Oilex Begins Fracture Stimulation Operations at Cambay-77H Well in Gujarat

Oilex Ltd revealed Tuesday that fracture stimulation operations have commenced at Cambay-77H well in the Cambay Production Sharing Contract (PSC) in Cambay Basin, Gujarat, India.

Since the previous update June 9:

  • Interpretation of the cement bond log confirmed excellent cementing of the 4.5 inch production casing verifying well integrity
  • The 10,000 psi fracture stimulation tree (frac tree) was installed and pressure tested
  • Water storage pit was filled with ~21,000 barrels of water
  • All Schlumberger equipment was mobilized, 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 ~ 30 barrels of fluid will acquire data related to reservoir properties. The Stage 1 “data frac” of ~ 500 barrels of fluid to assess local geo-mechanical rock properties will be followed by the Stage 1 “main frac” where ~4,100 barrels of frac fluid and ~136 tons 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. The Cambay-77H logs also compare favorably to the  Cambay-73 vertical well, which produced from the Y zone at ~1 million standard cubic feet per day, or MMscf/d (plus condensate and is located approximately 0.62 mile (1 kilometer) from Cambay-77H.

Cambay-77H is offset ~984 meters (~300 meters) from the Cambay-76H horizontal well that underwent a successful multiple staged fracture stimulation program along its 2,076 feet (633 meters) lateral section in 2012. However, this well was suspended before testing due to downhole mechanical problems.

Cambay-77H has a modified completion with cemented 4.5 inch production casing to minimize risk associated with post-frac milling operations. A shorter lateral section 1,148 feet (350 meters) in Cambay-77H coupled with a conventional “plug and perf” method is expected to facilitate the primary goal of the well – recording hydrocarbon flow information at surface during a production test.


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