The oil industry's merger wave continues.A consolidation wave continues to wash over the oil patch. ExxonMobil kicked off the current boom in mergers and acquisitions last year with its recently closed $60 billion deal for Pioneer Natural Resources. Rival Chevron followed with its acquisition of Hess, which it hopes to close in the coming months. The sector has seen several smaller transactions as oil companies pair up to enhance their positions and reduce costs. The latest industry tie-up will see ConocoPh ...