Nov 13 (Reuters) - Oil Search Ltd OSH.AX :
* On track to deliver 2017 production at upper end of guidance range
* 9 month production to Sept. 30, 2017 of 22.7 mmboe
* May elect by June 30, 2019 to acquire further 25.5% interest in Pikka unit, adjacent exploration acreage & 37.5% interest in horseshoe block for US$450m