Sealed and fixed measurement apparatus for measuring impedance characteristics of compacted rock

Abstract

The invention relates to a sealed and fixed measurement apparatus for measuring the impedance characteristics of compacted rock. The sealed and fixed measurement apparatus comprises a rock core holder used for circumferential mechanical sealing and fixation of a to-be-measured rock core, a measuring cell used for holding testing liquid and a signal measuring and processing device, wherein the rock core holder comprises a sealing cap, a sealing cartridge and a sealing pedestal successively connected from top to bottom; the center of the sealing cap is provided with a through hole with a diameter less than the diameter of the to-be-measured rock core; the sealing cartridge comprises a shrinkable metal coat and a rubber sleeve arranged in the metal coat and used for accommodating the to-be-measured rock core; a metal electrode is arranged at the center of the sealing pedestal; the bottom of the metal electrode is connected with an electrode lead directly passing through the center of the sealing pedestal; a reference electrode and a counter electrode are arranged in the measuring cell and form an electrochemical tri-electrode system together with the metal electrode; and the signal measuring and processing device comprises an electrochemical work station and a computer, the electrochemical work station is separately connected with the reference electrode, the counter electrode and the electrode lead, and the computer is connected with the electrochemical work station.

Description

technical field [0001] The invention relates to a sealing and fixing device, in particular to a sealing and fixing measuring device for measuring the impedance characteristic of compact rock. Background technique [0002] At present, the development of unconventional natural gas reservoirs relies on large-scale hydraulic fracturing stimulation to obtain industrial oil and gas flows. During and after hydraulic fracturing, a large amount of fracturing fluid interacts with reservoir rocks, causing a series of changes in the physical properties of reservoir rocks. The study of this water-rock interaction is of great significance for a series of construction and development processes such as understanding the physical property changes inside reservoir rocks, guiding fracturing operations, and designing fracturing fluid systems. Unconventional oil and gas is a typical marginal resource, and its pore size has reached the micro-nano level. The traditional petrophysical testing and ...

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Problems solved by technology

[0004] However, there is still a lack of corresponding research on the AC impedance characteristics of unconventional reservoir cores, and there is no special device for testing the AC impedance spectrum of unconventional reservoir cores.

The existing AC impedance spectroscopy measurement device is generally an open system. The test object and electrodes are placed in the solution. The test object is usually treated with some materials such as resin for waterproofing. This chemical treatment will change the physical properties of the core, which is not satisfactory. Unconventional Reservoir Core Testing Requirements

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