Vibrating marine hydrate pressure sampler

A sampler and hydrate technology, which is applied to sampling devices and other directions, can solve the problems of low pressure retention rate, low pressure retention success rate, and difficulty in forming cores into a column, so as to improve the pressure retention success rate and pressure retention rate, and improve the pressure retention rate. Pressure-sealing performance, the effect of stable excitation frequency
CN107727432BActive Publication Date: 2020-03-24JILIN UNIV
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
JILIN UNIV
Publication Date
2020-03-24

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Abstract

The invention discloses a vibrating type marine hydrate pressure maintaining sampler. The vibrating type marine hydrate pressure maintaining sampler consists of a positioning mechanism, a vibration coring mechanism, a hydraulic lifting mechanism, a flushing mechanism and a pressure maintaining mechanism. Gas hydrate exists stably in the high-pressure and low-temperature sea floor and frozen soil zone, and is sensitive to temperature and pressure changes; and non-pressure-maintaining hydrate sampling can cause hydrate decomposition. Marine hydrate generally exists in pores of shallow sedimentary sandstones at the bottom of the sea, is low in degree of consolidation, is loose and easy to be washed out, and is difficult for coring. Aiming at seabed argillaceous powder sand type hydrate, in-situ pressure maintaining coring of a hydrate layer is carried out in a mode of providing power by armored cables, coring with vibration, eliminating solid phase particles with cleaning liquid and maintaining pressure by a flap valve.
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Description

technical field

[0001] The invention relates to a vibrating marine hydrate pressure-holding sampler, which is especially suitable for in-situ fidelity sampling of hydrates in loose muddy silt deposits easily subject to erosion. Background technique

[0002] Gas hydrate is a clathrate crystalline compound formed by water and gas under high pressure and low temperature environment. Marine gas hydrate has huge reserves, cleanness and high calorific value, and it is a promising potential energy source. Several countries have carried out detection research on marine hydrates. The existence of marine hydrates is mainly based on ① BSR pseudo-bottom reflection seismic zone, ② logging-while-drilling technology, and ③ seabed sediment sampling technology. Natural gas hydrate sampling is used as direct evidence of the existence of hydrates. The test of cores can also analyze the reasons for the formation of hydrates and evaluate the reserves of regional hydrates. Since the exploitation...

Claims

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