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Oilex begins fracture stimulation at India offshore play

25th June 2014

Oilex have announced that mobilisation and preparatory operations have been successfully completed and immediate surface pressure increase was observed after first perforation at Cambay-77H Well in the Cambay Basin, Gujarat, India

Oilex begins fracture stimulation at India offshore play
All Schlumberger equipment was mobilised, set up and tested at site, necessitating some field repairs

Oilex has announced that fracture stimulation operations have commenced.

Since the previous update on 09 June 2014:

  • Interpretation of the cement bond log confirmed excellent cementing of the 4.5 inch production casing verifying well integrity
  • The 10,000psi fracture stimulation tree (frac tree) was installed and pressure tested
  • Water storage pit was filled with around 21,000 barrels (bbl) of water
  • All Schlumberger equipment was mobilised, set up and tested at site, necessitating some field repairs
  • All initial Coiled Tubing operations were completed including:
  • 4.5 inch production casing cleaned and gauged
  • Correlation of the location for each perforation cluster
  • Stage 1 ‘toe prep’ including perforations

During the Stage 1 ‘toe prep’, a pressure increase of approximately 800 psi was detected at surface immediately after the initial Stage 1 perforation, confirming successful access to the reservoir.  A steady rise in pressure was observed and, as a precaution, flow-back equipment was rigged up to the frac tree while coil tubing operations continued.

The ‘micro frac’ of around 30 bbls of fluid will acquire data related to reservoir properties. The Stage 1 ‘data frac’ of around 500 bbls of fluid to assess local geo-mechanical rock properties will be followed by the Stage 1 ‘main frac’ where around 4,100 bbls of frac fluid and 136 tonnes of proppant will be pumped into the formation.

As previously reported, Cambay-77H intersected the primary reservoir target (Y Zone) on prognosis.  A comprehensive suite of logs has been acquired and interpretation confirms the wellbore encountered a significant sequence of hydrocarbon-bearing reservoir similar to Cambay-76H.  

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