SCALE INHIBITOR FLUID AND METHOD FOR INHIBITING SCALE FORMATION
A scale inhibitor fluid includes 0.001 ppm to 100 ppm of a phosphonate compound, 20 ppm to 400 ppm of a cation-containing surfactant, and an aqueous fluid. The cation-containing surfactant includes at least one of a single positively charged cation-containing surfactant, a double positively charged cation-containing surfactant and a zwitterionic cation-containing surfactant. A method for inhibiting scale formation in a wellbore includes introducing a phosphonate compound, a cation-containing surfactant and an aqueous fluid to the wellbore to produce a scale inhibitor fluid.
1 . A scale inhibitor fluid comprising:
0.001 ppm to 100 ppm of a phosphonate compound;
20 ppm to 400 ppm of a cation-containing surfactant; and
an aqueous fluid,
wherein the cation-containing surfactant comprises at least one of a single positively charged cation-containing surfactant, a double positively charged cation-containing surfactant and a zwitterionic cation-containing surfactant.
2 . The scale inhibitor fluid of claim 1 , wherein the phosphonate compound is a nitrogen-containing phosphonate compound.
3 . The scale inhibitor fluid of claim 2 , wherein the nitrogen-containing phosphonate compound comprises at least one of amino trimethylene phosphonic acid (ATMP), diethylene triamine penta(methylene phosphonic acid) (DETPMP), bis(hexamethylene triamine penta(methylene phosphonic acid) (BHMT), and hydroxyethylamino-di(methylene phosphonic acid) (MEA).
4 . The scale inhibitor fluid of claim 1 , wherein the phosphonate compound comprises at least one of C—PO(OH) 2 group and C—PO(OR) 2 group, where R is alkyl or aryl group.
5 . The scale inhibitor fluid of claim 1 , wherein a scale inhibition increase % of the scale inhibitor fluid is at least 5% at a temperature of 105° C.
6 . The scale inhibitor fluid of claim 1 , wherein the cation-containing surfactant is the double positively charged cation-containing surfactant.
7 . The scale inhibitor fluid of claim 6 , wherein a scale inhibition increase % of the scale inhibitor fluid is at least 24% at a temperature of 105° C.
8 . The scale inhibitor fluid of claim 1 ,
wherein the cation-containing surfactant is the zwitterionic cation-containing surfactant, and
wherein a concentration of the cation-containing surfactant in the scale inhibitor fluid ranges from 40 ppm to 400 ppm.
9 . The scale inhibitor fluid of claim 8 , wherein a scale inhibition increase % of the scale inhibitor fluid is at least 30% at a temperature of 105° C.
10 . A method for inhibiting scale formation in a wellbore, the method comprising:
introducing a phosphonate compound, a cation-containing surfactant and an aqueous fluid to the wellbore to produce a scale inhibitor fluid; wherein:
a concentration of the phosphonate compound in the scale inhibitor fluid ranges from 0.001 ppm to 100 ppm,
a concentration of the cation-containing surfactant in the scale inhibitor fluid ranges from 20 ppm to 400 ppm, and
the cation-containing surfactant comprises at least one of a single positively charged cation-containing surfactant, a double positively charged cation-containing surfactant and a zwitterionic cation-containing surfactant.
11 . The method of claim 10 , wherein the phosphonate compound comprises a nitrogen-containing phosphonate compound.
12 . The method of claim 11 , wherein the nitrogen-containing phosphonate compound comprises at least one of amino trimethylene phosphonic acid (ATMP), diethylene triamine penta(methylene phosphonic acid) (DETPMP), bis(hexamethylene triamine penta(methylene phosphonic acid) (BHMT), and hydroxyethylamino-di(methylene phosphonic acid) (MEA).
13 . The method of claim 10 , wherein the phosphonate compound comprises at least one of C—PO(OH) 2 group and C—PO(OR) 2 group, where R is alkyl or aryl group.
14 . The method of claim 10 , wherein a scale inhibition increase % of the scale inhibitor fluid is at least 5% at a temperature of 105° C.
15 . The method of claim 10 , wherein the cation-containing surfactant is the double positively charged cation-containing surfactant.
16 . The method of claim 15 , wherein a scale inhibition increase % of the scale inhibitor fluid is at least 24% at a temperature of 105° C.
17 . The method of claim 10 ,
wherein the cation-containing surfactant is the zwitterionic cation-containing surfactant, and
wherein the concentration of the cation-containing surfactant in the scale inhibitor fluid is in a range of 40 ppm to 400 ppm.
18 . The method of claim 17 , wherein a scale inhibition increase % of the scale inhibitor fluid is at least 30% at a temperature of 105° C.