30 C.F.R. § 250.413

What must my description of well drilling design criteria address?

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Your description of well drilling design criteria must address:

(a) Pore pressures;

(b) Formation fracture gradients, adjusted for water depth;

(d) Drilling fluid weights;

(e) Casing setting depths;

(f) Maximum anticipated surface pressures. For this section, maximum anticipated surface pressures are the pressures that you reasonably expect to be exerted upon a casing string and its related wellhead equipment. In calculating maximum anticipated surface pressures, you must consider: drilling, completion, and producing conditions; drilling fluid densities to be used below various casing strings; fracture gradients of the exposed formations; casing setting depths; total well depth; formation fluid types; safety margins; and other pertinent conditions. You must include the calculations used to determine the pressures for the drilling and the completion phases, including the anticipated surface pressure used for designing the production string;

(g) A single plot containing curves for estimated pore pressures, formation fracture gradients, proposed drilling fluid weights (surface and downhole), planned safe drilling margin, and casing setting depths in true vertical measurements;

(h) A summary report of the shallow hazards site survey that describes the geological and manmade conditions if not previously submitted; and

(i) Permafrost zones, if applicable.

[76 FR 64462, Oct. 18, 2011, as amended at 81 FR 26017, Apr. 29, 2016; 84 FR 21973, May 15, 2019]

Notes of Decisions

Cited in 2 cases, 2008–2008 · leading case: Alaska Wilderness League v. Kempthorne, 548 F.3d 815 (9th Cir. 2008).

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Alaska Wilderness League v. Kempthorne, 548 F.3d 815 (9th Cir. 2008). · cites it 2× “Thus, the agency's decision not to require this information now, but instead to require it later when the information is available, was not arbitrary and capricious.”

Alaska Wilderness v. Kempthorne (9th Cir. 2008). “Any drilling beyond the spe- cific sites approved in Shell’s exploration plan would have to undergo separate MMS review pursuant to 30 C.F.R. § 250.413 (h), which requires the applicant for a permit to drill to submit a report of conditions as the proposed site.”

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