Hydrate evaluation experiment system and method

Abstract

The invention provides a hydrate evaluation experiment system and method. The hydrate evaluation experiment system comprises a first gas cylinder, a second gas cylinder, a flow control device, a flowcontroller, a magnetic stirring container, a chemical reagent injection device, a closed loop and the like. The first gas cylinder is used for storing CH4 or natural gas mixed gas; a gas outlet of thefirst gas cylinder is connected with the magnetic stirring container through the flow controller; the second gas cylinder is used for storing CO2 gas; a gas outlet of the second gas cylinder is connected with the magnetic stirring container through the flow control device; a chemical reagent injection port is formed in the magnetic stirring container and is connected with an outlet of the chemical reagent injection device; and the closed loop is respectively connected with the first gas cylinder, the second gas cylinder and the chemical reagent injection device through a twentieth valve. According to the method, hydrate formation can be simulated, meanwhile, the influence on hydrate formation and decomposition rules is analyzed, and further detailed analysis and research can be carried out conveniently to guide production.

Description

technical field [0001] The invention relates to the field of hydrate development, in particular to a hydrate evaluation experimental system and method. Background technique [0002] Natural gas hydrate is a naturally occurring compound with a cage-like microstructure. It is an efficient and clean energy source with a high calorific value of combustion. Its combustion energy is dozens of times higher than that of ordinary fossil fuels of the same quality. Natural gas hydrate is a cage crystal compound formed by small molecules of light hydrocarbon gas such as methane in natural gas and water molecules under certain temperature and pressure conditions, which is similar in appearance to loose ice or dense snow. [0003] With the further study of it, many mining methods have been proposed. The main principle is to change the temperature and pressure of the combustible ice reservoir, break its phase balance, and decompose the combustible ice to obtain methane gas. In the process...

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Problems solved by technology

[0005] The existing experimental systems for the synthesis and exploitation of hydrates have the following disadvantages: (1) The research objects are mainly for natural gas hydrates, and few for CO 2 Hydrated

(2) There is no research on the properties of hydrate inhibitors and accelerators

(3) When the corresponding gas and liquid are output, the design of the control of the pressure is relatively simple, especially in the decompression decomposition experiment, the output pressure is not stable enough, and there may be pulses, which affect the accuracy of the measurement and the experimental effect

(4) 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

(5) Some equipment still has potential safety hazards or is inconvenient to operate, and cannot better control the experimental process, which brings great inconvenience to the development of experimental research

(6) No study on natural gas hydrate embolism in pipelines and corresponding preventive measures

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