Incident Report — I H Davis

Incident Report — I H Davis by the Oklahoma Corporation Commission, April 30, 2012
The mechanical failure in the 2-30 Davis well occurred at 1,765 feet, adjacent to a coupling. The uncemented, gas charged zone is approximately 800 feet above that point. The annulus outside the production string in the 2-30 Davis well from the failure point to the gas—charged zone was the most likely migration pathway for the gas. A result of the Chesapeake investigation into the 111 Davis well blowout was the identification of the offset company well, the 2-30 Davis, as the most likely source of the unexpected natural gas. This leak was initiated by a confirmed failure in the production casing. This event became apparent with increasing production problems in the 2-30 Davis well by the middle of 2011. This failure should have been reported to the 0CC and immediate action taken to repair the 2-30 Davis well as required by subsection (b) of Rule 165:10-3-3, but was not. There was no blowout preventer or other well control equipment in place on the 1H Davis well when drilling out of the surface casing and into the shallow gas charged zone at approximately 925 feet. This was not in compliance with subsection (i) of Rule 165:10-3-4. The gas charging of the shallow porosity zone may have been prevented or mitigated if 0CC Rule 165:10-3-3(b) had been complied with and similarly, the blowout may have been controlled if 0CC Rule 165:10-3-4(i) had also been followed. … The DCC will emphasize operator understanding of and compliance with the surface casing rules for new drills in this general area.

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