Natural gas hydrate synthesis and mining simulation experiment system and method

Abstract

The invention provides a natural gas hydrate synthesis and mining simulation experiment system and method. Combustible ice is synthesized by CH4 gas in a gas storage tank and clear water in a first liquid storage tank, a temperature control box, a backup pressure valve and a piston container form a combustible ice mining experiment system, and influences of the temperature, the pressure and the inhibitor quantity on combustible ice mining are analyzed by collecting the temperature, the pressure and the inhibitor quantity; meanwhile, further detailed analysis and research are conveniently carried out according to the temperature on a sand-filled tube, the internal temperature tested by a pressure probe and the change condition of the pressure; meanwhile, a one-way valve is used for preventing the back suction phenomenon caused by air interference in the experiment system, and the experiment accuracy is improved; and through the backup pressure valve, a fourth pressure gauge, a liquid injection pump and a fifth pressure gauge, precise control over the gas or liquid pressure is realized, pulses are prevented, and the accuracy of measurement and experimental results is improved. The natural gas hydrate synthesis and mining simulation experiment system is simple in structure and convenient to operate, and the experimental process is better controlled.

Description

technical field [0001] The invention relates to the field of natural gas hydrate development, in particular to a natural gas hydrate synthesis and exploitation simulation experiment system and an experiment method. Background technique [0002] Natural gas hydrate is a naturally occurring compound with a cage-type microstructure, and its molecular formula has been confirmed as CH 4 ·8H 2 O, that is, a methane molecule is surrounded by a cage structure formed by 8 water molecules. "Combustible ice" is its common name, because of its ice-like appearance and structure, and it can burn when exposed to fire. "Combustible ice" is an efficient and clean energy source with a high calorific value. Its combustion produces dozens of times more energy than ordinary fossil fuels of the same quality. [0003] According to estimates by scientists, the total global resources of combustible ice are about 10 trillion tons of oil equivalent, which can be used by humans for 64,000 years. Onl...

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Problems solved by technology

The disadvantage is that a large amount of expensive inhibitors are required, and the hydrate decomposition produces water to dilute the inhibitor and reduce its effect, which may cause environmental pollution, and the efficiency is not very high

[0008] The research on combustible ice mining technology is currently a hot topic in the industry. The existing experimental system for the synthesis and mining of natural gas hydrate has the following disadvantages: (1) When the corresponding gas and liquid are output, the pressure on the In terms of control, the design is relatively simple, resulting in the output pressure is not stable enough, there may be pulses, affecting the accuracy of measurement and experimental results

(2) After the formation of combustible ice, the measurement of the specific distribution of internal temperature and pressure is not accurate enough, and the precision is not enough, which brings inconvenience to the experimental research

(3) Some did not rule out the air interference in the experimental system, or there was a suction phenomenon during discharge, which brought errors to the experimental test, and some still had potential safety hazards

(4) Some equipment is inconvenient to operate and cannot better control the experimental process, which brings great inconvenience to the development of experimental research

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