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US 10,308,863 B2Granted
Formation preconditioning using an aqueous polymer preflush
AssigneeShell Oil Company
InventorsLeonardus Bartholomeus Maria Wassing, Esther Christianne Maria Vermolen, Mark Theodoor Looijer, Bartholomeus Marinus Josephus Maria Suijkerbuijk
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Abstract
A method of producing fluid from a formation containing hydrocarbons in which an aqueous polymer preflush fluid is injected into the formation followed by injection of an aqueous polymer displacement fluid, where the aqueous polymer preflush fluid has a total dissolved solids content that is greater than the total dissolved solids content of the aqueous polymer displacement fluid.
Claims14
A method comprising:
- injecting a volume of an aqueous polymer preflush fluid having a total dissolved solids content into a formation comprising hydrocarbons via an injection well extending into the formation, wherein the aqueous polymer preflush fluid comprises water-dispersible ionically charged viscosifying polymer;
- after injecting the aqueous polymer preflush fluid into the formation, injecting an aqueous polymer displacement fluid having a total dissolved solids content into the formation through the injection well, wherein the aqueous polymer displacement fluid comprises water-dispersible ionically charged viscosifying polymer,
- wherein the total dissolved solids content and the polymer concentration of the aqueous polymer preflush fluid is greater than the total dissolved solids content and polymer concentration of the aqueous polymer displacement fluid;
- and producing a produced fluid comprising hydrocarbons from the formation through a production well.
1 more element
Dependencies are inferred from the claim text.