Weatherford/lamb, Inc.

Iain Cameron Macaulay

Peter Ellington

An expandable tubular coupling () includes first and second thread portions () each comprising a plurality of inter-engaging teeth (), wherein at least one tooth on the first thread portion () engages a corresponding tooth on the second thread portion () and the remainder of said inter-engaging teeth () define respective gaps () therebetween.

Expandable coupling

An expandable tubular coupling comprises a threaded male portion and a corresponding threaded female portion, wherein the thread portions feature thread profiles configured such that the coupling may be made up to a predetermined extent, and once made up to the predetermined extent be made up no further. In a disclosed embodiment the thread profiles are a combination of a square thread profile and dovetail thread profile.

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Aberdeen, United Kingdom

Iain Cameron Macaulay