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US 7,842,652 B2Granted
Cement compositions comprising humic acid grafted fluid loss control additives
AssigneeHalliburton Energy Services, Inc.
InventorsSam Lewis, Jiten Chatterji, Bobby J. King, D. Chad Brenneis
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Abstract
Exemplary embodiments of the cement compositions comprise water, a cement, and a fluid loss control additive, the fluid loss control additive comprising a graft copolymer. The graft copolymer comprises a backbone and at least four grafted monomers selected from the group consisting of 2-acrylamido-2-methylpropanesulfonic acid, acrylamide, acrylic acid, vinylphosphonic acid, diallyldimethylammonium chloride, and salts thereof. The backbone of the graft copolymer comprises a humic acid salt. Methods of cementing using exemplary embodiments of the cement compositions are also provided.
Claims20
A well cement composition comprising:
- cement,
- water, and
- a fluid loss control additive comprising a graft copolymer, the graft copolymer comprising:
- a backbone comprising a humic acid salt,
- a first grafted monomer comprising at least one monomer selected from the group consisting of 2-acrylamido-2-methylpropanesulfonic acid, salts thereof and combinations thereof,
- a second grafted monomer comprising acrylamide,
- a third grafted monomer comprising at least one monomer selected from the group consisting of acrylic acid, salts thereof, and combinations thereof, and
- a fourth grafted monomer comprising diallyldimethylammonium chloride, and
- wherein the graft copolymer has a first grafted monomer-second grafted monomer-third grafted monomer-fourth grafted monomer mole ratio in the range of about 4:3:2:1 to about 4:1:0.5:0.1.
6 more elements
A well cement composition comprising:
- Portland cement,
- water, and
- silica,
- a high-temperature fluid loss control additive comprising a graft copolymer, the graft copolymer comprising:
- a backbone comprising a humic acid salt, wherein the backbone is present in the graft copolymer in an amount of about 10% to about 20% by weight of the graft copolymer on a dry basis,
- a first grafted monomer comprising at least one monomer selected from the group consisting of 2-acrylamido-2-methylpropanesulfonic acid, salts thereof and combinations thereof,
- a second grafted monomer comprising acrylamide,
- a third grafted monomer comprising at least one monomer selected from the group consisting of acrylic acid, salts thereof, and combinations thereof, and
- a fourth grafted monomer comprising diallyldimethylammonium chloride,
- wherein the graft copolymer comprises the first grafted monomer, the second grafted monomer, the third grafted monomer, and the fourth grafted monomer in an amount in the range of from about 80% to about 90% by weight of the graft copolymer on a dry basis, and
- wherein the graft copolymer has a first grafted monomer-second grafted monomer-third grafted monomer-fourth grafted monomer mole ratio in the range of about 4:3:2:1 to about 4:1:0.5:0.1.
8 more elements
A well cement composition comprising:
- Portland cement,
- water,
- a cement, set retarder,
- bentonite,
- crystalline silica,
- amorphous silica,
- an expanding additive, and
- a fluid loss control additive in an amount of about 0.1% to about 5% by weight of the Portland cement, wherein:
- the fluid loss control additive is suitable for use in wells having a bottom hole circulating temperature of at least about 500° F,
- the fluid loss control additive comprises a humic acid salt in an amount of about 10% to about 20% by weight of the fluid loss control additive on a dry basis, the humic acid salt is grafted with:
- a first grafted monomer comprising at least one monomer selected from the group consisting of 2-acrylamido-2-methylpropanesulfonic acid, salts thereof and combinations thereof,
- a second grafted monomer comprising acrylamide,
- a third grafted monomer comprising at least one monomer selected from the group consisting of acrylic acid, salts thereof, and combinations thereof, and
- a fourth grafted monomer comprising diallyldimethylammonium chloride,
- wherein the fluid loss control additive comprises the first grafted monomer, the second grafted monomer, the third grafted monomer, and the fourth grafted monomer in an amount in the range of from about 80% to about 90% by weight of the fluid loss control additive on a dry basis, and
- wherein the fluid loss control additive has a first grafted monomer-second grafted monomer-third grafted monomer-fourth grafted monomer mole ratio in the range of about 4:3:2:1 to about 4:1:0.5:0.1.
13 more elements
Dependencies are inferred from the claim text.