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Occupational Safety and Health Administration OSHA

Inspection Detail

Inspection: 307816330 - Nabors Drilling Usa Lp

Inspection Information - Office: Wyoming

Nr: 307816330Report ID: 0855610Open Date: 03/31/2006

Nabors Drilling Usa Lp
Sec28, T25n, R96w
Wamsutter, WY 82336
Union Status: NonUnion
SIC: 1381/Drilling Oil and Gas Wells
NAICS: 213111/Drilling Oil and Gas Wells
Mailing: 515 West Greens Road, Huston, TX 77067

Inspection Type:Accident
Scope:Partial Advanced Notice:Y
Safety/Health:Safety Close Conference:04/01/2006
Emphasis: L:OildrillClose Case:10/06/2006

Related Activity:TypeIDSafetyHealth

Violation Summary
Serious Willful Repeat Other Unclass Total
Initial Violations 3 3
Current Violations 3 3
Initial Penalty $8,750 $0 $0 $0 $0 $8,750
Current Penalty $8,750 $0 $0 $0 $0 $8,750
FTA Amount $0 $0 $0 $0 $0 $0

Violation Items
# ID Type Standard Issuance Abate Curr$ Init$ Fta$ Contest LastEvent
  1. 01001 Serious OD030001 BIV 07/27/2006 08/29/2006 $5,000 $5,000 $0 I - Informal Settlement
  2. 01002 Serious OD070004 AII 07/27/2006 08/29/2006 $1,875 $1,875 $0 I - Informal Settlement
  3. 01003 Serious OD060003 A I B 07/27/2006 08/29/2006 $1,875 $1,875 $0 I - Informal Settlement

Accident Investigation Summary
Summary Nr: 200980696Event: 03/30/2006Employee Is Struck By Chain Tongs And Later Dies
Rig workers were in the process of changing out a saver sub, which is a section of pipe positioned between the Kelly and pipe. At this time, the depth of the hole was 11,908.2 ft. During the process of adding a section of pipe the evening tower crew dropped the pipe string about six feet. After picking up the pipe string and setting the Kelly, drilling commenced for approximately 100 feet. Because the pipe string was dropped, the decision was made to trip the hole and check the "bottom-hole assembly" bit and mud motor. After tripping to 4,289.8 ft, the chain on the input sprocket for the draw works became loose breaking teeth on the sprocket and shutting down the operation. The sprocket had to be replaced before drilling operations could continue. With the sprocket replaced, the Pusher was on the brake handle and picked up on the slips to see if the pipe would move. It would not. He estimated the down-hole string weight was approximately 150,000 pounds. They could pull up to 70 percent of the string weight. The rotary transmission was placed in low, low/forward, with the table rotating in a clockwise direction. They picked up the pipe string and pulled to 220,000 pounds, rotating the rotary clockwise while attempting to drill through the stuck position. This procedure was not only stretching the drill pipe but also twisting and coiling it as well. The attempt to drill through the stuck position was not successful. The crew had the pipe string in the slips and then rotated (counter-clockwise) untwisting the pipe string. The Pusher picked up on the Kelly to change the saver sub that had pulled threads from the previous hole. Once the new sub was placed in the pipe string, Employee #1, the driller, went into the doghouse to get the chain tongs. The chain tong was fitted with a 37-in. handle and is designed to grip pipe in either direction. Returning to the drill floor, Employee #1 placed the chain tong on the saver sub to tighten it up. The assistant driller raised the Kelly approximately 3-in. to 4-in. above the saver sub, to make it easier to tighten the sub to the pipe string. When Employee #1 began to tighten the saver sub to the pipe string, the pipe string began to uncoil (counter-clockwise) at a very high rate of speed. While Employee #1 was holding onto the handle of the chain tong, he was lifted from the drill floor and forced backwards into the draw works causing him to loose his grip on the handle. Employee #1 began falling to the drill floor. As the pipe was uncoiling, the handle on the chain tong struck Employee #1 several times to the body and head before reaching the drill floor. Employee #1 was transported to the hospital where he died.
Keywords: chain, fracture, drill pipe, oil well drilling, kelly bushing, struck by, tongs
Inspection Degree Nature Occupation
1 307816330 Fatality Fracture Supervisors, extractive occupations

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