Low-permeability rock gas-liquid dual-driven pressure pulse attenuation penetration test device and method

Abstract

The invention relates to a low-permeability rock gas-liquid dual-driven pressure pulse attenuation penetration test device and method. The device comprises a gas-liquid dual-driven fluid loading assembly, a confining pressure pump, a pressure chamber, a differential pressure sensor, a pressure sensor, a plurality of stop valves, a pressure regulating valve, a vacuum pump, an auxiliary heater and a constant-temperature water bath. The gas-liquid dual-driven fluid loading assembly can meet both a liquid output requirement and a gas output requirement and can be used for actively generating a relatively large pressure difference between the upstream and the downstream of low-permeability rocks, and meanwhile, the permeability and permeability coefficients of the low-permeability rocks can be rapidly measured based on a design thought of a pressure pulse attenuation method; the volume of a pipeline of the test device established by the invention is relatively small and is smaller than 300ml through actual measurement, so that the influences caused by fluctuation of an environment temperature to the volume of the pipeline are effectively reduced; and meanwhile, by combining with a thermostatic water bath and an auxiliary heater, the environment temperature can be accurately controlled, the influences caused by fluctuation of the environment temperature to the volume of the pipeline are further reduced, and finally, the measurement precision is improved.

Description

technical field [0001] The invention belongs to the technical field of low-permeability rock permeability tests, in particular to a low-permeability rock gas-liquid two-drive pressure pulse attenuation penetration test device and method. Background technique [0002] Shale gas is a kind of unconventional energy. It exists in source rocks in various states. About 50% of the free gas in shale gas can move freely, and the remaining gas mostly exists in the state of adsorption and dissolution. In addition, due to the porous and low-permeability characteristics of the reservoir matrix, it is difficult for shale gas to migrate in the reservoir matrix and thus difficult to exploit. The permeability of shale is an important index parameter that characterizes the ease of shale gas migration. Accurate measurement of shale permeability has an important impact on well logging evaluation and productivity prediction. [0003] At present, the traditional pressure differential method rock ...

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Problems solved by technology

[0005] Therefore, it is urgent to develop a new low-permeability rock permeability test device and method for the problems of long measurement time, large pipeline volume and low measurement accuracy in the existing low-permeability rock permeability test.

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