Dec 13 (Reuters) - The discount on Western Canada Select

(WCS) heavy crude versus the North American benchmark West Texas

Intermediate (WTI) tightened on Friday:

* WCS for January delivery in Hardisty, Alberta, settled at

$12.20 a barrel under the WTI benchmark, according to brokerage

CalRock, having settled at $12.55 a barrel under the U.S.

benchmark on Thursday.

* Global oil prices climbed to settle at a three-week high,

on expectations that additional sanctions on Russia and Iran

could tighten supplies and that lower interest rates in Europe

and the U.S. could boost fuel demand.

(Reporting by Nia Williams in British Columbia)