Royal Dutch Shell has agreed to sell drilling rights in shale formations in Louisiana and Wyoming for $2.1 billion in two transactions.
1,588 rigs were exploring for oil and 316 for gas. Four were listed as miscellaneous. A year ago there were 1,778 active rigs.
A south Louisiana flood board has launched a legal fight against a new state law aimed at retroactively killing a lawsuit filed last year over coastal damage attributed to oil and gas drilling.
The Government Accountability Office says environmental regulators are failing to adequately enforce rules for wells used to dispose of toxic waste from drilling.
BP PLC has asked the U.S. Supreme Court to throw out part of its settlement of claims for damage from its enormous oil spill in 2010 — a section saying businesses don't have to prove that the spill directly harmed them to be eligible for payment, only that they lost money afterward and recovered in 2011.