Anisotropic two-dimensional visual sand filling model in simulation layer and two-dimensional visual seepage experimental device

Abstract

The invention discloses an anisotropic two-dimensional visual sand filling model in a simulation layer and a two-dimensional visual seepage experimental device. The two-dimensional visual sand filling model includes a bottom board and a cover board. The bottom board and the cover board are both made of transparent material. The surfaces of the bottom board and the cover board are in sealing fit and a sealing rubber pad is arranged between the bottom board and the cover board. A cavity between the sealing rubber pad and the cover board is an enclosed cavity and a cavity between the sealing rubber pad and the bottom board is a filling cavity. The bottom board is provided with three sand filling grooves in parallel. The sand filling grooves are arranged in the width direction of the bottom board. One end of the three sand filling grooves is provided with liquid inlets while the other end of the three sand filling grooves is provided with liquid outlets. According to the invention, the two-dimensional visual seepage experimental device includes a pressure providing module, a pressure data collecting module, an image collecting module, an injection module, the two-dimensional visual sand filling model and a metering module. When using the model and the experimental device provided by the invention, core sandstone particles or quartz sand particles of different particle sizes are put into the sand filling grooves, so that permeability difference is formed among different layers. Therefore, different anisotropic oil deposit can be simulated by different sand filling combinations.

Description

technical field [0001] The invention relates to an experimental device for simulating fluid seepage in oil reservoirs, in particular to a two-dimensional visual sand filling model and a two-dimensional visual seepage experimental device for simulating intralayer heterogeneity. Background technique [0002] The core of reservoir research is reservoir heterogeneity. Reservoir heterogeneity research is an important basic work in the geological research of oil and gas field exploration and development. At present, many oil fields in China have entered the medium-high water cut period and production reduction period, and this research is particularly important. Reservoir heterogeneity reduces the sweep coefficient of water flooding or chemical flooding, resulting in lower ultimate recovery and resulting in ineffective circulation of water injection or injection agents. Therefore, understanding the oil displacement efficiency and seepage law of water flooding or chemical flooding...

AI Technical Summary

Problems solved by technology

The current methods are as follows: ①Compress the rock cores with different permeability and cement them with epoxy resin to form a heterogeneous rock core. The disadvantage is that it cannot be observed directly, and the overlying pressure of the formation cannot be simulated. It cannot realize layered measurement and can only measure multiple layers. The overall oil displacement efficiency of the core model changes; ②Cores with different permeability are pressed and displacement experiments are carried out in multi-layer core holders. In some special multi-layer core holders, it is possible to simulate oilfield co-injection and delamination The change law of heterogeneous water flooding oil in the middle layer is exploited, but the visualization problem cannot be solved, and the seepage change of the fluid in the heterogeneous porous medium in the layer cannot be directly observed

Another solution to the displacement experimental model is to use a visual flat plate sand inclusion model or a glass etching model to solve the visualization problem. Visualized flat-slab sand-fill model and glass-etch model for the study of intralayer heterogeneity

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