Gas and water flow condition and effect simulation device of coal bed gas well discharging and mining process

Abstract

The invention discloses a gas and water flow condition and effect simulation device of a coal bed gas well discharging and mining process. The simulation device comprises a closed cylinder, a grid-shaped fracture simulation pipeline for simulating coal reservoir fracture grids is arranged in the cylinder, the front end of the fracture simulation pipeline is connected with a delivery pipeline for delivering gas and / or liquid to the fracture simulation pipeline, the fracture simulation pipeline is further connected with an air pressure blocking pipeline, a piston is arranged on one end of the air pressure blocking pipeline connected with the fracture simulation pipeline, the back end of the fracture simulation pipeline is connected with an evacuating device for simulating discharging and mining control, and the cylinder is connected with a high pressure gas delivery pipeline used for providing pressure for the fracture simulation pipeline. Positive effects and negative effect of fracture compression and expanding are caused by gas and water flow conditions, and the simulation device can simulate the gas and water flow conditions, flowing paths and positive effects and negative effect of fracture compression and expanding caused by gas and water flow conditions during discharging and mining under different fracture grid combinations, different outer differential pressures and different coal reservoir adsorption energies.

Description

technical field [0001] The invention relates to a gas and water flow state and effect simulating device in the drainage and production process of a coal bed gas well. Background technique [0002] Coal bed methane and coal are a pair of twin brothers bred by the plant mother. Coal bed methane, as a new type of clean energy, has attracted widespread attention in recent years, and people have actively invested in its exploration and development. Coal bedrock is the main reservoir where coalbed methane occurs, and coalbed methane mainly exists in the coal seam in an adsorbed state. To extract the methane gas that exists in the coal seam, it must be between the coal of the adsorbed methane gas and the external space. There is a certain energy difference between them, under the action of the energy difference, the adsorbed methane gas is transformed into free gas, which migrates out along the fracture channels of the coal seam. At present, surface coalbed methane wells mainly re...

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Problems solved by technology

[0003] The purpose of the present invention is aimed at the inability to correctly know whether the gas and water can flow and the state of the flow of coalbed methane wells under the complex and changeable coal reservoir fissure network, resulting in the implementation of coal reservoir reconstruction measures and the formulation of drainage and production work systems In order to solve the problems of blindness and other problems, a simulation device for the positive and negative effects of the gas and water flow state and the fracture compression or opening caused by the coalbed methane well drainage process has been developed, which can simulate different fracture network combinations, different internal and external pressure differences, The flow state and flow path of gas and water during drainage under different adsorption energies of coal reservoirs and the positive and negative effects of compression or opening of fractures caused by them are the changes in pressure transfer, gas and water production sources, Provide theoretical guidance for accurate prediction of water production and gas production

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