Secondary Shear Method for Determination of Performance Parameters of Polymer Solutions for Oil Displacement

Abstract

The invention relates to a secondary shearing method for testing performance parameters of an oil displacing polymer solution. The method comprises the following steps: (1) preparing a to-be-tested polymer solution a0, wherein the to-be-tested polymer solution a0 is a solution of oil field water and polymer dry powder which are mixed at random ratio; (2) primarily shearing the to-be-tested polymer solution a0 by using a WARING stirrer to obtain a polymer solution a1 after primary shearing, and testing the viscosity, the condensate dimension, the microstructure, the rheological property, the resistance coefficient, the residual resistance coefficient and the oil displacing effect of the polymer solution a1; and (3) secondarily shearing the polymer solution a1 by using a shearing simulation device for immediate vicinity of a wellbore to obtain a polymer solution a2 after secondary shearing, and testing the viscosity, the condensate dimension, the microstructure, the rheological property, the resistance coefficient, the residual resistance coefficient and the oil displacing effect of the polymer solution a2.

Description

technical field [0001] The invention relates to an experimental method for measuring the performance parameters of the polymer solution for oil displacement, in particular to a secondary shear method for measuring the performance parameters of the polymer solution for oil displacement. Background technique [0002] With the continuous development of economies around the world, the demand for oil and gas resources is also increasing day by day. In the absence of more proven oil and gas reserves, enhancing oil and gas recovery is the only effective way. Polymer flooding is the most widely used method in enhancing oil recovery. Improve oil recovery by injecting polymer solution into the formation to improve mobility ratio and increase swept volume. The biggest problem faced in the process of polymer solution injection into the formation is shear degradation. The shear degradation of the polymer solution directly leads to the degradation of the performance of the polymer solut...

AI Technical Summary

Problems solved by technology

Among them, the shearing of the polymer solution by the WARING agitator is pure mechanical shearing, which is different from the shearing mode of the polymer solution in the formation, and the shearing of the polymer solution does not conform to the actual situation of the reservoir; However, the shearing of the polymer solution by the near-wellbore simulation experiment device is in line with the reality of the near-wellbore formation, but it can only simulate the shearing of the polymer solution in the near-wellbore formation, and cannot fully reflect the polymerization. The shearing of the polymer solution can be simulated by core shearing to a certain extent, but the shear rate that can be simulated by this shearing method is not continuously changing, and it is only suitable for simulating a certain point in the formation. cut

[0004] To sum up, the current shearing methods involved in indoor simulation are all carried out under a single shearing mode, which cannot fully reflect the shearing experienced by the polymer solution during the injection process. There is still a certain difference between the actual values

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