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Natural gas hydrate sediment triaxial test device

A hydrate sediment, triaxial test technology, applied in the direction of applying stable tension/pressure to test the strength of materials, to achieve the effects of improving accuracy, reducing volume, avoiding cavity deformation and hydraulic water leakage

Active Publication Date: 2015-08-12
DALIAN UNIV OF TECH
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Problems solved by technology

However, since gas hydrate is affected by its formation conditions (low temperature, high pressure) and stability, there is currently no mature set of methods that can simulate the decomposition process of gas hydrate, achieve high-precision temperature control, and accurately measure sediment strength and volume. variable triaxial test device

Method used

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  • Natural gas hydrate sediment triaxial test device
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Experimental program
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Embodiment Construction

[0026] figure 1 Shown is a system diagram of a gas hydrate sediment triaxial test device. The following describes the gas hydrate sediment triaxial test process according to each system function:

[0027] 1) The working process of the temperature control system: the constant temperature tank 9 injects a certain temperature cooling liquid into the cavity of the base 19 and the ring cavity formed by the pressure chamber cylinder 15 and the heat preservation cover cylinder 16 through the circulation pump 8 and the needle valve 31. The cooling liquid in the cavity of the base 19 pre-cools the pore gas and pore water entering the natural gas hydrate deposit sample 23 to prevent the decomposition of natural gas hydrate, and at the same time controls the temperature of the liquid in the pressure chamber through the upper surface of the base 19; The cooling liquid in the annular cavity formed by the pressure chamber cylinder 15 and the insulation cover cylinder 16 is used to control t...

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Abstract

The invention discloses a natural gas hydrate sediment triaxial test device, and belongs to the field of testing the mechanical properties of natural gas hydrate sediment. The device comprises a triaxial test device main machine, a temperature control system, a pore pressure control system, a confining pressure control system and a computer data acquisition and control system. The triaxial test device main machine, which is in a dual-pressure-chamber structure, can be used for accurately measuring volume change in the sediment in a natural gas hydrate decomposing process; a load sensor is arranged inside the pressure chamber and is capable of improving the precision of intensity data; a pre-cooling hollow cavity is formed inside a base to pre-cool pore gas and pore water which enter a sample, so as to relieve the decomposition of the natural gas hydrate in a saturated water process and to improve the precision of temperature control; in a sample installation process, a quick coupling is adopted for connection, so that the operation is convenient and rapid. The device can simulate the natural gas hydrate decomposing process under mining conditions, so as to achieve the high-precision temperature control, and accurate measurement of intensity and volume change; and the device has great significances for understanding the mechanical properties of the natural gas hydrate sediment and assessing the stability of a reservoir.

Description

technical field [0001] The invention relates to a natural gas hydrate deposit testing technology, in particular to a triaxial test device capable of simulating the decomposition process of natural gas hydrate under mining conditions, realizing high-precision temperature control, and precise measurement of strength and volume change. Background technique [0002] With the huge consumption of oil and gas resources, mankind will face the depletion of oil and gas resources in the late 21st century, and the global economic development will face severe challenges. As a potential clean energy, natural gas hydrate has attracted great attention from all countries in the world, including our government, because of its wide distribution and large reserves in the world. [0003] Natural gas hydrate is different from conventional oil, natural gas and other resources. It exists in the sedimentary layer in the form of cement or framework support, and the temperature rise or pressure drop m...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N3/10
Inventor 李洋辉宋永臣徐晓虎刘卫国杨明军赵佳飞
Owner DALIAN UNIV OF TECH
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