Light weight high temperature well cement compositions and methods
AssigneeHalliburton Energy Services, Inc.
InventorsLance E. Brothers, D. Chad Brenneis, Jerry D. Childs
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Abstract
The present invention provides light weight high temperature well cement compositions and methods. The compositions are basically comprised of calcium phosphate cement, water, a foaming agent, a foam stabilizer and a gas present in an amount sufficient to form a foam having a density in the range from about 11.5 to about 15 pounds per gallon.
Claims20
A light weight well cement composition useful in cementing high temperature wells containing carbon dioxide comprising:
- calcium aluminate present in an amount in the range of from about 15% to about 40% by weight of said composition;
- sodium polyphosphate present in an amount in the range from about 5% to about 20% by weight of said composition;
- fly ash present in an amount in the range of from about 25% to about 45% by weight of said composition;
- sufficient water to form a pumpable slurry;
- a foaming agent comprising an alpha-olefinic sulfonate having the formula
- H(CH.sub.2).sub.n --CH=CH--(CH.sub.2).sub.m SO.sub.3 Na
- wherein n and m are integers in the range of from about 6 to about 16, said foaming agent being present in an amount in the range of from about 1% to about 3% by weight of said composition;
- a foam stabilizer comprising a betaine having the formula
- R--CONHCH.sub.2 CH.sub.2 N.sup.+ (CH.sub.3).sub.2 CH.sub.2 CO.sub.2
- wherein R is a radical selected from decyl, cetyl, oleyl, lauryl or cocoyl, said from stabilizer being present in an amount in the range of from about 0.5% to about 1.5% by weight of said composition;
- and
- a gas present in an amount sufficient to form a foam having a density in the range of from about 11.5 to about 15 pounds per gallon.
A light weight well cement composition useful in cementing high temperature wells containing carbon dioxide comprising:
- calcium aluminate present in an amount of about 28% by weight of said composition;
- sodium polyphosphate present in an amount of about 19% by weight of said composition;
- ASTM class F fly ash present in an amount of about 49% by weight of said composition;
- sufficient water to form a pumpable slurry;
- a foaming agent comprising a sulfonic acid alkane sodium salt present in an amount of about 3% by weight of said composition;
- a foam stabilizer comprising cocoylamidopropylbetaine present in an amount of about 1% by weight of said composition;
- and
- a gas present in an amount sufficient to form a foam having a density of about 12.5 pounds per gallon.
A method of cementing a high temperature subterranean zone containing carbon dioxide penetrated by a well bore comprising the steps of:
- (a) forming a light weight well cement composition comprised of calcium aluminate, sodium polyphosphate, fly ash, sufficient water to form a pumpable slurry, a foaming agent comprising an alpha-olefinic sulfonate having the formula
- H(CH.sub.2).sub.n --CH=CH--(CH.sub.2).sub.m SO.sub.3 Na
- wherein n and m are integers in the range of from about 6 to about 16, a foam stabilizer comprising a betaine having the formula
- R--CONHCH.sub.2 CH.sub.2 N.sup.+ (CH.sub.3).sub.2 CH.sub.2 CO.sub.2.sup.-
- wherein R is a radical selected from decyl, cetyl, oleyl, lauryl or cocoyl and a gas present in an amount sufficient to form a foam having a density in the range from about 11.5 to about 15 pounds per gallon;
- (b) pumping said cement composition into said subterranean zone by way of said well bore;
- and
- (c) allowing said cement composition to set into a hard impermeable mass.
Dependencies are inferred from the claim text.