Testing device and method for exploiting natural gas hydrate through carbon dioxide replacement with help of pressure reduction method

Abstract

The invention discloses a testing device and method for exploiting a natural gas hydrate through carbon dioxide replacement with the help of a pressure reduction method and relates to the field of natural gas hydrate exploitation. The testing device comprises a reactor, a constant-temperature water bath system, a pressurization air supply system, a stable flow liquid supply system, an overlying stress loading system, a vacuumizing system, a natural gas hydrate product processing and metering system and a data acquisition system. By means of the testing device and method, the generation of thenatural gas hydrate in a quartz sand body and the exploitation environment of an ocean sand rock storage layer are simulated; exploitation is carried out through pressure reduction at the early stage,and afterwards, natural gas hydrate exploitation is carried out through carbon dioxide replacement; the injection of carbon dioxide and the exploitation of the natural gas hydrate are implemented simultaneously by controlling and adjusting the pressure and temperature in the reactor, and the effect of carbon dioxide replacement and natural gas hydrate exploitation is better.

Description

technical field

[0001] The invention relates to the field of natural gas hydrate exploitation, in particular to a test device and a test method for assisting carbon dioxide to replace natural gas hydrate by a depressurization method. Background technique

[0002] Gas hydrates are mainly distributed in deep-sea sediments or land permafrost, and the total natural gas content of proven gas hydrates in the world has reached (1.8-2.1)×10 16 m 3 , and its organic carbon reserves are equivalent to twice the total amount of proven fossil fuels (coal, oil, natural gas) in the world. But so far, the mining method of natural gas hydrate is still in the theoretical and experimental research stage, and a complete set of natural gas hydrate mining theory and technology has not been formed, and large-scale commercial mining cannot be carried out. At present, natural gas hydrate production methods mainly include depressurization method, thermal activation method, carbon dioxide replacemen...

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