Esterquat acidic subterranean treatment fluids and methods of using esterquats acidic subterranean treatment fluids
The present invention relates to acidic treatment fluids that comprise an acid fluid and an ester-containing quaternary ammonium compound (“esterquat”) and methods of their use. One embodiment of the present invention provides a method of inhibiting metal corrosion during a subterranean treatment operation comprising using an acidic treatment fluid comprising an acidic fluid and an esterquat. Another embodiment of the present invention provides a method of reducing sludge formation during a subterranean treatment operation formation comprising the step of using an acidic treatment fluid comprising an acidic fluid and an esterquat. Another embodiment of the present invention provides a method of inhibiting the formation of emulsions during a subterranean treatment operation comprising using an acidic treatment fluid comprising an acidic fluid and an esterquat. Another embodiment of the present invention provides an acidic subterranean treatment fluid comprising an acidic fluid and an esterquat.
1. An acidic subterranean treatment fluid comprising an acidic fluid and an esterquat
wherein the esterquat comprises a reverse esterquat having the general formula:
{R (4-m) N + —[(CH 2 ) n —C(O)—O} p —R′] m pX − , wherein
R represents a linear or branched chain saturated or unsaturated aliphatic hydrocarbon, aryl, arylalkyl, alkyl amide, hydroxy alkyl, or a mixture thereof, wherein (when there is more than one R group) they may be the same as one another or each may be different from one another;
m is an integer in the range from 1 to 3;
p is an integer of at least 1;
R′ represents a linear or branched chain saturated or unsaturated aliphatic hydrocarbon, aryl, arylalkyl, alkyl amide, or a mixture thereof;
n is an integer in the range from 1 to 6; and,
X − represents an anionic counter ion, examples of which include, but are not limited to, a halide, sulfate, methosulfate, or methophosphate, and wherein the subterranean treatment fluid has a pH of less than about 4 and further comprises crude oil.
2. The acidic subterranean treatment fluid of claim 1 wherein the esterquat is present in the acidic treatment fluid in an amount of about 5% or below based on the total volume of the acidic fluid.
3. The acidic subterranean treatment fluid of claim 1 wherein R further comprises a substituent group comprising an aryl group, an alkoxy group, a hydroxyl group, an aryloxy group, an amido group, or a combination thereof.
4. The acidic subterranean treatment fluid of claim 1 wherein R′ further comprises a substituent group comprising a hydroxyl group, a carbonyl group, an amido group, an aryl group, a sulfur, or a combination thereof.
5. The acidic subterranean treatment fluid of claim 1 wherein the acidic fluid comprises hydrochloric acid, hydrofluoric acid, acetic acid, formic acid, hydroxyfluoboric acid, citric acid, EDTA, or a combination thereof.
6. The acidic subterranean treatment fluid of claim 1 wherein the acidic treatment fluid further comprises a surfactant.
7. The acidic subterranean treatment fluid of claim 6 wherein the acidic treatment fluid comprises a surfactant in an amount from about 1% of the volume of the esterquat to about 100% of the volume of the esterquat.
8. The acidic subterranean treatment fluid of claim 6 wherein the surfactant is a non-ionic surfactant comprising an alkyoxylate, an alkylphenol, an ethoxylated alkyl amine, an ethoxylated oleate, a tall oil, an ethoxylated fatty acid, or a combination thereof.
9. The acidic subterranean treatment fluid of claim 6 wherein the surfactant is a cationic surfactant comprising an alkylamine oxide, an alkylammonium salt, or a combination thereof.
10. The acidic subterranean treatment fluid of claim 6 wherein the surfactant is an anionic surfactant comprising an α-sulfonated ester, an alkylbenzenesulfonate, or a combination thereof.
11. The acidic subterranean treatment fluid of claim 1 wherein the acidic treatment fluid further comprises a solvent.
12. The acidic subterranean treatment fluid of claim 11 wherein the acidic treatment fluid comprises a solvent in an amount from about 1% of the volume of the esterquat to about 100% of the volume of the esterquat.
13. The acidic subterranean treatment fluid of claim 1 wherein the esterquat included in the acidic treatment fluid has a physical form comprising a liquid.