Thursday, March 22, 2018

Random Look At Two Slawson Wells -- Part I -- March 22, 2018

This is Part I.

Part 11 is here.

Part III is here.


Disclaimer: in a long note like this, there will be typographical and factual errors. Facts, comments, and opinions are interspersed and hard to separate or discern. There are a lot of digressions. There is no hidden agenda and no "fake news" -- at least no attempt to post "fake news." I appreciate any fact checking. If this is important to you, go to the source.

For newbies: This is an interesting area to walk through -- sections 27/34-151-92, Van Hook / Big Bend (the NDIC map clearly shows this section in Big Bend oil field, but the scout tickets identify this drilling unit in Van Hook oil field).

This is a Slawson drilling unit; these are Slawson wells. Slawson always seems to have something a little bit different than the other operators.

Let's digress for a second. I talked about this a long, long time ago.
  • CLR; the "face" of the Bakken; most acres; most drilling; "damn the torpedoes, full speed ahead" -- or in this case, "forget hedging, let's just drill"
  • Whiting: years ago, wanted to exit the Bakken, or change its focus, and now appears to be the most active operator in the Bakken -- although the CLR folks might disagree with me (and I might be wrong)
  • Slawson: always a surprise; liked stacked laterals; like re-entries; of the operators in this short list, Slawson is the only one not "publicly traded"
  • MRO: most aggressive re-frack program, especially in fields like the Bailey oil field
  • WPX: 7% of the Fort Berthold Indian Reservation
  • XTO: prominent player but not much to say about them
  • Oasis: one of the most interesting to watch over the years; got "their break" through MDU
  • QEP: simply methodically drilling out the Helis Grail
Okay, now back to the Slawson wells in section 27/34-151-92.

The first two wells in this drilling unit were #19207 and #19208. They were both short laterals, one running north, one running south.
  • 19207, 613, Slawson, Vagabond 1-27H, Van Hook, t4/11; cum 358K 1/18;
  • 19208, 800, Slawson, Water Moccasin 4-34-TFH, Van Hook, t4/11; cum 324K 1/18;
They were both drilled at the same time, back in 2011. This would be in the late days of the boom, about the middle of Bakken 1.0. (Bakken 1.5 was during the Saudi Surge, 2014 - 2016; Bakken 2.0 began in 2016).

The well that ran north (#19207) was a middle Bakken well; the well that ran south (#19208) was a Three Forks, upper bench, well; Slawson specifically said that this well, #19208, was a "continuation" of their program to develop the Three Forks.

On the graphic, you will notice two laterals for #19208. Generally, when one sees that in the Bakken, it is because there was a problem with the first lateral, and the operator went back in and drilled a parallel lateral to get "around" the problem. Initially I thought this was the case for #19208.

But it turns out that Slawson went back in, in 2014, re-entered the vertical, and launched another horizontal, this time in the middle Bakken.  (Interestingly, they re-entered, re-fracked #19208 just two months before they drilled / fracked three new long laterals running from the north to the south alongside these two older short laterals.)

Before we go too far in this story, let's look at the frack reports.
  • First, #19207, API - 33-061-01410: FracFocus has no frack data for this well which means that the original fracks occurred in 2012 or before. And no reports of any re-frack.
  • Second, #19208, API - 33-061-01411: FracFocus has two pdf fracking reports, they have different URL numbers suggesting one was the TF frack and the other was the MB frack. Again, the original frack does not show up on FracFocus; the frack report for 6/18/2014 - 6/21/2014 is for the completion of the middle Bakken horizontal, the re-entry / second lateral, and the re-frack (?) for the TF horizontal.
So, we will stop there, catch our breath. Give folks a chance to look at the graphic and imagine the drilling unit as of 2014: two wells, one going north with one lateral (middle Bakken); one going south with two laterals (a Three Forks, and then a middle Bakken); both short laterals. (Not mentioned yet, in fact, by the end of 2014, there were six more wells in this drilling unit -- but we will get to them later.)

Both were typical Bakken wells at the time; nothing great but they were what they were. 

Another digression, regarding fracking/completion:
Completion (frack) strategies vary significantly from well to well, or should we say, "can vary significantly from well to well."
  • But as a starting point, let's consider this pretty much a standard frack, for a long lateral
  • 10 million gallons of water = 83 million lbs of liquid
  • 8% proppant (sand/ceramic) by weight of the total frack mixture = 8 million lbs of solids
A note about fracking over the years:
[Going forward, 
  • before 2014: typical fracks with 4 million lbs of sand or less; BEXP/Statoil was the first to start using huge amounts of sand
  • after 2014: small initial fracks (4 million lbs of sand); typical initial fracks (10 million lbs of sand); humongous fracks (20 million lbs of sand)
  • after 2017: we started seeing re-fracks -- typical (4 - 8 million lbs of sand); mini-re-fracks of 2 million lbs of sand or less (and sometimes a lot less); work-overs don't include fracking or re-fracking]
Wow, lots of digressions. 

So, we are still looking at the two early wells, #19207 and #19208.

Frack data for the initial frack for these two wells:
  • 19207 MB: tested April 5, 2011; 19 stages; 1.85 million lbs sand (mesh/small) -- an incredibly small amount of sand, but about the "norm" back in 2011;
  • 19208, first lateral, TF: tested April 8, 2011; if it was fracked after it was first drilled, I don't see the frack data at the file report (I may have missed it; I assume it was fracked; I assume it was fracked similarly to what was used for #19207 at the same time)
  • 19208, second lateral, MB: there file report shows the schematic for the re-entry but does not provide a frack / completion report. Fortunately we have the FracFocus report: fracked (as noted above) -- 6/18/2014 - 6/21/2014:
    • 33-061-01411-00-00-6272014:
      • water: 1,646,501 gallons
      • sand: 19% by mass (assuming I'm reading the report correctly)
    • 33-061-01411-00-00-7112014:
      • water: 1,646,501 gallons
      • sand: 19% by mass (again, same assumption)
Note: these two reports -- except for the URL numbers appear to be identical, suggesting that the reports were accidentally duplicated (my original thought) but now it appears they used the very same "mix" to frack the MB and re-frack the TF. I could be very wrong on this. 

Production profiles at time of original completion, 2011, are very similar for both wells:

#19207:
BAKKEN8-201131844885032807518548750
BAKKEN7-201131737666953020376934590
BAKKEN6-201130539162342819293426340
BAKKEN5-201131937581434119340130910
BAKKEN4-2011165084459813854883280

#19208:
BAKKEN8-201131603259683956424039300
BAKKEN7-201131697172374404502647160
BAKKEN6-201128608359575879360633260
BAKKEN5-201131580453223864231620060
BAKKEN4-2011167520675162407045440


 Production profiles at time of the re-entry (19208); frack of the TF and re-frack of the MB; 2014:
#19207:
BAKKEN1-201519875878684968583640261715
BAKKEN12-2014313392014921986565406
BAKKEN11-2014301733517369128221166297891723
BAKKEN10-2014311823218017150751239192452991
BAKKEN9-201413632758864603274415981081
BAKKEN8-20141793912872896195340
BAKKEN7-201431184915927079828270
BAKKEN6-2014201717148869010129120
BAKKEN5-2014116487312074073520
BAKKEN4-2014301806214065210348840


#19208:
BAKKEN1-20151998778965496853714384892
BAKKEN12-2014311671751921700441244
BAKKEN11-201430153521532312822843566771608
BAKKEN10-201431144971444815075705150191877
BAKKEN9-20141468796397582635182742706
BAKKEN8-201421842394912951500448990
BAKKEN7-20143113241125138830443942840
BAKKEN6-2014369930711202111960
BAKKEN5-201463124631262302000
BAKKEN4-20143021352502916136712170


END OF PART 1.

This is where we stand at the end of 2014 in this drilling unit: history of two short laterals drilled in 2011.

Part 2 will look at what happened to these wells when newer long laterals were drilled and completed: three wells were completed in mid-2013 but were well west of these two short laterals; and three wells that were much closer to these two short laterals and completed just two months later, August, 2014. 

The graphics:





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