During the second quarter of 2011, CWC acquired 22 service rigs from TWS increasing CWC's market share in service rigs and increasing the fleet size at that time by 54%. In 2012, the Company completed the construction of a new slant service rig, two new double service rigs, one new single service rig, and recertified one single service rig not previously in service. Additional growth opportunities for new geographic areas were identified in 2012 which led to the construction of these additional service rigs that increased the active service rig count to 68 service rigs with three more new service rigs being constructed in 2013.
CWC's Class I, II and III coil tubing units have depth ratings from 1,500 to 4,000 metres and are well positioned for the changing demand of our customers for deeper depth capabilities. CWC converted one coil tubing unit to a Class III, 2 inch unit capable of depths of 4,000 meters and was deployed in the field in October 2011, a second unit was deployed to the field before the end of the first quarter of 2012 and a third unit, committed to in the 2012 capital budget, is scheduled to be available in Q3 2013.
Well Servicing division revenue in 2012 was up 15% at $102.8 million compared to $89.0 million in the 2011. The $13.8 million year over year increase was largely due to the increased fleet from the TWS acquisition and new equipment additions in service rigs and coil tubing. While utilization has decreased year over year this was partially offset by rate increases implemented in Q4 2011 in response to higher operating costs, particularly for labour and fuel. Average hourly rates on service rigs improved approximately 8% to $783 per hour in 2012 as compared to $727 per hour in 2011. Coil tubing average hourly rates improved 39% to $1,053 per hour in 2012 compared to $757 per hour in 2011 driven by our focus on higher margin work and contribution of our higher depth capacity coil tubing units which have a higher price per hour given the demand for these units. CWC continues to monitor its pricing in the competitive landscape and anticipate stable margins in 2013.
Total service rig hours in 2012 have increased 11% over 2011. The increase is primarily attributable to the acquisition of TWS and new equipment additions. Service rig hours decreased 6% for Q4 2012 compared to Q4 2011. The decrease is consistent with the drop in overall industry utilization for service rigs as noted earlier. Utilization of our well service equipment has risen from the lows experienced in 2009 driven by increased spending on exploration and development as a result of generally higher oil prices and an increase in the number of wells now producing oil compared to that of natural gas.
Other Oilfield Services
CWC's Other Oilfield Services division provides a variety of services for the completion and production phases of oil and natural gas wells from its 8 snubbing units and 11 well testing units. The Other Oilfield Services division revenue decreased by 53% to $9.5 million in 2012 from $20.5 million in 2011. During 2011, revenue of $7.0 million was generated from the nitrogen assets which were sold in December 2011. The remaining $4.0 million decrease was impacted by a decrease of $2.6 million from the snubbing units, which continue to be affected by low natural gas prices, and a decrease of $1.4 million from well testing as a result of lower completions activity in the industry, particularly in the second half of 2012.
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