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Occupational Safety and Health Administration OSHA

Accident Report Detail

Accident: 14557557 - Oil Well Valve Ruptured; Piece Struck Employee

Accident: 14557557 -- Report ID: 0653510 -- Event Date: 07/08/1985
InspectionOpen DateSICEstablishment Name
295741307/09/19851389Permian Servicing Co Inc
InspectionOpen DateSICEstablishment Name
295713207/10/19851311Great Western Drilling Co
InspectionOpen DateSICEstablishment Name
295741307/09/19851389Permian Servicing Co Inc
ON JULY 8, 1985, THE EMPLOYEES WERE PREPARING TO BACKFLOW AN OIL AND GAS WELL AFTER TREATING IT WITH 20% HYDROGEN CHLORIDE COMBINED WITH 700 STANDARD CUBIC FEET OF NITROGEN. A FLOW LINE CONSISTING OF A WACO MODEL DR 150 W PLUG VALVE, A HUBER-HERCULES 460 T JUNCTION, A WALWORTH 1796 (200 WOG) PLUG VALVE AND A THORNHILL CRAVER UNIBOLT ADJUSTABLE CHOKE WITH A ONE INCH ORIFICE. THE CHOKE VALVE WAS CONNECTED TO A HIGH PRESSURE HOSE LEADING TO A FRAC TANK. THE PRESSURE IN THE OIL AND GAS WELL WAS MEASURED AT 3150 PSIG WHEN THE FLOW LINE WAS INSTALLED. ALL VALVES WERE OPEN EXCEPT THE WACO PLUG VALVE, WHICH WAS LEAKING. THE CHOKE VALVE WAS OPEN TO A SCALE READING OF 12/64. BEFORE THE WACO VALVE COULD BE OPENED, APPROXIMATELY 600 PSI OF PRESSURE DEVELOPED IN THE PUMPING "T". THE WALWORTH PLUG VALVE RUPTURED, BREAKING THE CASING INTO AT LEAST TWO SECTIONS. ONE SECTION STRUCK EMPLOYEE #1 ON THE LEFT SIDE OF HIS HARD HAT, SMASHING THE HAT AND CAUSING SEVERE INJURIES TO HIS HEAD. HE WAS KILLED. TWO OTHER EMPLOYEES WERE INJURED.
Keywords: head, valve, rupture, high pressure, oil well servicing, struck by, flying object
Employee # Inspection Age Sex Degree Nature Occupation
1 2957413 Fatality Concussion Drillers, oil well
2 2957132 Occupation Not Listed
3 2957413 Hospitalized injury Bruise/Contus/Abras Drillers, oil well
4 2957413 Hospitalized injury Hearing Loss Drillers, oil well

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