Composite gas hydrate accelerant and application method thereof

Abstract

The invention relates to the technical field of the production and utilization of natural gas hydrate, and particularly relates to a composite gas accelerant and an application method thereof. The composite accelerant is prepared by mixing betaine acetate used as an additive, mahogany petroleum sulfonate used as a surface active agent and alkyl amine oxide, wherein by total mass of a mixed aqueous solution, the mass percentage of betaine acetate is 1 to 3 percent; the mass percentage of the surface active agent mahogany petroleum sulfonate is 1.2 to 4.5 percent; the mass percentage of amphiprotic surface active agent alkyl amine oxide is 3 to 5 percent; and the rest is deionized water. The prepared hydrate accelerant is simple in preparation method and good in accelerating effect; the accelerant can effectively improve the generation of hydrate, and the gas hydrate generation condition and generation time can be greatly reduced by virtue of little accelerant, so that the energy consumption can be effectively reduced, and the energy and cost can be saved.

Description

technical field [0001] The invention relates to the technical field of production and utilization of natural gas hydrates, in particular to a composite accelerator capable of strengthening the formation of natural gas hydrates and its use method, which can also be used to promote the formation of other gas hydrates. Background technique [0002] The non-stoichiometric compound formed by water molecules connected by hydrogen bonds to form a cage-shaped body and wrap one or more component gas molecules in natural gas is called natural gas hydrate; the most prominent features of natural gas hydrate are: 1. The gas storage density is extremely high. In theory, a unit volume of methane hydrate can store 164 times the standard state volume of methane (164m 3 / m 3 ); Second, the structure is stable, not easy to decompose, it can be stored under normal pressure at -15°C, and the storage conditions are low. [0003] At present, the problem of energy shortage and global warming is b...

AI Technical Summary

Problems solved by technology

[0005] Using methods such as stirring, ultrasonic atomization, spraying and bubbling can increase the gas-water contact area and increase the growth rate of hydrates, but they all bring Some other unfavorable factors: increased energy consumption, increased investment and operating costs, reduced gas storage density of hydrates, etc.; adding chemical agents to the reaction system is currently the most popular research method, and most of the research at home and abroad is in water. Add anionic surfactants, such as sodium dodecyl sulfate (SDS), tetrahydrofuran, etc., which can increase the growth rate of hydrates, promote the formation of hydrates, and shorten the induction time of hydrate formation to 1 to 1.5 hours, and the pressure is relatively pure. The water system is reduced by 1-2 MPa; however, although this type of surfactant can accelerate the formation of hydrate, it still has various shortcomings and is not satisfactory. Accelerator, which is of great value to realize the development and utilization of hydrate application technology and the industrial production of hydrate

Images