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Unformatted text preview: r Horizon while on location at Macondo were a cause of the blowout. Testimony of Robert Neal, Joint Investigation Hearing, May 11, 2010, at 350‐351; Testimony of Eric Neal, Joint Investigation Hearing, May 11, 2010 at 326. 407 Eric Neal testimony at 326‐329; 334‐336. 408 Eric Neal testimony at 316.
409 Id. at 325, 336. 406 164 H. Safe Drilling Margin MMS regulations required that “[w]hile drilling, you must maintain the safe drilling margin identified in the approved APD [Application for Permit to Drill]. When you cannot maintain this safe margin, you must suspend drilling operations and remedy the situation.” 410 The safe drilling margin referenced in the regulation is the difference between the fracture gradient and the mud weight. The regulation did not define “safe drilling margin,” but typically, the industry‐accepted safe drilling margin was 0.5 ppg. This drilling margin was considered sufficient to allow the rig crew to circulate out a kick during the drilling process. I.
Well Control 30 CFR § 250.401 requires an operator to take...
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