Quick-type alternated cooling and heating device for simulating reconstruction of coal seam gas reservoir

Abstract

The invention discloses a quick-type alternated cooling and heating device for simulating the reconstruction of a coal seam gas reservoir. A columnar core chamber, a confining-pressure loading cavity and an axial-pressure loading cavity are arranged in a core clamping device. A columnar hollow coal core is arranged in the columnar core chamber, and a heat and coldness resistant and glass-sealed cavity is arranged in the hollow coal core. The confining-pressure loading cavity and the axial-pressure loading cavity are both connected with an axial-pressure and confining-pressure loading system. A pipeline of a gas loading device of a hole permeability testing system is communicated with the columnar core chamber, and a pipeline of a gas collection device is sequentially connected with a flowmeter and the columnar core chamber. According to the quick-type alternated cooling and heating device for simulating the reconstruction of the coal seam gas reservoir, a microwave body is used for heating, liquid nitrogen is used for cooling, and the construction processes of deformation, displacement, generation, development and the like of coal internal hole fissures under the environment where high temperature and low temperature continuously change can be effectively simulated. Original seepage characteristics of the reservoir can be simulated through axial-pressure and confining-pressure loading. By providing quick temperature-changing construction with different frequencies and ranges, the sensitivity of the coal reservoir to temperature changing can be effectively tested, and experimental basis is provided for the field application of the temperature-changing construction of the reservoir.

Description

technical field [0001] The invention relates to the technical field of coalbed methane reservoir reformation, in particular to a simulation device for reservoir reformation through temperature changes. Background technique [0002] Coalbed methane reservoirs in most areas of my country are ultra-low permeability or tight reservoirs, and the recovery rate of coalbed methane is extremely low, so artificial enhancement measures must be taken. At present, hydraulic fracturing is the most commonly used reservoir stimulation technology for coalbed methane development, but hydraulic fracturing reservoir stimulation will inevitably produce coal powder to block the seepage channel of the reservoir, and the injection of fracturing fluid will also damage the reservoir, resulting in Reservoir permeability decreases, limiting the desorption of coalbed methane. [0003] Compared with conventional reservoir stimulation methods (such as hydraulic fracturing, etc.), the reservoir high-tempe...

AI Technical Summary

Problems solved by technology

However, this application in coalbed methane reservoir transformation is still a new field. There is no relevant experimental simulation device that can accurately simulate the variable temperature transformation process of coal reservoirs, let alone accurately evaluate the impact of variable temperature reservoir transformation technology on coal reservoirs. The synergistic effect of porosity and permeability seriously restricts the mechanism research of variable temperature reservoir stimulation technology and its application in coalbed methane development

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