🛢️ TUFTO 6-7-18-19F 2TFH

DEVON ENERGY WILLISTON, L.L.C · Williams County, ND · File #API 3310506796 · Generated 2026-02-13 12:33

API: 3310506796
Target Formation: Bakken / Three Forks Petroleum System
Permit Explained: Yes

📋 Permit Cycle Assessment

The permit approval dated 02/06/2026 is justified by documented contemporaneous submissions addressing four categories of regulatory concern: (1) shallow aquifer protection via Mowry formation drilling restrictions and mud logging; (2) cement isolation verification through CBL with zero-pressure testing on surface and intermediate casings; (3) anti-collision avoidance through offset well spacing confirmation; and (4) surface occupancy and landowner notification per NDCC 43-02-03-16 for wells within 1,000 feet of dwellings. The directional survey (measured depth, inclination, azimuth) provided in the APD confirms compliance with Bakken spacing unit setback boundaries (150 feet N/S, 1,220 feet E/W). All permit conditions reflect regulatory risk mitigation consistent with well geometry, location, and formation-specific drilling standards (Bakken/Three Forks system). No unexplained approvals or waivers identified.

🔍 Permit Cycle Signals (5)

Mowry Formation penetration restriction on 17-1/2-inch surface hole with mud logger requirement at no greater than 30-foot sample intervals

Direct

📄 Conditions of Approval section, API 3310506796
📅 02/06/2026 (Exact confidence)

Regulatory stipulation imposed as condition of permit approval to protect shallow aquifer and Mowry Formation. Requires active mud logging from surface to TD of 17-1/2-inch hole to monitor for unintended penetration.

Cement Bond Log (CBL) requirement on 13-3/8-inch deep-set surface casing with zero-pressure pass verification and director notification protocol for unusual pressures

Direct

📄 Conditions of Approval section, API 3310506796
📅 02/06/2026 (Exact confidence)

Non-routine cementing verification tied to well geometry and casing design. CBL with zero-pressure pass and immediate notification to NDIC if pressures exceed tolerance conditions the permit approval on cement isolation quality.

Anti-collision review completed; operator confirmed wells within 500 feet addressed in permitting file

Supporting

📄 Operator Assertions section (Form line: 'Has the operator reviewed any wells within 500' of the proposed wellbore and addressed anti-collision concerns?')
📅 01/22/2026 (Exact confidence)

Anti-collision analysis documented as completed prior to permit submission. Well location plat shows TUFTO 6-7-18-19F 3H and other adjacent wells. Directional geometry (lateral extends to 21,432 feet south at TD) requires offset well spacing confirmation.

Surface use agreement and landowner notification (1,320 feet radius) executed for off-spacing wellhead location within 1000 feet of occupied dwelling

Supporting

📄 Operator Assertions and affidavit sections; dated 06/20/2026 and 01/30/2025
📅 01/30/2025 (Exact confidence)

Well wellhead located within 1,000 feet of occupied dwelling (Smith property). Landowner affidavit and notification letter dated 1/30/2025 document operator compliance with NDCC 43-02-03-16 requirement for occupied dwelling notice and surface use agreement prior to drilling.

Bakken spacing unit (2,560 acres: Sections 6, 7, 18, 19, T155N, R100W) setback requirements enforced: 150 feet north/south boundary, 1,220 feet east/west boundary per Commission policy

Direct

📄 Stipulations section and Bakken Setback Summary Statement
📅 02/06/2026 (Exact confidence)

Permit approval conditioned on lateral not penetrating boundaries closer than specified setbacks. Directional points confirm 626 feet south and 21,431 feet south coordinates at TD, within 150 FNL limit at KOP and target depth.

📖 Historical Context (2)

Federal permit coordination requirement: Spacing unit Sections 6, 7, 18, 19 T155N R100W may be subject to BLM permit jurisdiction
📄 Email from Neigum, Emma V., Engineering Technician, NDIC Oil and Gas Division, referencing BLM Dickinson office coordination · 📅 Unknown
Federal mineral interests or trust lands within spacing unit require parallel BLM approval process. Operational timeline and drilling authorization contingent on BLM permit issuance if mineral rights affected. Affects future drilling windows and operational constraints.

Adjacent spacing unit operator (Devon) compliance with NDIC Order 31973 notification requirement: operator-to-operator notification of directional and completion plan details waived because Devon operates both units
📄 Letter from Devon to NDIC re: NDIC Order 31973 compliance, dated in permit file · 📅 Relative | Pre-permit
Demonstrates Devon's control of contiguous spacing units (Sections 6, 7, 18, 19 and 31/156N/100W pad location). Eliminates third-party operator notification requirement but creates internal operational responsibility for well spacing, drainage protection, and correlation across units. Affects future infill drilling location planning and completion sequencing.

🔧 Operator Pattern

Devon Energy Williston, LLC operates multiple wells on multi-section Bakken pad (Tufto North) in contiguous spacing units, exercising operational control over well placement, completion design, and sequencing across unified acreage.
Well location plat identifies TUFTO 6-7-18-19F 2TFH and TUFTO 6-7-18-19F 3H on same pad (SW SE Section 31); Devon letter confirms operator status for adjacent spacing unit Sections 6, 7, 18, 19; directional geometry shows lateral landing in Sections 6 and 19 with 21,432-foot measured depth south, indicating multi-section drainage strategy within single operator control.

Confidence: High
Permit approval date (02/06/2026) is explicit and anchored. Contemporaneous supporting documents (APD dated 01/22/2026, directional survey, affidavits dated 01/30/2025 and 06/20/2026, site location plat drafted 11/3/2025) are all present in file with clear regulatory traceability. Conditions of Approval explicitly state permit requirements (Mowry restriction, CBL, setbacks, anti-collision). No dates are missing from critical permit-cycle signals. Anti-collision and landowner notification assertions are confirmed by dated affidavits. NDIC Field Order Info and Bakken Setback Summary Statement directly cite Commission policy. Historical signals (federal coordination, NDIC Order 31973) present in file but not dated; marked as non-routine but secondary to permit approval justification.