Gas quality change during production
Gas quality change during production
(OP)
Hi,
I am looking for someone who may be able to explain what is occurring on my well. During the past couple months, I notice that the Natural Gas Liquid sale is relatively low, and found that it is related to low 'delivered GPM' value. This 'delivered GPM' is determined by the monthly gas sample analysis, and suggesting that NGL components within the producing gas are decreasing. Thus, there are lesser Ethane, Propane, Iso-Butane, etc.. while Methane is relatively higher. So my question is: Is it usual for the gas quality to change during the life of the well?
Thank you for your time
I am looking for someone who may be able to explain what is occurring on my well. During the past couple months, I notice that the Natural Gas Liquid sale is relatively low, and found that it is related to low 'delivered GPM' value. This 'delivered GPM' is determined by the monthly gas sample analysis, and suggesting that NGL components within the producing gas are decreasing. Thus, there are lesser Ethane, Propane, Iso-Butane, etc.. while Methane is relatively higher. So my question is: Is it usual for the gas quality to change during the life of the well?
Thank you for your time





RE: Gas quality change during production
For wells the only constant is change.
My motto: Learn something new every day
Also: There's usually a good reason why everyone does it that way
RE: Gas quality change during production
RE: Gas quality change during production
Water coming from underneath is also dragged up by the diminishing pressure above it, but usually tends to sweep the hydrocarbon ones in front of it.
You also have natural and man made cracks in the rocks which allow the smaller gas molecules to travel faster than the bigger heavier ones.
I'm sure this is highly simplistic and would welcome any input from more learned posters, but it works for me and when I get predicted reservoir rates from the reservoir engineers, they often show a steep decline in liquids before the steeper decline in gas flow.
However each well is different and each field operation more complex than that.
If you need more definitive information I suggest you contact a geo-physist or reservoir engineer.
My motto: Learn something new every day
Also: There's usually a good reason why everyone does it that way