Triaxial test device for testing transubstantiation of sediments of gas hydrate

A triaxial test, natural gas technology, applied in the direction of measuring devices, using stable tension/pressure testing material strength, instruments, etc., can solve the problem of volume change, pressure difference, and pressure that cannot simulate the real stress state of seabed hydrate deposits Chamber deformation and other problems, to meet the requirements of high-precision experiments, improve measurement accuracy, and avoid cavity deformation

Inactive Publication Date: 2011-07-27
CHINA NAT OFFSHORE OIL CORP +2
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Problems solved by technology

[0004] In recent years, some research institutes have used the conventional triaxial instrument of soil mechanics to carry out the research on the variable measurement of gas hydrate deposits. Generally, the triaxial instrument with single pressure chamber is used. The disadvantage of this kind of variable measurement device of natural gas hydrate deposit is : 1) It is only suitable for volume change measurement under low confining p

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  • Triaxial test device for testing transubstantiation of sediments of gas hydrate
  • Triaxial test device for testing transubstantiation of sediments of gas hydrate
  • Triaxial test device for testing transubstantiation of sediments of gas hydrate

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Embodiment Construction

[0024] The present invention will be further described below in conjunction with the accompanying drawings, but the present invention is not limited to the following embodiments.

[0025] The structural representation of the triaxial test device for measuring the change of natural gas hydrate deposits provided by the present invention is as follows: figure 1 As shown, the flow chart of using the device for testing is as follows figure 2 As shown in the figure, each mark in the figure is as follows: 1 Outer cover tube, 2 Inner cover tube, 3 Base, 4 Snap ring, 5 Snap ring fixed sleeve, 6 Hydraulic oil inlet and outlet hole A, 7 Hydraulic oil inlet and outlet hole B, 8 Piston, 9 Row Air hole, 10 upper pressure pad, 11 lower pressure pad, 12 upper seepage plate, 13 lower seepage plate, 14 natural gas hydrate deposit sample, 15 refrigerant circulating fluid inlet and outlet holes, 16 heat exchanger, 17 hydraulic oil tank, 18a , 18b, 18c, 18d, 18e, 18f, 18g, 18h needle valve, 19a,...

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Abstract

The invention provides a triaxial test device for testing the transubstantiation of sediments of a gas hydrate. The device comprises a closed pressure chamber consisting of an outer cover barrel and a base; an inner cover barrel is arranged in the closed pressure chamber; the inner cover barrel is fixed on the base; at least two oil inlet/outlet holes are formed on the base; the opening of one oil inlet/outlet hole is formed on a circular cavity between the outer cover barrel and the inner cover barrel; the opening of the other oil inlet/outlet hole is formed on an inner cavity of the inner cover barrel; pistons are arranged on the tops of the outer cover barrel and the inner cover barrel; exhaust holes are formed on the pistons; a lower pressure pad and an upper pressure pad which correspond to each other are arranged in the inner cavity of the inner cover barrel; the upper pressure pad corresponds to the positions of the pistons; and the lower pressure pad is fixed on the base.

Description

technical field [0001] The invention relates to a triaxial test device for measuring the deformation of natural gas hydrate deposits, which belongs to the field of measuring the mechanical characteristics and basic physical properties of natural gas hydrate. Background technique [0002] As a clean energy with great potential, natural gas hydrate has the characteristics of large reserves, high energy density, wide distribution, and shallow burial. Its safe exploitation has become a new research hotspot in the oil and gas industry. The recovery of natural gas from gas hydrate deposits will reduce the strength of the seabed deposits, increase the instability of the seabed, and may cause geological subsidence, submarine landslides and other disasters. Spilled methane gas has a strong greenhouse effect and is a potential factor of global warming. In addition, during the exploration and production of hydrates, the drilling operation disturbs the geological structure of the hydra...

Claims

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Application Information

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IPC IPC(8): G01N3/12G01B21/00
Inventor 宋永臣刘卫国李洋辉于锋李清平姚海元王世圣
Owner CHINA NAT OFFSHORE OIL CORP
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