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Cat Dual-Fuel Power Solutions

Modules with dynamic gas blending adjust to fuel quality, pressure; no recalibration required

Posted on June 10, 2014

Caterpillar Oil & Gas has been selected to supply its Cat 3512C land electric-drive drilling modules with dynamic gas blending (DGB) to power Citadel Drilling Ltd.’s (Citadel) new fleet of AC Triple drilling rigs.

The order will comprise 12 to 14 rigs over the course of the next five to six years. Three Cat 3512C modules, each with rated power of 1045 eKW at 1200 r/min, will be used to power each land drilling rig. The first three Cat DGB units have been delivered and tested and are slated to be field operational by the end of June 2014 on Citadel’s first rig, the company said.

Cat said its DGB kit automatically adjusts to changes in incoming fuel quality and pressure, allowing engines to run on a wide variety of fuels, from associated gas to vaporized LNG with no loss of performance integrity. It maintains diesel performance levels with up to 70% replacement of diesel with gas, accepts up to 55% inerts, and can be applied to existing engines with EPA certification, the company said. No customer input or gas analysis is needed during operation, and no recalibration is required when the equipment is moved or the gas supply changes.

The Cat DGB kit received off-road aftermarket parts certification from the California Air Resources Board (CARB) as well as EPA approval under the Field Fix provision. The Cat DGB system is 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, Cat said.