Patent ID: 11927066
Assignee: CONOCOPHILLIPS COMPANY
Field: Civil engineering (Other fields)
Classification: CPC E | IPC E

Claim 0:
1. A process for drilling and completing a subsea wellbore from a jack-up rig in water of depth about 100 meters or less, wherein the subsea wellbore is connected to and communicates with a subsea wellhead, the process comprising:
a) installing a blow-out preventer on the jack-up rig, wherein the blow-out preventer includes a plurality of ram configurations, control pods, and an accumulator bank;
b) installing a riser between said blow-out preventer and said subsea wellhead in water up to 100 m depth, whereby said blow-out preventer communicates with said subsea wellbore; and
c) connecting via an offshore rig crane a lower mass subsea suspension head assembly between said riser and said subsea wellhead, wherein said subsea suspension head assembly consists of a first connector for connecting the suspension head assembly to a wellhead, a reentry hub, a control panel for actuating the rams and connectors, a double ram or valve block for sealing the well, including casing ram and a shear seal ram, and a second connector for connecting the suspension head assembly to a riser, wherein said suspension head assembly has a mass of between 20,000 and 60,000 kg and is installed over the side of the jack-up;
d) installing and testing a completion string without installation of a temporary plug, wherein a side inlet and side inlet fail safe close valves are provided in the suspension head assembly below the shear seal ram, the step of installing and testing the completion string including closing the casing ram and opening the side inlet valves to deliver fluid to the well.