Guardian: BP has bought into the Brazilian oil rush with a $7bn (£4.65bn) deal that will boost the group’s potential reserves by about 2bn barrels of oil. The deal, with Devon Energy of the US, will also create a joint venture to develop BP’s controversial oil sands in Canada. A number of recent huge finds in water up to two miles deep and below a thick layer of salt on the seabed off the coast of Brazil has made the country the focus for international oil companies looking for new …