Monday, December 23, 2013

Re-Fracking In The Bakken; Case Studies With MRO

Updates
Other Re-Entry Wells
  • 16580, CLR, J. H. Skarphol 1-31H, Burke; Stoneview, re-entered the Bakken, 11/12; IP: 544, cum 97K 9/16; 320-acre spacing;
Original Post
 
This is a long post and it might be a bit hard to understand, but I am incredibly proud of this. Back in 2011, I came up with a list of 25 MRO wells that might be candidates for re-fracking.

I had completely forgotten about. Then a reader, tonight, sent me a note about an MRO well that was refracked.

Here's my post tonight on that subject.

*********************************

I opined not too long ago (I can't find the most recent post) that there are still debates whether re-fracks "will work" in the Bakken, and if so, how effective they will be. A reader sent in another example.

For background to this story:
A reader sent me this note:
16729, 348, MRO, Vihon 44-8H, this was a single-stage frack. MRO went in to re-frack and damaged the casing so the well was shut down for several months until they got it fixed; t11/07; cum 299K 9/16;
So, what's the story?
This well was originally spud and completed, as a one-stage frack, back in 2007.
It was subsequently re-fracked in 2011/2012, but ran into some difficulties before everything was "fixed."

Read the following production tables from bottom to top.
Following the one-stage frack, the well was spud/fracked with one stage back in November, 2011:
BAKKEN7-200831395440321655180218020
BAKKEN6-200830434946431536191119110
BAKKEN5-200831457841101231213321330
BAKKEN4-200827384036251765170217020
BAKKEN3-200827267628379651311310
BAKKEN2-2008293593386514712322320
BAKKEN1-2008314530450818137427420
BAKKEN12-2007275453538522021581580
BAKKEN11-200721615556332854000

Then, the re-fracked the well, sometime around the re-frack in late 2011/early 2012; the results were not good; they had problems, sort of unrelated to the re-frack per se:
BAKKEN6-20120000000
BAKKEN5-20120000000
BAKKEN4-20120000000
BAKKEN3-20120000000
BAKKEN2-20121000330
BAKKEN1-20120000000
BAKKEN12-20117209475271651295
BAKKEN11-2011301203116023290769037
BAKKEN10-2011311264113826295572052

Once they got everything fixed:
BAKKEN4-20133068987191231229422452310
BAKKEN3-2013311110111206374642063361659
BAKKEN2-2013731262767105548336480
BAKKEN1-2013300012110
BAKKEN12-2012314645484815691483126043
BAKKEN11-2012301119011629379338983152570
BAKKEN10-20121124871678298364107204

When originally posted, the well was producing about 5,000 bo per month.

Current status:
  •  16729, 348, MRO, Vihon 44-8H, Bailey, t11/07; cum 299K 9/16;
There are several story lines here.
  • The most important is the fact that folks like me will never know about these re-fracked wells if folks don't share their stories. 
  • The second story is, of course, all the wells that might be candidates for re-fracking.
  • A third story: the more success stories we have, the more "we" will know whether re-fracking is worthwhile or not. It certainly looks like it might be. 
  • A fourth story: this changes the decline rates significantly, doesn't it?
  • A fifth story: did EURs factor in these re-fracks?
Finally, and this is the coolest thing I've done all day. Back on July 31, 2011, I came up with a list of 25 MRO wells that were candidates for re-fracking. Some were; most weren't (not yet). But, as one example, I suggested that the following well was a candidate for re-fracking (and it was re-fracked):
  • 17216, 327, MRO, Alfred Hansen 24-11H,  Bailey, t2/09; cum 124K 10/13;
This well was re-fracked some time in early 2012, note:

BAKKEN7-201220475744504468803476218
BAKKEN6-20129180066012
BAKKEN5-2012294110392235651194462559
BAKKEN4-20120000000
BAKKEN3-201227309331843711934516256
BAKKEN2-20121124452392771785953
BAKKEN1-20120000000
BAKKEN12-20111435646422819111016
BAKKEN11-20113087793155349227636
BAKKEN10-201131934903615510

I am absolutely thrilled. I had this well, the Alfred Hansen on my list of 25 candidates for re-fracking. This was re-fracked. I'm sure there were others. I just don't have time to go through them all.

There is a lot of talk of CO2 EOR right now, but folks, there's a lot of work to do before we get to EOR. To begin with, there are 60,000 (or more) wells that need to be drilled (at 2,000/year). And that's just the middle Bakken and upper Three Forks. Add in in the lower benches of the Three Forks. Then re-fracking all the early wells that were fracked with one stage. Then, work-over of those wells that were adequately fracked but have deteriorated for some reason. Yes, as a laboratory it's nice to see folks testing CO2 EOR and water flooding, but there's plenty of work to do before we get to that.

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