** Shares of Invictus Energy IVZ.AX rise as much as 6.1%
to A$0.175, their highest since Nov. 17
** Upstream oil and gas company says rig drilling contract
with Exalo Drilling S.A. at Cabora Bassa Project in Zimbabwe
extended for two years
** Says retention of rig under contract will bring
"substantial" time and cost savings
** Stock up 17.2% for the week so far, set for biggest
weekly gain since Oct. 27
** Stock has fallen 43.1% this year, as of last close
(Reporting by Sneha Kumar in Bengaluru)
((Sneha.Kumar@thomsonreuters.com;))