Tuesday, March 8, 2016

Explain To Me, Again, The Bakken Decline -- March 8, 2016

I track the four Zavanna Simmental wells here; these are east of Williston. Note the jump in production between December, 2015, and January, 2016, both 31-day months of production.

This is one of them, updated:
  • 28594, 1,676, Zavanna, Simmental 2-11 4TFH, Long Creek, 50 stages, 5.8 million lbs, t5/15; cum 127K 1/16:
PoolDateDaysBBLS OilRunsBBLS WaterMCF ProdMCF SoldVent/Flare
BAKKEN1-20163122607211713250453842515101870
BAKKEN12-20153110600105215097722086202951329
BAKKEN11-201572790257314273665832403314
BAKKEN10-201527195731910039436378902716310325
BAKKEN9-201520886203873514784128161670
BAKKEN8-20151913378124391678221625199461396
BAKKEN7-2015312066119351252303422733461304
BAKKEN6-20151216216157851701022997170915727
BAKKEN5-201512122831204213745982509646

I did not find a sundry form that might have helped explain the surge in production (shown in red). Gas lift was installed / effective as of August 2, 15, some three to four months earlier.

Some data points from the well file:
  • spud July 20, 2014 
  • TD: 21,835'; October 23, 2014
  • total drilling days: 28 days
  • 94% within first bench, TF
  • gas lift effective 8-2-15
  • Three Forks well
  • first bench: estimated to 25' thick
  • target zone: 6' thick 
  • first bench thinned to about 2' beginning at approximately 17,465 feet
  • drilled toward the south
  • 94% borehole within the first bench
  • "The Three Forks formation is a complex petroleum system within the Williston Basin that is sourced by the Lower Bakken Member."
  • "There are varying facies within the Three Forks which are commonly referred to as 'benches.' The first bench of hte Three Forks is  the zone of interest for this well. It is comprised of lime mudstone-packstone ..."
  • "The overall gas trend of this well suggests the gas was the highest in the areas proximal to or within the ideal taret zone. Background gas averaged 1,800 units, with gas shows ranging from approx 1,500 - 4,500 units. the largest gas reading was near the end of the lateral, just above the target zone, and measured 4,491 units at a measured depth of 21,813 feet.
  • This well had significantly lower gas readings in comparison to the other three vertical/curves drilled on the Simmental location. The Middle Bakken has gas shows ranging from 113 - 208 units.
The Zavanna Gust wells in this same section have been taken off line or are on the SI/NC list. 

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