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Methanol Injection

The spreadsheet calculates the minimum required inhibitor usage for gas flow based on various input parameters such as gas flow rate, specific gravity, and temperatures. Key outputs include an inhibitor requirement of 38.62 lb/MMscf, a daily injection rate of 386.18 lb/day, and an hourly injection rate of 2.42 gal/hour. Users are instructed to update the input data highlighted in blue to view results.

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aameglio
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11 views3 pages

Methanol Injection

The spreadsheet calculates the minimum required inhibitor usage for gas flow based on various input parameters such as gas flow rate, specific gravity, and temperatures. Key outputs include an inhibitor requirement of 38.62 lb/MMscf, a daily injection rate of 386.18 lb/day, and an hourly injection rate of 2.42 gal/hour. Users are instructed to update the input data highlighted in blue to view results.

Uploaded by

aameglio
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
Available Formats
Download as XLS, PDF, TXT or read online on Scribd
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MethanolInjection.

xls
This spreadsheet calculates the minimum amount of required inhibotor usage.

Instructions:
1) Update input data in blue;
2) View result.

Input Data:

Gas flow rate: 10 MMscfd


Gas specific gravity (gg): 0.7 air = 1
Minimum pressure (pm): 900 psia
Inlet gas temperature (ti): 90 F
o

Hydrate temperature pm: 64 F


o

Operating temperature (to): 40 F


o

Water content at ti and pm: 48 lb/MMscf


Water content at to and pm: 9.6 lb/MMscf
Inhibitor solution density: 6.64 ppg
Inhibitor concentration (Win): 100 Wt %

Intermediate Calculations:

Water to be removed from gas (wG): 38.4 lb/MMscf


Molecular weight of inhibitor (MW)inh: 32
Hammerschmidt constant for inhibitor (KH): 2335
Depression of hydrate formation temperature (Dth): 24 F
o

Inhibitor requirement based on Hammerschmidt's method:

( MW )inh Δt h = 24.75 Wt %
W h= ×100
( MW )inh Δt h + K H

Liquid phase:

WG
I 100 = = 12.63 lb/MMscf

( 100
−
100
W out W in )
Gas phase:

lb m MeOH/MMscf
=f ( P , t ) = 1.05
WT % NeOH in Water

Inhibitor requirement: 25.99 lb/MMscf

System total:
Inhibitor requirement: 38.62 lb/MMscf
Daily injection rate: 386.18 lb/day
58.16 gal/day
Hourly injection rate: 2.42 gal/hour
Check:
WG
I 100 = = 12.63
KH 100
1+ −
( MW )inh Δt h W in

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