BTU Factor and gallons NGL per Mcf

Can someone explain the conversion of  gallons NGL/Mcf into a BTU factor?  Or estimate a BTU factor from gallons/Mcf?  What's the math?   I can estimate the ethane/propane/iso butane/normal butane and natural gasoline percentages in a barrel if required.   Thanks.

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Permalink Reply by Philip Thackray on March 16, 2014 at 4:53am

Hiker, Invic,

Here are pictures of the sensors (first two) and the control box (third picture).

Phil

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Permalink Reply by deer spotter on March 16, 2014 at 11:13am

First two picks are orifice plate electronic measurement looks like a Rosemont 3051 variable transducer, Third pick looks like info center to send info back to central location. Shut down should be for compressor.

Permalink Reply by The Hiker on March 16, 2014 at 11:47am

Philip:  Is #006 the control cabinet with the display that shows output info for the well you referred to earlier?  Thanks for the pix.

Permalink Reply by Philip Thackray on March 17, 2014 at 12:45am

Hiker,

Yes - a display and readout controls are behind the small door.

Deer H,

There is no compressor at this location.  The Emergency Shutdown closes a valve at the well head.  This valve can be closed remotely from the Mother Ship.

Phil

Permalink Reply by Philip Thackray on March 16, 2014 at 5:00am

More pictures

1 - Overall view

2 - The two current wells (will be 7-8 wells in Marcellus)

3 - Another control box - there is an antenna behind the solar panel pointing toward the next unit.

Phil

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Permalink Reply by deer spotter on March 16, 2014 at 11:22am

Fluid tanks with small dehy towers and reboilers.( dryers ) To make the gas pipeline quality.  What area are the wells located?

Permalink Reply by Philip Thackray on March 17, 2014 at 12:55am

This is Forward Township, Butler County, PA - Wet Marcellus, Wet Upper Devonian, Dry Utica.

From left to right, the big green tanks are for water and condensate.  The horizontal green tanks with the brown smoke stacks are heaters, the tall green towers are the separators (condensate and water separated from the gas stream).  The white tank outside of the small fence is methanol.  The methanol is continuously injected into the output gas stream to tie up residual water.

Phil

Permalink Reply by deer spotter on March 17, 2014 at 11:06am

Phillp: Is there glycol in the heater and separator?

Permalink Reply by Philip Thackray on March 18, 2014 at 12:16am

Deer Spotter,

The heater is a liquid bath type like this one.  It may have water/glycol as the liquid medium. 

Phil

Permalink Reply by INVICTUS on March 18, 2014 at 1:32am

Is this picture (attached) one of these devices?

It was clearly running when I visited yesterday, chimney was expelling exhaust rather quietly.

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Permalink Reply by Philip Thackray on March 18, 2014 at 1:58am

Invic,

The large horizontal tube is the heater.  The rest of the setup differs from what I have seen here in Western PA but there must be a choke somewhere in there and separation (condensate and water) facilities .

Phil

Permalink Reply by shdixon on March 17, 2014 at 3:42am

Here's an interesting presentation that includes a graph by Dr. Callard. See slide #6. This might help. (You will need MS PowerPoint)

http://www.ogs.ou.edu/EARTHSCIED/danclassfiles/Volumetrics.ppt

It's an approximation and assumes that dry gas is 1000BTU. The formula would be:

(BTU - 1000)/50 = NGL gallons/Mcf

The average Bakken well BTU is 1534 and gives 12.298 NGL  gallons/Mcf. To make this formula calculate for the Bakken you would use 43.42 in the denominator.

(BTU - 1000)/43.42 = NGL gallons/Mcf

You may also want to increase the dry gas BTU value from 1000 to some higher number like 1027 or 1050.

 

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