Replies to This Discussion

Permalink Reply by Skip Peel - Mineral Consultant on January 26, 2011 at 17:29

If I compare this well to those in the immediate vicinity with completion reports on file there is an obvious and significant difference.  I'll try to find time to look further at those well profiles.  If this well has the down dip in the lateral that the perfs suggest, it is an anomaly that I have not noticed previously.  No lateral that I have reviewed has ever remotely approached this variance from the horizontal.

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Permalink Reply by Les Bamburg on January 26, 2011 at 19:22

Skip, I have spotted several across various parts of the play area and there are probably others that just haven't yet been posted.

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Permalink Reply by Skip Peel - Mineral Consultant on January 30, 2011 at 15:08

LA. Department of Natural Resources definition of True Vertical Depth (from the Glossary available through SONRIS):

 

TRUE VERTICAL DEPTH The vertical depth of the well from the ground to the bottom hole.

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Permalink Reply by Mac Davis on January 30, 2011 at 16:44

What is the definition of bottom hole?  The deepest spot in the well bore or the end of the well bore?  The SONRIS glossary says, "Bottom Hole - the bottom hole location of a well," which isn't really that useful.  The interactive maps seem to always show the end of the well bore as the "bottom hole."

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Permalink Reply by Les Bamburg on January 30, 2011 at 18:35

Mac, for a horizontal well the Bottomhole Location (BHL) would be at the end of the lateral.

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Permalink Reply by Les Bamburg on January 30, 2011 at 18:40

Skip, that definition fits for the TVD shown on the well report but there is an MD & TVD for each point along the wellbore.

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Permalink Reply by Skip Peel - Mineral Consultant on January 31, 2011 at 2:26

Les, IMO the only logical reason for the state requiring an operator to provide a True Vertical Depth based on the DNR definition is to make plain the formation, zone or depth that is being produced.

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Permalink Reply by Les Bamburg on January 31, 2011 at 5:12

Skip, actually it is just a way to define the depth to which the well is drilled rather than the producing formation.  This information is required for the State to properly track and permit drilling activity. 

 

The TVD generally does give a clue but it is not uncommon for wells to be permitted and/or drilled to depths beyond the target formation.  The better information is the designation of the target zone or formation on the well permit.

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Permalink Reply by Skip Peel - Mineral Consultant on January 31, 2011 at 5:21

Les, I am not referring to TVD listed in permit applications.  I am referring to them in completion reports.  I find the target zone to be less exact as the unit designation can read CV, for instance, but the depth definition can include formations and zones other than the CV.

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Permalink Reply by Les Bamburg on January 31, 2011 at 8:39

Skip, the same applies to the completion report as it relates to the drilled TVD at the BHL.  This can be very different than the producing depth for vertical and deviated wells.  The target zone in the drilling permit is still the best indicator as it is rare for the zone to include other formations.

Permalink Reply by jffree1 on January 26, 2011 at 5:51

Nacogdoches County:

Valence, 347-33004, Hollis Walton #1, vertical, 14,073'

Samson, 347-33133, Silver Hammer #1H, 13,718', 18,055'

EOG, 347-33137, Murray GU #1H, 14,152', 19,240'

EOG, 347-33141, Crane Et Al #1H, 14,351', 19,539'

EOG, 347-33153, ACLCO #1H, 14,470', 19,440'

EOG, 347-33157, Atkinson #1H, 14,408', 18,777'

 

There are more.

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Permalink Reply by Skip Peel - Mineral Consultant on January 26, 2011 at 6:00

Thanks, jffree.  I suspected that some TVD's at or below 14,000' existed.  And Nacogdoches and south would make sense.  Could you post some Bottom Hole temps for those wells if and when they are available?

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