NEW ORLEANS (AP) -- BP expected to attach a tight, new cap Monday on its busted oil well in the Gulf of Mexico, putting the oil giant a few tantalizing steps closer to knowing whether the fix will be enough to finally stop crude from gushing into the Gulf.
The new cap, a 150,000-pound metal stack known as "Top Hat 10," was about 300 feet from the point where it's supposed to connect with the leaking well, BP Chief Operating Officer Doug Suttles said in a Monday morning news briefing.
The BP executive was careful to keep expectations grounded, stressing that once the cap is in place, it will take days to know whether it can withstand the pressure of the erupting oil and feed it through pipes to surface ships. The cap and vessels together make up BP's plan to stop oil from spewing into the Gulf for the first time since April 20.
"Until we have the cap on, securely fitted in place, and know it's operating per the design, we have to recognize this is a complex operation," Suttles said.
Once the cap is firmly in place, the company will begin "shutting in" the well by closing perforated pipe at the top. The company will be looking to see if the pressure rises inside the cap. If it does, that means there are no other leaks, and the cap is stopping oil from leaking into the Gulf.
But lower pressure readings may indicate leaking elsewhere in the well. In that case, Suttles said, the company will work to collect the leak with surface vessels and by dropping yet another cap on top of the stack.
The testing should last about 48 hours, Suttles said.
Even if the tests show the cap is successfully holding in the oil, it will not be the final fix for the blown well. That will have to wait until one of two relief wells reaches the leaking well from underground and can inject heavy drilling mud and cement to form a permanent plug.
BP expects one relief well will do the job, but it's drilling a second as a backup. Officials have offered varying estimates for when that work will be done, but mid-August is the most common timeframe.
Work on the new cap has been moving briskly, with the old, leaky cap coming off the well on Saturday. One snag in the operation has been a delay in the startup of a vessel called the Helix Producer, which is supposed to connect to the well by a link below the cap, ultimately collecting roughly 1 million gallons of oil a day.
The ship was supposed to begin collection Sunday, but two minor technical glitches prevented that, Suttles said. He expects the ship to begin Monday, reaching full capacity within two days or so.
Weber reported from Houston.