Pressure maintaining cutting device for natural gas hydrate sampling pipe

Abstract

The invention relates to a high pressure maintaining cutting technology, and aims at providing a pressure maintaining cutting device for a natural gas hydrate sampling pipe. The pressure maintaining cutting device for the natural gas hydrate sampling pipe comprises a hollow tubular outer cylinder used for pressure maintaining, a tool feeding and retracting mechanism, a circumferential rotation mechanism and a clamping mechanism; a tool feeding and retracting internal component, a circumferential rotation internal component and a clamping internal component are arranged in the outer cylinder insequence through a bearing and a matched bearing base; and the circumferential rotation speed and radial feeding speed of a tool bit and the clamping speed of a clamping jaw are determined by controlling the rotation speed of a motor. The pressure maintaining cutting device for the natural gas hydrate sampling pipe has the advantages that pressure is balanced, the structure is simple and basically symmetric, and the installation is convenient and simple; cutting is uniform, the disturbance of a sample is reduced during cutting, a sample cutting device does not generate secondary pollution tothe sample, and cutting is carried under pressure maintaining and temperature control conditions; and the cutting depth, the tool feeding and retracting speed of cutting and cutting speed can be controlled accurately.

Description

technical field [0001] The invention relates to a high-pressure-holding cutting technology, in particular to a pressure-holding cutting device for a natural gas hydrate sampling pipe. Background technique [0002] As an important high-quality and efficient new energy source, natural gas hydrate has attracted the attention of countries all over the world, including my country, because of its large reserves and wide distribution. Natural gas hydrate is a crystallization formed under low temperature and pressure on the seabed when natural gas molecules (alkanes) are wrapped in water molecules. The formation of natural gas hydrate requires appropriate temperature, pressure, gas saturation, water salinity, pH value, etc. The stable environment in the deep sea maintains the state of gas hydrates unchanged, but there are changes in the external environment when the deep-sea pressure is maintained and sampled. It is necessary to maintain the pressure during the process of deep-sea ...

AI Technical Summary

Problems solved by technology

The current high pressure holding cutting has the problems of unbalanced cutting, slow cutting speed and inconvenient operation

Due to the problem of unbalanced internal and external pressure difference in the existing high-holding pressure cutting, some parts are difficult to operate, which will prolong the sample cutting time. The longer the cutting time, the more uncertain factors, and the existing cutting device still has a lot of room for improvement

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