CORPS OF ENGINEERS 31-10

RIM OPERATING, INC. · McKenzie County, ND · File #11920 · Generated 2026-10-14 06:31

API: 3305302148
Target Formation: RED RIVER
Permit Explained: Yes

Permit Cycle Assessment

The permit action (plug-back to ~3500' for sidetrack) is directly explained by the operator's stated intent in Form 264521. Pre-permit casing integrity testing supports the operational safety of the plan. The subsequent plugging report confirms the work was executed as approved.

Permit Cycle Signals (3)

Intent to plug-back well to ~3500', cut & pull top 3500' of 5.5" casing, and set balanced kick off plug on top of remaining 5.5" casing stub for use in sidetracking and re-drilling well to Red River.

Direct

SUNDRY FORM FOR WELL FILE NO.: 11920 (Form ID: 264521) - DESCRIPTION (OPERATOR) and PLUGGING SPECIFICATIONS
2025-08-18 (Exact confidence)

Directly states the objective: preparation for re-entry/re-drill sidetrack wellbore. This is the primary justification for the plug-back permit.

Notification of Work Performed: casing integrity test passed on bridge plug set at 2,965' KB to further isolate current wellbore in preparation for re-entry/re-drill sidetrack.

Supporting

SEXFE OF NORTH ONES WELL SUNDRY FORM (Form ID: 273122) - DESCRIPTION (OPERATOR)
2025-10-01 (Exact confidence)

Pre-permit work (casing test) directly validates wellbore integrity for the subsequent sidetrack operation, a prerequisite for safe plug-back and re-drill.

Plugging report confirms execution of plug-back procedure as specified in Form 264521, including setting of balanced cement plug and removal of production casing.

Direct

WELL COMPLETION OR PLUGGING REPORT FOR 11920 - PLUGGING INFORMATION and FEATURES & CEMENT
2025-08-28 (Exact confidence)

Documents the completion of the approved plug-back work, closing the permit cycle. The report is approved by NDIC (Cody VanderBusch) and field inspector (Mark Binns).

Historical Context (3)

Persistent wellbore integrity issues: tight/collapsed casing in Dunham Salt (~6661') and Prairie Salt intervals noted in 1999 and 1994 workovers. A 'tight spot in casing' is formally recorded in the 2025 plugging report.
Multiple: 1999 Sundry Forms detailing collapsed casing; 2025 WELL COMPLETION OR PLUGGING REPORT - Feature: Tight Spot in Casing 1. · 1999-09-21 | 2025-09-23
Casing restrictions in salt sections are a persistent geological risk that will constrain any future re-entry, milling, or fishing operations in the old wellbore.

Historical fish in hole: 4539' of 2-7/8" tubing fish noted as unrecoverable below tight spot at ~6650' (Dunham Salt) in 2025 plugging specifications.
SUNDRY FORM FOR WELL FILE NO.: 11920 (Form ID: 264521) - PLUGGING SPECIFICATIONS, step 6. · 2025-08-18
The presence of a significant fish in the old wellbore below the planned plug-back depth is a major obstruction that will limit future work in the original hole and must be considered in sidetrack planning.

Location within Missouri River floodplain has led to repeated production shut-ins due to flooding (2018, 2015, 2012, 2011, 2010, 1995). NDIC issued specific flood warning/guidance letter in 2014.
Multiple Sundry Notices (Form 4) for shut-ins; May 13, 2014 letter from Richard S. Dunn (NDIC). · 2014-05-13 | Multiple
The wellsite's flood risk is a permanent siting constraint affecting all future operations, requiring special contingency planning for equipment protection, site access, and environmental protection.

Operator Pattern

Operator has consistently performed remedial workovers and stimulations (acid jobs) to maintain production from aging Red River/Duperow completions, and has now shifted to a plug-back and sidetrack strategy for re-development.
Workovers in 1994 (acid stim), 1996 (acid stim), 1999 (attempted Red River stim, then recompletion to Duperow), and 2025 (plug-back for sidetrack).

Confidence: High
Core permit-cycle documents (Form 264521 intent, Form 273122 test report, Form 6 plugging report) are present, clear, and temporally sequenced around the 2025 permit approval date. Historical constraints are well-documented across decades of filings.