A high temperature and high pressure triaxial test device and method for rock mass containing organic matter

Abstract

The invention relates to an organic rock mass containing high-temperature and high-pressure triaxial test device and method. The device comprises a high temperature pressure chamber, an upper pressure guide head, a lower pressure guide head and a lateral pressure solid, wherein the middle part of the lower pressure guide head is provided with a center hole; a high temperature block-proof net is arranged between the lower pressure guide head and an organic rock mass test sample; the external part of the lower pressure guide head is provided with a collection bottle arranged in a condensed water tank and a gas collection bottle; the collection bottle is provided with a gas outlet pipe; and the gas outlet pipe is provided with a gas inlet value. The method comprises the following steps of: heating the organic rock mass test sample under a buried depth of 400-600m of a preset pressure, heating from the room temperature, and performing heat preservation for two hours with every increase of50 DEG C until the organic rock mass test sample starts to resolve; pyrolyzing generated pyrolysis water, tar oil and liquid-state shale oil after being subjected to cooling and then retaining in thecollection bottle, wherein pyrolysis gases enter into the gas collection bottle filled with water through the gas outlet pipe; and recording a temperature and a pressure when the gases in the collection bottle are generated. According to the invention, a reliable research means is provided for the pyrolysis research on the big-block organic rock mass test sample.

Description

technical field [0001] The present invention relates to a high-temperature and high-pressure triaxial test method, especially a method suitable for studying pyrolysis or carbonization and mechanical properties of organic rock mass, underground coal gasification, mine fire occurrence and development mechanism research, and new energy development and utilization. High temperature and high pressure triaxial test device and method for organic rock mass. Background technique [0002] Both coal and oil shale are complex aggregates composed of high-molecular hydrocarbons and organic minerals, which are very sensitive to heat. Heating it in an isolated air or an inert atmosphere will produce a series of complex physical and chemical changes, among which as the temperature increases, a large number of gaseous substances (liquid substances) of different components and quantities will be produced. Pyrolysis reaction (dry distillation reaction) is one of its most notable features. At ...

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Problems solved by technology

However, no systematic research has been carried out in China on the retort experiment of oil shale under the approximate in-situ stress state of large size.

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