Test method for intrastratal nonhomogeneous model

Abstract

The invention relates to a test method for an intrastratal nonhomogeneous model. The method comprises the following steps of: determining the porosity, the air permeability, the water phase permeability, the oil phase effective permeability and the bond water saturation of a plurality of natural reservoir cores serving as single-layer core models respectively; putting all the layers of cores with bond water into a nonhomogeneous multi-layer core holding device according to a reverse rhythm order, wherein the core holding device is provided with a plurality of liquid outlets, each liquid outlet is aligned with a layer of core respectively, a joint between two layers of correspondingly adjacent cores on the right tops of the cores is provided with a sealing gasket, and effluent liquid which passes through each layer of core flows out from the corresponding liquid outlet of each layer; adding 0 to 50MPa of ambient pressure; performing water displacement on the cores at a speed of between 0 and 10ml/min; recording the water breakthrough time, the accumulated oil yield during the water breakthrough time, the accumulated liquid yield, and displacement differential pressure at both ends of each layer of core; and finishing an experiment when the moisture content reaches 99.95 percent. By the test method, the variation rules of nonhomogeneous water displacing oil in each layer can be precisely reflected.

Description

technical field [0001] The invention relates to a method for simulating combined injection and delamination mining in an oil field, in particular to an intralayer heterogeneity model test method. Background technique [0002] In oil field development, oil layer heterogeneity is one of the important factors affecting oil field development, especially in the case of combined oil layer water injection, oil layer heterogeneity not only reduces the thickness of the oil layer, but also affects the The oil displacement efficiency of the oil layer has a greater impact and reduces the ultimate recovery factor. Therefore, understanding the change law of displacement efficiency in heterogeneous reservoirs during water flooding can provide a theoretical basis for adjusting development measures and improving development effects. [0003] At present, the research on heterogeneity can be divided into intralayer heterogeneity research and interlayer heterogeneity research. The research met...

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Problems solved by technology

Its disadvantage is that the existing core holder has a liquid inlet and a liquid outlet, which can only measure the change of the overall oil displacement efficiency of the multi-layer core model during the water injection process, but cannot realize layered measurement and cannot observe the layers. Cross-flow phenomenon

And only the porosity, permeability and oil saturation of the whole model can be measured, and the parameters of each permeable layer cannot be determined

Therefore, it is impossible to realize the evaluation of the oil displacement efficiency of each oil layer in the combined injection layered production

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