Method and device for measuring gas production rate of natural gas hydrate exploitation

Abstract

The invention discloses a method and a device for measuring the gas production rate of natural gas hydrate exploitation. The method comprises the following steps: introducing methane gas generated bythe natural gas hydrate exploitation into a tank body with a relatively high liquid level; discharging water replaced by the methane gas into the tank body with a relatively low liquid level through awater discharging pipeline, and meanwhile, carrying out gas discharging and pressure reduction on the tank body with the relatively low liquid level; when the pressure of the measuring device reachesthe set pressure safety upper limit or the liquid level falls to the set liquid level safety lower limit, triggering a tank reversing mechanism, wherein the process is a one-time gas drainage process, and at the moment, due to the fact that the liquid levels of the two tank bodies are interchanged, the gas drainage direction and the water drainage direction of the two tank bodies are interchanged: the gas drainage process is repeated until the methane gas generated by natural gas hydrate exploitation is completely subjected to the gas drainage process. According to the method and the device,the natural gas hydrate exploitation gas production rate is safely and accurately metered, and certain guiding significance is achieved for the 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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