E - Fixed Constructions – 21 – B
Patent
E - Fixed Constructions
21
B
E21B 29/06 (2006.01) E21B 7/08 (2006.01) E21B 7/18 (2006.01) E21B 17/00 (2006.01)
Patent
CA 2677138
Much Heavy-Oil exists in the Alaskan Arctic, below thick Permafrost zones, and Offshore, in deep water: two Cold Environments known to reduce Heavy-Oil fluidity. Steam Injection from cold surfaces is the best method to economically restore Heavy-Oil fluidity downhole. It requires, however, minimum heat losses from well tubulars carrying Steam or heated Heavy-Oil. The patented process of Reference (1) uses a Multilateral well. Combining it with easy access to and precise control of its Branch-wells temperatures, can do it, with: - circulating downhole a colder fluid, to sub-cool the outer-casing, - using two "super-insulated", vertical coaxial tubulars, dedicated to carrying Steam downhole, while lifting-up heated Heavy-Oil around Steam, - connecting several horizontal Branch-wells to multiple pairs of vertical, or curved, "super-insulated" tubular Thermal Barriers, with downhole flow-control Modular Systems, to sequentially switch Branch-wells from Steam Injection to Heavy-Oil Production, and vice-versa.
Gondouin Michel
Na
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