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Permalink Reply by king john on December 29, 2010 at 11:48

kevin, i am familiar with the oliver unit. the bulk of my land and minerals are within a crows mile from there. there is a neighboring unit that devon owns that may interest you. it is called the CASE unit. adubu and i have discussed this a few times and it may very well be a pinnacle reef but no one has publicly called it that. i have posted some info in the past on the pinnacle reef. if you do a search you may be able to find it. if not i will post again. i'm off for a few days to do my hitch, but, i'll check when i get back. i wouldn't mind hearing what les and jay know about the pinnacle reefs...

y'all have a great weekend !!!

kj

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Permalink Reply by DJG on December 31, 2010 at 16:43

Took another look at the completion reports for both that Oliver #4 and the Case #3 wells there in Shelby.

 

The formation records on both of them are showing the Pay Zone at approximately 12,000 to 12,100' deepth.   They list do list shallower formations such as Pettet, James Lime, Travis Peak etc, but then only list Cotton Valley as the last formation logged at around 10,000' deep.   No mention of Haynesville or Bossier so it the exclusion of those formations make it SEEM like the producing zones are in the shallower Cotton Valley B zone.

 

Comparing them to other more recent completions in that area, however, show that Cotton Valley B is at around 10,000',  Bossier is at around 10,900,  Haynesville at around 11,900 and then Cotton Valley Lime at around 12,050 and below.

 

That said, it seems pretty clear that these two wells are producing from the CV Lime below the Haynesville and Bossier.

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Permalink Reply by DJG on January 3, 2011 at 18:42

 

Here's a link to a pretty good map of the stratographic column in East Texas:

 

http://www.prescocorp.com/projects/east%20texas/stratcolumn.html

 

The lime that is directly below Haynesville/Bossier has been referred to both - from what I have seen - as Haynesville Lime or interchangeably as Cotton Valley Lime.   It is a seperate formation that lies, where present, underneath the Haynesville/Bossier shales but before the deeper Buckner or Smackover formations.

 

After looking at the well logs of he Oliver #4 well and then comparing them to other wells drilled at nearby locations.   It does appear that the Oliver #4 well is producing from the deeper Cotton Valley/Haynesville Lime formation and not from the shallower CV sands.

 

The pay zone of the vertical Oliver #4 is at over 12,050' deep and other nearby wells are showing Bossier formation present at around 10,900' and Haynesville shale at 11,800' or so.

 

The Oliver #4 does not list either of the HA/BO shale formations on it's formation record, but instead only lists the shallower CV sands formation top around 10,000' and a pay zone at around 12,050'.     My hunch that this was a tactical decision to either refrain from confirming that HA/BO were present at the time that this well was first reported or to refrain from divulging that the well is actually producing from that deeper HA/CV Lime.

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Permalink Reply by DJG on January 3, 2011 at 19:10

A few more interesting links:

 

http://www.energyfrontierspartners.com/cvl/figure11.htm

 

http://www.energyfrontierspartners.com/cvl/index.htm

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Permalink Reply by Spring Branch,mineral owner on December 30, 2010 at 4:06

Buck, your link doesn't work for me!

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Permalink Reply by Spring Branch,mineral owner on December 30, 2010 at 4:08

In what part of Shelby County are the Oliver #4 and the Case Unit located and also in what Survey?

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Permalink Reply by Spring Branch,mineral owner on December 30, 2010 at 4:15

Julie, I see you answered this question previously on the Shelby County site, but where is the Benjamin J. Porter, A559 Survey in relation to Center for example?

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Permalink Reply by jffree1 on December 30, 2010 at 4:30

About 10 miles SW of Center

Attachments:

• Oliver.jpg, 157 KB

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Permalink Reply by Steve Henderson on December 30, 2010 at 4:29

SB, he had too many http's. Try this:

 

http://www.claytonwilliams.com/cotton_valley_Information.htm

 

This is from 2000 or 2001, and is in a different part of Texas. Maybe Pinnacle Reef stretches from Center to Bryan/College Station.

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Permalink Reply by DJG on December 30, 2010 at 8:39

That Oliver #4 is certainly the best well to date in Shelby County.   Devon had also permitted a horizontal in that same unit - but to date has not drilled that new well.      Looking at the depths of the Oliver #4 in relation to other wells in the area, it also seems that this well might actually be in the CV Lime that is underneath the HA/BO and not the other CV formation above the HA/BO.

 

FYI - there have been some other monster wells in BO Sands and CV trend that Les posted via that Clayton Williams link.

 

Some of those IP's have been as high as 30-60 mmcfd and there have been some EURs in that region well into the 20 BCF range.     There's a well in Washington County about 15-20 miles to the NW of our ranch there that has pulled a whopping 32 BCF+ since it was first drilled in the early 90's.    Need to look at that one again to see the well logs as to weather that one is CV, Austin Chalk or BO Sand completion.

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Permalink Reply by intrepid on December 31, 2010 at 19:28

I hope the mineral owners had at least a 25% lease.

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Permalink Reply by John Cooper on January 4, 2011 at 5:17

Just spent a few minutes on the Texas RR Commission site.  The well log is still considered confidential, and has not been released yet.  The API number for this well is 42-419-31266-0000, if ya'll want to look up any info...

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