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Unformatted text preview: took the initial GeoTap pressure in was measured at 14.15 ppg. The absolute minimum surface mud weight we could use to cover the pore‐pressure in this sand was 14.0 ppg. This would give us approximately a 14.2 ppg ESD over the aforementioned sand. If we were to drill ahead with a 14.0 surface mud weight/14.2 ESD, our equivalent circulating density (ECD) would be approximately 14.4‐14.5 ppg. We had already experienced static losses with a 14.5 ppg ESD! It appeared as if we had minimal, if any, drilling margin . . . Drilling ahead any further would unnecessarily jeopardize the wellbore. Having a 14.15 ppg exposed sand, and taking losses in a 12.6 BP‐HZN‐MBI00126338. 66 30 ppg reservoir in the same hole‐section had forced our hand. We had simply run out of drilling margin. C. Casing Program Casing programs describe the number and sizes of the casing strings to be set in the wellbore and are based upon pore pressure and fracture gradient plots. Casing programs are designed based on a number of factors, including burst and collapse pressures, 67 tensile stren...
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This note was uploaded on 01/18/2014 for the course BEPP 305 taught by Professor Nini during the Fall '11 term at UPenn.

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