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Dynamic loading system for measuring dynamic characteristics of natural gas hydrate sediments

A technology for hydrate deposits and dynamic characteristics, applied in the field of dynamic loading systems, can solve problems such as the reduction of shear strength and bearing capacity of natural gas deposits, and the impact on engineering safety of seabed structures, etc., to achieve small temperature changes and system The effect of low cost

Inactive Publication Date: 2014-03-05
DALIAN UNIV OF TECH
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Problems solved by technology

However, the decomposition of gas hydrates during the exploitation of gas hydrates will not only reduce the shear strength and bearing capacity of gas-bearing sediments, but also affect the safety of submarine structures and other projects.

Method used

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  • Dynamic loading system for measuring dynamic characteristics of natural gas hydrate sediments

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Embodiment Construction

[0019] The specific embodiments of the present invention will be described in detail below in conjunction with the technical solutions and accompanying drawings.

[0020] As shown in the accompanying drawing, a dynamic loading system diagram for measuring the dynamic characteristics of natural gas hydrate deposits, its working process is as follows:

[0021] (1) Put the prepared hydrate sediment sample 5 into the triaxial pressure chamber.

[0022] (2) Control the reaction temperature of the hydrate deposit sample 5. Before the experiment starts, first use the cold storage to control the temperature to provide a suitable ambient temperature. The refrigeration temperature range is –20°C to room temperature; then use the low temperature control system 18 to control the temperature , to precisely control the temperature of the hydrate deposit sample 5 in the triaxial sample chamber.

[0023] (3) Apply the internal and external pressure, and provide the required internal and exte...

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Abstract

The invention discloses a dynamic loading system for measuring dynamic characteristics of natural gas hydrate sediments and belongs to the technical field of measurement of mechanical characteristics of natural gas hydrate sediments. The dynamic loading system is characterized in that the system is formed by connecting a three-axis pressure chamber, a heat exchanger, an axial loading piston, a hydraulic oil source, a hydraulic actuator, a servo valve, a servo driver, a servo controller, a digital / analog (D / A) interface, a data acquisition module, an industrial personal computer, a load sensor, a displacement sensor, a strain sensor, a low-temperature control system, an internal confining pressure loading system and an external confining pressure loading system, wherein the internal confining pressure loading system, the external confining pressure loading system and the low-temperature control system can rapidly and accurately control the pressure and temperature, so that the experimental requirement of performing in-situ reaction on submarine hydrates in a lab is met. The system has the effects that the dynamic characteristics of the natural gas hydrate sediments can be tested according to the system, important kinetic parameters are provided for safety mining of the submarine natural gas hydrates, and the system is relatively low in construction cost.

Description

technical field [0001] The invention belongs to the technical field of measuring the mechanical characteristics of natural gas hydrate deposits, and relates to a dynamic loading system for measuring the dynamic characteristics of natural gas hydrate deposits. Background technique [0002] As a clean energy with large reserves, natural gas hydrate is expected to become an important alternative energy source in the future, and its safe exploitation has become a major research hotspot in natural gas exploitation. However, the decomposition of gas hydrates during the exploitation of gas hydrates will not only reduce the shear strength and bearing capacity of gas-bearing sediments, but also affect the safety of submarine structures and other projects. The decomposition of gas hydrate will increase the gas content in the pores of the sediment, resulting in excessive pore pressure, reducing the cementation strength of the sediment, and the decomposition zone will become a huge unst...

Claims

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Application Information

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IPC IPC(8): G01N3/12G01N3/02
Inventor 宋永臣赵佳飞刘卫国李洋辉陈云飞朱一铭吕炎汲崇明沈治涛李倩倩王莉军
Owner DALIAN UNIV OF TECH
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