Auxiliary offshore rig and methods for using same

Details Auxiliary offshore rig and methods for using same Auxiliary offshore rig and methods for using same

E - Fixed Constructions

21

B

255/14, 61/8

E21B 19/00 (2006.01) E21B 15/00 (2006.01) E21B 15/02 (2006.01) E21B 19/14 (2006.01)

Patent

CA 1109053

Abstract of the Disclosure An auxiliary offshore rig and methods for using same wherein the auxiliary offshore rig is adapted to be used in conjunction with a primary offshore rig on an off- shore platform for relieving the primary offshore rig of well activities relating to tubular member or cable opera- tions. The auxiliary offshore rig includes in one embodi- ment a truss member mounted for movement along the platform, a racking tower for receiving tubular members therein mounted on the truss member, and a working cage mounted within the racking tower and supported by the truss member adapted to be positioned in alignment with the well for providing a secondary working area beneath the rig floor which is mounted atop the racking tower. In a second embodiment, the auxiliary offshore rig includes the truss member, the racking tower, and a drill tower which is mounted atop the racking tower for use in drilling opera- tions, the drill tower supporting a crown block assembly movably mounted upon a crown block support member mounted with the upper end of the drill tower, with the crown block assembly supporting a travelling block for vertically rais- ing and lowering tubular members with respect to the racking tower. The methods for using the auxiliary offshore rig of the present invention includes in one instance the coordi- nated, simultaneous raising and lowering of tubular members into the well in order to reduce tripping time into the well. Further, the methods of the present invention include a procedure whereby a tubular member supported by the -1- offshore rig is connected with a service riser in such a fashion as to prevent compressive loading on the service riser with any live loads.

322405

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