Crestwood Midstream Partners, a pipeline and processing plant company with operations in the Marcellus Shale, announced yesterday they are increasing their Marcellus commitment by buying out the remaining portion of a joint venture for $258 million. Most of Crestwood’s Marcellus operations are located in the liquids-rich portion of the play in northern WV. This latest move comes after Antero Resources sold their gathering system in Harrison and Doddridge counties, WV to Crestwood for $375 million in February 2012 (see Antero Sells WV Midstream Operation to Crestwood for $375M).