Deep Panuke Project Description - Encana

These subsea structures may be fastened to the seabed via four piles ranging in size from 610 mm [24inch] to 910 mm [36 inch] driven approximately 8 to 12 m below seabed. These piles would be drivenwith an IHC S-90 (or equivalent) hammer which has a maximum energy output of 89,000 Newtonmeters(66,000 foot-pounds). The actual pile driving duration is estimated to be 0.5 to 1 hours basedupon the previous experience of driving the Panuke platform docking piles.Although the total number of piles has increased for the revised Project design basis, the diameter andlength of the piles is smaller requiring an overall shorter duration of the activity with a lower energyhammer. As a result, the potential pile driving requirements associated with the 2006 Project basis isless than the Project basis approved in the 2002 CSR; refer to Table 2.3 for comparison.2.3.7 Onshore Facilities and Pipeline (M&NP Option Only)Onshore pipeline installation activities as presented in the original CSR have not changed; therefore,these activities are not addressed in this section as there is no need to re-state.2.3.8 Development Well ConstructionDevelopment wells will include five to eight production wells and one injection well, all of which willbe subsea. A jack-up drilling unit will be used to complete the existing wells and to drill the subseawells. A jack-up drilling unit is a MODU that has legs that can be jacked up or down. Once towed to thesite, the legs are jacked down until they are in contact with the seafloor, then the rig platform is elevateduntil it is approximately 25 m above the water surface. The jack-up drilling unit will remain on locationduring drilling and completion operations and then be removed. Well construction activities areexpected to take approximately 430 days (five new drill wells at 60 days each plus four re-entry wells at32 days each) in total to complete.The normal drilling program for all Deep Panuke wells involves conventional hole and casing/pipesizes. All casing designs are based on CNSOPB Offshore Petroleum Drilling Regulations.Deep Panuke Volume 4 (Environmental Assessment Report)• November 2006 2-22