Simulation test method for production of vertical wells in multi-layer stacked gas-bearing system

Abstract

The invention discloses a multiple superposed gas-bearing system vertical well mining simulating test method, which comprises the following steps of preparing for test, loading stress, absorbing gas, mining coal bed methane, and finishing single test and other tests in the same group. Inner bottom permeable plates of a test specimen box adopted by test are arranged in a partioning way; a gas flow channel is arranged under each permeable plate; an adopted extraction pipe comprises a plurality of inner pipes corresponding to the permeable plates in a one-to-one correspondence way; during briquette molding, coal beds in the test specimen box correspond to the permeable plates in a one-to-one correspondence way, and similar materials are arranged between each two adjacent coal beds so as to be used for simulating a rock stratum. Therefore, a new simulating test method is provided aiming at a multiple superposed gas-bearing system vertical well, so that single-layer sequential mining simulation and multi-layer progressive mining simulation can be carried out conveniently, different gas contents can be set for different coal beds according to the needs, a current situation can be simulated more realistically, and an experimental basis is conveniently provided for scheme selection of multiple superposed gas-bearing system vertical well mining.

Description

technical field [0001] The invention belongs to the technical field of coalbed methane mining simulation tests, and in particular relates to a mining simulation test method for a vertical well of a multi-layer stacked gas-bearing system. Background technique [0002] At present, with the increasing demand for energy and the increasing shortage of conventional oil and gas resources due to sustainable economic development, countries all over the world are actively looking for and developing new energy sources to make up for the gap in conventional oil and gas resources. Coalbed methane (commonly known as gas) is one of the main factors restricting the safe production of coal mines, but it is also a high-quality energy source that can be used in many fields such as power generation, heating, and chemical industry. Therefore, the rational development of coalbed methane resources can not only greatly reduce the occurrence of mining accidents, but also help reduce the national eco...

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Problems solved by technology

[0005] Traditional coal and gas drainage simulation test chambers and drainage pipes are designed for single-layer gas-bearing systems, and cannot simulate multi-layer stacked gas-bearing systems, nor can they achieve layered drainage of vertical wells in multi-layer stacked gas-bearing systems

The invention patent with the application number "201310025098.1" provides a "multi-field coupled coalbed methane extraction simulation test method". The method and equipment can only be used for simultaneous mining of multi-coal seams, and cannot be used for single-layer sequential mining or progressive mining tests, and cannot observe the respective gas flows of different coal seams, which is not conducive to the study of the mutual influence between different coal seams

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