Coal reservoir fracture gas and water conductivity dynamic change simulation testing device

Abstract

A coal reservoir fracture gas and water conductivity dynamic change simulation testing device comprises a coal reservoir gas and water supply system, a coal reservoir fracture simulation system, a water and gas separation measurement system and a data monitoring collection system. An outlet of the coal reservoir gas and water supply system is connected with an inlet of the coal reservoir fracture simulation system, and an outlet of the coal reservoir fracture simulation system is connected with the water and gas separation measurement system. The coal reservoir fracture gas and water conductivity dynamic change simulation testing device can simulate the stressed state of coal reservoirs, can accurately test changing of the coal reservoir fracture conductivity under different confining pressures, at different drainage stages, with different fracture lengths and different fracture widths and in fracture combinations, and provides theoretical basis for the coal-bed gas well drainage working system; and simulates the drainage process of coal-bed gas wells, can distinguish paths of water and gases in coal beds under conditions of different fracture combinations, different pressures and the like in the coal-bed gas well drainage process, and provides theoretical support for researching the coal-bed gas well aerogenesis mechanism.

Description

Technical field [0001] The invention belongs to the technical field of safe production of coalbed methane, and in particular relates to a dynamic change simulation test device for coal reservoir fissure gas and water conductivity. Background technique [0002] CBM is mainly stored in coal reservoirs in an adsorbed state. At present, surface CBM mainly reduces the pressure of coal reservoirs by pumping water from coal reservoirs, and desorption of CBM is produced. Differences in the size, length, crack combination of different lengths and widths of coal reservoirs, the flow distance of water in the coal seam, and the selection of the flow process path will all affect the amount of water produced during the drainage of coalbed methane wells. The amount of water produced will affect the pressure reduction in the gas production range of the CBM well to a certain extent, and ultimately affect the gas production of the CBM well. [0003] The coal reservoir is in a three-dimensional spac...

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Problems solved by technology

But at present, there is no relatively mature device that can dynamically monitor the change of fracture conductivity in the process of drainage under different conditions.

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