13
Supported by
The Science and Technology Project of SINOPEC(P22041)
Optimal well spacing is crucial for maximizing single-well productivity and fully utilizing reserves， serving as a core indicator for evaluating development effectiveness. Due to the influence of natural fractures and production sequence， in the Weirong Gas Field， the annual well opening pressure has been decreasing year by year， and the inter-well interference has been intensifying year by year， which has seriously affected the production and construction effect. In order to reduce the inter well interference and improve the productivity construction efficiency， through the analysis of the interference between wells， it is clear that the main causes of the interference between wells are natural fractures and old well energy deficiency. Based on this， numerical simulation method was used to quantitatively evaluate the impact of different well spacing， different degree of fracture hit and different cumulative gas production of old wells on the EUR of new wells， and a targeted differentiated well spacing optimization design method is formed. The results show that： （1） The smaller the well spacing and the higher the degree of fracture hit， the greater the impact on the EUR of new wells， with an impact degree of 7.1%-15.1%； （2） The smaller the well spacing and the higher the cumulative gas production of old wells， the greater the impact on the EUR of new wells， with an impact degree of 8.1%-28.3%； （3） In natural fracture development areas， according to the fracture hit degree， the recommended well spacing is 350-450 m； （4） Near the old well，based on the energy deficiency of the old well，the recommended well spacing is 400-500 m.Through the application of well spacing optimization， the well opening pressure increased by 9.3 MPa and EUR increased by 22.8% after optimization， which achieved good application effect， and can provide reference for the well pattern arrangement of similar gas reservoirs.
Jian YANG , Guowei ZHAN , Yong ZHAO , Liuyang XIANG . Inter-well interference and well spacing optimization in Weirong shale gas field in Sichuan Basin[J]. Natural Gas Geoscience, 2025 , 36(5) : 773 -781 . DOI: 10.11764/j.issn.1672-1926.2024.10.002
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