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• W4229753057 abstract "Implementation of Advanced Cementing Techniques to Improve Long Term Zonal Isolation in Steam Assisted Gravity Drainage Wells David Stiles; David Stiles Schlumberger Search for other works by this author on: This Site Google Scholar Doug Hollies Doug Hollies EnCana Corp Search for other works by this author on: This Site Google Scholar Paper presented at the SPE International Thermal Operations and Heavy Oil Symposium and International Horizontal Well Technology Conference, Calgary, Alberta, Canada, November 2002. Paper Number: SPE-78950-MS https://doi.org/10.2118/78950-MS Published: November 04 2002 Cite View This Citation Add to Citation Manager Share Icon Share Twitter LinkedIn Get Permissions Search Site Citation Stiles, David, and Doug Hollies. Implementation of Advanced Cementing Techniques to Improve Long Term Zonal Isolation in Steam Assisted Gravity Drainage Wells. Paper presented at the SPE International Thermal Operations and Heavy Oil Symposium and International Horizontal Well Technology Conference, Calgary, Alberta, Canada, November 2002. doi: https://doi.org/10.2118/78950-MS Download citation file: Ris (Zotero) Reference Manager EasyBib Bookends Mendeley Papers EndNote RefWorks BibTex Search Dropdown Menu nav search search input Search input auto suggest search filter All ContentAll ProceedingsSociety of Petroleum Engineers (SPE)SPE International Thermal Operations and Heavy Oil Symposium Search Advanced Search AbstractSteam Assisted Gravity Drainage (SAGD) development of the Athabasca oilsands has led to a unique approach to horizontal drilling combining manyexisting and new technologies. From a cementing perspective, preventingdegradation of the cement sheath due to induced stress cracking and preventinggas migration are the two main challenges that must be addressed in order toachieve the objective of long-term zonal isolation across the length of thewellbore.One of the main functions of cement is to prevent fluid communicationbetween formations or to surface throughout the life of the well, includingafter abandonment. Even when cementing operations have provided a good initialhydraulic seal, changes in downhole conditions can induce stresses to destroythe integrity of the cement sheath resulting in a loss of zonal isolation.Changes in downhole stress conditions that occur during the life of a SAGD wellare particularly extreme. Stresses in the cement sheath induced by extremetemperature cycling can result in severe mechanical damage and ultimate failureof the cement sheath, potentially leading to leakage of steam from thereservoir. Along with the requirement of maintaining cement sheath integrity, special cement design and placement considerations must be taken to preventannular gas influx and migration. Annular gas migration prior to the setting ofthe cement can lead to channels that would not only provide a pathway for gasbut also a potential conduit for steam to escape into shallower zones or tosurface.A new approach to cement design was undertaken to fulfill the requirementsof cementing PanCanadian's (now EnCana Corp.) SAGD wells in Christina Lake. Acement system with improved flexibility to resist stress cracking was designedand implemented. This system is engineered to have a low Young's Modulus whilemaintaining high compressive and tensile strengths as compared to conventionalcement systems. The permeability of the set cement is very low, yielding amaterial that is highly resistant to attack by corrosive fluids. Finally, thesystem is designed to be gas tight to prevent gas migration. This paperpresents data on the new cementing techniques and technologies used as well ascase history results on the six wells cemented at Christina Lake.IntroductionApproximately 20% of all the McMurray bitumen is recoverable using stripmining operations currently being practiced by Syncrude and Suncor in the FortMcMurray area. The remainder of the bitumen is classified as in-situ. These oilsand deposits cover a large region of Central and Northeast Alberta, reachingas far north as Fort McKay and as far south as Lloydminster. It has beenestimated that the total recoverable amount of oil could exceed two trillionbarrels. Oil content in the McMurray sands can range from 30–90% with gravitiesranging between 5° and 10° API.The Christina Lake wells drilled in the context of this project utilizedSAGD as a means for recovering oil from the unmineable portions of the McMurrayoil sands formation.1On a commercial scale, SAGD drilling is a relatively new approach toexploiting the in-situ oil sand resources. In SAGD, sets of horizontal wellpairs are drilled with about 5m vertical spacing. During the production phase, steam is continuously injected into the upper horizontal wellbore. The mobilityof the bitumen is reduced as the steam chamber is created in the reservoir.This allows the oil with the assistance of gravity to drain into the lowerhorizontal wellbore. Injection temperatures of the steam are typically around230°C. Keywords: flexible cement, temperature increase, complex reservoir, sagd well, drilling operation, compressive strength, oil sand, enhanced recovery, christina lake, spe ps-cim choa 78950 Subjects: Drilling Operations, Casing and Cementing, Improved and Enhanced Recovery, Unconventional and Complex Reservoirs, Cement formulation (chemistry, properties), Thermal methods, Oil sand, oil shale, bitumen This content is only available via PDF. 2002. SPE/PS-CIM/CHOA International Thermal Operations and Heavy Oil Symposium and International Horizontal Well Technology Conference You can access this article if you purchase or spend a download." @default.
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• W4229753057 title "Implementation of Advanced Cementing Techniques to Improve Long Term Zonal Isolation in Steam Assisted Gravity Drainage Wells" @default.
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