Analog evaluation device for evaluating damage of coalbed methane reservoir polluted by external fluid

Abstract

The invention discloses an analog evaluation device for evaluating damage of a coalbed methane reservoir polluted by external fluid for different purposes in a laboratory. The analog evaluation device comprises an injection system, a constant temperature system, a control system, a metering system and a computer acquisition processing system; the injection system comprises a gas source, a gas boosting pump, a safety valve, a liquid source and an injection pump; the constant temperature system comprises a constant temperature cabinet or pool, a balancing tank and a multifunctional sample cavity; the control system comprises a pressure control module, a temperature control module, a gas flow control module, a liquid flow control module and a vacuum pump control module; the metering system comprises a precise pressure metering module, a precise gas metering module, a precise liquid metering module, a precise temperature metering module and an acquisition metering module of a coalbed methane module; and the computer acquisition processing system comprises a temperature sensor, a pressure sensor and a computer, and data which are acquired by the temperature sensor and the pressure sensor are directly inputted into the computer to be processed.

Description

【Technical field】 [0001] The invention relates to a laboratory device of a coal bed gas reservoir, which relates to a laboratory evaluation of the coal bed gas desorption and seepage capacity after simulating different forms of coal bed gas reservoirs polluted by external fluids for different purposes. 【Background technique】 [0002] Coalbed methane, or coalbed methane, has a molecular diameter of 0.38nm and is stored in the pores of coal reservoirs in the form of a monomolecular layer. The pores are small and dense, and most of them are nanoscale. Coal rocks are organic rocks, composed of macromolecular structures, and the side chain functional groups of the macromolecules have certain activities. When foreign fluid invades, it is very easy to react with these active functional groups. The macromolecular structure of coal is extremely complex, and the chemical composition of foreign fluids involved in the development of coalbed methane reservoirs is extremely complex. Its ...

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Problems solved by technology

[0009] Therefore, foreign coalbed methane reservoir damage evaluation methods are not fully applicable to domestic coalbed methane reservoir damage evaluation, and research on coalbed methane reservoir damage and evaluation techniques must be carried out according to the characteristics of my country's coalbed methane reservoirs.

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