30 C.F.R. § 250.413 What must my description of well drilling design criteria address?
Title 30 - Mineral Resources
Your description of well drilling design criteria must address: (a) Pore pressures; (b) Formation fracture gradients, adjusted for water depth; (c) Potential lost circulation zones; (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 estimated pore pressures, formation fracture gradients, proposed drilling fluid weights, 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. [68 FR 8423, Feb. 20, 2003]
Title 30: Mineral Resources
PART 250—OIL AND GAS AND SULPHUR OPERATIONS IN THE OUTER CONTINENTAL SHELF
Subpart D—Oil and Gas Drilling Operations
Applying for a Permit To Drill
§ 250.413 What must my description of well drilling design criteria address?
