Reservoir Evaluation Method and Development Countermeasures for Fracture-Vuggy Reservoir

doi:10.3969/j.issn.1006-6535.2021.06.017

Abstract

Abstract: The fracture-vuggy reservoir in Tahe Oilfield is highly inhomogeneous, and the complex oil-water relationship and uneven reserve production in the middle and late development stages will lead to great difficulty in exploring remaining oil. In response to the problem that the existing reserve classification method is not applicable to effective guidance in the fine development of the main area, volume carving method was adopted for reserve recalculation, the accuracy of fracture-cavern carving was improved through attribute optimization, the accuracy of reserve calculation was enhanced by differential assignment of parameter partitioning, the reserve classification criteria were refined according to the fracture-cavern connectivity characteristics and reserve utilization, and the reserves were classified into three categories: unconnected reserve, connected nonproducing reserve and connected producing reserve. Development adjustment measures were taken for different types of reserves, for example, new well deployment and well pattern improvement were mainly adopted for unconnected reserve and connected nonproducing reserve, and injection-production adjustment between wells for connected and producing reserve. Reserve evaluation technology was employed to guide new well deployment and injection-production adjustments. Since 2018, 31 new wells have been put into production in Tahe Block 4, and oil-water well adjustment measures were implemented in 25 wells, and the daily oil production was increased from 270 t/d to 700 t/d, showing remarkable comprehensive improvement effect. The research results have implications for efficient adjustment in the intermediate and late stages of fracture-vuggy reservoir development.

Key words: fracture-vuggy reservoir, connectivity, reserve evaluation, development countermeasures, carbonate rock, Tahe Oilfield

CLC Number:

TE344

Geng Tian, Lyu Yanping, Wu Bo, Zhang Xiao, Wen Huan. Reservoir Evaluation Method and Development Countermeasures for Fracture-Vuggy Reservoir[J]. Special Oil & Gas Reservoirs, 2021, 28(6): 129-136.

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