Chief operating officer Doug Suttles told The Associated Press on Tuesday in Gulf Shores, Ala., that the flow should decrease "to a relative trickle" by Monday or Tuesday.

President Barack Obama plans to visit the region the same days.

Suttles says a second pumping ship should improve the process. And he says a new containment cap being built will seal better and reduce leakage.

He says BP believes the oil now washing up on the coast was spilled soon after a rig exploded about 50 days ago and sank.

Suttles says oil will probably continue to wash up for about the same period after the well fully shuts down.

A relief well expected to stop the flow is expected to be done in August.