A method for making a physical core model capable of variable viscosity injection

Abstract

The invention relates to a method for making a rock core physical model capable of variable-viscosity injection, which solves the problem that traditional indoor experiments need to continuously switch intermediate containers filled with polymers of different viscosities, resulting in complicated operating procedures. Specifically, a simulated shearer is made first. There are two flat plates that fit together and have the same through holes on them. After the two are staggered, the flow area of ​​the polymer solution changes, which will affect the If the shear degree of the polymer solution is different, the viscosity of the polymer solution will change; continue to draw the shear viscosity chart according to the polymer viscosity change in various gears, and finally arrange the simulated shearer in the core physical model, In this way, the purpose of changing the viscosity of the solution at any time during the experiment can be achieved. Because there is no need to change the intermediate container during the experiment, the error caused by changing the intermediate container is reduced, and the accuracy of the experimental result is improved.

Description

technical field [0001] The invention relates to a method for preparing a rock core physical model. Background technique [0002] Among oilfield tertiary oil recovery methods, polymer flooding in chemical flooding is a very effective way to enhance oil recovery. Polymer flooding is an tertiary oil recovery technology developed in the middle of the last century. Due to its simple technology and low cost, it is more suitable for the actual situation of most oil fields in my country and has gradually been widely used. The main mechanism of polymer is to reduce the mobility ratio through viscosity change. The viscosity of polymer solution is an important indicator affecting the effect of polymer flooding. In fact, the viscosity of polymer solution is directly related to polymer molecular weight, concentration and shear resistance. , for the actual heterogeneous reservoirs in the field, the polymer solution will first enter the larger pores after polymer injection, and then enter...

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a method for making a rock core physical model that can realize variable viscosity injection. The rock core physical model made by the method of the present invention solves the need for traditional laboratory experiments to constantly switch intermediate containers that are equipped with different viscosity polymers. For problems with complex procedures, using this core physical model to conduct polymer flooding experiments can not only reduce the workload of indoor experiments and reduce the volume of the device, but also improve the degree of simulation of field experiments. Field test provides strong experimental guarantee

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