Ursa TLP Well Sytems

摘要

The original Ursa TLP development plan called for 16 production wells, 11 firm and 5 contingent Initial design was for 11 TLP wells and 3 subsea wells. The plan also included batch setting 21 well positions and pre-drilling 6 of the TLP wells in 3,950' of water in MC block 810. IN late 1997 a significant shallow flow occurred at the batch set site during the final batch operatons. Events proceeded such that all wells were lost and the site became unusable for the foundation support. Development plans were modified to move the installation site to an area with still significant but smaller shallow flow risk in MC block 809, in 3,800' of water. The batch set was reduced to only 12 TLP production wells. Drilling was to proceed with 1 to 2 pre-drills. Subsea wells were deleted from the plan. This paper disusses the Ursa well systems including early drilling, final batch set and pre-drills, the STSLP rig, riser systems and completion systems. It presents how these areas approached shoallow flow and the other challenghes to produce the Ursa reservoirs.