A method and device for measuring gas production in natural gas hydrate exploitation

Abstract

The invention discloses a method and device for measuring the gas production of natural gas hydrate exploitation. The method includes connecting methane gas produced by natural gas hydrate exploitation into a tank with a relatively high liquid level; The water is discharged into the tank with a relatively low liquid level through the drainage pipeline, and the tank with a relatively low liquid level is exhausted and decompressed at the same time; when the pressure of the measuring device reaches the set pressure safety upper limit or the liquid level falls to the set liquid level When the level is lower than the safety limit, the tank inversion mechanism is triggered. The above process is a gas drainage process. At this time, because the liquid levels of the two tanks are high and low, the directions of exhaust and drainage of the two tanks are interchanged: repeat the gas discharge process. Drainage process, until all the methane gas produced by natural gas hydrate exploitation is subjected to the gas drainage process; the invention can safely and accurately measure gas production in natural gas hydrate exploitation, and has certain guiding significance for natural gas hydrate exploitation.

Description

technical field [0001] The invention relates to the field of gas flow measurement, in particular to a method and a device for measuring gas production of natural gas hydrate exploitation. Background technique [0002] Natural gas hydrate (Natural Gas Hydrates, NGH) is a white ice-like crystal composed of water molecules and gas molecules such as light hydrocarbons, CO2 and H2S under low temperature and high pressure conditions (can be directly burned, commonly known as combustible ice), is a non-chemical Metering of inclusion compounds. Natural gas hydrate is widely distributed in the world and has a large amount of resources. It is considered to be a future high-quality and clean energy. Its reserves are about twice the total carbon content of the existing earth's fossil fuels (oil, natural gas and coal). It will become the most important energy source for mankind in the 21st century. With the increasing energy demand of human beings, traditional heavily polluting fossil ...

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Problems solved by technology

[0003] The mass flowmeter used in the measurement of the gas production flow in the natural gas hydrate exploitation experiment has always had the problem of large errors in the measurement of the gas flow, which has a great impact on the experimental results

So far, there has not been an effective device and method for accurate and safe measurement of gas production in natural gas hydrate production

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