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Industrial Safety

CSB releases update of deadly drilling rig fire investigation

Five workers were killed when natural gas was released from Pryor Trust well in Oklahoma

by Jeff Johnson, special to C&EN
August 17, 2018

20180817lnp3-fire.jpg
Credit: U.S. Chemical Safety Board
A drilling rig fire killed five workers at a Pryor Trust natural gas well in Oklahoma.

A natural gas well blowout and fire on Jan. 22 killed five workers at a Pryor Trust gas well located in Pittsburg County, Okla. The incident occurred while workers were attempting to remove a drilling pipe and replace a worn drill bit.

Pressure from adding drilling mud and weighted liquids were insufficient to offset and block explosive natural gas from exiting the 4,000 m well, the U.S. Chemical Safety & Hazard Investigation Board (CSB) said on Aug. 16 in a factual update of its ongoing investigation.

CSB notes that workers were unable to fully activate a blowout preventer and block the gas, oil, and mud as it exited the well. The accident occurred one week after drilling began and the fire burned for eight hours until crews were able to activate the preventer. The well was operated by Red Mountain Operating and the drilling was done by Patterson-UTI Drilling Company.

CSB released a video animation of the accident, but a report is likely to be a year away. CSB is increasing factual updates it releases, notes board spokesperson Hillary Cohen. “We want to update stakeholders, the public, and industry, throughout the course of the investigation,” she says.

Credit: CSB
A Chemical Safety Board animation describes the events that led up to a blowout that killed five workers at a Pryor Trust Gas Well in Okalhoma.
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