Bakken -well performance by field over time

October 2015

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)
2014 2015 2016 2014 2015 2016
H1 H2 H1 H2 H1 H1 H2 H1 H2 H1
PARSHALL 137 30 53 29 19 6 1104 817 815 680 728
GRAIL 134 39 45 17 19 14 694 973 1122 972 888
SANISH 127 32 30 30 22 13 450 543 550 520 629
SIVERSTON 113 20 34 20 15 24 543 584 556 533 424
ALGER 103 12 38 33 10 10 417 443 384 509 556
CORRAL CREEK 98 1 4 2 56 35 651 820 561 374 471
TRUAX 97 18 29 29 21 597 571 541 926
ANTELOPE 94 22 28 17 11 16 944 814 892 995 915
ROBINSON LAKE 91 23 25 12 21 10 489 561 478 572 503
ALKALI CREEK 80 12 9 35 17 7 672 756 773 605 635
BANKS 76 25 16 13 13 9 516 491 608 616 806
BIG BEND 62 8 26 5 16 7 523 588 613 369 448
CAMP 60 15 18 6 4 17 515 671 563 893 689
BLUE BUTTES 58 8 10 11 19 10 1075 1036 1037 825 789
EAST FORK 58 7 6 14 22 9 601 467 488 691 677
HAWKEYE 58 9 24 15 4 6 898 855 966 741 694
REUNION BAY 52 11 15 9 13 4 695 787 786 757 567
SAND CREEK 51 2 3 29 10 7 477 1024 692 574 876
WESTBERG 51 16 11 13 8 3 657 602 735 699 810
BAKER 50 15 3 7 19 6 253 402 595 607 507
STOCKYARD CREEK 50 14 12 9 11 4 534 514 348 887 903

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.

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