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Occupational Safety and Health Administration OSHA

Accident Report Detail

Accident: 14548234 - High Pressure In Wellhead Blew, Injuring Employees

Accident: 14548234 -- Report ID: 1050210 -- Event Date: 05/06/1985
InspectionOpen DateSICEstablishment Name
253138205/08/19851381Pool Arctic Alaska Rig 102
InspectionOpen DateSICEstablishment Name
253139005/07/19851389F M C Well Head Equipment Div
InspectionOpen DateSICEstablishment Name
253138205/08/19851381Pool Arctic Alaska Rig 102
THE EMPLOYEES WERE CHANGING TUBING STEEL AT THE WELLHEAD. EMPLOYEE #3 BACKED DOWN THE LOCKING SCREWS OF THE "PACK OFF", LOCATED BETWEEN THE SEVEN INCH CASING AND THE 10 3/4 INCH SURFACE PIPE. THERE WAS ABOUT 850 PSI IN THE ANNULUS OF THE WELL BELOW THE "PACK-OFF". WHEN THE LAST LOCK-DOWN SCREW WAS LOOSENED, THE "PACK-OFF" FLEW OFF ITS SEAT. THE "ARCTIC PACK" FLUID WAS EJECTED UNDER GREAT PRESSURE. THE FOUR EMPLOYEES WERE KNOCKED BACKWARDS BY THE RELEASE OF HIGH PRESSURE. THE WELLHEAD EQUIPMENT WAS MANUFACTURED BY THE F.M.C. CORPORATION (GENERATION ONE). EMPLOYEE #1 RECIEVED A DISLOCATED SHOULDER. EMPLOYEES #2 AND #3 RECIEVED "ARCTIC PACK" SKIN PENETRATIONS. EMPLOYEE #4 RECIEVED A FRACTURED VERTEBRA AND HEAD LACERATIONS. NONE OF THE EMPLOYEES THOUGHT TO CHECK THE PRESSURE IN THE ANNULUS BEFORE LOOSENING THE LOCK-DOWN SCREWS.
Keywords: head, shoulder, laceration, fracture, maintenance, oil well drilling, high pressure, struck by, wellhead, vertebra
Employee # Inspection Age Sex Degree Nature Occupation
1 2531382 Non Hospitalized injury Dislocation Drillers, oil well
2 2531390 Hospitalized injury Fracture Drillers, oil well
3 2531390 Non Hospitalized injury Other Drillers, oil well
4 2531382 Non Hospitalized injury Other Drillers, oil well

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