Copolymer based on olefinic sulphonic acids

A method of providing water retention by adding a sufficient amount of a copolymer to a drilling fluid to provide water retention or to improve water retention properties of said drilling fluid, wherein the copolymer comprises an olefinic sulfonic acid of formula (Ia) or (Ib)

• wherein
• R1 is hydrogen or C1-C5-alkyl;
• R2 is C1-C20-alkylene, carboxy-C1-C20-alkylene, carboamido-C1-C20-alkylene or phenylene;
• M is hydrogen, ammonium or a monovalent, divalent or trivalent metal cation;
• and
• x is from 1 to 3 as monomer component a), and
• a reactive component b) that is an organosilicone-containing compound of formula (II)
• (R3O)y—Si—R4z (II)
• wherein
• R3 is H, C1-C20-alkyl, C1-C20-alkenyl, C1-C20-alkynyl, aryl, alkylpolysiloxane oligomer or mixtures thereof;
• R4 is vinyl, allyl, (meth)acryloyl, C1-C8-hydroxyalkyl, C1-C8-aminoalkyl, C1-C8-alkylglycidyl, C1-C8-isocyanato or mixtures thereof;
• y is from 1 to 3;
• and
• z is 4-y.

A method comprising drilling for oil with a drilling fluid that comprises an additive, wherein the additive is a copolymer comprising an olefinic sulfonic acid of formula (Ia) or (Ib)

• wherein
• R1 is hydrogen or C1-C5-alkyl;
• R2 is C1-C20-alkylene, carboxy-C1-C20-alkylene, carboamido-C1-C20-alkylene or phenylene;
• M is hydrogen, ammonium or a monovalent, divalent or trivalent metal cation;
• and
• x is from 1 to 3 as monomer component a), and
• a reactive component b) that is an organosilicone-containing compound of formula (II)
• (R30)y—Si—R4z (II)
• wherein
• R3 is H, C1-C20-alkyl, C1-C20-alkenyl, C1-C20-alkynyl, aryl, alkylpolysiloxane oligomer or mixtures thereof;
• R4 is vinyl, allyl, (meth)acryloyl, C1-C8-hydroxyalkyl, C1-C8-aminoalkyl, C1-C8-alkylglycidyl, C1-C8-isocyanato or mixtures thereof;
• y is from 1 to 3;
• and
• z is 4-y.

A method comprising cementing an oil well with a cementing composition that comprises an additive, wherein the additive is a copolymer comprising an olefinic sulfonic acid of formula (Ia) or (Ib)

• wherein
• R1 is hydrogen or C1-C5-alkyl;
• R2 is C1-C20-alkylene, carboxy-C1-C20-alkylene, carboamido-C1-C20-alkylene or phenylene;
• M is hydrogen, ammonium or a monovalent, divalent or trivalent metal cation;
• and
• x is from 1 to 3 as monomer component a), and
• a reactive component b) that is an organosilicone-containing compound of formula (II)
• (R3O)y—Si—R4z (II)
• wherein
• R3 is H, C1-C20-alkyl, C1-C20-alkenyl, C1-C20-alkynyl, aryl, alkylpolysiloxane oligomer or mixtures thereof;
• R4 is vinyl, allyl, (meth)acryloyl, C1-C8-hydroxyalkyl, C1-C8-aminoalkyl, C1-C8-alkylglycidyl, C1-C8-isocyanato or mixtures thereof;
• y is from 1 to 3;
• and
• z is 4-y.