CONSUMERS ENERGY CO

Incident Narrative

"ON OCTOBER 4 AT APPROXIMATELY 09:50, CONSUMERS ENERGY GAS TRANSMISSION EMPLOYEES WERE EXCAVATING TO EXPOSE A WELLHEAD FOR ANNULAR MONITORING WHEN THEY INADVERTENTLY STRUCK AN ABOVE-GRADE CASING VALVE AND NIPPLE. THIS CONTACT CAUSED A LEAK AT THE NIPPLE/WELLHEAD INTERFACE OF CRANBERRY LAKE WELL C-243, LOCATED IN SUMMERFIELD TOWNSHIP, CLARE COUNTY, MICHIGAN. INSPECTION REVEALED THAT THE CASING VALVE AND NIPPLE WERE COMPROMISED AT THE CASING HEAD. THE SITE WAS IMMEDIATELY SECURED, AND PERSONNEL ENSURED PUBLIC SAFETY BY MAINTAINING A SAFE PERIMETER. FOLLOWING INTERNAL ASSESSMENT, THE SITUATION WAS CLASSIFIED AS A LEVEL ONE WELL CONTROL EVENT, WITH CONTINGENCY PLANS IN PLACE TO ESCALATE TO LEVEL TWO IF NECESSARY. A THIRD-PARTY CONTRACTOR WAS ENGAGED TO SAFELY KILL THE WELL BY PUMPING BRINE INTO THE TUBING TO EQUALIZE PRESSURE AND STOP GAS FLOW. ONCE THE WELL WAS CONFIRMED TO BE SAFELY KILLED, THE DAMAGED COMPONENTS WERE REMOVED, THE CASING HEAD THREADS WERE VISUALLY INSPECTED, AND A NEW VALVE AND NIPPLE WERE INSTALLED. THE WELL REMAINED OUT OF SERVICE PENDING INTEGRITY VERIFICATION AND FOLLOW-UP WORK. FOLLOWING THE WELL CONTROL EVENT, WELL C 243 WAS REMEDIATED THROUGH THE ACTIONS OUTLINED BELOW. THE WELLSITE WAS SECURED, PROPERLY BACKFILLED, AND SUPPORTED FOR THE CE WORKOVER RIG. ONCE THE RIG ARRIVED ON LOCATION, STANDARD WELL KILL OPERATIONS WERE CONDUCTED; HOWEVER, THE WELL HAD ALREADY BEEN KILLED DURING THE INITIAL CONTROL EFFORTS. BLOW OUT PREVENTERS (BOP) WERE INSTALLED, AND PRESSURE TESTING WAS COMPLETED. THE TUBING WAS THEN REMOVED AND THE WELLBORE WAS ISOLATED. ADDITIONAL SURFACE LEVEL NDT METHODS AND EXAMINATIONS WERE PERFORMED TO VERIFY COMPONENT INTEGRITY. THE WELLSITE WAS SUBSEQUENTLY EXCAVATED FOR INSTALLATION OF THE ANNULUS MONITORING PORT. THE RIG THEN REMOVED THE WELLBORE PLUG AND RAN TUBING BACK INTO THE WELL. FOLLOWING THIS, THE WELL WAS TESTED AND NORMAL OPERATIONS RESUMED ON OCTOBER 28, 2025."