Limestone hurdle for Oil India well at KG block

Vol 19, PW 12 (25 Feb 16) Exploration & Production

Oil India has encountered unexpected difficulties drilling the first of three High Pressure/High Temperature (HP/HT) wells at KG onland block KG-ONN-2004/1.

"Originally we thought we could drill this well in three months," reports an Oil India source. "But after almost two months we have drilled only one third of the target depth.

" Oil India spud well TLK-1 on January 12 using a heavy-duty 3000-hp rig from US-based Nabors Drilling expecting to reach 5200 metres TD by mid-April. "Hard rock limestone was encountered at 975 metres and this has slowed drilling," adds Oil India.

"Limestone was expected deeper at 1500 metres." Another delay is blamed on the breakdown of a Halliburton-supplied mud motor, one of two used at TLK-1, which resulted in three 'fishing' operations.

A second mud motor is supplied by Weatherford. By February 23 the Nabors rig had drilled to 1719 metres - still short of the target Golapalli formation expected between 4600 and 5200 metres.

In the coming months another two rigs are expected at this block. In January Oil India issued a LoA to Essar for a 2000-hp rig for mobilisation to site by April to drill three appraisal wells at locations 12, 13 and 14.

In May Oil India says it hopes to issue another LoA to Quippo for a rig to drill two development wells at locations 20 and O near gas discovery well Dangeru-1.