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Occupational Safety and Health Administration OSHA

Inspection Detail

Inspection: 309786689 - Patterson-Uti Drilling Company

Inspection Information - Office: Oklahoma City


Inspection Nr: 309786689
Report ID: 0627700
Date Opened: 07/07/2006

Site Address:
Patterson-Uti Drilling Company
1 & 7/10 Miles Sw Of Hinton, Ok
Hinton, OK 73047

Mailing Address:
P.O. Box 1416, Snyder, TX 79550

Union Status: NonUnion


NAICS: 213111/Drilling Oil and Gas Wells

Inspection Type: Accident

Scope: Complete

Advanced Notice: N

Ownership: Private

Safety/Health: Safety

Close Conference: 01/05/2007

Emphasis: L:Oilgas

Case Closed: 09/10/2007

Related Activity
Type Activity Nr Safety Health
Accident 100644772
Violation Summary
Violations/Penalties Serious Willful Repeat Other Unclass Total
Initial Violations 1 1
Current Violations 1 1
Initial Penalty $5,000 $0 $0 $0 $0 $5,000
Current Penalty $5,000 $0 $0 $0 $0 $5,000
FTA Penalty $0 $0 $0 $0 $0 $0

Violation Items
# Citation ID Citaton Type Standard Cited Issuance Date Abatement Due Date Current Penalty Initial Penalty FTA Penalty Contest Latest Event Note
1. 01001 Serious 5A0001 01/05/2007 01/23/2007 $5,000 $5,000 $0 01/31/2007 I - Informal Settlement  

Investigation Summary

Investigation Nr: 200643518
Event: 07/06/2006
One Employee Is Killed And Two Are Injured At Drilling Rig

On July 6, 2006, Employees #1, #2, and #3 were drilling an oil and gas well. They were preparing to insert a 30-foot section of drilling pipe into the nearly 6,500-foot-long drilling string. Their coworker, the driller, was operating the draw works. He had pulled most of the kelly out of the well, when he felt a bump. Employees #1 and #3 were on the west side of the drill rig, preparing to connect the kelly to the new section of drill pipe, while Employee #2 was on the racking board, preparing the power tongs to disengage the kelly from the string. Suddenly, there was a loud noise, and the crown sheave shaft came out of one of its mounts, allowing the five sheaves, the drilling line, the 165,000-pound drilling string, and the blocks to fall to the drilling floor. Employee #1's right leg was trapped under the blocks and nearly amputated. He sustained severe blood loss, and he was killed as a result of his lacerations. Employee #2 was under Employee #1 and suffered a head wound. He was hospitalized for his lacerations. Employee #3 had a head wound and multiple right leg fractures. He was hospitalized too. The driller had minor abrasions and contusions. This is no mention of him on the injury lines. The reason that the shaft pulled out of one of its pillar blocks was that the shaft retaining bolt (similar to a set screw) did not sufficiently penetrate the shaft receptacle. This oversight allowed the end of the shaft move about and enlarge the pillar block shaft hole. After a while, the shaft end could move in and out of the pillar block, until, by the time of the accident, the shaft pulled entirely free of the pillar block. Then the second pillar block's supporting steel structure failed, letting the freed shaft end deflect downwards and allowing the unrestrained sheaves to fall. Underlying these failures were inadequate inspections of the mast, including the crown assembly. The moving shaft had distended the pillar block, causing an observable gap between the two. Two cracks, not associated with the accident, were observed on the crown structure. Two bolts and a nut were found on the crown after the accident; their placement could not be ascertained, and they were not damaged. The mast secondary structure had numerous sections bent or otherwise damaged; the employer, upon completion of an in-depth inspection, replaced upwards of twenty-five percent of the upper mast secondary structure.

Keywords:head, inadequate maint, drill pipe, kelly bushing, laceration, drill rig--non-oil, struck by, falling object, oil rig, leg

Investigated Inspection
# Inspection Age Sex Degree Nature Occupation
1 309786689 Fatality Cut/Laceration Occupation not reported
2 309786689 Hospitalized injury Cut/Laceration Occupation not reported
3 309786689 Hospitalized injury Fracture Occupation not reported
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