Drilling With Dual-Fuel Technology
Installation of dynamic gas blending kit leads to fuel savings, eliminates operational downtime
Caterpillar Inc. has supplied Southwestern Energy Co. with two Cat 3512C dual-fuel generator sets with EPA-approved dynamic gas blending (DGB) kits on a drilling rig operating in the Fayetteville Shale Play.
Featuring a 60 hz, 1.0 eMW drilling rating, the Cat dual-fuel solutions powered the drilling of eight wells over the course of 45 days, saving Southwestern Energy more than an estimated US$100 000 in fuel costs, the company said.
Cat said some of the key factors in realizing these savings were 100% availability of gas and no increase in unexpected downtime.
The Cat DGB system is CARB-certified for use with fuels with a lower heating value (LHV) of between 905 BTU/scf to 1250 BTU/scf, giving operators a wide range of fuel options while meeting Tier 2 emissions levels, the company said.
Additionally, the Cat DGB system was recently approved by the EPA as a field fix that allows the installation of the DGB kit to convert the diesel engine to run on a combination of diesel/natural gas – the EPA approval applies to the DGB kits for land drilling and well stimulation applications.