Method of application of sliding-ring polymers to enhance elastic properties in oil-well cement
AssigneeSaudi Arabian Oil Company
InventorsHasmukh A. Patel, Peter Boul, Carl Thaemlitz
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Abstract
This document relates to methods for improving the tensile and elastic properties of cement of an oil well using cement compositions that contain sliding-ring polymer additives. The cement compositions containing the sliding-ring polymer additives exhibit increased stiffness while having a minimum impact on compressive strength, as compared to the same cement without the sliding-ring polymer additive.
Claims29
A method for preventing the formation of micro-cracks and fractures in the cement of an oil well, the method comprising providing to the oil well a cement composition comprising cement and a sliding-ring polymer additive, the sliding-ring polymer additive comprising at least two molecules of a polyrotaxane, wherein the polyrotaxane comprises:
- a linear polymer;
- at least one ring compound, wherein the linear polymer is threaded through the opening of the ring compound;
- and
- stopper groups disposed at both end terminals of the linear polymer;
- wherein at least one of the linear polymer and the ring compound is substituted with a hydrophobic or non-ionic group or combination thereof;
- and
- the at least two molecules of polyrotaxane are cross-linked to each other through a chemical bond.
Dependencies are inferred from the claim text.