Replies to This Discussion

Permalink Reply by JHH on January 25, 2011 at 16:03

Who knows where rumors begin.  It would have been nice to have had this forum before to the Haynesville boom!   Prior to that, the only talk between us common folk was that of dried up wells and spent fields.  Very few people knew the vastness of what was right under our feet... a couple miles down. and even fewer knew of the technology to get it unlocked. The rumors/discussions today might not lead to anything.  but it's nice to know people are talking. maybe someone out there knows something... maybe not.  but at least the forum exists to help us become more aware.  thanks

 

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Permalink Reply by Benjamin Hall on January 25, 2011 at 16:58

JHH, I could not agree with you more.  I felt a total disconnectednesss / powerlessness when i first heard about the Haynesville. This site has become such a wonderful resource for everyone.

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Permalink Reply by Linda Whatley on January 26, 2011 at 3:50

Ditto on that!!...  

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Permalink Reply by Sally McMichael on January 26, 2011 at 4:06

This info came from an independant that checks well pressure.  It was during lunch in central La..  He had no idea that the parties he was talking to had an interest in some wells in DeSoto.  He said that this information was something that the companies wanted to keep quiet so as not to run up the prices like the Haynesville did.  He was talking mainly about the Pleasant Hill Field and that because there were now 3 major levels this made that area standout.

 

Skip, there are wells deeper than 15,000 in Louisiana.  We have a well that is 16,000+.  (S1,T10N, R12W)

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Permalink Reply by Two Dogs, Pirate on January 26, 2011 at 4:14

Sally the vertical depth of your well is 12700 feet.

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Permalink Reply by P.G. on January 26, 2011 at 4:26

How are the accuracy of figures on wells that are reported verified?

 

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Permalink Reply by G. E. Merrill on January 30, 2011 at 14:45

Hi PG.  Just read this.  The accuracy today is very accurate if it reported accurately from the log data.  True Vertical Depth is an accurate measure of the wire line spooled off of the log truck and measured as it leaves and streatch is accounted for. 

Vertical well bores when viewed straight down look like cork screws so some error is inherent.

THAT IS THE OLD way.  Today, invented to accurately position well end points and bores that follow the subsurface contour of a pay horizon, steerable bits, bit motors and measuement while drilling (MWD) tools are guided by a system that is "similar to" inertial guidence systems used in navigation.  IE an accurate start point in 3 dimensions is the base point and movement from this point is very accurately measured in 3D.

 

So TVD using these tools are really a true vertical depth.  Horizontal end points can be accureatly placed to a very high degree of accruacy.  The MWD tools can keep you in a pay zone even across a fault by steering the Bottom Hole assembly to the depth of the pay on the other side of the fault.

 

HS well bores are usually now drilled with a J hook in them.  IE they go down vertically then are drilled away from the end line into the next section and then the curve is built back so that the pay horizon is intersected on the horizontal at the earliest point where the first perforations can be made where ALL the legal footage in a section can be perforated and produced.  If they did not do this they would lose a few hundred feet of legal section to perforate. JM

 

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Permalink Reply by Mac Davis on January 26, 2011 at 5:16

SONRIS lists "total depth," but this is really "length of the well bore," not "how far below the earth's surface is the deepest part of the well bore."

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Permalink Reply by Skip Peel - Mineral Consultant on January 26, 2011 at 5:20

This is the section of the SONRIS Lite Well File that pertains to TVD and MD.  The TVD is the depth being produced.  The difference between TVD and MD is lateral length.

 

BOTTOM HOLE COORD

EFFECTIVE DATE	END DATE	PLUGBACK TOTAL DEPTH	TRUE VERTICAL DEPTH	MEASURED DEPTH	LAT DEG	LAT MIN	LAT SEC	LONG DEG	LONG MIN	LONG SEC	COORDINATE SOURCE	LAMBERT X	LAMBERT Y	ZONE	COORDINATE SYSTEM
12/30/2009	04/25/2010		12099	16920	32	3	44.125	93	39	4.51	02	1643363	509537	N	01
04/26/2010			12098	16920	32	3	44.125	93	39	4.51	02	1643363	509537	N	01
09/15/2009	12/29/2009		12120	16350	32	3	44.125	93	39	4.51	02	1643363	509537	N	01

WELL HISTORY

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Permalink Reply by Les Bamburg on January 26, 2011 at 11:09

Skip, the difference between the two is an approximation but the actual lateral length will be shorter due to the curvature of the well path. 

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Permalink Reply by Skip Peel - Mineral Consultant on January 26, 2011 at 11:38

Thanks for the clarification, Les.  I just find it curious that the Lewis well has a TVD of 15,300' but the completion report gives the top of the Haynesville at 14,614, Mid Haynesville at 14,652 and the Lower Haynesville as 14,693'.  If the TVD is 15,300', is the HA zone 600+ feet thick in this location?

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Permalink Reply by Les Bamburg on January 26, 2011 at 17:13

Skip, realize those depths are only approximations and lack in absolute accuracy.  It is unclear if those values are TVD or SS.  There can also be a significant dip along the lateral as is this case with the variation in TVD being ~ 570 ft along the lateral.   

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