Saturday, August 19, 2017

A Confusing Well; Perhaps A Reader Has Insight -- August 19, 2017

Updates

May 18, 2019: #26419 and #17356 are about 100 feet to the west of #26007 and #26006.

November 28, 2017: regardless of what's going on, this is an incredible well:
  • 31310, 1,179, Hess, AN-Brenna-LW-153-94-3130H-1, Antelope, Sanish pool, t9/16; cum 227K 11/17; 
Monthly Production Data:
PoolDateDaysBBLS OilRunsBBLS WaterMCF ProdMCF SoldVent/Flare
SANISH9-2017301337713642694544359429661093
SANISH8-2017261527415146511031773275094033
SANISH7-201731164241640163204674446007430
SANISH6-2017301972319472539943560386394621
SANISH5-2017311977120015350832290285073482
SANISH4-2017301244412253165418123178221
SANISH3-20172914195144742132207912049235
SANISH2-2017281271812516219518252179978
SANISH1-2017312009120018276731412250406075
SANISH12-20162716638165762523248741225412367
SANISH11-2016301963219657342424274619017785
SANISH10-201631199562062253982851570627499
SANISH9-2016132071719686427626433126312

Original Post

Disclaimer: in a long note like this there will be factual and typographical errors. I may be seeing things that don't exist. If this is important to you, go to the source.

Look at this post. I am still unable to explain the jump in production in 9/16 of #25961. [Update, January, 2018: just prior to the jump in production: a work-over rig on site, and a new pump put in; no evidence that is was re-fracked; no sundry form to suggest a re-frack and FracFocus does not show a re-frack.]

Note that all three wells on this 3-well pad were taken off-line 8/16, and then brought back on line in the next month or so. Generally, when one sees that, it means that a neighboring well was fracked.

In this case, when I originally looked at these three wells, I could find no evidence of a neighboring well being fracked.

Today, I took another look.

It turns out a neighboring well was fracked 8/16, the very month that these three wells were taken off-line.

But it still doesn't make sense.

All three wells showed a bump in production, though the Three Forks wells showed a minimum jump in production whereas the middle Bakken well showed a hug jump in production (from 5,000 bbls/month to 14,000 bbls / month). The jump in production did not last particularly long, but it's hard to believe the jump in production from 6,000 bbl/s month to 14,000 bbls/month was due to "recharging" when the well was off-line for less than a month.

I found the well that was fracked in 8/16 that was probably the reason for BR taking these wells off-line:
  • 31310, 1,179, Hess, AN-Brenna-LW-153-94-3130H-1, Antelope, Sanish pool (Three Forks), t9/16; cum 176K 6/17; a "small" frack, only 3.1 million gallons of water; 13% sand by weight;
The graphic:


Again, there are many, many problems with this:
  • distance between horizontals;
  • different formations;
  • closer horizontals, targeting same formations, jump in production much less than #25961
I still feel uncomfortable with this one but another good example of the peculiarities of the Bakken. 

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