Oil-based settable spotting fluid
AssigneeHalliburton Energy Services, Inc.
InventorsJames E. Griffith, Ricky A. Cox, Jiten Chatterji, John L. Dennis, Jr.
Life of this patent
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Abstract
Oil-based settable spotting fluid compositions and methods of using the compositions are provided. The oil-based settable spotting fluid compositions are basically comprised of oil, an emulsifying surfactant for emulsifying the oil with water whereby an oil-external emulsion is formed, a de-emulsifying surfactant which in time de-emulsifies said oil-external emulsion when the emulsion is contacted with external water, a hydraulic settable component selected from the group consisting of ASTM Class C or the equivalent fly ash and ASTM Class F or the equivalent fly ash together with a source of calcium and water selected from the group consisting of fresh water and salt water.
Claims20
An oil containing settable spotting fluid composition for use in cementing wells comprising:
- oil;
- an emulsifying surfactant for emulsifying said oil with water whereby an oil-external emulsion is formed;
- a de-emulsifying surfactant which de-emulsifies said oil-external emulsion when the emulsion is contacted with external water;
- a hydraulic settable component selected from the group consisting of ASTM Class C fly ash and ASTM Class F fly ash together with hydrated lime;
- and
- water present in an amount sufficient to form a slurry.
An oil containing settable spotting fluid composition for use in cementing wells comprising:
- oil comprised of one or more long chain mineral oils;
- an emulsifying surfactant for emulsifying said oil with water whereby an oil-external emulsion is formed comprised of alkylphenol hydroxypolyoxyethylene and is present in an amount in the range of from about 0.01% to about 2% by weight of water in said composition;
- a de-emulsifying surfactant which de-emulsifies said oil-external emulsion when the emulsion is contacted with external water comprised of an ethoxylated alkyl alcohol glycol ether ethoxylated with from about 3 to about 10 moles of ethylene oxide and wherein the alkyl alcohol has from about 12 to about 16 carbon atoms, said de-emulsifying surfactant being present in an amount in the range of from about 0.01% to about 1% by weight of oil in said composition;
- a hydraulic settable component selected from the group consisting of ASTM Class C fly ash and ASTM Class F fly ash together with hydrated lime;
- and
- water present in an amount sufficient to form a slurry.
An oil containing settable spotting fluid composition for use in cementing wells comprising:
- oil comprised of one or more long chain mineral oils;
- an emulsifying surfactant for emulsifying said oil with water whereby an oil-external emulsion is formed comprised of alkylphenol hydroxypolyoxyethylene present in an amount in the range of from about 0.01% to about 1% by weight of water in said composition;
- a de-emulsifying surfactant which in time de-emulsifies said oil-external emulsion when the emulsion is contacted with external water comprised of an ethoxylated alkyl alcohol glycol ether ethoxylated with from about 3 to about 10 moles of ethylene oxide and wherein said alkyl alcohol has from about 12 to about 16 carbon atoms, said de-emulsifying surfactant being present in an amount in the range of from about 0.9% to about 0.5% by weight of oil in said composition;
- a defoaming agent for defoaming water when it is mixed with said oil comprised of polypropylene glycol, particulate hydrophobic silica and a liquid diluent, said de-foaming agent being present in an amount in the range of from about 0.01% to about 0.1% by weight of the water in said composition;
- a hydraulic settable component comprised of ASTM Class F fly ash present in an amount in the range of from about 55% to about 65% by weight of oil in said composition;
- hydrated lime present in said composition in an amount of about 5% by weight of said hydraulic settable component in said composition;
- and
- water selected from the group consisting of fresh water and salt water present in an amount sufficient to form a slurry having a density in the range of from about 12 to about 15 pounds per gallon.
Dependencies are inferred from the claim text.