Occurrence Laws of Microscopic Remaining Oil in High Water-Cut Reservoirs：A Case Study on Blocks Xiaoji and Gangxi in Dagang Oilfield

doi:10.7657/XJPG20210407

Abstract

Abstract:

In order to describe the microscopic distribution of remaining oil in high water-cut reservoirs during the late development stage, and guide subsequent fine development of remaining oil in blocks Xiaoji and Gangxi in Dagang oilfield, remaining oil data was observed under an ultraviolet fluorescent stereo microscope and then was processed, and finally the distribution of the remaining oil is divided into three levels, namely, weak sweep, medium sweep and strong sweep, and the occurrence states of the remaining oil are divided into five types, namely, cluster shape, pore-surface film shape, slit shape, corner shape and intergranular adsorption. In the high water-cut stage, the content of the remaining oil in different occurrence state is in the order of cluster, pore-surface film, corner, intergranular adsorption to slit shapes from high to low. After poly/surface compound flooding, remaining oil occurrences like clusters and pore-surface films are dominant. Such remaining oil could be exploited by improving rock wettability. The distribution of remaining oil in conglomerate is more complex than that in sandstone. Remaining oil in sandstone are almost distributed as clusters and intergranular adsorption, which can be exploited by controlling the fluidity of injected fluid.

Key words: Dagang oilfield, high water cut, microscopic remaining oil, occurrence law, ultraviolet fluorescence, water flooding, poly/surface compound flooding

CLC Number:

TE357

LI Yiqiang, ZHANG Jin, PAN Deng, YAN Yun, LIU Mingxi, CAO Han, GAO Wenbin. Occurrence Laws of Microscopic Remaining Oil in High Water-Cut Reservoirs：A Case Study on Blocks Xiaoji and Gangxi in Dagang Oilfield[J]. Xinjiang Petroleum Geology, 2021, 42(4): 444-449.

Figures/Tables 7

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