A continuous sampling device and sampling method for marine natural gas hydrate

Abstract

The invention discloses a continuous sampling apparatus and a continuous sampling method for a marine natural gas hydrate. The continuous sampling apparatus comprises refrigeration equipment, a single-action rotation sampling drilling tool, a high-pressure plunger pump, air compression equipment, nitrogen production equipment, a thermal insulation and pressure retention separation device and a thermal insulation and pressure retention ore box, wherein the refrigeration equipment, the single-action rotation sampling drilling tool, the high-pressure plunger pump, the air compression equipment, the nitrogen production equipment, the thermal insulation and pressure retention separation device and the thermal insulation and pressure retention ore box are connected through pipelines, and are sequentially fixed on an exploration ship, and the single-action rotation sampling drilling tool contacts a marine natural gas hydrate stratum. According to the present invention, the high-pressure low-temperature jet flow is used as the cutting tool to drill into the stratum, the broken hydrate blocks are transported to the sea surface thermal insulation and pressure retention bin through the hydraulic lifting mode, the continuous core sampling can be achieved according to the self-protection effect, the hydrate decomposition caused by the frictional heat generation of the drilling bit can be effectively reduced, and the anti-circulation channel can be in the low temperature environment.

Description

technical field [0001] The invention relates to a sampling drilling tool and a sampling method, in particular to a continuous sampling device and a sampling method for marine natural gas hydrate. Background technique [0002] Natural gas hydrate, also known as solid methane, is composed of natural gas and water and is in a solid state. Its appearance is very similar to ice and snow or solid alcohol, and it can burn when ignited, so some people call it "combustible ice", "air ice", "Solid Gas". The crystallization framework of natural gas hydrate is mainly composed of water molecules. Under different low temperature and high pressure conditions, water molecules crystallize to form different types of polyhedral cage structures. It is estimated that the amount of methane resources in the global seabed gas hydrate is about 2.16×10 16 m3, the total amount of carbon in methane is equivalent to twice the total amount of currently known fossil fuel resources such as coal, oil, and...

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to solve the problems of the above-mentioned existing sampler that cannot achieve continuous coring due to the need to stop drilling to salvage the core tube after the core is filled with the core tube, and the problems of hydrate decomposition caused by friction and heat generation of the drill bit, and provide a Continuous sampling device and sampling method for marine natural gas hydrate

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