A semi-sealed two-dimensional seepage model and its manufacturing method

Abstract

A semi-sealed two-dimensional seepage model and a manufacturing method thereof. It includes a model body, which is characterized in that: the model body adopts a "sandwich" structure, two glass plates of the same size are placed parallel to the upper and lower directions, and a closed hard ring is placed between the two glass plates. There are high-permeability zones and mudstone zones distributed in the gap, and the mudstone zone and hard sponge strips surround the high-permeability zone; a region of the hyperpermeability zone extends to the place close to the hard sponge strip, and this zone of the hyperpermeability zone is the model The filling point in the high-permeability zone is large particle filling, and the filling in the mudstone area is small particle filling; the two glass plates are clamped around by C-shaped clamps; the main body of the model is immersed in water. This model can truly simulate the flow of oil, gas and water in formation scenarios.

Description

technical field [0001] The invention relates to the technical field of oil and gas exploration and development experiments, in particular to a two-dimensional seepage model and a realization method. Background technique [0002] The two-dimensional seepage model has the characteristics of intuitive visualization, and has been widely used in understanding the mechanism of oil and gas migration and accumulation and in water injection development experiments. At present, the production methods of two-dimensional models are generally divided into two categories: "wet filling method" and "dry filling method". In the process, the three sides of the model are closed first, and the remaining one side is opened. The model is filled with water through the open side, and then the slurry mixed with particles and water is evenly filled into the model, and finally the open side is closed. The advantages of this method The model after filling is a saturated water model, which saves the mo...

AI Technical Summary

Problems solved by technology

At present, the production methods of two-dimensional models are generally divided into two categories: "wet filling method" and "dry filling method". In the process, the three sides of the model are closed first, and the remaining one side is opened. The model is filled with water through the open side, and then the slurry mixed with particles and water is evenly filled into the model, and finally the open side is closed. The advantages of this method The model after filling is a saturated water model, which saves the model saturation step and has relatively high efficiency. Its disadvantage is that it is difficult for human intervention to settle the granular material in the model during the filling process, so it is suitable for making a homogeneous two-dimensional seepage model

The dry filling method can make a complex homogeneous model. The method of making this type of model is to lay boundary constraints on the base plate first, then divide the boundary surrounding area into different areas with dividers, and fill different granular materials in different areas, so that The heterogeneous two-dimensional seepage model can be made. The key point of this kind of model is that it is difficult to control the amount of filling granular material. When the filling is insufficient, the model will move and be saturated with water, and the segmented area will be deformed and destroyed. The material supports the glass plate, which will cause the model to fail to seal, so the success rate of this type of model is low

The two-dimensional seepage models produced by the dry filling method and the wet filling method have fixed liquid injection ports and liquid discharge ports. The injection fluid is injected from the liquid injection ports, and the displaced fluid in the model is discharged from the liquid discharge ports. The flow and displacement of the gas flow are limited and constrained by the positions of the liquid outlet and the liquid injection port, but in actual formations, only the oil phase and the gas phase are restricted to the high permeability zone by the capillary force, while there is no capillary force inside the water phase. , so it can not only flow in the reservoir, but also pass through the caprock and interlayer, which leads to the inconsistency between the flow area and mode of the water phase in the current two-dimensional seepage model and the actual formation

Images