Presentation May Explain Oil Rig Explosion and Fire
A publicly available
Halliburton PowerPoint presentation from last November might tell us a
lot about what could have caused the oil blowout, fire and massive oil
gushing at the Horizon rig.
Suppose you’re that division of Halliburton that has the dangerous job
of "cementing" the drilling hole and the gaps between the hole and pipe.
You’ve done this lots of times in shallow water wells, but you’ve
learned through previous experience in deep water there’s a particularly
difficult problem having to do with the presence of gas that has seeped to
the ocean floor and been captured in essentially "frozen" crystallized
The problem is that when you drill into these formations, and then try
to inject cement into the hole/gaps to prevent leakage, the curing process
for that creates heat. That heat can, if not controlled, cause the gas to
escape the frozen crystals. If a lot of gas is released all at once, as
could happen during the cement/curing process, it can cause a blowout
where the cementing is occurring, or force gas and/or oil up the pipeline
to the drilling rig on the surface. And the heat created by the process
may be just enough to ignite the gas, causing the explosion and fire.
Did this happen at the Horizon rig? And if Halliburton already knew
about this problem months (years) ago, and knew the risks it might create,
why are we just now learning about this?
• Shallow water flow may occur during or after cement job
• Under water blow out has happened
• Gas flow may occur after a cement job in deepwater environments that
contain major hydrate zones.
• Destabilization of hydrates after the cement job is confirmed by
• The gas flow could slow down in hours to days if the de-
stabilization is not severe.
• However, the consequences could be more severe in worse cases.
Page 13 lists the design objectives but then concedes they can’t all be
met at once:
Deepwater Well Objectives
• Cement slurry should be placed in the entire annulus with no losses
• Temperature increase during slurry hydration should not destabilize
• There should be no influx of shallow water or gas into the annulus
• The cement slurry should develop strength in the shortest time after
placement Conditions in deepwater wells are not
conducive to achieving all of these
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