Method for testing acid sensitivity of shale reservoir stratum

Abstract

The invention relates to the damage evaluation field of working fluid on the reservoir stratum in reservoir stratum reconstruction and reservoir stratum protection processes in gas reservoir exploitation of shale, and especially relates to a method for testing acid sensitivity of shale reservoir stratum. In an industry standard method testing process, the method takes liquid as an experiment medium, the gas penetration capability is an important parameter for influencing the gas well productivity, the above method accords with a practical gas layer production case; when the liquid sensitivity of shale is evaluated by an industry standard method, due to low liquid permeability, flowing speed of liquid in rock core is slow, time for measuring liquid flow amount through the rock core is long, in the method provided in the invention, liquid flow amount through the rock core is not required for measuring, time is saved; when the liquid sensitivity of shale is evaluated by the industry standard method, liquid flow amount through the rock core is hardly measured, large error is generated, liquid flow amount through the rock core is not required for measuring in the invention provided in the method, and testing error is reduced.

Description

technical field [0001] The invention relates to the field of damage evaluation of the working fluid to the reservoir in the process of reservoir transformation and reservoir protection in the development of shale gas reservoirs, in particular to a method for testing the acid sensitivity of shale reservoirs. Background technique [0002] The reservoir structure of shale gas reservoirs is complex, low porosity and ultra-low permeability. The physical properties of the reservoirs are an important factor in determining the design of shale gas development schemes. In shale gas development, in order to avoid and reduce damage to the reservoir, it is especially important to design a reasonable development plan and determine the degree of fluid damage to the reservoir. In the current susceptibility evaluation of shale fluids, researchers simply follow the industry standard, and the current industry standard is in the evaluation of gas permeability less than 1×10 -3 μm 2 When the s...

AI Technical Summary

Problems solved by technology

In the current susceptibility evaluation of shale fluids, researchers simply follow the industry standard, and the current industry standard is in the evaluation of gas permeability less than 1×10 -3 μm 2 When the sensitivity of the reservoir fluid is high, there are problems such as high requirements on equipment performance, long test process, large experimental error, etc., and the gas permeability is a key parameter affecting the development of gas reservoirs, while the industry standard method uses liquid as the experimental medium, and the test is the liquid permeability

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