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Permalink Reply by bill h on May 11, 2011 at 11:48pm

I'd like to know that answer for NE pa gas

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Permalink Reply by 0jw0dsu4txfuv on May 12, 2011 at 12:39am

Marc,

Gas comes from tubing which is in the hole for the gas to come throurgh. The wellhead is there to hold

all the different casing that have been run and cemented in the well. Upon reaching the surface. the

gas goes thourgh a dryer and or heater treater to do to pielins for sale.

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Permalink Reply by Kathleen Elsie Gibbs on May 12, 2011 at 12:49am

Homer how do they handle the products that come from the drying process? Is it just released or captured?

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Permalink Reply by 0jw0dsu4txfuv on May 12, 2011 at 1:03am

I won't answer any of your questions. You take things to extreme and out of context.

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Permalink Reply by Kathleen Elsie Gibbs on May 12, 2011 at 1:37am

Thank you this gives me a good idea where you are coming from.

God Bless

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Permalink Reply by Marc Avice on May 12, 2011 at 12:57am

thanks for the clarification, Homer.

Then I would like to know the composition of the gas after going through the dryer/heater treater (which I guess is located very close to the well) but before it reaches a gas treating facility (for acid removal etc). The gas may still have a quite high amount of impurities at this stage (as the dryer will just separate the water from the gas).

I guess the gas has to go through several miles of pipeline before reaching a treating facilities (am I right?).

Anyone has some data or paper about that?

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Permalink Reply by 0jw0dsu4txfuv on May 12, 2011 at 1:04am

Not all the gas has to be treated. the treatment generally is done at the wellsite,

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Permalink Reply by Sylvester Deal on May 12, 2011 at 7:50am

Marc,

I haven't seen any data on field gas analysis for Marcellus gas on line.   Field gas analysis by gas chromatograph lists the hydrocarbons methane (C1), ethane (C2), propane (C3), butane (C4), pentane (C5).  Hexane and other hydrocarbons occur but at such low amounts that for simplicity they get lumped together and called hexane+ (C6+).  Methane has one carbon atom, ethane two carbons, and so forth.  Natural gas can contain carbon dioxide (CO2), nitrogen (N2), hydrogen sulfide (H2S).  Generally, H2S isn't a problem in the East until you get near the lower Devonian/upper Silurian formations a good distance below the Marcellus.

Typical ranges for components are:

C1  -  75-90%

C2  -  5-15%

C3  -  5-10%

C4  -  2-4%

C5  -  1-2%

C6+  -  1%

CO2  -  0-1%

N2  -   0-1%

 

The American Oil&Gas Reporter had an interesting article on gas processing in May 2009 edition.  I'll paraphrase as it is a subscription magazine, no link available for this article.

 

Pipeline quality rating for heat content is 1035BTU+/-50 per cubic foot and 1%-2% each for CO2 and N2, <10 parts per million for H2S, water < 7lb per million cubic feet.  Marcellus gas from northeast PA occur in a range 1000-1050BTU.   Other areas have ethane content as high as 16% that raises the BTUs beyond that allowed.  Refrigeration plants can extract 90% propane and 40% ethane (C2).  A cryogenic plant can recover all propane and 90% ethane (C2).  Taking the heavier components out will push the tail gas to 95-99% methane.  The problem becomes what to do with the ethane, unlike propane with local markets and trucking available.  Refrigeration plants just fed the ethane back into the tail gas of the process and counted on mixing with lower BTU gas from elsewhere.  With such high volumes available from the Marcellus, mixing doesn't work anymore.

 

Hence the focus on ethane pipelines to move it elsewhere and cracking plants to make ethylene.

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Permalink Reply by Kathleen Elsie Gibbs on May 12, 2011 at 7:55am

Thank you for this information. It actually answered my asked question.

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Permalink Reply by Bert Bankovic on October 5, 2011 at 2:14am

Excellent answer.  I'm glad this post was still up there, I was just asked this for work purposes.  Thanks Sylvester

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Permalink Reply by George Brown on October 5, 2011 at 8:39am

Thanks for that great information, Sylvester.  Reminds me of my Organic Chem days.

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Permalink Reply by Bert Bankovic on October 5, 2011 at 9:21am

I case this revived this as a topic of interest, here is a great pdf document with further details on other domestic basins: http://www.bre.com/portals/0/technicalarticles/Keith%20Bullin%20-%2...

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