Tuesday, August 29, 2017


Frac crews have arrived this morning on the EOG Eagles Ranch 14H-1. It's very likely that it will be many weeks before an initial potential is posted on SONRIS. Be sure to "filter" through what you hear. Remember, rumors of 2200 bopd started BEFORE the frac job even started. Also, it will take six months to get comfort on the initial decline curve.  The presence of natural fractures in the Austin Chalk can create some chaos and unpredictability.

Monday, August 21, 2017

EOG - Austin Chalk - Colorado County, TX

EOG has taken a similar "stealth" approach in Colorado County, Texas as they have recently in Louisiana. On March 27, the company spud an Austin Chalk well, the Pallas Energy Services LLC Tonkawa Unit #1. It has a permitted total depth of 16500'.  In Avoyelles Parish, their well was permitted under Sentry Energy Services LLC.

The Tonkawa well is located in the southern deep part of the very prolific Giddings Field. The maps below illustrate that EOG's well is on trend with some of the most prolific gas producers in the play. In contrast to the Karnes Trough, they appear to be targeting a much higher GOR in Colorado County.  Their well is in the "bullseye" of the most active leasing over the past 90 days.  Everyone likes to chase EOG.

Most importantly, the log signature is very similar in all three of their project areas: Karnes, Colorado, and Avoyelles/St.Landry/Pt. Coupee Parishes, Louisiana.  The cross section below illustrates two wells from Colorado County and Avoyelles Parish.  While 293 miles apart, the Passey log display presents very similar log signature with very comparable Passey values.  The high TOC thicknesses (DLogR > 1.0) of 174' and 180' represent a very attractive target for a high proppant frac job. The mean DlogR values are also very similar. Results from these two "Energy Services" wells will be very important for both areas.

Friday, August 18, 2017

Sentry (EOG) Eagles Ranch 14H-1 - Drilling Update

Sentry Energy Services (EOG) has completed the drilling process on the Eagles Ranch 14H-1. Note that a pilot hole was drilled before kicking out horizontally.  The drill times compare with the Louisiana Austin Chalk drilling phase that occurred in 2011.  A permit has been filed for the frac job. It sounds like 4288' will be the perf range.

Finally the rumors have started and the mineral buying speculators have shown up.  As always, they range from gusher to dry hole.  Always entertaining.

The first significant data point will appear 30-60 days after the frac job completes. Until then, we'll all have to be patient.  Note that this new Austin Chalk approach is different from the historical "naturally fractured" play. Review the prior posts regarding the Karnes Trough.

Drill times: Eagles Ranch 14H-1 compared to 2011 Louisiana Austin Chalk wells

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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.