考虑注水体积倍数及离子交换的水淹层剩余油评价方法

doi:10.13809/j.cnki.cn32-1825/te.2023.06.011

Abstract

Abstract:

Accurately calculating the salinity and resistivity of mixed solution in water-flooded layers is the key basis for evaluating the water-flooded condition and remaining oil saturation in middle-late development stage. This paper focuses on simulating water-flooding processes with varying salinities and measuring resistivity at the rock core scale. A novel model for calculating the resistivity of mixed solutions was developed, taking into account the efficiency of injected-water sweep and ion exchange. This model was formulated based on theoretical analysis and provides an accurate representation of the properties of reservoir mixed solutions during water-flooding. It significantly enhances the accuracy of mixed-water resistivity calculations. The established model was successfully used in H Block of Qinghai Oilfield and the calculated water saturation was consistent well with the core analysis result with the total coincidence rate reached 92.33 %. The interpreted water-flooded layers were matched well with the actual production performance, the effectiveness of the established model was validated and lays a foundation for quantitative evaluation in the water-flooded layers.

Key words: water-flooded layers, ion exchange, injected-water volumes, mixed solution resistivity, remaining oil saturation

CLC Number:

TE311

LI Guoyan, CHANG Lin, CHEN Meng, ZHONG Ping, CHEN Jie, WANG Lin, LI Yuping, ZHANG Yu. Evaluation method of remaining oil in water-flooded formation considering injected-water volumes and ion exchange[J].Petroleum Reservoir Evaluation and Development, 2023, 13(6): 801-808.

Figures/Tables 6

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Evaluation method of remaining oil in water-flooded formation considering injected-water volumes and ion exchange

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