Polymer shell encapsulated gas as a cement expansion additive
AssigneeBJ Services Company
InventorVirgilio C. Go Boncan
Life of this patent
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Abstract
Cement compositions containing an expandable material are disclosed. The compositions are suitable for use in oil and gas wells. An example of such an expandable material is a polymer encapsulated chemical that expands upon heating. Examples of cement compositions containing polymer encapsulated isobutane or isopentane are disclosed. The use of cement compositions containing an expandable material can reduce the formation of micro-annulus or other deleterious physical properties in the set cement.
Claims25
A method of setting cement to reduce contraction of the cement, the method comprising:
- contacting cement, water, and an expandable material comprising a polymer encapsulated organic chemical to prepare a slurry, wherein the expandable material is unexpanded;
- heating the slurry wherein the expandable material expands;
- and
- allowing the slurry to harden to prepare a set cement product.
A method of cementing a wellbore, the method comprising:
- contacting cement, water, and an expandable material comprising a polymer encapsulated organic chemical to prepare a slurry, wherein the expandable material is unexpanded;
- pumping the slurry into the wellbore, wherein the slurry is heated and the expandable material expands;
- and
- allowing the slurry to harden to prepare a set cement product.
Dependencies are inferred from the claim text.