Our Canadian operations generated quarterly revenue of $244.2 million and operating income of $51.0 million during the fourth quarter of 2012. Canadian revenue decreased by 41% and operating income decreased by 69% compared to the fourth quarter of 2011. Sequentially, Canadian revenue decreased by 24% and operating income decreased by 49%. The decreases were indicative of lower year-over-year activity levels in Canada due to reduced customer spending as 2012 capital programs came to a close. Pricing decreased by 13% compared to the fourth quarter of 2011 and by 7% sequentially, which also had a negative impact on Canadian revenue and operating margins. We believe that fourth quarter pricing levels reflect a balanced Canadian pressure pumping market and expect the market to remain balanced throughout 2013. In addition, we expect activity levels to rebound in the first quarter of 2013 as we enter the 2013 winter drilling season in Canada.
Fourth quarter U.S. revenue was $173.6 million and the operating loss was $2.1 million. U.S. operating margins improved sequentially by 1,050 basis points as we began to see the benefits of reduced guar costs and cost cutting initiatives. Trican pricing remained relatively stable on a sequential basis for both contracted and spot market crews. Despite the improved margins and stable pricing, U.S. activity levels weakened during the fourth quarter of 2012. U.S. rig count decreased in our areas of operations by 13% compared to the fourth quarter of 2011 and by 5% compared to the third quarter of 2012. The drop in U.S. demand was largely due to reduced activity over the U.S. Thanksgiving and Christmas holiday periods.
Revenue from our international operations was $68.0 million in the fourth quarter of 2012, up 11% year-over-year but down 6% sequentially. Russia comprises the majority of our international results and Russian activity levels were up year over year as several customers increased their work scope to meet 2012 capital spending budgets. Russian fracturing activity was particularly strong due to an increase in work performed on horizontal wells. Approximately 12% of our 2012 fourth quarter Russian fracturing revenue was from work performed on horizontal wells, compared to approximately 3% in the fourth quarter of 2011. Russian activity levels were down sequentially due to cold temperatures typically experienced near the end of the fourth quarter.
Trican has taken a significant step into the global horizontal multi-stage completion market with the acquisition of i-TEC Well Solutions, which closed in January of 2013. i-TEC is a privately-owned company based in Norway that has developed a field-proven portfolio of completion systems and intervention tools. This acquisition complements Trican's existing completion systems and tools business, and is expected to provide positive growth opportunities, as well as enhance our other pressure pumping service lines.
Trican is pleased to announce a joint business agreement with Geotomo LLC to offer customers an integrated service that will combine hydraulic fracturing engineering with microseismic software capabilities. The joint business agreement will leverage Geotomo's advanced geophysical software capabilities and Trican's depth of experience in geological and pressure pumping services to offer customized solutions to our customers. This service will help our customers optimize fracture performance and improve the production of the well.
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