BBakken SubsurfaceNorth Dakota well index

Spacing unit · Mountrail County

640-acre Bakken spacing unit

T151N R92W section 21

Spacing unit7 wells allowed · order 33303Big Bend-Bakken

Unit facts

Formation
Bakken
Acres
640
Type
Spacing unit
Land described
T151N R92W section 21
Pool
Big Bend-Bakken
Zone
Zone X
County
Mountrail County
Surveyed wells inside
7
Most wells operated by
Slawson
Unit id
dsu-3016a0e0c8a3ea271a11
Wells allowed by the latest linked order
7
Wells assigned to this unit
5
Pending permits inside
0
Balance under the allowance
0
First linked order
Feb 3, 2010
Laterals that still fit (Nov 2026 method)
0
Neighbourhood target density
9.1 two-mile laterals per 1,280 acres
Density drilled so far
7.81 per 1,280 acres

Room to drill: 0 laterals still fit at the density this unit's neighbourhood has reached (the larger of the 75th percentile of mature units within 10 miles and the median of units drilled in the last three years), placed in the widest gaps with the setbacks of the November 2026 method. 1 more would fit the density but not the spacing rule. Machine-made and geometric: not a commitment to drill, not a permit, order, lease or plan, and no economics. Land is counted once, so a unit under a larger unit shows only what the larger one left. How it is computed.

Map

Switchback 4-21UTFHSwitchback 5-21UTFHDIAMONDBACK 3-21HDIAMONDBACK 2-21HDIAMONDBACK 1-21HDIAMONDBACK 1 SLHMUSTANG 1 SLH1 mi

DMR footprint (NAD83) with the published surface locations of its wells. Laterals run under the unit; pads often sit on a neighbouring section.

Open in the regional 3D viewerFootprint, wells and production playbackSee on the cases and orders mapHistorical spacing units by order

Wells inside the unit

WellOperatorStatusLateral inside
Switchback 4-21UTFHSLAWSON EXPLORATION COMPANY, INC.Active (A)10,840 ft100%
Switchback 5-21UTFHSLAWSON EXPLORATION COMPANY, INC.Active (A)9,954 ft100%
DIAMONDBACK 3-21HSLAWSON EXPLORATION COMPANY, INC.Active (A)4,848 ft100%
DIAMONDBACK 2-21HSLAWSON EXPLORATION COMPANY, INC.Active (A)4,411 ft100%
DIAMONDBACK 1-21HSLAWSON EXPLORATION COMPANY, INC.Active (A)4,398 ft100%
DIAMONDBACK 1 SLHSLAWSON EXPLORATION COMPANY, INC.Active (A)3,670 ft76%
MUSTANG 1 SLHSLAWSON EXPLORATION COMPANY, INC.Active (A)2,580 ft51%

Surveyed Bakken-system laterals with at least 660 ft of plan-view length inside the published footprint. Geometric membership, not a legal assignment; a lateral can cross several units.

Order history

  1. Order 14127Case 11939Listed the unit in a pool zone table, 2 wells allowedEOG RESOURCES, INC.
  2. Order 15089Case 12826Pooled all interests in the unitSLAWSON EXPLORATION CO., INC.
  3. Order 16851Case 14573Listed the unit in a pool zone table, 6 wells allowedSPOTTED HAWK DEVELOPMENT, LLC
  4. Order 16860Case 14582Established the spacing unit, 6 wells allowedSLAWSON EXPLORATION CO., INC.
  5. Order 22209Case 19902Listed the unit in a pool zone table, 6 wells allowedWPX ENERGY WILLISTON, LLC
  6. Order 21993Case 19687Established the spacing unit, 3 wells allowedSLAWSON EXPLORATION CO., INC.
  7. Order 22418Case 20113Listed the unit in a pool zone table, 3 wells allowedSLAWSON EXPLORATION CO., INC.
  8. Order 28092Case 25682Listed the unit in a pool zone table, 7 wells allowedSLAWSON EXPLORATION CO., INC.
  9. Order 28250Case 25834Established the spacing unit, 7 wells allowedSLAWSON EXPLORATION CO., INC.

Facts extracted from signed NDIC orders whose land description covers this footprint; machine-extracted and not human-reviewed. A stated allowance is what that order allowed, not proof that it governs today.

Overlapping units

9 other units share a surveyed well with this one; overlapping units are not additive.