A device and method for detecting mechanical parameters of hydrate-containing sediments based on x-ct

Abstract

The present invention proposes a device and method for detecting mechanical parameters of hydrate-containing sediments based on X-CT. The device includes a reactor, the body of the reactor is a beryllium or carbon fiber pressure-resistant tube, the end covers at both ends are sealed, and the outer side of the lower end cover is connected to the The axial pressure loading reaction mechanism is connected, and the interior of the reactor is from top to bottom: the upper sample adjustment pad, the sediment sample, the lower sample adjustment pad and the axial pressure loading piston, and also includes a shear loading unit, a back pressure control unit, Unload the pressure loading unit and the strain measurement unit. The invention satisfies the high-pressure conditions required for the synthesis of methane hydrate, and can accurately control the axial temperature of the sample to make it evenly distributed; it can also quickly control the temperature to improve the efficiency of sample preparation, and can adjust the size of the sample to achieve control of different The purpose of the aspect ratio of the sample is that the invention can realize the simultaneous detection of the stress-strain curve of the gas hydrate-containing sediment and the internal damage microstructure of the sediment, and can realize the constant-strain shear and constant-stress creep test.

Description

technical field [0001] The invention relates to the field of basic physical property evaluation of natural gas hydrate reservoirs, in particular to a device and method for analyzing microscopic damage zones and macroscopic stress-strain curves of hydrate-containing sediments based on the combination of micro-nano CT scanning and triaxial experiments. Background technique [0002] Studying the dynamic response characteristics of reservoir mechanical parameters in the process of hydrate mining is the basis for revealing the critical conditions for the occurrence of engineering geological risks related to hydrate mining, evolution rules and their impact on hydrate mining. Conventional mechanical parameter tests mainly use sediment failure under "short-term" loads as the basis for evaluating the mechanical properties of hydrate-containing sediment systems, but lack of time-sensitive behavior of slow deformation (ie, creep) of reservoirs under long-term mining conditions. researc...

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Problems solved by technology

[0006] In view of the defects existing in the prior art that cannot meet the high pressure required for the synthesis of methane hydrate, uneven temperature control methods, and insufficient temperature control efficiency, which affect the measurement accuracy, the present invention proposes a method for realizing hydrate deposition in a high-pressure environment. The device for X-CT scanning of matter and the simultaneous accurate measurement of macro and micro of sediment sample deformation process is realized by the following technical scheme:

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