Expandable locking thread joint
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United States of America Patent
Stats
-
Sep 16, 2003
Grant Date -
Jun 12, 2003
app pub date -
Dec 6, 2001
filing date -
Dec 6, 2001
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A thread for expandable downhole tubular connections is disclosed. It features a locking pattern on the pin and box, which engages upon expansion of the connection. The locking pattern compensates for longitudinal shrinkage away from a torque shoulder, as a result of expansion. A resilient seal can be incorporated into the design with pin to box clearance disappearing around the seal as a result of expansion. Resilient seals can be used in tandem to trap atmospheric pressure between them. The wellbore hydrostatic pressure helps engage the locking feature by pushing the box into the pin, helped by the trapped low pressure between the seals.
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