Monday, June 5, 2017

Austin Chalk - South Texas, Karnes Trough Area

The map below depicts recent Austin Chalk activity in the Karnes Trough area (Karnes, Gonzalez Counties, TX).  The yellow boxes highlight active rig locations while the green provide the details on EOG's Austin Chalk completions.  EOG's Matterhorn well had a "prac IP" of 7088 bopd and 11858 mcfgd equating to 9064 boepd (Source DrillingInfo).  Their nine Austin Chalk completions in Sugarkane Field have prac IP's ranging from 157-9064.  It will be interesting to see if they can repeat these rates in other areas of the play.  Their results to the northeast in Gonzales County have prac IPs ranging from 64-795 boepd. Keep an eye on this one.

Thursday, June 1, 2017

EOG/Sentry Spuds Austin Chalk Well

Sentry/EOG spud the Eagles Ranch 14H-1 on May 23. With a planned measured depth of 21900', it will be interesting to see how long it takes to drill this well. In the Eagle Ford and Permian, EOG has set records for drilling time.

Drilling Report
DROVE 20" TO 177' W/ 143' PENETRATION; SPUD 5/23/17; DRLD; RAN SURFACE HOLE QUAD COMBO LOGS; RAN 13 3/8" CSG TO 2704' W/ 2465 SXS; TSTD BOP'S TO 250 LOW / 5000 HIGH ON 5/28/17; TSTD CSG; (BOP INFO: ANNULAR, GK, 13 5/8", HYDRIL, 5M; RAMS: TYPE U, 5", CAMERON, 10M);

Wednesday, May 24, 2017

Austin Chalk Trend - Field Production

The Austin Chalk Formation has been producing for many years from the Mexican border into Louisiana.  The trend covers millions of acres.  To date, 15,370 wells have produced 1.28 billion barrels of oil, 6.27 trillion cubic feet of gas, and 14 billion barrels of water.  In barrels of oil equivalent, it has produced 2.36 billion barrels. The map below presents the trend with the major fields summarized.

Tuesday, May 16, 2017

Austin Chalk - Log Analyis Comparison

With EOG's recent leap over to Louisiana to test their new Austin Chalk frac design, it might be beneficial to compare the log analysis from each area.  All three areas compared below have a plethora of historical vertical wells to use for analysis.

EOG's recent "monster" Austin Chalk wells are located in the Karnes Trough of Karnes County, Texas. 

EOG Resources - Austin Chalk competions - Karnes County, Texas
The figures below present a log analysis comparison using Exxon's Passey Log Method which presents a log-calculated total organic carbon (TOC) value. This method has been proven to work across most of the unconventional plays in the U.S.

For an overview of the method, here's an excellent paper from Thomas Bowman:

EOG has also been leasing on the county line between Fayette and Lavaca Counties. The figures below compare three wells from Karnes, Fayette/Lavaca, and Avoyelles Parish. 

For comparison, a Passey thickness (DLogR > 1.0) and DLogR "mean" were calculated.  Higher DLogR indicates higher TOC.  The mean DLogR values range from 1.09-1.26 with Avoyelles being the highest at 1.26. Thicknesses range from 174'-187' with Karnes County being the highest.

As more wells are drilled, a tighter calibration can be made.

Wednesday, May 3, 2017

EOG Returns to Louisiana Expanding Their Austin Chalk Exploration Plan

EOG Resources has been making some extraordinary Austin Chalk completions in the Karnes Trough of South Texas. Under their service provider's entity, Sentry Energy Services, LLC, they have filed a Louisiana Austin Chalk permit in North Bayou Jack Field.  On the ground intel indicates that a total of 10 permits have been filed in Avoyelles and St. Landry Parishes.  This first permit will be drilled as a lease well.

In EOG's February 27, 2017 quarterly presentation, they noted their game plan to include "capture new premium plays through organic exploration". This appears to be part of that plan.

The Sentry Energy Services LLC Eagles Ranch 14H-1 has a measured depth planned of 21,900' with a TVD of 16,720'.  In South Texas, the TVD of the completions have ranged from 10,500-12,150'.  The Eagle Ranch well plan represents a signficant increase in depth to drill and complete in. If anyone can succeed at this, it will be EOG Resources.  I consider them to be the best unconventional operator in the U.S.

More details to follow.

Tuesday, June 9, 2015

The chart below presents all of the completed wells with respect to the true vertical depth (TVD) and lateral length.

Thursday, June 4, 2015

I just discovered this TMS presentation online. It's from January, 2013. The geology is still valid, but the well results are dated. Enjoy.