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Meg As Gas Hydrate Inhibition

glycol as gas hydrate inhibit

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#1 Elí

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Posted 30 June 2016 - 04:05 PM

Dears,
Could someone tell me how much is the ideal concentration (% weight) for a solution of MEG as gas hydrate inhibitor?. 
 
Due the pressure drop in a gas well choke valve the temperature fall up to 20 ºF and hydrate temperature according my simulation is 60 ºF, therefore presence of gas hydrates are expected.  I reviewed the options for mitigation and  Heating is not economically feasible, so  injection of inhibitor upstream choke valve is the best option.
 
Thanks,


#2 Bobby Strain

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Posted 30 June 2016 - 10:15 PM

If you are not going to recover the MEG, methanol may be less expensive. So you should seek help from someone who is familiar with the systems. And they can give you proper advice.

 

Bobby



#3 cea

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Posted 30 June 2016 - 11:55 PM

There is nothing like ideal concentration, which can be considered as standard.

 

A necessary calculation needs to be done for calculating quantity of hydrate inhibitor. The best source is GPSA handbook.

 

Additionally, you may refer "Offshore World" Oct-Nov. 2012 issue, titled "Estimation of Hydrate Inhibitor Requirement (Methanol) by GPSA method over HYSYS" (www.oswindia.com/archives.com)



#4 Elí

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Posted 01 July 2016 - 07:29 AM

Thanks!!!

and is there any problem if 100% MEG is used as gas hydrate inhibitor?



#5 serra

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Posted 08 July 2016 - 09:43 AM

you may wish to calculate the amount of water condensing at specified conditions,

then, different fractions of inhibitor (up to 100% and above)  may be required to avoid hydrate formation,

however take care that hydrate models are not very accurate with high fractions (60-70% and above),

these figures are from CPA in Prode Properties (I tested for methanol but MEG should be similar),

may be Aspen allows a different range, you may compare, anyway.



#6 RockDock

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Posted 02 August 2016 - 01:50 PM

I would inject 100% MEG. I do this with ProMax often.I would recommend you do the same.






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