The ND Bakken horizontal well database lists 347 fields.
241 contain at least one well with peak production after 2013. 115 fields had more than 10 such wells in that period.
The table below shows the 21 fields with at least 50 wells with IP30 (oil) after 2013.
The numbers for the first half of 2016 are preliminary and should be viewed with caution.
|Name||Nb tot.||Nb Wells||IP 30 (b/d – oil)|
Not all fields show an improving performance in 2015 over 2014. The fields with the best wells in 2014, Parshall (best performance in 2013) and Blue Buttes, seem to be in terminal decline. Two other fields with above average 2014 wells, Coral Creek and Hawkeye, show also declining well performances. Fields with increasing well performances are Alger (still below average), Banks, Baker, East Fork, Stockyard Creek and Truax. The other fields do not show clear trends.
The unweighted average IP30 performance of the 21 top fields since the beginning of 2014 is relatively flat, oscillating in the 650 b/d to 670 b/d range. That’s somewhat surprising in view of all the talk about high grading and high intensity completions. It looks as if high grading and the increasing use of enhanced/high intensity completions within the presented top fields is just matching the effects of geological limits and drilling saturation.
The fields with less than 50 wells with IP30 after 2013 show generally below average IP30, with some notable exceptions. The best fields in that category with at least 10 wells are Spotted Horn (43 wells, >1000 b/d), McGregory Buttes (38 wells, around 1000 b/d), Eagle Nest (35 wells. > 900 b/d) and Twin Valley (10 wells, > 1000b/d). All mentioned b/d numbers are IP30 numbers and the well numbers are the total number for the last 3 years.
Unweighted average IP30 of the top fields used to be 10% to 15% above average Bakken IP30. That gap started to close in the 2nd half of 2015 because of an above average completion decline in the less productive fields.
What the table doesn’t show are the decline rates. The last half year with wells having a one year production history after IP30 is 2015-H1. The increasing part of wells with high intensity completions after 2015 H1 is not reflected in those numbers.
What’s notable is that the wells in the fields Blue Buttes and Hawkeye had consistently very high decline rates in the observed period, amounting to an approx. decline of 85% IP30 y/y. Parshall and Truax show a significant worsening of their decline rates in that period and have joined the 85% club.