Oil and gas services company Wood Group warned that weakening demand from operations in Canada and project delays will weigh on full year earnings growth, continuing into 2014."Our business in Western Canada, which represents just over 5% of divisional revenue, has weakened further and we do not expect it to recover during 2014," it said in a statement.The FTSE 100 energy giant said profit from continuing operations before tax and exceptional items rose 16.6% in the half year to $186.6m. Revenue from continuing operations firmed 3.0% to $3.4bn. Adjusted diluted earnings per share rose 19.0% to 44.5 cents.The group said after a strong first half performance it expects EBITA growth of around 10-15% for the full year.It added that its Mafumeira Sul and Ichthys projects are progressing well and completion is expected by the year end. Onshore pipelines have benefited from US shale market with strong activity across principal sub-sea hubs.Chief Executive Officer Bob Keiller commented: "We have achieved good growth in the first half and remain confident of achieving full year performance in line with expectations. Activity levels generally remain healthy and we believe the group is well positioned for future growth."Underling its confidence in future trading, the interim dividend has been increased to 7.1 cents, up 24.6%.CJ