6 replies to this topic

[Dmitry]

Hello,

Does water should be present in gas stream to create hydrates formation? As I know - a hydrate is a physical combination of water and other small molecules.

Thanks

Edited by Dmitry, 24 April 2012 - 01:07 AM.

[ankur2061]

Dmitry,

Read the blog entry:

http://www.cheresour...on-temperature/

Regards,
Ankur.

[Dmitry]

Dmitry,

Read the blog entry:

http://www.cheresour...on-temperature/

Regards,
Ankur.

Dear Ankur,

Thanks for a link, I downloaded your Excel spreadsheet and I've made a calculations using Hysys V 7.3 and with your data.
Results are very closer with your Excel spreadsheet. I got hydrate formation temperature 18.31 C.

But I am still confused, because we got next components:
Methane 0,82 Ethane 0,09 Propane 0,08 i-Butane n-Butane 0,01 i-pentane n-pentane n-hexane n-heptane

and no water!!!. In your post I found:
"Hydrates are crystalline solid compounds formed from water and smaller molecules in hydrocarbon fluids such as methane, ethane, propane, nitrogen, carbon dioxide and hydrogen sulfide."

"A sufficient amount of water – not too much, not too little."

In this case quantity of water is zero. Please explain me it.

Dmitry

[ankur2061]

Dmitry,

You probably missed out this part from the blog entry:

C. Free Water:
Free-water is not necessary for hydrate formation, but the presence of free-water certainly enhances
hydrate formation

Regards,
Ankur

[Dmitry]

Dmitry,

You probably missed out this part from the blog entry:

C. Free Water:
Free-water is not necessary for hydrate formation, but the presence of free-water certainly enhances
hydrate formation

Regards,
Ankur

But in our case we haven't free water and gas doesn't saturared with water.

Dmitry

[ankur2061]

Dmitry,

The meaning of the sentence is that it is not necessary to have water as a component (water mole percent = 0%) in the gas for hydrate formation. In other words gas may not be water saturated and even then hydrates can form with the hydrocarbons, CO2, H2S and nitrogen.

The presence of heavier hydrocarbons (C4, C5, C6+) enhances the hydrate formation temperature which means that higher the quantity of heavier hydrocarbons higher will be the hydrate formation temperature.

Regards,
Ankur.

Edited by ankur2061, 24 April 2012 - 03:20 AM.

[Dmitry]

Thanks, now all is clear!

Dmitry