Visualization experiment device and method for profile control performance evaluation of weak gel of fractured reservoir

Abstract

The invention discloses a visualization experiment device and method for profile control performance evaluation of weak gel of a fractured reservoir. The experiment device comprises a visualization crack module, a water transport intermediate container, a gel transport intermediate container, a displacement pump, a liquid container connected with a liquid inlet of the displacement pump, a measuring cylinder connected with a liquid outlet of the crack module and a vacuum pump for vacuumizing the crack model. The experiment method comprises the following steps: 1, carrying out a dynamic displacement experiment on weak gel in a crack; 2, replacing crack models with different crack widths, and carrying out injection performance and plugging performance evaluation experiments on the weak gel in a plurality of cracks under the conditions of different weak gel viscosities and injection speeds; 3, carrying out data processing. The visualization experiment and device are reasonable in design, favorable in visuality and good in simulation effect, provides convenience for observing the displacement and plugging processes of the weak gel and can be used for testing and recording the injection performance, the plugging performance and the plugging state of the weak gel in the cracks under the conditions of different weak gel properties and different crack widths.

Description

technical field [0001] The invention belongs to the technical field of dynamic physical simulation experiments of increasing production and injection to enhance oil recovery in an oil production chamber, and in particular relates to a visual experimental device and an experimental method for evaluating the performance evaluation of weak gel profile control in fractured oil reservoirs. Background technique [0002] Profile control and water shutoff has become an inevitable and important task in the process of water injection development of fractured ultra-low permeability reservoirs. This type of reservoir has extremely low permeability, high water injection pressure, and clogging and pollution around the well; the heterogeneity is very serious, natural fractures and artificial fractures are interlaced, and the injected water rushes along the high-permeability channels of the fractures, and the sweep coefficient is very low. For profile control and water plugging in such rese...

AI Technical Summary

Problems solved by technology

In recent years, with regard to the delayed cross-linking gel deep profile control technology, more research has focused on the formulation, performance evaluation and mine field tests of profile control agents. There are deficiencies in mechanism research and other aspects, especially the lack of basic, accurate, stable and visualized indoor simulation experimental devices and effective experimental methods

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