Seabed refrigeration pressure retaining type gravity piston sampling device and sampling method thereof

A gravity piston sampling and pressure-holding technology, which is applied in sampling devices, preparation of test samples, etc., to achieve the effect of reducing requirements, reducing decomposition, and reducing critical decomposition pressure

Active Publication Date: 2017-09-29
JILIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Therefore, during the sampling process of gas hydrate, low temperature and high pressure should be maintained, but the conventional gravity piston sampler is difficult to meet the requirements of gas hydrate exploration and subsequent related research

Method used

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  • Seabed refrigeration pressure retaining type gravity piston sampling device and sampling method thereof
  • Seabed refrigeration pressure retaining type gravity piston sampling device and sampling method thereof

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Embodiment Construction

[0024] The upper and lower ends of the weight cable 35 of the release mechanism are respectively connected with the weight 41 and the balance bar 21, the balance bar 21 is connected with the hook 20 by threads, the fixed plate 5 is connected with the hook 20 by a hinge, and the hook 20 can rotate around the hinge . The fixed plate 5 is connected to the buffer clamp through the rigid connecting rod 4, and the buffer clamp is composed of the buffer clamp shell 19, the buffer clamp spring 2, and the buffer clamp piston 3. The lower end of the buffer clamp piston 3 is connected with the release cable 6 , and the upper end of the buffer clamp shell 19 is connected with the main cable 1 . When the weight 41 touches the bottom of the sea, the weight cable 35 changes from a tense state to a relaxed state, and the balance bar 21 tilts so that the hook 20 is released to release the cable 6. At this time, the gravity piston sampler is under the action of gravity and seawater Uniformly a...

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Abstract

The invention relates to a seabed refrigeration pressure retaining type gravity piston sampling device and a sampling method thereof. The sampling device provided by the invention is formed by a gravity sampling pipe, a refrigeration mechanism and a pressure retaining mechanism. The sampling pipe is formed by an outer pipe, an inner pipe, a piston, a piston rod and a counterweight connector; a cavity between the outer pipe and the inner pipe forms a refrigeration cavity; a cold storage mechanism is arranged on the upper end of the counterweight connector. The pressure retaining mechanism is arranged in the sampling pipe, and is formed by an impact block, a positioning steel ball, a positioning spring, a pushing rod, a thrust spring, a rocking bar, a connecting rod and a pressure retaining ball valve. The sampling method provided by the invention comprises the following steps of enabling a natural gas hydrate layer to penetrate into the cavity sampling device by utilizing kinetic energy and gravitational potential energy during a process of lowering to a seabed through the cavity sampling device, closing a cavity of the cavity sampling device, and meanwhile, injecting a cold source into a refrigerating cavity refrigerating core from the cold storage cavity. On one hand, the critical decomposition pressure of the natural gas hydrate is reduced, and on the other hand, a self-protection effect of the natural gas hydrate is improved, so that the decomposition of natural gas is reduced, and the requirement on a natural gas hydrate pressure retaining mechanism is reduced.

Description

technical field [0001] The invention relates to a seabed sampler and a sampling method, in particular to a freezing and pressure-preserving gravity piston sampler for sampling seabed sediment and seabed natural gas hydrate. Background technique [0002] Natural gas hydrate is a kind of green energy with abundant reserves, high energy density and no pollution. It is estimated that the total amount of natural gas hydrate resources in the world is equivalent to twice that of known coal, oil and natural gas in the world, which can meet the energy needs of human beings for thousands of years. Gas hydrates are mainly distributed in the marine sediments on the continental shelf and the edge of islands, where the environment is characterized by high pressure and low temperature. [0003] How to explore the gas hydrate on the seabed has become a current research hotspot. There are many methods for exploring seabed gas hydrates, such as geophysical methods, fluid geochemical methods...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N1/08G01N1/42
CPCG01N1/08G01N1/42
Inventor 孙友宏马晓龙贾瑞王元苏凯张国彪
Owner JILIN UNIV
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