Well treating compositions for slow release of treatment agents and methods of using the same
First Claim
1. A method of stimulating a subterranean formation which comprises pumping into the formation, in a single step, a fracturing or acidizing fluid comprising a composite of a well treatment agent adsorbed onto a water-insoluble adsorbent wherein the well treatment agent is dissolved at a generally constant rate over an extended period of time in the water which is contained in 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 the well treatment agent 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 at least six months.
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Accused Products
Abstract
A composite of a well treatment agent adsorbed onto a water-insoluble adsorbent is useful in the treatment of oil and gas wells and may be introduced, as a well treatment fluid, with a carrier fluid. 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. Suitable as the well treatment agent are scale inhibitors, corrosion inhibitors, paraffin inhibitors, salt inhibitors, gas hydrate inhibitors, asphaltene inhibitors, oxygen scavengers, biocides, foaming agent, emulsion breakers and surfactants.
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Citations
15 Claims
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1. A method of stimulating a subterranean formation which comprises pumping into the formation, in a single step, a fracturing or acidizing fluid comprising a composite of a well treatment agent adsorbed onto a water-insoluble adsorbent wherein the well treatment agent is dissolved at a generally constant rate over an extended period of time in the water which is contained in 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 the well treatment agent 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 at 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 well treatment agent in a wellbore comprising introducing into the welibore a well treating composition comprising a composite of a well treatment agent adsorbed onto a water-insoluble adsorbent having a surface area of from about 1 m2/g to about 100 m2/g, wherein the weight ratio of well treatment agent 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)
- 1 to about 1;
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14. A method of inhibiting or controlling the rate of release of a well treatment agent in a subterranean formation or in a weilbore by introducing into the formation or wellbore a composite of a well treatment agent 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 well treatment agent 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 (15)
- 1 to about 1;
Specification