Road collapse delays ONGC drilling in Tripura

Vol 20, PW 12 (09 Mar 17) Exploration & Production

ONGC has abruptly moved a drilling location at its Tripura asset after the road collapsed under its 1000-hp DR-15 rig supplied by Deep Industries.

ONGC was transporting the rig to drill well ROBG at the Rokhia field on February 27 when the trailer carrying the rig got stuck on the road, after which the road collapsed, according to an ONGC source. But within days of the mishap taking place, ONGC has gone ahead and selected a new location from which ONGC will tap a same reservoir by opting for horizontal drilling.

"Finally we were successful in moving the rig to the new location, which is also named ROBG," our ONGC source tells us. "It will take around 25 to 30 days to complete 'rig-up' operations and spud the well." ONGC plans to drill exploration well ROBG to 2863 metres TD over two months and to land casing in three phases: Phase-I till 600 metres will be 13 ⅜-inches, Phase-II till 2050 metres will be 9 ⅝-inches, and Phase-III till 2863 metres will be 5 ½-inches.

ONGC's rig ARMCUE-UE is also drilling well ROAY at Rokhia to 3241 metres TD. ROAY was spud on February 3, 2017 and reached 1324 metres TD by February 28.

Casing will be landed in four phases: Phase-I till 200 metres will be 20-inches, Phase-II till 1400 metres - 13 ⅜-inches, Phase-III till 2400 metres - 9 ⅝-inches and Phase-IV till 3241 metres will be 5 ½-inches.