Visualized plane sand packing model for oil displacement experiments

Abstract

The invention provides a visualized plane sand packing model for oil displacement experiments. The visualized plane sand packing model comprises a bottom plate and a surface plate, wherein the surface plate is arranged at the top end of the bottom plate, a square groove for containing a packing matter is formed in the center of the bottom plate, a first thread hole and a second thread hole are clockwise formed in the side edges of the square groove, a third thread hole and a fourth thread hole are clockwise formed in the opposite edges of the side edges of the square groove, a first two-way joint is externally connected with the first thread hole, a second two-way joint is externally connected with the second thread hole, a third two-way joint is externally connected with the third thread hole, a fourth two-way joint is externally connected with the fourth thread hole, and water flow passages are respectively arranged in the inner ends of the first thread hole, the second thread hole, the third thread hole and the fourth thread hole, are communicated with the first thread hole, the second thread hole, the third thread hole and the fourth thread hole, and extend to the bottom plate of the square groove. The visualized plane sand packing model has the advantages that the visualizing degree is high, the sealing property of the surface plate and the packing sand is good, the model with small leakage rate can be filled to simulate the low-osmosis oil storage environment, the high pressure-resistant property is realized, and the visualized plane sand packing model can be conveniently connected with indoor physical simulation injection and production equipment.

Description

technical field [0001] The invention relates to a product used for indoor experiments of reservoir fluid seepage, in particular to a visualized plane sand filling model used for research on enhanced oil recovery, seepage mechanism and tertiary oil recovery effect evaluation. Background technique [0002] At present, most oil fields in our country have entered the high water cut period of secondary oil recovery. It is of great practical significance to study how to further increase the oil recovery rate and realize the full utilization of resources. [0003] At present, there are mainly four physical models in the study of enhanced oil recovery technology and seepage mechanism: (1) The physical model of cylindrical natural core and artificial cylindrical quartz sand core is one of the commonly used physical models for displacement simulation. Although the model well maintains the pore structure and mineral composition of the real formation rocks, the displacement process of t...

AI Technical Summary

Problems solved by technology

[0003] At present, there are mainly four physical models in the study of enhanced oil recovery technology and seepage mechanism: (1) The physical model of cylindrical natural core and artificial cylindrical quartz sand core is one of the commonly used physical models for displacement simulation. Although the model well maintains the pore structure and mineral composition of the real formation rocks, the displacement process of the model is invisible, and image analysis cannot be performed, so it cannot quickly and intuitively make accurate predictions about the problems in the experimental process and experimental data. judgment;

[0004] (2) Microscopic simulation transparent model, which uses micro-etching technology to etch various capillary networks or pore networks on glass. The displacement process of this model is visualized, and data acquisition and image analysis can be performed, but Due to the limitation of etching technology, the pore throats of the fabricated model are relatively large, and the physical and chemical properties of the surface are quite different from the real formation;

[0005] (3) The microcosmic model of real core slice visualization, generally using ultra-thin real core slices clamped by plexiglass, this model can better reflect the complex formation pore distribution, but the observable range is too small to reflect well Macro seepage law;

[0006] (4) Sand-included transparent model. Generally, sand is included between two pieces of glass or sand is cemented with adhesive. This model has certain visibility and can observe the water flow direction and seepage law in the water flooding process in a large range. Image processing, but its mechanical strength is low, and the sealing between the glass plate and the sand is poor, which is easy to cause water channeling

[0008] However, during the production process of the above model, since the bottom plate and the panel are sealed with a sealing strip, the pressure that the model can withstand is small, and the bottom plate and the panel are directly in contact with the sand inclusions, and the sealing between the panel and the sand inclusions is very poor , it is easy to form obvious water channeling channels at the contact interface, and the above model uses sealing strips to enclose the sand, so the permeability of the sand filling that can be obtained during the model making process is relatively high, and cannot be used to simulate low-permeability reservoirs Geological condition

Images