Coalbed methane horizontal well hole collapse cave manufacturing pressure-relief mining simulation testing system

Abstract

The invention discloses a coalbed methane horizontal well hole collapse cave manufacturing pressure-relief mining simulation testing system. A coal-series stratum structure reconstruction and similarmaterial simulation subsystem simulates and constructs a coal reservoir; a pressure pulsation excitation pressure-relief simulation subsystem achieves horizontal well pressure pulsation excitation andstress release, and hydraulically displaces a coal, liquid and gas mixture to migrate towards the straight well section; an electrical simulation subsystem detects electric field distribution in similar materials; coal, liquid and gas are separated and weighed through an output object separation and detection subsystem; and a data acquisition and control subsystem detects and controls the equipment operation and implementation processes in real time. Horizontal well hole collapse cave manufacturing and stress release of the soft structure coal reservoir can be simulated, the migration characteristics of the gas, liquid and solid three phases in the pressure-relief space are simulated, the separation process of the output mixture is simulated, and the variation law of coal seam pressure relief and gas desorption, and the flow dynamic law of a complex seepage field and the horizontal well section after coal-series stratum excitation pressure relief are obtained.

Description

technical field [0001] The invention relates to a simulation test system for mining of coalbed methane, in particular to a simulation test system for mining of coalbed methane by collapsed holes in horizontal wells and creating caves for pressure relief, belonging to the field of coalbed methane mining. Background technique [0002] Structural coal refers to the coal that is affected by tectonic stress, and the original structure and structure are damaged by strong cracks, resulting in tectonic changes such as fragmentation, crumpling, and polishing. The extensive development of tectonic coal and the abundance of tectonic coal-bed methane resources are notable features of China's coal and CBM resources. Structural coal resources account for a high proportion of my country's discovered coal resources. proportion is greater. Structural coal has outstanding characteristics such as rich gas, low permeability, and softness. Most of them are coal and gas outburst coal seams. It i...

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Problems solved by technology

[0003] The method based on the theory of hydrophobic decompression and desorption gas recovery is the main method for the development of in-situ coalbed methane surface wells. Due to the extremely low permeability of structural coal reservoirs and the poor effect of hydraulic fracturing and other reconstruction methods, the theory of hydrophobic decompression and desorption gas recovery It is not suitable for structural coal reservoirs. The results of exploration and development practice also show that the coalbed methane exploration and development technology based on the theory of hydrophobic decompression desorption gas production includes SVR technology series (vertical well fracturing, U-shaped well, multi-branched horizontal well, Horizontal well fracturing, etc.), ECBM technology series (CO 2 -ECBM,N 2 -ECBM, etc.) and its composite technology cannot realize the efficient development of structural coal CBM

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