COMPOSITIONS FOR STIMULATION OPERATIONS
Compositions for stimulating a subterranean formation may include 10 wt % to 25 wt % of an oleaginous liquid; 5 wt % to 50 wt % of a fatty alkyl alcohol ethoxylate; 15 wt % to 75 wt % of at least one of a fatty alkyl ethoxylated ammonium salt, a zwitterionic surfactant, an alkyl ether sulfate salt or an alkyl ether sulfonate salt; and 5 wt % to 40 wt % of a co-solvent, each wt % being based on a total mass of the composition, excluding aqueous fluids. The compositions may be combined with an aqueous fluid, optionally to form foams or emulsions.
1 . A composition comprising:
1 wt % to 15 wt % of an oleaginous liquid;
5 wt % to 30 wt % of a fatty alkyl alcohol ethoxylate;
wherein a fatty alcohol of the fatty alkyl alcohol ethoxylate comprises a secondary alcohol;
2 wt % to 30 wt % of at least one of a fatty alkyl ethoxylated ammonium salt, a zwitterionic surfactant, an alkyl ether sulfate salt or an alkyl ether sulfonate salt; and
4 wt % to 30 wt % of a co-solvent, each wt % being based on a total mass of an aqueous fluid.
2 . The composition of claim 1 , wherein the oleaginous liquid comprises a terpene, a hydrocarbon, a fatty acid ester, or any combination thereof.
3 . The composition of claim 1 , wherein the fatty alkyl alcohol ethoxylate comprises a linear or branched C 6 -C 18 alcohol ethoxylate comprising 3 to 30 ethoxylate repeat units.
4 . The composition of claim 1 , wherein the fatty alkyl ethoxylated ammonium salt is present and comprises at least one functionalized alkyl group having 3 to 30 ethoxylate repeat units.
5 . The composition of claim 1 , wherein the zwitterionic surfactant is present and comprises a C 12 -C 18 betaine, a C 12 -C 18 sultaine, or any combination thereof.
6 . The composition of claim 1 , wherein the alkyl ether sulfate salt or the alkyl ether sulfonate salt is present and comprises an ammonium salt.
7 . The composition of claim 1 , wherein the co-solvent comprises an alcohol, a glycol, a glycol ether, a glycol ester, or any combination thereof.
8 . (canceled)
9 . (canceled)
10 . The composition of claim 8 , wherein the composition is emulsified to form an emulsion.
11 . The composition of claim 10 , wherein the emulsion has a particle size of 50 nm to 5000 nm.
12 . The composition of claim 8 , wherein the aqueous fluid comprises an aqueous acid selected from the group consisting of a mineral acid, an organic acid, and any combination thereof.
13 . The composition of claim 8 , wherein the composition exhibits a surface tension of 31 mN/m or less, as measured relative to air.
14 . A method comprising:
providing a treatment fluid comprising:
an aqueous fluid comprising an aqueous acid selected from the group consisting of a mineral acid, an organic acid, and any combination thereof;
1 wt % to 15 wt % of an oleaginous liquid;
5 wt % to 30 wt % of a fatty alkyl alcohol ethoxylate;
wherein a fatty alcohol of the fatty alkyl alcohol ethoxylate comprises a secondary alcohol;
2 wt % to 30 wt % of at least one of a fatty alkyl ethoxylated ammonium salt, a zwitterionic surfactant, an alkyl ether sulfate salt or an alkyl ether sulfonate salt; and
4 wt % to 30 wt % of a co-solvent, each wt % being based on a total mass of an aqueous fluid; and
introducing the treatment fluid into a subterranean formation during a stimulation operation.
15 . The method of claim 14 , wherein the stimulation operation comprises matrix acidizing or acid fracturing.
16 . The method of claim 14 , wherein the subterranean formation comprises a carbonate reservoir.
17 . The method of claim 14 , wherein a recovery of the treatment fluid or a spent variant of the treatment fluid from the subterranean formation is 50% or greater after a shut in period in the subterranean formation.
18 . The method of claim 14 , wherein the oleaginous liquid comprises a terpene, a hydrocarbon, a fatty acid ester, or any combination thereof.
19 . The method of claim 14 , wherein the fatty alkyl alcohol ethoxylate comprises a linear or branched C 6 -C 18 alcohol ethoxylate comprising 3 to 30 ethoxylate repeat units.
20 . The method of claim 14 , wherein the fatty alkyl ethoxylated ammonium salt is present and comprises at least one functionalized alkyl group having 3 to 30 ethoxylate repeat units.
21 . The method of claim 14 , wherein the zwitterionic surfactant is present and comprises a C 12 -C 18 betaine, a C 12 -C 18 sultaine, or any combination thereof.
22 . The method of claim 14 , wherein the alkyl ether sulfate salt or the alkyl ether sulfonate salt is present and comprises an ammonium salt.
23 . The method of claim 14 , wherein the co-solvent comprises an alcohol, a glycol, a glycol ether, a glycol ester, or any combination thereof.
24 . The method of claim 14 , wherein the treatment fluid comprises 25 wt % to 85 wt % of the aqueous fluid, based on the total mass of the treatment fluid, including the aqueous fluid.
25 . The method of claim 14 , wherein the treatment fluid is emulsified or foamed.