When Exxon Mobil Corp. in January started pulling oil from beneath the icebound waters off Russia’s eastern coast, the project was over budget and a year behind schedule. The troubles likely would have remained out of public view had Exxon not sued contractor WorleyParsons Ltd. The spat offers a rare glimpse of the challenges and sniping behind one of the world’s most complicated oil developments as soaring costs and falling crude prices have bedeviled the energy industry. The project, known as Arkutun-Dagi, called for building one of the largest offshore drilling platforms in the world, designed to withstand extreme winds, waves and earthquakes that shake the seabed beneath the icy Sea of Okhotsk. Oil began flowing in January, and is expected to reach up to 90,000 barrels a day. […]