Test method for hydraulics size of shear flow polymer and test device thereof

Abstract

Provided are a test device and a test method for the hydraulics size of shear flow polymer. The device comprises a liquid barrel, a shear flow generator, a filter liquid collection container and a support for supporting the liquid barrel and the shear flow generator, wherein the liquid barrel is provided with a piston matched with the inner diameter of the liquid barrel, the lower end of the liquid barrel is communicated with the shear flow generator, the shear flow generator is composed of an upper chuck, a lower chuck, an upper layer filter membrane and a lower layer filter membrane, the upper layer filter membrane and the lower layer filter membrane are arranged on the lower chuck, a liquid outlet pipe is positioned at the lower portion of the lower chuck, a control valve is positioned on the liquid outlet pipe, and the filter liquid collection container is positioned under the liquid outlet pipe. The method using the test device comprises the steps of preparing polymer solution, filtering and drawing relation curve between viscosity retention rate and corresponding hole diameter of the lower layer filter membrane. When the viscosity retention is 70%, the hole radius of the corresponding lower layer filter membrane is the average hydraulics radius of the shearing rate.

Description

technical field [0001] The invention belongs to the field of polymer size testing, and in particular relates to a method for testing polymer hydraulic dimensions under shear flow and a testing device thereof. Background technique [0002] When the hydration molecules of the polymer oil displacement agent flow through the porous medium, the hydration molecules of the oil displacement agent are naturally selected by the size of the pore throat of the reservoir. The phenomenon that the agent blocks the formation, which leads to an increase in the injection pressure. Therefore, when designing a polymer flooding scheme, the polymer flooding agent must be compatible with the pore throat size of the reservoir medium, and the accurate measurement of the hydraulic size of the polymer flooding agent in different environments is the key to the study of polymer flooding. It is the key and prerequisite for the compatibility of pore throat size between the agent and the reservoir medium....

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Problems solved by technology

However, this method has the following disadvantages: ① When the polymer solution passes through the micropores of the single-layer filter membrane, there is a cross flow, which causes the flow field between adjacent micropores to interfere with each other. It is difficult to control the flow state through the micropores during the test, and the test is stable. ② Since the filtration rate is controlled by constant pressure during filtration, the flow rate and shear rate of the polymer solution will change with the change of the filter membrane pore size, and the hydraulic size of the polymer will change when the shear yield flow However, this method cannot test the hydraulic size of the polymer at a certain shear flow rate. Therefore, the size of the polymer oil displacement agent tested by this method is different from the real flow form of the oil displacement agent in the reservoir medium. The compatibility research based on this is also inconsistent with the real situation; ③The mass concentration change of the polymer solution is directly used to reflect the interception and passage of the polymer on the filter membrane, because the concentration of the polymer solution used in the test is low , the test error is large

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