Analysis and testing system and method for light hydrocarbon gas content in natural gas hydrate drill core

Abstract

The invention discloses a natural gas hydrate drilled core light hydrocarbon gas content analysis test system and a method. The analysis test system comprises a temperature control cavity, wherein a weight calculation part is arranged in the temperature control cavity; a sealed decomposition chamber is placed on the weight calculation part; a gas inlet one-way valve and a gas outlet gas circuit switch are respectively arranged on a gas inlet and a gas outlet of the decomposition chamber; a pressure meter and a safety valve are also arranged on the decomposition chamber; an air source is connected with the gas inlet one-way valve through a first fast gas circuit connector; the gas outlet gas circuit switch is connected with a gas inlet of a gas collecting chamber through a second fast gas circuit connector; a gas outlet, an air source and a hydrogen source of the gas collecting chamber are respectively connected with a corresponding gas inlet of a hydrogen flame ionization detector; a gas taking port is also formed in the gas collecting chamber. According to the natural gas hydrate drilled core light hydrocarbon gas content analysis test system and the method provided by the invention, a hydrate is controlled at low temperature so as to be decomposed, and the hydrogen flame ionization detector is used for directly measuring and analyzing light dydrocarbon gas volume, so that the accurate measurement on light dydrocarbon gas content in a natural gas hydrate reservoir drilled core is realized, the technical difficulties and the safety risks caused by low decomposition temperature, fast speed, and large release gas volume are overcome, and the system and the method are safe and practical.

Description

technical field [0001] The invention relates to a natural gas hydrate drill core light hydrocarbon gas content analysis test system and a natural gas hydrate drill core light hydrocarbon gas content analysis test method based on the system, which belongs to oil and gas exploration and development natural gas hydrate drill core methane analysis and content Determination of technical fields. Background technique [0002] Natural gas hydrate, commonly known as "combustible ice", is the largest oil and gas resource on the earth. How to effectively and safely explore, develop and utilize it is an urgent problem that needs to be studied and solved. [0003] The combustible components of natural gas hydrates are basically methane and a small amount of other light hydrocarbon gases. Therefore, accurate determination of methane content and distribution in gas hydrate reservoirs is a strong technical requirement for gas hydrate exploration, development and utilization. At present, d...

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Problems solved by technology

[0007] The purpose of the present invention is to provide a natural gas hydrate drill core light hydrocarbon gas content analysis test system and a light hydrocarbon gas content analysis test method based on the light hydrocarbon gas content analysis test system. With experience in testing methods for gas content in shale gas drilling cores, the sealing of the decomposition chamber and the safety guarantee against pressure have been strengthened. The gas collection chamber with gas pressure buffer function overcomes the technical difficulties and safety risks caused by the low temperature and fast decomposition of natural gas hydrate, and the large volume of released gas. It is safe and practical, with high detection sensitivity, high measurement accuracy, and simple and safe operation. , to solve the strong technical demand for the accurate determination of methane content and distribution in gas hydrate reservoirs in the exploration, development and utilization of gas hydrate

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