Reliance's massive Cambay drilling programme

Vol 16, PW 5 (20 Sep 12) Exploration & Production

Reliance is planning a 100-well drilling programme beginning end-December at its onland discovery block CB-ONN-2003/1 in Gujarat.

Eighty of the 100 wells to be drilled over five (5) years will be a combination of exploration, appraisal, and development wells, while the remaining 20 will be water injection wells, according to a note submitted to Gujarat state authorities. Reliance says at least four rigs will be hired for the 100-well drilling campaign, which it estimates will cost Rs1100cr ($200m).

Two will be 1500-hp rigs; another two will be 2000-hp. Reliance has drilled 18 exploration wells since 2006 at this 476-sq km NELP-V block, located 130-km south of Ahmedabad, each to TD between 2400-metres and 4800 metres.

Of the eight discoveries announced between 2009 and 2010, three flowed more than 300 b/d: Dhirubhai-47, Dhirubhai-49 and Dhirubhai-50. Hydrocarbon bearing zones were identified in all eight discoveries between 1200 to 1600m in the Miocene Basal Sand (MBS) of the Babaguru formation.

Reliance confidently predicts production of 20,000 b/d crude and more than 1m cm/d gas from CB-ONN-2003/1. Reliance also wants to set up oil and gas processing and storage facilities, as well as lay 80-km infield pipelines connecting the wells and installations.

In addition to four planned group gathering stations, four oil storage tanks are planned, each with 12,500 cubic metre capacity at a central tank farm. An additional four storage tanks with 5000-cubic metre capacity each are planned at a central tank farm, as is one 1000-cubic metre storage tank at the Early Production System (EPS).