Cementing multi-lateral wells
First Claim
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1. A method of cementing conduits in a multi-lateral subterranean well whereby the set cement can withstand impacts and shocks subsequently generated by drilling and other well operations without shattering, comprising the steps of:
- (a) introducing a cement slurry composition which sets into a high strength impact resistant solid mass between said conduits and the walls of said well, said cement slurry composition comprisinga styrene/butadiene aqueous latex,an effective amount of a latex stabilizer selected from the group consisting of surfactants having the formula ##STR6## wherein R is an alkyl group having from 5 to 30 carbon atoms, Ph is phenylene and m is an integer in the range of from about 5 to about 50, and surfactants of the general formula ##STR7## wherein R1 is selected from table group consisting of C1 -C30 alkyl groups, C5 -C6 cycloalkyl groups, C1 -C4 alkyl substituted C5 -C6 cycloalkyl groups, phenyl, alkyl substituted phenyl of the general formula (R3)a Ph--where Ph is phenylene, R3 is a C1 -C18 alkyl group and a is an integer of from 1 to 3, and phenyl (C1 -C18) alkyl groups having a total of from about 8 to about 28 carbon atoms, R2 is a substituted ethylene group of the formula --CH2 CH R4 wherein R4 is selected from hydrogen, methyl, ethyl or mixtures thereof, and n is a number from 0 to about 40 provided that when R1 is phenyl or alkyl substituted phenyl, n is at least 1 and X is any compatible cation, andhydraulic cement; and
(b) allowing said cement slurry composition to set in said well.
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Abstract
The present invention provides methods of cementing the junction of multi-lateral wells whereby the set cement can withstand impacts and shocks without shattering. A cement slurry composition which sets into a high strength impact resistant solid mass is utilized comprised of a styrene/butadiene aqueous latex, a latex stabilizer, hydraulic cement and appropriate cementing additives.
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Citations
20 Claims
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1. A method of cementing conduits in a multi-lateral subterranean well whereby the set cement can withstand impacts and shocks subsequently generated by drilling and other well operations without shattering, comprising the steps of:
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(a) introducing a cement slurry composition which sets into a high strength impact resistant solid mass between said conduits and the walls of said well, said cement slurry composition comprising a styrene/butadiene aqueous latex, an effective amount of a latex stabilizer selected from the group consisting of surfactants having the formula ##STR6## wherein R is an alkyl group having from 5 to 30 carbon atoms, Ph is phenylene and m is an integer in the range of from about 5 to about 50, and surfactants of the general formula ##STR7## wherein R1 is selected from table group consisting of C1 -C30 alkyl groups, C5 -C6 cycloalkyl groups, C1 -C4 alkyl substituted C5 -C6 cycloalkyl groups, phenyl, alkyl substituted phenyl of the general formula (R3)a Ph--where Ph is phenylene, R3 is a C1 -C18 alkyl group and a is an integer of from 1 to 3, and phenyl (C1 -C18) alkyl groups having a total of from about 8 to about 28 carbon atoms, R2 is a substituted ethylene group of the formula --CH2 CH R4 wherein R4 is selected from hydrogen, methyl, ethyl or mixtures thereof, and n is a number from 0 to about 40 provided that when R1 is phenyl or alkyl substituted phenyl, n is at least 1 and X is any compatible cation, and hydraulic cement; and (b) allowing said cement slurry composition to set in said well. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A method of cementing casing and liners in a multilateral subterranean well whereby the set cement can withstand the impacts and shocks subsequently generated by drilling and other well operations without shattering comprising the steps of:
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(a) introducing a cement slurry composition which sets into a high strength impact resistant solid mass between said casing and liners and the walls of said well, said cement slurry composition comprising a styrene/butadiene aqueous latex containing water in an amount of about 50% by weight of said latex and the weight ratio of styrene to butadiene in said latex being in the range of from about 10%;
90% to about 90%;
10%,a latex stabilizer selected from the group consisting of surfactants having the formula ##STR10## wherein R is an alkyl group having from 5 to 30 carbon atoms, Ph is phenylene and m is an integer in the range of from about 5 to about 50, and surfactants of the general formula ##STR11## wherein R1 is selected from the group consisting of C1 -C30 alkyl groups, C5 -C6 cycloalkyl groups, C1 -C4 alkyl substituted C5 -C6 cycloalkyl groups, phenyl, alkyl substituted phenyl of the general formula (R3)a Ph--where Ph is phenylene, R3 is a C1 -C18 alkyl group and a is an integer of from 1 to 3, and phenyl (C1 -C18) alkyl groups having a total of from about 8 to about 28 carbon atoms, R2 is a substituted ethylene group of the formula --CH2 CH R4 wherein R4 is selected from hydrogen, methyl, ethyl or mixtures thereof, and n is a number from 0 to about 40 provided that when R1 is phenyl or alkyl substituted phenyl, n is at least 1 and X is any compatible cation, and hydraulic cement present in said composition in an amount in the range of from about 111% to about 285% by weight of said styrene/butadiene aqueous latex; and (b) allowing said cement slurry composition to set in said well. - View Dependent Claims (14, 15, 16, 17, 18)
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19. A method of cementing casing and liners in a multilateral subterranean well whereby the set cement can withstand the impacts and shocks subsequently generated by drilling and other well operations without shattering comprising the steps of:
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(a) introducing a cement slurry composition which sets into a high strength impact resistant solid mass between said casing and liners and the walls of said well, said cement slurry composition comprising a styrene/butadiene aqueous latex containing water in an amount of about 50% by weight of said latex and the weight ratio of styrene to butadiene in said latex being about 25%;
75%,a latex stabilizer selected from the group consisting of nonylphenol ethoxylated with in the range of from about 20 to about 30 moles of ethylene oxide and sodium C12-15 pareth-15 sulfonate present in said composition in an amount in the range of from about 5% to about 30% by weight of said styrene/butadiene aqueous latex, and Portland Class G hydraulic cement present in said composition in an amount in the range of from about 111% to about 285% by weight of said styrene/butadiene aqueous latex; and (b) allowing said cement slurry composition to set in said well. - View Dependent Claims (20)
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Specification