A coalbed methane wellbore gas-liquid two-phase flow simulation device for multi-coal seam co-production

Abstract

The invention discloses a multi-seam joint exploitation coal seam gas shaft gas-liquid two-phase flow simulation device. The simulation device comprises a recovery system connected to the top of a shaft simulation device. A reservoir simulation system is connected with a guide hole in the shaft simulation device, an adjusting system is connected to the outer side and the bottom of the shaft simulation device and used for controlling inclination of the shaft simulation device, and a data acquisition system is connected to joints between the recovery system, the shaft simulation device and the reservoir simulation system. The simulation device can simulate the physical process that under the conditions of a certain shaft length, a hole drift angle and the like, multiple seams are sequentially desorbed under the original reservoir condition after water is drained and pressure is reduced and output is generated through an annulus of a coal seam gas shaft and an oil pipe., the displacement and the casing pressure are adjusted, flow pressure and gas output data are recorded and analyzed, the characteristics of multi-seam joint exploitation coal seam gas shaft gas-liquid two-phase flow are qualitatively recognized, an optimized discharge and recovery working system is acquired, and a guidance suggestion is provided for formulation of the on-site coal seam gas well discharge and recovery working system.

Description

technical field [0001] The invention relates to a gas-liquid two-phase flow simulation device for coalbed methane wellbore in multi-coal seam co-production, and belongs to the technical field of coalbed methane drainage. Background technique [0002] Due to the common characteristics of low pressure, low permeability and low gas saturation in my country's coalbed methane reservoirs, the development of coalbed methane wells generally has low single well production and poor economic benefits. If only the method of pumping formation water in the coal seam is used to reduce the pressure of the coal seam to release the methane gas adsorbed in the coal seam without taking any measures to increase production, not only will the single well production of coal bed methane be low, but also the production of coal bed methane development wells will be low. will lose its mining value. [0003] In order to increase the output of single well of coalbed methane and obtain considerable econo...

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Problems solved by technology

[0004] 1. Due to the differences in reservoir pressure, coal rank, gas content and other parameters between the coal seams of multi-layer co-production CBM wells, interlayer interference often occurs in the gas-liquid two-phase flow stage

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