Hydrate sediment in-situ permeability pressure gradient and mechanical property measuring system

Abstract

The invention relates to a hydrate sediment in-situ permeability pressure gradient and mechanical property measuring system. The system comprises a reaction kettle, a sediment sample, a confining pressure loading device, a pore pressure loading device, an axial pressure loading device, a refrigerating device, a data acquisition device and a control display, the reaction kettle is used for containing a sediment sample and is connected with other devices; the axial pressure loading device is used for loading axial pressure to the sediment sample through an axial loading piston; the pore pressureloading device is used for applying pore pressure to the sediment sample; the confining pressure loading device is used for applying confining pressure to a confining pressure chamber; the refrigerating device is used for controlling the temperature of the sediment sample; the data acquisition device is used for acquiring temperature and pressure data of the sediment sample in the experiment process; and the control display is used for controlling the axial pressure loading device and the refrigerating device and processing and displaying data acquired by the data acquisition device. The system can be widely applied to the field of hydrate measurement.

Description

technical field [0001] The invention relates to a measurement system for in-situ permeability pressure gradient and mechanical properties of hydrate deposits suitable for CT, belonging to the field of geotechnical engineering basic physical property measurement. Background technique [0002] Hydrate, as a new energy source with huge reserves, high energy density, and clean and pollution-free, has successfully attracted the attention of people all over the world. A series of geological disasters such as landslides and wellbore instability. Therefore, it is necessary to study the permeability pressure change at the microscopic level and its mechanical properties at the macroscopic level. [0003] However, there are many problems in the current research: [0004] 1. At this stage, the device for simulating and measuring the internal permeability pressure of the sample can only study the approximate pressure of the entire sample, and it is difficult to characterize the pressur...

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Problems solved by technology

[0004] 1. At this stage, the device for simulating and measuring the internal permeability pressure of the sample can only study the approximate pressure of the entire sample, and it is difficult to characterize the pressure change of the sample at each position in the simulated environment and the corresponding hydrate formation area;

[0005] 2. For the research on the mechanical failure performance of hydrate under axial pressure, the current research can only study the macroscopic mechanical properties, and there is no way to observe and study the specific analysis at the microscopic level;

[0006] 3. The confining pressure of liquid silicone oil and the cooling of the water bath wrapping the reactor in the experimental device greatly hinder the clarity of CT shooting, and cannot be used for CT microscopic research;

[0007] 4. The exterior material used in the pressure chamber is pure aluminum or aluminum alloy and other low-density materials with good thermal conductivity, which is easy to cause heat loss and affect the temperature change during the experiment, and the water bath is still distributed around the pressure chamber, which hinders CT shooting. And it is impossible to study the change of permeability pressure at the micro level

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