The CSB has published the report in the blowout that occurred in Oklahoma and killed five guys. It makes for shocking reading and this should be read by all involved in drilling operations.
The CSB’s report determined that the cause of the blowout and rig fire
was the failure of two preventive barriers that were intended to be in
place to stop a blowout.
Failure of the primary barrier, the hydrostatic
pressure in the well and a failure of the secondary
barrier, the human detection of gas flowing into or expanding in the well and
activation of the rig’s blowout preventer.
The report explains that
unplanned underbalanced drilling and tripping operations allowed a large
quantity of gas to enter the well, and safety-critical operations
called “flow checks,” used to determine if gas is in the well, were not
The full report is too big to attach but can be downloaded from
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