碳酸盐岩缝洞型油藏提高采收率关键技术

doi:10.11743/ogg20200219

Abstract

Abstract:

China is rich in fractured-vuggy carbonate oil reserves, with proved reserves in place of 29.3×10⁸ t, which has become an important target for China's hydrocarbon exploration and development, and important contributor for the increase of reserves and production.Due to the low reservoir and fluid description accuracy, the variation in flow patterns, and the difficulty to predict flow pattern by simulation of carbonate fractured-vuggy reservoirs in a burial depth of 6500m, the transverse flow in water injection is prone to cause abrupt watered-out wells, resulting in a low recovery rate of only 14.9%.Development and production in such reservoirs are a world-class problem.After many years of research and practice, we developed a series of technologies to enhance oil recovery, including geophysical description, geological modeling, water and gas injection, and acid fracturing.The developed STOOIP has increased 42% with an EOR(enhanced oil recovery) of 2.3 percent in the structural units tested with the new technologies, which are applicable to the development of similar deep or ultra-deep reservoirs with strong heterogeneity.

Key words: improved water injection, gas flooding, fractured-vuggy oil reservoir, carbonate reservoir, EOR

CLC Number:

TE327

Zhijiang Kang, Yang Li, Bingyu Ji, Yun Zhang. Key technologies for EOR in fractured-vuggy carbonate reservoirs[J]. Oil & Gas Geology, 2020, 41(2): 434-441.

Figures/Tables 6

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Key technologies for EOR in fractured-vuggy carbonate reservoirs

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