Crude-oil-focused drilling and completion in the Permian Basin is generating fast-increasing volumes of associated gas — and creating opportunities for midstream companies that provide “wellhead-to-water” services for natural gas and NGLs. ONEOK has become a much bigger player in this space via several transformational acquisitions and MPLX has been making moves of its own. (The companies also are working together on a new LPG export terminal — and more.) In today’s RBN blog, we continue our review of Permian-to-Gulf midstreamers’ expansion plans with a look at what ONEOK and MPLX are up to.