Hybrid threaded connection for expandable tubulars

An expandable threaded tubular connection comprising:

• a first tubular segment with a box member, the box member comprising interengageable threads that have load flanks and stab flanks of a constant pitch;
• a second tubular segment with a pin member, the pin member comprising interengageable threads for engaging said box member, the interengageable threads of the pin member having a first thread segment and a second thread segment, the first and second thread segments comprising multiple turns of threads,
• wherein the threads of the first thread segment of the pin member fully engage corresponding mating threads on the box member upon make-up of the threaded connection,
• wherein the threads of the second thread segment are formed such that material is removed from the stab flank of the pin threads of the second thread segment to reduce the axial thickness of the threads relative to the axial thickness of the threads of the first segment,
• wherein the load flanks of the threads of the second thread segments is in full engagement with the mating flanks of the threads of the box member upon makeup of the connection,
• wherein the threads of the first thread segment comprises load flanks and stab flanks of a first constant pitch and the second thread segment comprises load flanks and stab flanks of a second constant pitch, the first constant pitch being equal to the pitch of the load flanks and stab flanks of the threads of the box member, and
• wherein the reduced axial thickness of the threads of the second thread segment of the pin member causes a gap to be formed between the stab flank of the pin threads and the adjacent flank of the box threads when the threads of the second thread segment are engaged with the corresponding mating threads of the box member upon make-up of the threaded connection;
• a machined land area in the outside diameter of the second tubular in the area adjacent an external shoulder of the pin member;
• a sleeve secured around the second tubular on the machined land area.

An expandable threaded tubular connection comprising:

• a first tubular segment with a pin member, the pin member comprising interengageable threads, the interengageable threads having a first thread segment and a second thread segment,
• a second tubular segment with a pin member, the pin member comprising interengageable threads, the interengageable threads having a first thread segment and a second thread segment;
• wherein the first and second thread segments of the pin members each comprise multiple turns of threads,
• wherein the first thread segments of the pin members each comprise load flanks and stab flanks of a first pitch, the first pitch being constant across the first thread segments of the pin members,
• wherein the second thread segments of the pin members each comprise load flanks and stab flanks of a second pitch, the second pitch being constant across the second thread segments of the pin members,
• wherein the threads of the second thread segments of each pin member are formed such that material is removed from the stab flank of the pin threads of the second thread segments to reduce the axial thickness of the threads relative to the axial thickness of the threads of the first segment;
• coupling member comprising box members on both ends of the coupling member, the box members having interengageable threads designed to engage the pin threads of the pin members of the first tubular and the second tubular upon make-up of the threaded connection,
• wherein the threads of the box members have load flanks and stab flanks of a constant pitch,
• wherein the load flanks of the threads of the first and second thread segments are in contact with the mating flanks of the threads of the box members upon makeup of the connection, and
• wherein the reduced axial thickness of the threads of the second thread segments of each pin member causes a gap to be formed between the stab flank of the pin threads and the adjacent flanks of the box threads when the threads of the second thread segments of each pin member are fully engaged with the corresponding mating threads of the box members of the coupling member upon make-up of the threaded connection.

An expandable treaded tubular connection comprising:

• a first tubular segment with a box member, the box member comprising interengageable threads that have load flank and stab flanks of a constant pitch;
• a second tubular segment with a pin member, the pin member comprising interengageable threads for engaging said box member, the irterengageable threads of the pin member having a plurality of thread segments, the plurality of thread segments comprising multiple turns of threads;
• wherein one or more of the thread segments of the pin member comprise threads having a reduced axial thickness relative to the axial thickness of the threads of the box member,
• wherein the multiple turns of threads of the plurality of thread segments each have load flanks and stab flanks of a constant pitch, the pitch being equal to the pitch of the load flanks and stab flanks of the threads of the box member, and
• wherein the load flanks of the multiple turns of threads of the plurality of thread segments are in full engagement with the mating flanks of the threads of the box member upon makeup of the connection.

An expandable threaded tubular connection comprising:

• a first tubular segment with a pin member, the pin member comprising interengageable threads that have load flanks and stab flanks of a constant pitch;
• a second tubular segment with a box member, the box member comprising interengageable threads for engaging said pin member, the interengageable threads of the box member having a plurality of thread segments comprising multiple turns of thread;
• wherein one or more of the tread segments of the box member comprises threads having a reduced axial thickness relative to the axial thickness of the threads of the pin member,
• wherein the multiple turns of threads of the plurality of thread segments each have load flanks and stab flanks of a constant pitch, the pitch being equal to the pitch of the load flanks and stab flanks of the threads of the pin member, and
• wherein the load flanks of the threads of the plurality of thread segments are in full engagement with the mating flanks of the treads of the pin member upon makeup of the connection.