How is one to bridge the gap between BP’s latest oil collection stats and visual reality?
The oil and gas giant claims to be sucking crude straight off its stricken mile-deep wellhead and pouring it into the drillship Enterprise at a rate of 11,000 barrels per day, thanks to a cap and tube installed on Friday. And, yet, video feeds from ROVs present a plume of oil and gas that looks as angry as ever, gushing plenty more black goop destined for dispersal into the Gulf of Mexico’s already beleaguered ecosystems.
“Clearly alot of people are looking at it and trying to understand what does this mean,” acknowledged BP senior vp/exploration Kent Wells of the top-rated video images during in a media briefing this afternoon.
Wells couldn’t say how much oil is escaping but he took pains to remind viewers that the leak is now pouring around their 4-foot-wide steel LMRP cap, making the plume appear wider. “It’s easy to forget that there’s a big vessel inside that,” says Wells. And it’s certainly true that his engineers might be capturing the bulk of the flow, according to federal flow estimates released last month. The two independent federal models of the flow both said the flow could as low as 12,000 barrels per day (bpd).
Unfortunately the federal models also provided plenty of headroom, saying the flow could be as high as 19,000 bpd in one case, and 25,000 bpd in the other. And the modelers predicted the flow might accelerate as much as 20% when BP cut away the riser from the sunken Deepwater Horizon platform, as required to install the cap. In other words BP’s cap could be capturing barely one-third of the flow.
A better cap is to be installed by the end of June, according to Wells. Whereas the existing cap simply pushes a rubber grommet on to a flange on the BOP, he says three new designs in the works could reach around and hook onto the flange for a tighter grip.
Nevertheless, optimization of the oil containment effort could give way to new disasters later this summer with the arrival of hurricanes, which usually begin menacing the Louisiana coast in August. If a storm blows across the leak site BP will have to disconnect and move the drill ships collecting oil, keeping the ships and their crews safe but throwing the Gulf ecosystem back to the dogs.
Wells says the new cap to be installed later this month will be part of a system designed for quicker disconnects and reconnects during storms, minimizing the time without containment. But he’s not prepared to say that the cap could actually seal off the flow until the storm had passed. “I wouldn’t want to say yet that we’d have the ability to close it off when we disconnect,” says Wells. “We’re just not there yet.”
This post was created for the Technology Review Potential Energy blog