DUAL FUEL FOR DRILLING - APACHE’S

EXPERIENCE

WORK DONE BY:

SAM GOSWICK

PRESENTED BY:

GEORGE KING05/15/2014

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

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

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)

Alternate Fuels and Efficiency Programs: CNG kit

• Rig unloader• Rig CNG supply trailer• Virtual pipeline refueling trailer

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

Alternate Fuels and Efficiency Programs: Frac CNG• CNG Virtual pipeline trailer• Frac CNG unloader• Wheeler high-rate CNG station (~4miles north

of Wheeler, TX)

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

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