*
Imperial Oil said it shut some units andassociatedoperations on Wednesday for planned work at its 187,000 barrelsper day refinery in Strathcona, Alberta.
* The maintenance is expected to continue for several weeks,thecompany said on Thursday, adding it expected to meet allcontractual commitments.
(Reporting by Apeksha Nair and Nithin Prasad in Bengaluru)