Method of inhibiting or controlling formation of inorganic scales
First Claim
1. A method of stimulating a subterranean formation by pumping into the formation, in a single treatment step, a fracturing or acidizing fluid comprising a composite of a liquid scale inhibitor adsorbed onto a water-insoluble adsorbent wherein the scale inhibitor inhibits or controls the formation of inorganic scales by slowly releasing the scale inhibitor into the formation, wherein the surface area of the adsorbent is between from about 1 m2/g to about 100 m2/g, the weight ratio of scale inhibitor to adsorbent in the composite is between from about 9:
- 1 to about 1;
9 and the lifetime of the composite introduced in the single treatment step is least six months.
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Abstract
A well treating composition of a composite containing a scale inhibitor adsorbed onto a water-insoluble adsorbent is useful in the control, formation and treatment of inorganic scales in a subterranean formation or wellbore. In addition, the well treating composition is useful in controlling the rate of release of scale inhibitor in the wellbore. The water-insoluble adsorbent may be activated carbon, silica particulate, precipitated silica, zeolite, diatomaceous earth, ground walnut shells, fuller'"'"'s earth and organic synthetic high molecular weight water-insoluble adsorbents. The composite may be introduced into an oil or gas well with a carrier fluid.
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Citations
21 Claims
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1. A method of stimulating a subterranean formation by pumping into the formation, in a single treatment step, a fracturing or acidizing fluid comprising a composite of a liquid scale inhibitor adsorbed onto a water-insoluble adsorbent wherein the scale inhibitor inhibits or controls the formation of inorganic scales by slowly releasing the scale inhibitor into the formation, wherein the surface area of the adsorbent is between from about 1 m2/g to about 100 m2/g, the weight ratio of scale inhibitor to adsorbent in the composite is between from about 9:
- 1 to about 1;
9 and the lifetime of the composite introduced in the single treatment step is least six months. - View Dependent Claims (2, 3, 4, 5, 6, 7)
- 1 to about 1;
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8. A method of controlling the rate of release of a scale inhibitor in a wellbore comprising introducing into the wellbore a well treating composition comprising a composite of a liquid scale inhibitor adsorbed onto a water-insoluble adsorbent having a surface area of from about 1 m2/g to about 100 m2/g and wherein the weight ratio of scale inhibitor to adsorbent in the composite is between from about 9:
- 1 to about 1;
9 and further wherein the composite has a lifetime, from a single treatment, of at least six months. - View Dependent Claims (9, 10, 11, 12, 13, 14, 15)
- 1 to about 1;
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16. In a method of inhibiting or controlling inorganic scale formations in a subterranean formation or in a wellbore by introducing into the subterranean formation or wellbore a scale inhibitor, the improvement comprising controlling the rate of release of the scale inhibitor by introducing into the subterranean formation or wellbore a composite of a scale inhibitor adsorbed onto a water-insoluble adsorbent, wherein the adsorbent has a surface area of from about 1 m2/g to about 100 m2/g and further wherein the weight ratio of scale inhibitor to adsorbent in the composite is between from about 9:
- 1 to about 1;
9, the composite having a lifetime, from a single treatment, of at least six months. - View Dependent Claims (17, 18, 19, 20, 21)
- 1 to about 1;
Specification