A physical simulation device and experimental method for multi-coal seam coalbed methane well drainage

Abstract

The invention provides a physical simulation device for multiple seam gas well drainage and production. The device comprises a controlling computer, an experimental table, a hydraulic cylinder support rack, a boosting water pump, a vacuum pump, a first level coal seam methane recycling bottle, a second level coal seam methane recycling bottle, a methane gas supply cylinder, a helium gas storage bottle, a hydraulic cylinder, a coal seam boosting water tank, a water returning tank, a thermal water tank and a coal seam boosting chamber. The side portion of the coal seam boosting chamber is connected with a water gas multi-purpose pipeline. A three-channel gas recycling pipe is arranged in the coal seam boosting chamber. The invention further discloses an experimental method of the multiple seam gas well drainage and production. According to the physical simulation device for multiple seam gas well drainage and production and experimental method thereof, the coal samples with physical property parameters similar to the coal seam to be simulated is selected to make the experiment results more accurate, the fracture treatment is imposed on the coal sample before the experiment to form an artificially modified seam network in the condition of a reservoir stratum. The device and method can be directly used for the simulation of the water drainage and gas mining in multiple seams, provide the basis for predicting the drainage and mining effects in actual production process and making reasonable drainage and mining regulation.

Description

technical field [0001] The invention belongs to the technical field of coal bed gas drainage, and in particular relates to a physical simulation device for drainage and production of multi-coal seam coal bed gas wells and an experimental method thereof. Background technique [0002] my country is rich in coalbed methane resources, and the coalbed will experience more complex tectonic movements during the deposition process. When the coal rank is high, the permeability of the coalbed is low, and at the same time, it is affected by the pressure sensitivity of the reservoir during the mining process. Drainage technology and the establishment of a suitable drainage system have received extensive attention. [0003] According to the survey, the currently published patents in related fields are mainly aimed at the design of underground drainage and gas recovery devices or methods, and there has never been a device for laboratory simulation of coalbed methane well drainage. In the ...

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Problems solved by technology

Because the coal samples were not subjected to fracturing treatment before the experiment, the coal samples could not be very close to the state of the coal reservoir (temperature, pressure and water content), resulting in large errors in the experimental results

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