1. DUAL FUEL FOR DRILLING - APACHE’S EXPERIENCE WORK DONE BY: SAM GOSWICK PRESENTED BY: GEORGE KING 05/15/2014

2. Alternate Fuels and Efficiency Programs: D-F Hythane Pressure reducer, from ~50psi on line to ~5psi into engine. To gas manifold line programmable controller, monitors temp/vibration/gen load, adjusts sub rate E-stop, optional wired into Methane/fire detectors From kit into intake manifold of diesel engine CNG manifold in motor house One kit per generator set

3. Alternate Fuels and Efficiency Programs: LNG kits Ambient vaporizer (LNG boils at -260 degrees) LNG 2TK tri-hull transport trailer Pressure and choke lines Buried electrical and gas lines to rig

4. Alternate Fuels and Efficiency Programs: Dedicated NG Catalytic Converter for methane escape Artificial load bank CAT G3516 generator set Use with field gas/LNG/CNG (currently on LNG)

5. Alternate Fuels and Efficiency Programs: CNG kit Rig unloader Rig CNG supply trailer Virtual pipeline refueling trailer

6. Alternate Fuels and Efficiency Programs: Frac LNG Electric Vaporizor “Queen” unit LNG Vaporizer/Transporation trailer Caterpillar Dynamic Gas Blend (DGB) dual-fuel kits on 12 Q-10, 2000HP Pump trucks

7. Alternate Fuels and Efficiency Programs: Frac CNG CNG Virtual pipeline trailer Frac CNG unloader Wheeler high-rate CNG station (~4miles north of Wheeler, TX)

8. CONCLUSION  Adopting natural gas is manageable - requires learning  Dual fuel is flexible, but dedicated natural gas engines yield higher savings  Field gas is preferred where available, but consistency and supply stability trump gas cost savings.  For dedicated natural gas engines, turbines have tested well, but spark ignited engines are plug & play. Load banks will be required in many cases.  Strong conversion economics are needed to justify transition challenges 8

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