GSPC narrowly avoids â€کblowout' at KG#28 well

Vol 11, PW 4 (28 Jun 07) Exploration & Production

GSPC has begun sidetracking well KG#28 at its discovery block KG-OSN-2001/3 offshore Andhra Pradesh.

PETROWATCH understands from industry sources that the sidetracking operation began around 17th June. Saipem rig Perro Negro 3 spud KG#28, an appraisal well, for GSPC on 6th February 2007.

But when the bit reached 5300 metres, it encountered a â€کgas cut’, narrowly avoiding a potential blowout. Nine days later on 30th May GSPC controlled the situation and continued drilling but fresh problems arose when the drill string became stuck.

Says a source: “This happened because the mud used to control the blow-out remained inside for too long.â€‌ GSPC then thought about a â€کfishing operation’ to retrieve the stuck drill string but decided against it.

“A fishing operation would have taken a lot of time and the chances of success were uncertain,â€‌ we hear. This was a crucial factor given the high cost of the well.

GSPC eventually decided to sidetrack the well. “Only about 500 or 600 metres remain to TD,â€‌ we hear.

GSPC has mixed feelings about its narrow escape at KG#28. “The well was full of gas,â€‌ says a source referring to the risk of a blowout.

“In normal circumstances it would have taken at least two months to control but GSPC managed it in three weeks.â€‌ On two other locations, meanwhile, work continues smoothly.

At exploration well KG#16, jack-up Atwood Beacon began testing last week after reaching TD of 5372 metres in early May. “Testing is expected to last about a month,â€‌ says a source.

“About four or five zones will be tested between 5000 metres upwards to 4300 metres.â€‌ At well KG#30, spud by Deep Driller-1 on 8th May in 45 metres water depth, GSPC crossed 1800 metres last week.