LONDON (AP) — BP PLC says it has agreed to sell its stake in a Norwegian oil field to AS Norske Shell for $240 million as part of its efforts to raise funds to pay for the cost of the Gulf of Mexico oil spill.

The deal, which involves BP selling its 18 percent holding in the field, raises Norske Shell's stake in the field to 44.56 percent.

BP said Thursday that it has now sold or agreed to sell more than $33 billion in assets since 2010 towards its goal of raising $38 billion to pay the cost of the Gulf of Mexico oil spill.

On Monday, BP announced it had sold some of its deep water production assets in the Gulf of Mexico to Plains Exploration & Production Co. for $5.55 billion.