Methods, well cement compositions and lightweight additives therefor
First Claim
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1. A cement composition additive comprising a suspension of fly ash microspheres in a water solution of sodium bentonite.
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Abstract
The present invention provides methods, lightweight well cement compositions and additives for the well cement compositions. The methods of the invention for sealing pipe in a well bore penetrating a zone or formation which readily fractures at low hydrostatic pressure is basically comprised of the steps of providing a lightweight cement composition comprised of a hydraulic cement, water and an additive comprising a suspension of microspheres in water gelled with sodium bentonite, placing the cement composition in the annulus between the pipe and the well bore and allowing the cement composition to set.
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19 Claims
- 1. A cement composition additive comprising a suspension of fly ash microspheres in a water solution of sodium bentonite.
- 9. A cement composition additive comprising a suspension of fly ash microspheres in a water solution of sodium bentonite, wherein said microspheres are present in an amount in the range of from about 30% to about 48% by weight of said additive and said sodium bentonite is present in an amount in the range of from about 1% to about 2% by weight of said additive.
- 15. A cement composition additive comprising a suspension of fly ash microspheres in a water solution of sodium bentonite, wherein said microspheres are present in an amount in the range of from about 30% to about 48% by weight of said additive, said water is present in an amount in the range of from about 50% to about 69% by weight of said additive and said sodium bentonite is present in an amount in the range of from about 1% to about 2% by weight of said additive.
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