Drilling system for deep water offshore locations

Details Drilling system for deep water offshore locations Drilling system for deep water offshore locations

B - Operations, Transporting

63

B

61/9, 114/58.2

B63B 35/44 (2006.01) B63B 27/16 (2006.01) E21B 17/01 (2006.01)

Patent

CA 1056225

DRILLING SYSTEM FOR DEEP WATER OFFSHORE LOCATIONS (D#74,191-F) ABSTRACT OF THE DISCLOSURE A system for drilling and for producing subsea wells in relatively deep waters normally subjected to severe wave and current conditions. A floating drilling vessel or production unit is maintained in position over the well site. A riser pipe, maintained under constant tension, depends from the drilling or production vessel downwardly to and operably engages a well head. An elongated caisson depends from the drilling or production vessel to form a protective area about the riser pipe upper end. As a result, stresses induced in the riser pipe upper end by wave and current forces acting on the riser are thereby greatly reduced. - I -

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