By Adam Wilmoth Energy Editor awilmoth@oklahoman.comSandRidge Energy Inc. on Wednesday said it is considering a merger plan proposed by Tulsa-based Midstates Petroleum Co. The Oklahoma City company issued a three-sentence statement confirming it has received the unsolicited proposal. "As previously disclosed, SandRidge's independent directors are engaged in an ongoing dialogue with shareholders and are developing a plan of action in line with their commitment to acting in the best interests of all shareholders," the company said.