ONGC fights mud loss at NEC-DWN-2002/2 well

Vol 18, PW 1 (28 Aug 14) Exploration & Production

ONGC has successfully dealt with a ‘mud loss’ scenario on August 19 at deepwater exploration well MDW-25 at NEC-DWN-2002/2 on the east coast.

ONGC drilled the well to 5150 metres when it began losing mud because of a loose formation, which contractor Baker Hughes sealed by carrying out a ‘cementing squeeze’ around the casing to reinforce the formation. By August 25, Platinum Explorer had restarted drilling and reached 5300 metres - still short of planned 7032 metres TD.

Elsewhere, Noble Duchess has resumed drilling appraisal well G-1-9#sub at the G1 field after rough weather forced a drilling suspension for several days. By August 19, Duchess had drilled 1364 of its 2267 metres planned TD targeting early Pliocene formations.

Actinia meanwhile, also on standby due to strong east coast water currents, began drilling well G-1-NE-AA at G1 on August 4 and by August 19 had drilled the well to 955 meters of its planned 3025 metres TD. Transocean semisubmersible GSF 140 had spent 36 days as of August 19 at relief well G-4-6 (A), also on the east coast, preparing to drill and awaiting good weather conditions.

Another rig, GSF Explorer, continues to drill appraisal well MDW#24 at ONGC’s 4061-sq km NELP-II gas discovery block MN-OSN-2000/2 and by August 19 had drilled the well to 2707 metres of the targeted 4882 metres TD.