Method of drilling and operating a subsea well

摘要

A method of preparing and operating a subsea well ( 23 ), comprising the steps of: locating a drill-through subsea tree ( 24 ) on a subsea wellhead; sealingly connecting a high pressure drilling riser ( 22 ) between the tree and a drilling platform at the sea surface; mounting a blow out preventer ( 16 ) at the top of the riser ( 22 ); drilling the well through the drilling riser and the subsea tree; and establishing a production connection between the tree ( 24 ) and a production collection facility at the sea surface through a production riser ( 52 ) which is separate from the drilling riser ( 22 ).