Seneca Resources Co. LLC and NexTier Oilfield Solutions Inc. have begun a comparative carbon emissions assessment for various natural gas- and diesel-fired hydraulic fracturing (frack) equipment. 

Houston-based Seneca, the exploration and production (E&P) arm of National Fuel Gas Co., produces natural gas and oil in California, the Marcellus and Utica shales. 

The E&P would lead emissions testing on various diesel and dynamic gas blending engines, natural gas-fired turbine engines, and electric frack equipment with gas-fueled reciprocating engines. Independent third-party reviewers are to carry out the tests on each of the technologies. NexTier would perform equipment and completion solutions. 

Results of the study are expected to inform and craft “equipment solutions that...