Experimental Study on Water Invasion in Full-Diameter Cores From Fractured Carbonate Reservoirs

doi:10.7657/XJPG20230413

Abstract

Abstract:

Faults and fractures are developed in the marine carbonate gas reservoirs on the right bank of the Amu Darya basin. Water is active locally, which leads to severe water invasion during development. Through high-temperature and high-pressure displacement experiments on full-diameter core samples from complex fractured reservoirs, the influences of fracture permeability, fracture penetration degree and water volume multiple on water invasion in gas reservoirs were analyzed. The water invasion patterns in different fractured core samples were investigated by considering the dynamic changes in the water-gas ratio (WGR). The results indicate that as the fracture penetration degree, fracture permeability, and water volume multiple increase, the slope of the WGR curve under the corresponding water invasion pattern increases, suggesting more severe water invasion and channeling. The areas with incomplete fracture penetration can effectively restrain any sudden water invasion. Accordingly, the characteristics of water invasion patterns were further analyzed by using the water invasion diagnosis curves, and the index chart for diagnosis of water invasion in the study area was optimized.

Key words: Turkmenistan, Amu Darya basin, carbonate rock, fractured reservoir, edge/bottom water, physical simulation, water invasion, diagnosis curve

CLC Number:

TE371

HU Yong, LE Ping, GUO Chunqiu, CHEN Pengyu, XIAO Yun, QU Simin, WANG Xin. Experimental Study on Water Invasion in Full-Diameter Cores From Fractured Carbonate Reservoirs[J]. Xinjiang Petroleum Geology, 2023, 44(4): 479-484.

Figures/Tables 11

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