Ravva production hike expected after three workovers

Vol 11, PW 13 (01 Nov 07) Exploration & Production

Cairn India is hoping for a modest increase in oil production at the Ravva oil and gasfield offshore eastern India after it drills three workovers.

“Production from Ravva is expected to go up by 3000-4000 b/d after these workover wells are completed,â€‌ we hear. “Cairn has some internal estimates about how much production will increase but no one is talking about it.

â€‌ Average production at Ravva currently stands at 51,720 b/d, according to Cairn India’s quarterly results, announced on October 25. Last week, PETROWATCH learns Cairn moved jack-up Hercules 31 to the Delta platform to begin the first of the three workovers at well RD-3 from discovery well RX-8, where it will stay for another 20 days.

After that Hercules 31 is likely to move to two further locations identified by Cairn’s reservoir development team during an internal meeting on October 16. These well locations identified for workovers are: RE-1 and RA-2.

Once the workovers are completed, Cairn is planning an appraisal well at Ravva to establish the true extent of the RX-8 discovery. Spud in July this year, Cairn said in its quarterly results that three DSTs at RX-8 resulted in varying flow rates of between 1150 b/d and 1850 b/d.

Cairn is also believed to be considering another exploration well at Ravva, but this appears to hinge on the approval of consortium partners ONGC (40%), Marubeni (12.5%) and Petrocon (25%), formerly Videocon Petroleum. “No firm decision has been taken about the exploration well,â€‌ reports a source.

“Cairn will take a final decision in the next 15 days.â€‌ Much also hinges on the availability of jack-up rig Hercules 31.

Until now, it was assumed that Cairn would release Hercules 31 after completing the three workovers and one appraisal well. “Any decision to release the rig will depend on whether Cairn decides to drill one exploratory well,â€‌ we hear.

“If it decides to go ahead and drill the well, then there is no chance that Hercules 31 will be released.â€‌ Ravva currently produces 8% of India’s total domestic oil production.