Bruce Witwer, Dril-Quip Inc.

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Presentation transcript:

Bruce Witwer, Dril-Quip Inc. API Consideration for Worst Cast Discharge Bruce Witwer, Dril-Quip Inc.

Definitions

RATED ≠ EXTREME ≠ SURVIVAL Definitions Survival Loads Watch circles Storm events Repeatable (probabilistic) Worst Case Loads/Discharge (WCD) Drive-off Blowout/uncontrolled flow One time event (stochastic) Allowable stress scenarios (ref. API 17G/2RD) Rated = .67 (σY) Extreme = .80 (σY) Survival = 1.00 (σY) RATED ≠ EXTREME ≠ SURVIVAL Where does WCD fit?

WCD - Example #1 Blowout/uncontrolled flow Casing hanger & seal Pressure control (rated) Lockdown load (beyond rated) Current industry standards API 17D/6A (group 4) Cyclic loads (rated) Cyclic thermal

WCD - Example #2 Blowout/uncontrolled flow Liner hanger & packer Pressure control or containment Lockdown load Current industry standards API 11D1 API 19 LH (pending) Cyclic thermal Inconsistent terms, failure modes

WCD - Example #3 Drive-off event Wellhead System Proposal Pressure containment (rated) Structural capacity (beyond rated) Current industry standards N/A Proposal Survival (ALS) event API 17G & API 2RD 1.00 (σY)