CONSUMERS ENERGY CO

Incident Narrative

ON JUNE 15, 2024 AT APPROXIMATELY 15:18 HOURS CONSUMERS ENERGY GAS CONTROL RECEIVED NOTIFICATION OF A DAMAGE AT THE WINTERFIELD STORAGE FIELD, MARION TOWNSHIP, MICHIGAN (OSCEOLA COUNTY). GAS OPERATIONS STORAGE EMPLOYEES ARRIVED ONSITE, CONFIRMED THE DAMAGE TO W-905, AND IMMEDIATELY SHUT-IN THE WELL LINE (WL-905). DESPITE THIS, GAS CONTINUED TO RELEASE, INDICATING A LOSS OF CONTROL. THE WELL BLOWOUT CONTINGENCY PLAN WAS THEN IMPLEMENTED. AN INVESTIGATION DETERMINED A CONTRACTOR WORKING ON BEHALF OF AUTUMN VISTA DAIRY USING A TRACTOR AND TANKER TO SPREAD FERTILIZER, HAD BACKED INTO THE WELLHEAD, CAUSING A RELEASE OF GAS, AND DAMAGING THE WELLHEAD AND SURFACE COMPONENTS, MAKING THE WELL INCAPABLE OF ISOLATION. UPON DETERMINING THE LOSS OF CONTROL, PERSONNEL BEGAN EVALUATING THE SITE TO DETERMINE IMMEDIATE NEEDS AND REMAINED ONSITE UNTIL COMPLETE ISOLATION OF THE WELL WAS ACHIEVED. CONSUMERS ENERGY CONTACTED CUDD EMERGENCY WELL RESPONSE (CONTRACTOR), INFORMING THEM OF THE INCIDENT AND REQUESTING ASSISTANCE. BOTH CONSUMERS ENERGY AND CUDD MOBILIZED AT THE SITE ON JUNE 16, 2024 TO BEGIN PLANNING AND IMPLEMENTING THE WELL KILL OPERATION. TWO ATTEMPTS TO KILL THE WELL BY SUPPRESSING IT WITH LIQUIDS WERE UNSUCCESSFUL, LEADING TO A DECISION TO USE A VENDOR SPECIALIZED BLOW OUT PREVENTER (BOP) TO ISOLATE AND GAIN CONTROL OF THE WELL. ON JUNE 19, 2024, THE WELLBORE WAS SUCCESSFULLY ISOLATED USING A CUDD BLOWOUT PREVENTER AND AN ASI-X PACKER WAS SET AND TESTED. CUDD'S BOP WAS REMOVED AND REPLACED WITH A COMPANY BOP. FURTHER ACTION INCLUDES PREPARATION FOR THE COMPLETE WELL REMEDIATION, WHICH WILL INVOLVE INTEGRITY DIAGNOSTIC EVALUATIONS THROUGH LOGGING AND MECHANICAL INTEGRITY TESTING. THE WELL COMPLETION WILL ALSO INCLUDE INSTALLING NEW TUBING, NEW API 6A SURFACE EQUIPMENT, AND CONNECTING PIPELINE.