Modular thread connection with high fatigue resistance

Details Modular thread connection with high fatigue resistance Modular thread connection with high fatigue resistance

2006-12-19

2006-12-19

Bochna, David (Department: 3679)

Pipe joints or couplings

Particular interface

Tapered

Reexamination Certificate

active

07150479

ABSTRACT:
A connector for oilfield applications has high resistance against cyclical bending stress and fatigue failure. In a preferred embodiment, the threaded connector has a pin-box arrangement for joining two components. The pin and box have threads with a pre-determined profile different from that specified by conventional (e.g., API) specification and provide improved strength characteristics. Certain embodiments of the present invention include a pitch-to-root radius ratio that is less than that specified by the API, a thread height-to-root radius ratio that is less than that specified by the API, a flank angle that is less than that specified by the API, and a taper that is less than that specified by the API for said pre-determined outside diameter. Certain other embodiments have less than all of these ratios and dimensions. Optionally, the connector has (a) wiring for transmitting power and/or data through the connector; and (b) at least one seal disposed adjacent the wiring for protecting the wiring from contact with wellbore fluids.

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“Specification for Rotary Drilling Equipment,” American Petroleum Institute (Aug. 1990).

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