A vacuum gas extraction system for natural gas hydrate drilling site core gas

Abstract

The invention provides a vacuum gas collection system for core gas of a natural gas hydrate drilling field. The vacuum gas collection system comprises a vacuum pumping unit (A), a gas collector (B) and an extraction unit (C), wherein the vacuum pumping unit (A) comprises a vacuum manufacturing glass tube (16) and a vacuum pump (19); the gas collector (B) comprises a tank body (1) and a tank body cover (4) which are detachable and are in seal connection, and the tank body cover (4) is provided with a main hole and a subsidiary hole which is provided with a subsidiary hole tube (5); and the main hole of the tank cover (4) is provided with the extraction unit (C), and is communicated with an extraction chamber of the extraction unit (C). The vacuum gas collection system provided by the invention utilizes vacuum negative pressure in the gas collector and the gas collection and extraction chamber with a specific structure to extract release gas from a core sample, and thus the collecting efficiency of gas is improved; multiple sealing structures are utilized to eliminate air influence, and thus the quality of collected gas samples is guaranteed; and a water bath thermostat is utilized to deaerate, so that the influence of environment temperature change is removed, and the comparability of a core collecting capacity is improved.

Description

technical field [0001] The invention relates to the field of gas extraction, in particular to a vacuum gas extraction system for core gas at a natural gas hydrate drilling site. Background technique [0002] Gas hydrate is a kind of high density (1m 3 Can release 164m 3 The clean energy of methane) is twice the sum of conventional energy resources such as coal, oil, and natural gas in the world, and has attracted great attention from many countries around the world. During the drilling process, the amount of gas released by the core is one of the key parameters for quickly judging the presence or absence of hydrates on site. Therefore, hydrate drilling site core gas extraction equipment is an important basic equipment for gas collection, measurement, and rapid identification of hydrates at the drilling site. [0003] According to the literature search, the current domestic and foreign natural gas hydrate drilling core gas collection and extraction methods mainly include t...

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