Fluid spacer composition for use in well cementing
AssigneeHalliburton Company
InventorsWillis A. Weigand, Patty L. Totten
Life of this patent
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Abstract
The present invention relates to an aqueous composition and method for substantially preventing contact between non-compatible hydrocarbonaceous and aqueous fluids employing an aqueous spacer composition. The composition comprises an aqueous fluid, an admixture of nonylphenols and, preferably, at least one member selected from the group of a sulfonated linear C.sub.8 to C.sub.18 straight chain alcohol ethoxylated with an average of from about 2 to about 20 moles of ethylene oxide, a low molecular weight aliphatic glycol ether containing from about 3 to about 12 carbon atoms and an alcohol containing from about 3 to about 8 carbon atoms ethoxylated with an average of 2 to 4 moles of ethylene oxide.
Claims16
A method of emplacing an aqueous cement slurry into a well bore which contains an oil base composition having dispersed therein oil wet particles, which comprises:
- introducing into said well bore and into contact with said oil based composition, a spacer composition comprising:
- an aqueous fluid;
- a nonylphenol admixture comprising from about 20 to about 80 percent by volume nonylphenols ethoxylated with from about 1 to about 6 moles of ethylene oxide and from about 20 to about 80 percent by volume nonylphenols ethoxylated with from about 7 to about 14 moles of ethylene oxide, present in an amount of from about 1 to about 10 percent by volume of said composition;
- and,
- at least one member selected from the
- group consisting of:
- a sulfonated linear C.sub.8 to C.sub.18 straight chain alcohol ethoxylated with from 2 to 20 moles of ethylene oxide;
- an aliphatic glycol ether containing from about 3 to about 12 carbon atoms, and
- an alcohol containing from about 3 to about 8 carbon atoms ethoxylated with from about 2 to about 4 moles of ethylene oxide, said alcohol being different from said aliphatic glycol when present, said selected member being individually present in an amount of from about 0 to about 5 percent by volume of said composition;
- displacing at least a portion of said oil based composition from an area in said well bore into which said cement slurry is to be emplaced with said spacer composition;
- displacing at least a portion of said spacer composition from said area in said well bore into which an aqueous cement slurry is to be emplaced with said cement slurry;
- and
- permitting said cement slurry to set up in said area.
A method of cementing an area of a borehole penetrating a subterranean formation in which a casing is present, said borehole containing in said area to be cemented an oil based drilling mud, which comprises:
- introducing a spacer composition comprising:
- an aqueous fluid,
- a nonylphenol admixture comprising from about 20 to about 80 percent by volume nonylphenols ethoxylated with from about 1 to about 6 moles of ethylene oxide and from about 20 to about 80 percent by volume nonylphenols ethoxylated with from about 7 to about 14 moles of ethylene oxide, present in an amount of from about 1 to about 10 percent by volume of said composition;
- and,
- at least one member selected from the group
- consisting of:
- a sulfonated linear C.sub.8 to C.sub.18 straight chain alcohol ethoxylated with from 2 to 20 moles of ethylene oxide;
- an aliphatic glycol ether containing from about 3 to about 12 carbon atoms, and
- an alcohol containing from about 3 to about 8 carbon atoms ethoxylated with from about 2 to about 4 moles of ethylene oxide, said alcohol being different from said aliphatic glycol when present, said selected member being individually present in an amount of from about 0 to about 5 percent by volume of said composition;
- into said borehole in a quantity sufficient to displace at least a portion of said drilling mud from the area to be cemented,
- introducing an aqueous cement slurry into said borehole to displace at least a portion of said spacer composition from the area to be cemented and place said cement slurry into said area;
- and,
- permitting said cement slurry to set up in said area to be cemented.
Dependencies are inferred from the claim text.