Replies to This Discussion

Permalink Reply by Les Bamburg on July 8, 2011 at 17:43

Diana, recognize that all but one (235780) of the wells you listed are Haynesville Shale completions located within LCV units that included the Haynesville Shale formation.

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Permalink Reply by diana canady on July 9, 2011 at 8:36

Thanks Les.  I did not realize that.  Sorry.  It was the decline rate that caught my eye to start with as those looked to me like they were not declining as rapidly as expected and then I thought the vertical depth was not as deep as neighboring Haynesville Shale wells so I thought the depth was linked to the decline rate..  (I may not be seeing the whole picture though.)  Thanks!

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Permalink Reply by Spring Branch,mineral owner on July 9, 2011 at 10:04

Diana, I believe you have brought up an interesting topic to review, i.e. the decline curve of horizontal Lower Cotton Valley Wells.   As I've said on this site many times, horizontal Cotton Valley wells were to be the next "Big Thing" before the discovery of the Haynesville. I am certain that they will be an important component of natural gas production in Northwest Louisiana before it is all over.  In Sections where there is no commercial Bossier Shale present, it would be nice to have 8 horizontal Cotton Valley wells to supplement the Haynesville and operated by an additional group of Operators wouldn't be bad either.  Here are several horizontal Lower Cotton Valley wells that are NOT Haynesvilles:

Ser. # 239583

Ser.# 237950

Ser.# 240480

These three wells are Operated by Questar in the Thorn Lake Field, but there are others elsewhere.

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Permalink Reply by diana canady on July 10, 2011 at 4:24

Thanks Spring Branch.  On horizontal LCV wells that I've looked at, it appears to me the decline is slower, so I think it would be very interesting to see the typical LCV decline curve.  I wonder how much data was looked at to arrive at the HS decline curve - i.e. was it a small sample set with similar characteristics like 10 wells from the Caspiana area that all came in close to 20MCF with similar pressures or was it a large sample like 100 wells from all over the Haynesville Shale production area including wells with initial IP's ranging from 5 to 30 and large variance in pressures.

Permalink Reply by Spring Branch,mineral owner on July 10, 2011 at 6:52

Dianna, I believe all the Operators in the Haynesville show a slightly different  decline curve based on whether they are using restricted chokes, and  based on geographic  location in the play.

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