Methods and compositions for treating subterranean formations

A method of reducing the loss of adsorbable surface active additives from an aqueous treating solution utilized in the treatment of subterranean formations comprising the steps of:

• combining with said aqueous treating solution a chemical having the property of reducing the adsorption of said additives on material surfaces in said formation present in said composition in an amount in the range of from about 1% to about 90% by volume of said composition, said chemical having the general formula:
• C.sub.n H.sub.2n+1 (OC.sub.2 H.sub.4).sub.x R
• wherein:
• n has a value in the range of from about 4 to about 12;
• x has a value in the range of from about 1 to about 10;
• and
• R is a radical selected from the group consisting of --OCH.sub.3 and --NH.sub.2.

A composition for treating a subterranean formation comprising:

• an aqueous acid solution capable of dissolving mineral constituents contained in said formation;
• at least one additive having surface active properties present in said aqueous treating solution for imparting desired treating properties to said solution and to said formation to be treated;
• and
• a chemical having the property of reducing the adsorption of said additive on material surfaces present in said formation, said chemical being present in said composition in the range of from about 1% to about 90% by volume of said composition and having the general formula:
• C.sub.n H.sub.2n+1 R
• wherein:
• n has a value in the range of from about 4 to about 12;
• R is --OCH.sub.3.

A composition for treating a subterranean formation comprising:

• an aqueous acid solution capable of dissolving mineral constituents contained in said formation;
• at least one additive having surface active properties present in said aqueous treating solution for imparting desired treating properties to said solution and to said formation to be treated;
• and
• a chemical having the property of reducing the adsorption of said additive on material surfaces present in said formation, said chemical being present in said composition in the range of from about 1% to about 90% by volume of said composition wherein said chemical is selected from the group consisting of pentyl polyoxyethyl(3) methyl ether, pentyl polyoxyethyl(4) methyl ether, pentyl polyoxyethyl(5) methyl ether, isobutyl sulfate, pentyl sulfate, pentyl polyoxyethyl(3) sulfate and butoxy ethyl amine.

A composition for treating a subterranean formation to improve the permeability thereof comprising:

• water;
• an acid selected from the group consisting of hydrochloric acid, hydrofluoric acid, phosphoric acid, acetic acid, formic acid, and mixtures of two or more of said acids, said acid being present in said composition in an amount in the range of from about 1% to about 15% by weight of water and acid utilized;
• at least one additive having surface active properties for imparting desired treating properties to said acid solution and said formation present in said composition in an amount in the range of from about 0.1% to about 10.0% by volume of water and acid utilized;
• and
• a chemical having the property of reducing the adsorption of said additive on material surfaces in said formation present in said composition in an amount in the range of from about 1% to about 90% by volume of said composition, wherein said chemical is selected from the group consisting of pentyl polyoxyethyl(3) methyl ether, pentyl polyoxyethyl(4) methyl ether, pentyl polyoxyethyl(5) methyl ether, isobutyl sulfate, pentyl sulfate, pentyl polyoxyethyl(3) sulfate and butoxy ethyl amine.