Visualization experiment of water invasion development in thick-layer marine sandstone reservoir with bottom water

doi:10.3969/j.issn.1006-6535.2025.06.015

Abstract

Abstract: Aiming at the problem of unclear understanding of water invasion streamlines and remaining oil distribution patterns caused by interlayers during the water invasion development of thick layer marine sandstone reservoirs with bottom water,two dimensional visual reservoir waterflooding experiments were conducted to explore the effects of interlayers and well patterns on the water invasion development of reservoirs with bottom water from the aspects of microscopic streamline evolution,macroscopic development performance and spatial distribution of remaining oil.The results indicate that interlayers in bottom water invasion development reservoirs can delay water coning to some extent and extend the water-free oil production period,with the recovery degree during the water-free oil production period reaching over 30.00%;"secondary edge water" and gravitational differentiation are the main mechanisms for oil production in the upper part of interlayers,while "erosion" is the main mechanism for oil production in the lower part of interlayers;under the composite interlayer distribution mode,reasonable well placement can increase the oil displacement efficiency from 65.51% to 71.42% and the sweep efficiency from 80.10% to 95.23%,effectively improving development performance.The research findings contribute to clarifying the water invasion development characteristics and the spatial distribution patterns of remaining oil in thick layer marine sandstone reservoirs with bottom water,providing guidance for the efficient development of such reservoirs in the eastern South China Sea.

Key words: reservoir with bottom water, water invasion development, interlayer distribution, remaining oil distribution, visualization

CLC Number:

TE135

DAI Ling, LIU Chenglin, ZHAO Yulong, SUN Changwei, GU Yue, TANG Xiaolong, ZHOU Xiang, XIE Longgan. Visualization experiment of water invasion development in thick-layer marine sandstone reservoir with bottom water[J]. Special Oil & Gas Reservoirs, 2025, 32(6): 124-132.

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