Oilfield threaded connections
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United States of America Patent
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Mar 21, 2017
Grant Date -
Dec 4, 2008
app pub date -
May 29, 2007
filing date -
May 29, 2007
priority date (Note) -
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Abstract
A threaded oilfield tubular connection includes a box connector (12) having internal threads (16, 18) and a pin connector (14) having external threads (22, 24) for mating with the internal threads. Each of a box torque shoulder (20) and a pin torque shoulder (26) may be negative angle shoulders, and the thread flanks on the internal and external threads may also be negative angle load flanks. The connector substantially maintains a desired preload when dope is trapped between the threads during makeup. Another embodiment provides positive angle torque shoulders and positive angle load flanks.
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