A system and method for measuring the permeability of low-permeability rock ore particles

Abstract

The invention provides a permeability measurement system and method for low-permeability rock ore particles. The permeability measurement system comprises a high-pressure air source device, a reference cavity, a suction and exhaust valve and two symmetrically-arranged sample side devices; each sample side device comprises a sample cavity, an isolation valve and a balance valve, the sample cavity is communicated with the reference cavity through a circulation pipeline to receive high pressure air transmitted from the reference cavity; the isolation valve is arranged at the position of the circulation pipeline and close to the sample cavity; the balance valve is arranged at the position of the circulation pipeline and close to the reference cavity; the two sample cavities are respectively used for accommodating to-be-detected low-permeability rock ore particles and impermeable solids, the impermeable solids and the to-be-detected low-permeability rock ore particles are identical in particle size and volume, and the sample side devices are arranged at the same height. The permeability measurement system is simple and easy to maintain, small in dimension and high in safety; the permeability measurement system and method has the advantages that credibility and measurement precision of permeability of low-permeability rock ores are remarkably increased.

Description

technical field [0001] The invention relates to the technical field of rock ore permeability measurement, in particular to a permeability measurement system and method for low-permeability rock ore particles. Background technique [0002] Unconventional natural gas resources represented by tight gas, coalbed methane and shale gas are currently the key exploration and development targets of the natural gas industry in various countries in the world. Permeability and diffusion coefficient are important physical properties of porous media in rocks and mines. They quantitatively characterize the migration ability of reservoir gas in the pores of rocks and mines, and are key parameters for reservoir evaluation. Reservoir rocks of unconventional natural gas reservoirs have extremely low porosity (usually less than 10%), among them, shale and coal have a large number of micro- and nano-pores, and their matrix permeability is as low as Nadaxi level, which has high porosity. Difficu...

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Problems solved by technology

[0005] In summary, the current experimental technical scheme based on the pressure decay of rock ore particle samples cannot separate and shield the interference of the particle accumulation bed and pipeline dead volume on the initial pressure decay curve, and it cannot be concluded that the measured data are completely from the measured sample itself, nor can it be The processing method of experimental data is limited, which makes the reliability of the permeability measurement result of the sample low

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