Evaluation device and evaluation method for stability of acid fracturing high-temperature temporary plugging agent

Abstract

The invention discloses a device for evaluating the stability of an acid fracturing high-temperature temporary plugging agent, which comprises a liquid supply part for providing mixed acid liquid and temporary plugging agent solution, and further comprises a testing part, the testing part comprises a rock plate holder, the rock plate holder comprises a high-permeability rock plate, a low-permeability rock plate and four clamping plates, the device is further provided with a heating part and a pressurizing part, and the device further comprises a power part, a first flow meter is arranged at an outlet of the high-permeability rock plate, and a second flow meter is arranged at an outlet of the low-permeability rock plate. The evaluation device can complete the whole process from mixing of an acid solution and a temporary plugging agent solution to testing of the stability of the temporary plugging agent, the heating part and the pressurizing part are used for heating and pressurizing, and the high-temperature pressure condition of a reservoir is simulated. The rock plate clamping device clamps the high-permeability rock plate and the low-permeability rock plate, whether the temporary plugging agent blocks the high-permeability rock plate or not can be evaluated according to the outlet flow of the two rock plates within the same time, and then the stability of the temporary plugging agent is evaluated. In addition, different temporary plugging agents can be evaluated, and transverse comparison of the effects of different temporary plugging agents is achieved.

Description

technical field [0001] The invention relates to the technical field of oil recovery engineering, in particular to an evaluation device and evaluation method for the stability of an acid fracturing high-temperature temporary plugging agent. Background technique [0002] When crude oil is extracted from carbonate formations, it is necessary to modify the reservoir. The acid liquid is injected into the oil well to be stimulated at a level higher than the fracture pressure of the formation, and the acid solution will produce uneven etching, resulting in high conductivity channels. Acid-etched fractures will pass through the near-wellbore zone, and the seepage pattern of reservoir fluid will change from radial flow to bilinear flow. [0003] Due to the heterogeneity and high temperature of the reservoir, the acid liquid cannot be evenly distributed to each vertical layer when it enters the reservoir. This inhomogeneity leads to the inability of fractures to fully communicate wi...

AI Technical Summary

Problems solved by technology

The current experimental method does not achieve the effect of integrated work. This patent adopts an integrated comparative study, which can well compare the temporary plugging effects of different temporary plugging agents at high temperatures under acid pressure

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