Rapid characterization method for sand-carrying capacity of viscoelastic fluid

Abstract

The invention provides a rapid characterization method for the sand-carrying capacity of a viscoelastic fluid. The method comprises the following steps: preparing a viscoelastic fluid solution, and measuring and obtaining a stress curve of the viscoelastic fluid solution; obtaining a viscous modulus curve and an elastic modulus curve of the viscoelastic fluid solutions with different concentrations under different frequencies according to the stress curve; according to an intersection point X value of the viscous modulus curve and the elastic modulus curve and a corresponding elastic modulus G'value under the frequency of 1Hz, obtaining the sand-carrying capacity of the viscoelastic fluid, wherein the smaller the value of the intersection point X is or the larger the value of the elastic modulus G'corresponding to the frequency of 1Hz is, and the higher the sand-carrying capacity is. According to the method, the experiment can be simplified, the workload is reduced, the practicability is wide, the sand-carrying performance of different types of viscoelastic fluids can be rapidly and comprehensively evaluated, and the practicability and accuracy are high; and the main mechanism and the viscoelastic contribution value of the sand-carrying capacity of the viscoelastic fluid can be revealed.

Description

technical field [0001] The invention belongs to the technical field of fracturing fluid evaluation, and relates to a rapid characterization method for viscoelastic fluid sand-carrying ability. Background technique [0002] Unconventional oil and gas such as shale oil and gas are currently one of the most important energy resources in the world; for the exploitation of unconventional oil and gas reservoirs, it is necessary to use fracturing fluid to carry sand and create fractures. At present, the sand-carrying performance of indoor fracturing fluids is mainly studied through static and dynamic sand-carrying experiments: (1) Static sand-carrying experiments are carried out using measuring cylinders and other equipment, mainly including single-particle, multi-particle and settlement tests at a certain sand concentration, but cannot be completely It represents the sand-carrying capacity of the fracturing fluid, which is affected by many factors and cannot simulate the real situ...

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Problems solved by technology

However, at present, there is still a lack of rapid characterization methods for the sand-carrying performance of viscoelastic fluids such as viscous slick water.

[0004] At present, some prior art reports have mentioned the influence of rheology on sand-carrying ability, which characterizes the sand-carrying mechanism by testing the viscoelastic modulus. For example: Zhang Yun et al. explored a low The sand-carrying performance of molecular polymer fracturing fluids, discussed the elastic modulus, viscous modulus and frequency change curve, and then revealed its sand-carrying ability; Liu Tongyi et al. To characterize the sand-carrying ability of a slickwater fracturing fluid; however, these existing reports are based on a large number of rheological and sand-carrying experiments, the workload is huge, and it is not clear how much viscoelastic modulus can carry sand , that is, there is a lack of a standard for the size of the viscoelastic modulus that can carry sand, in order to reduce the workload

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