Heterogeneous multi-layer core holding unit

Abstract

The invention discloses a heterogeneous multi-layer core holding unit. A rubber barrel is arranged in a shell; a multi-layer core model is positioned in the inner cavity of the rubber barrel; a left core piercing head and a right core piercing head are pressed against the two ends of the multi-layer core model; a core chamber for accommodating the multi-layer core model is formed among the inner wall of the rubber barrel, the left core piercing head and the right core piercing head; a left fixing sleeve and a right fixing sleeve are sleeved on the left core piercing head and the right core piercing head respectively; the peripheries of the left fixing sleeve and the right fixing sleeve are connected with the two ends of the shell through an axial confining pressure sealing ring; an enclosed annular confining pressure space is formed among the outer wall of the rubber barrel, the left fixing sleeve, the right fixing sleeve and the inner wall of the shell; a liquid inlet is formed in the left core piercing head and is communicated with the core chamber; and a liquid outlet is formed in the right core piercing head and is communicated with the core chamber. By adopting the holding unit, laminational measurement of intraformational heterogeneous oil deposit is realized, and the change rule and intraformational channeling phenomenon of intraformational heterogeneous water displacing oil during mixed water injection delamination can be accurately simulated and tested.

Description

Technical field [0001] The invention relates to a simulated oilfield co-injection and layered mining test device, in particular to a heterogeneous multilayer core holder. Background technique [0002] In oil field development, the heterogeneity of the oil layer is one of the important factors affecting the development of the oil field. Especially when the oil layer is combined with water injection, the heterogeneity of the oil layer not only reduces the sweep coefficient of the oil layer thickness, but also affects the various water injection layers. The oil displacement efficiency of the oil layer has a greater impact and reduces the ultimate recovery factor. Therefore, understanding the change law of oil displacement efficiency of heterogeneous reservoirs during water injection provides a theoretical basis for adjusting development measures and improving development effects. [0003] The current research on heterogeneity is divided into intra-layer and inter-layer heterogeneity ...

AI Technical Summary

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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