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A triaxial test device for natural gas hydrate deposits

A hydrate sediment, triaxial test technology, which is applied in the direction of applying stable tension/pressure to test the strength of materials, to avoid cavity deformation and hydraulic water leakage, improve volumetric measurement accuracy, and reduce volume.

Active Publication Date: 2017-06-13
DALIAN UNIV OF TECH
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  • Application Information

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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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  • A triaxial test device for natural gas hydrate deposits
  • A triaxial test device for natural gas hydrate deposits

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Experimental program
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Effect test

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 triaxial test device for natural gas hydrate deposits, which belongs to the field of testing the mechanical properties of natural gas hydrate deposits. The device includes a triaxial test device host, a temperature control system, a pore pressure control system, a confining pressure control system and a computer data acquisition and control system. The host of the triaxial test device adopts a double pressure chamber structure, which can accurately measure the change of sediments during the decomposition of natural gas hydrate; the load sensor is installed inside the pressure chamber to improve the accuracy of the strength data; The pore gas and pore water of the sample are pre-cooled to reduce the decomposition of natural gas hydrate in the saturated water process, and also improve the accuracy of temperature control; the sample installation process is connected by quick joints, which is convenient and fast. The device can simulate the decomposition process of natural gas hydrate under production conditions, realize high-precision temperature control, and accurately measure strength and volume change. It is of great significance to understand the mechanical properties of natural gas hydrate deposits and evaluate the stability of reservoirs.

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 Patents(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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