Deep Panuke Project Description - Encana

For re-entry of the existing wells, a “trash cap” will first be removed from the conductor stub 3 m above theseafloor. A “trash cap” is a cylinder device closed on one end that sets over the conductor to keep outmarine organisms or falling debris. Once the trash cap has been removed, a running and retrieving tool isused to back off the temporary abandonment caps. Each of the wells then has a cement plug set that has tobe drilled out.The production wells will all be completed with a downhole packer (plus other ancillary downholeequipment), production tubing, surface controlled subsurface safety valve, a tubing hanger, and a subseaproduction tree. Once all hydrostatic tests and function tests are performed, the production wells will beopened for clean-up flow on the drilling rig. This will remove any water or debris from the wellboreprior to handover for production operations on the MOPU. See Figure 2.8 for details on the productionwells.The injection well will be drilled using similar processes and procedures as with the production wells.Once the surface casing is set in the Wyandot formation, the main well bore will be drilled vertically tothe injection zone in the Upper Mississauga formation located at approximately 2400 m TVD. SeeFigure 2.9 for details on the injection well. Similar to the production well, the completion for theinjection well will consist of tubing, downhole packer, subsurface safety valve, tubing hanger andinjection tree.For the M&NP Option, it is estimated that there will be no surplus condensate produced beyond fuelusage; however, the ability to inject condensate down-hole with the acid gas stream provides operationalflexibility in times of maintenance and/or operational issues. It is currently planned to inject thecondensate with the acid gas into the one injection well that will be drilled west of the MOPU fieldcentre. Injection pumps on the main production platform will be used to pump the condensate down thewell at the required pressures for injection into the downhole disposal zone.This injection well for acid gas and condensate (if necessary) will be drilled into a porous and permeablezone in the Upper Mississauga Formation; the targeted injection zone is the Tidal-Fluvial Sandstone.The impermeable Naskapi shales located directly above will prevent any migration of injected acid gasor condensate. The Upper Mississauga Formation will be capable of containing the entire acid gas andsurplus condensate volumes that will be produced over the life of the Project. Migration of injectionfluids to other formations and/or to the surface is considered extremely unlikely. The possibility of acidgas injection souring the Panuke oil zone is also considered to be extremely unlikely. See Figures 2.8and 2.9 for production and injection well schematics.Deep Panuke Volume 4 (Environmental Assessment Report)• November 2006 2-25