30 C.F.R. § 250.428 What must I do in certain cementing and casing situations?
Title 30 - Mineral Resources
The table in this section describes actions that lessees must take when certain situations occur during casing and cementing activities. [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
Casing and Cementing Requirements
§ 250.428 What must I do in certain cementing and casing situations?
------------------------------------------------------------------------ If you encounter the following situation: Then you must . . .------------------------------------------------------------------------(a) Have unexpected formation Submit a revised casing program to the pressures or conditions that District Manager for approval. warrant revising your casing design.(b) Need to increase casing Submit those changes to the District setting depths more than 100 Manager for approval. feet true vertical depth (TVD) from the approved APD due to conditions encountered during drilling operations.(c) Have indication of (1) Pressure test the casing shoe; (2) inadequate cement job (such as Run a temperature survey; (3) Run a lost returns, cement cement bond log; or (4) Use a channeling, or failure of combination of these techniques. equipment).(d) Inadequate cement job....... Re-cement or take other remedial actions as approved by the District Manager.(e) Primary cement job that did Isolate those intervals from normal not isolate abnormal pressure pressures by squeeze cementing before intervals. you complete; suspend operations; or abandon the well, whichever occurs first.(f) Decide to produce a well Have at least two cemented casing that was not originally strings (does not include liners) in contemplated for production. the well. Note: All producing wells must have at least two cemented casing strings.(g) Want to drill a well without Submit geologic data and information setting conductor casing. to the District Manager that demonstrates the absence of shallow hydrocarbons or hazards. This information must include logging and drilling fluid-monitoring from wells previously drilled within 500 feet of the proposed well path down to the next casing point.(h) Need to use less than Submit information to the District required cement for the surface Manager that demonstrates the use of casing during floating drilling less cement is necessary. operations to provide protection from burst and collapse pressures.(i) Cement across a permafrost Use cement that sets before it freezes zone. and has a low heat of hydration.(j) Leave the annulus opposite a Fill the annulus with a liquid that permafrost zone uncemented. has a freezing point below the minimum permafrost temperature and minimizes opposite a corrosion.------------------------------------------------------------------------
