Polymeric Extenders for Flexible Cement
AssigneeSchlumberger Technology Corporation
InventorsRobert Williams, Emmanuel Therond, Terry Dammel
Life of this patent
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Abstract
A flexible cement stable at high temperatures contains an extender that is a finely ground polyetheretherketone. The cement retains its flexibility for long times at high temperatures, for example those used for steam assisted gravity drainage of heavy oil formations, for example from about 480 to about 644° F. (249 to 340° C.). Compressive strength, tensile strength, permeability and porosity are all stable and suitable for high temperature down-hole oilfield use.
Claims14
A cement comprising an additive comprising finely ground polyetheretherketone.
A method of cementing a cased well penetrating a subterranean formation comprising preparing a cement comprising finely ground polyetheretherketone, and injecting said cement into the annulus between the casing and the formation.
A method of squeeze cementing a well penetrating a subterranean formation comprising preparing a cement comprising finely ground polyetheretherketone and injecting said cement into the well at a pressure sufficient to force the cement into a subterranean void.
Dependencies are inferred from the claim text.