Patent ID: 6035938
Filing Date: 2000-03-14
Classification: E02B,E21B

Abstract:
A wellhead system for use in drilling a subsea well from a jack up platform, comprisinga wellhead housing adapted to be installed on an outer casing of a subsea well,a first riser adapted to be lowered into landed position over the upper end of the housing, anda second riser adapted to be lowered through the first riser and onto the upper end of the wellhead housing to form an upward continuation of the bore of the housing,said first riser having a connector on its lower end including locking means movable between outer positions, which permit them to be lowered over the upper end of the housing and the lower end of the second riser to be lowered onto and raised from the wellhead housing, and inner positions in locking engagement with means on the adjacent ends of the housing and second riser, anda casing hanger adapted to be lowered through the second riser for landing within the well in order to suspend an inner casing string within the outer casing string.