Assessment of residual oil saturation with time-differentiated variable multiple material balance model

Deng, Zhiyong; Liu, Ding; Zhang, Hengrong; Tan, Wei Jian.; Wang, Yuan

doi:10.1016/j.engeos.2021.08.004

Cited by 6 publications

(2 citation statements)

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“…The formation water resistivity of water-flooded layers should be the combination of original formation water resistivity and injected water resistivity, which is the resistivity of mixed filtrate. If the elastic changes of fluid and rock skeleton are not considered, it can be considered that the main factor affecting formation water resistivity is the salinity of formation water [25,[27][28][29][30]. That is to say, the formation produced fluid is only caused by the formation injected water, and it is assumed that the injected water and the original formation water are fully ion exchanged and mixed in the process of water injection.…”

Section: Calculation Of Formation Water Resistivitymentioning

confidence: 99%

“…From the initial stage to the middle stage, then to the later stage, with the increase of injected water, the oil saturation of oil reservoir changes, and the reservoir is gradually flooded. The change of oil saturation in water-flooded reservoir will have a great impact on the development measures of remaining oil [3][4][5][6][7]. The calculation of oil saturation in water-flooded layers has always been a difficult problem for geologists.…”

Section: Introductionmentioning

confidence: 99%

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Calculation of Water-Flooded Layers Oil Saturation Based on Modified Archie model

Wang¹,

Liu²,

Zhen³

et al. 2022

Preprint

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Archie model is the basis of calculating oil saturation, but there are some limitations when using this model to calculate oil saturation in water-flooded layer. The main reason is that the main parameters, such as rock resistivity and formation water resistivity, are constantly changing dynamic parameters in the underground with the influence of injected water. Considering that water-flooded layers changes with injection waters, influence factors of rock resistivity and formation water resistivity of primary parameters are analyzed. Considering the dynamic data of water cut is the most reactive underground fluid characteristics of real information, combined with dynamic and static, and the “double ratio” model of later development by the same sedimentary layer is established, which realizes the inversion of rock resistivity and formation water resistivity, then modified Archie model relating to water-flooded layers of the same sedimentary explaining formation. The explanation of actual data indicates that the “double ratio” model well considers the dynamic variation of production data, which makes the inversion of the flooded rock resistivity relatively accurate, besides, the modified Archie model can accurately calculate the oil saturation of water-flooded layers with a reasonable result, which offers scientific basis for the predicting of remaining oil distribution rules.

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Section: Calculation Of Formation Water Resistivitymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%