March 23 (Reuters) - Seadrill Ltd says:
* Has been awarded an 18-month contract extension for the drillship West Tellus by Petrobras commencing in April 2018 and securing work for the unit through the end of October 2019.
* The total backlog for the contract extension is approximately $164 million.
* As part of the agreement to extend the West Tellus, Seadrill has agreed to a dayrate reduction on the current contract effective from Feb. 26, 2016, resulting in a $132 million reduction in backlog.
* Net effect of this agreement is a $32 million increase in backlog. Source text for Eikon: Further company coverage: (Reporting by Gwladys Fouche)