Self-sealing well cement composition
AssigneeBJ Services Company
InventorsDan Thomas Mueller, Harold Dean Brannon, Windell Scott Bray
Life of this patent
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Abstract
A cement composition is provided including a cement and a low reactivity particle coated with a swellable polymeric material. The low reactivity particle is coated with a swellable polymeric material at a concentration of about 10 weight percent to about 50 weight percent, based on the weight of the cement. The swellable polymeric material swells to a larger volume when exposed to one or more hydrocarbons, depending on the selected polymeric material. The cement composition is used in a method as a self-sealing cement for cementing an oil and gas well, thereby minimizing or mitigating the unwanted migration of water or hydrocarbons.
Claims12
A cement composition comprising:
- cement;
- and
- a low reactivity particle coated with a swellable polymeric material;
- wherein the low reactivity particle coated with a swellable polymeric material is present at a concentration of about 10 weight percent to about 50 weight percent, based on the weight of the cement and wherein the swellable polymeric material swells to a larger volume when exposed to one or more hydrocarbons.
A method of cementing an oil or gas well, the method comprising:
- providing a cement composition comprising water, cement, and a low reactivity particle coated with a swellable polymeric material;
- wherein the low reactivity particle coated with a swellable polymeric material is present at a concentration of about 10 weight percent to about 50 weight percent, based on the weight of the cement and wherein the swellable polymeric material swells to a larger volume when exposed to one or more hydrocarbons,
- pumping the composition into the well;
- and
- allowing the composition to set.
A method for mitigating loss of hydrocarbon containment due to induced cement fracture, comprising:
- providing a cement composition comprising water, cement, and a low reactivity particle coated with a swellable polymeric material;
- wherein the low reactivity particle coated with a swellable polymeric material is present at a concentration of about 10 weight percent to about 50 weight percent, based on the weight of the cement and wherein the swellable polymeric material swells to a larger volume when exposed to one or more hydrocarbons,
- pumping the composition into the well;
- and
- allowing the composition to set.
Dependencies are inferred from the claim text.