Statoil’s First Oil Sands Field Development in Canada – Completion Challenges and Design
SPE Stavanger, October 12th 2011 1-
Classification: Internal
2011-08-15
Statoil’s Oil Sands Land Position ¾1,100 square kilometres of oil sands leases in the Athabasca region, Alberta, Canada ¾The reserve potential are 2.2 billion bbl of recoverable bitumen ¾The Kai Kos Dehseh(*) full field SAGD project development will produce 200,000 b/d when all 4 phases have been developed ¾Several hundreds SAGD wells are required to meet the production goals Note: 40% of the project is farmed down to PTTEP.
First SAGD Project ¾Our Leismer Demonstration Project is the first phase to be developed using SAGD technology and the facility is now producing first oil (Jan 2011). ¾The project is located north-east of Edmonton, 30km west of Conklin ¾23 well pairs on 4 well pads, plus a central processing facility to generate steam ¾18,800 bbl/d capacity plant
Why Sand Control? ¾Well sanding and plugging ¾Erosion and failure of pumps ¾Erosion of surface equipment ¾Treating, separation and sand disposal costs
Slotted Liner ¾Straight Slots – Slots are cut with equal width through the wall of the pipe both ID and OD. Common applications are SAGD injector wells. ¾Seamed Keystone Slots* – Slots are narrow at the liner surface and increasing in width at the interior, this let sand that does enter pass easily through the slots without plugging. * Or Rolled Top Slots
Slot Pattern ¾ Slotted liners are typically cut with four rows per slotted foot, with rows staggered, 50% offset of each other. ¾ Rows are staggered in order to preserve most of the pipe's original strength and integrity. Moreover, when slots are evenly distributed over the pipe surface, drainage is more efficient.
Wire Wrapped Screen ¾ All-Welded Wire Wrapped base pipe screen ¾ Wedge Wire Screen allows the user to maximize the open area to flow while maintaining a strict gauge as low as 0.003” (75 micron) ¾ The large inlet area allows higher production rates with lower entrance velocity and minimal pressure drop
Down Hole Monitoring Challenges ¾Monitoring of steam chamber development ¾Accurate and reliable measurements at high temperatures ¾Hydrogen darkening of fibre optic cable ¾Deployment and change-outs
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2011-08-15
Wellhead & Xmas Tree Challenges • Well control at all stages • High temperature seals • Wellhead growth • Facilitate multi-string design • Cost efficient well intervention and workover operations • Standardization and re-use of equipment
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Completion Design – Operations Phase
30 - Classification: Internal
2011-08-15
ESP High Temperature Challenges ¾ Materials & thermal growth ¾ Well bore geometry ¾ Steam flashing ¾ Abrasives & scale ¾ Down hole monitoring ¾ Deployment ¾ Efficient change-out ¾ Finding root cause of failure