Stabilization of polyacrylamide emulsion formulations
View Patent ↗The current invention provides a method to form a stable blend of polyacrylamide water-in-oil emulsion and breaker surfactants such as silicon polyether copolymer and linear or branched alcohol ethoxylate surfactants. The composition can be employed, for example, as a friction reducing additive for water based fracturing fluid, or a drilling mud additive.
1. A method of stabilizing a friction reducer composition comprising
(a) polyacrylamide emulsion; and,
(b) breaker surfactant selected from the group consisting of
(1) silicone polyether(s) defined by the formula:
Me 3 Si—O—SiMe(R)—O—SiMe 3 ,
wherein
R═(C 3 H 6 )O(C 2 H 4 O) a (C 3 H 6 O) b (C 4 H 8 O) c Z,
wherein
a=4-17,
b=0-26,
c=0-26, and
Z is H, acetyl or a monovalent hydrocarbon group containing from 1 to 12 carbon atoms;
(2) silicone polyether(s) defined by the formula:
Me 3 Si—[OSiMe 2 ] x —[O—SiMe(R)] y —O—SiMe 3 ,
wherein
x=0-74,
y=1-10,
R═(C 3 H 6 )O(C 2 H 4 O) a (C 3 H 6 O) b (C 4 H 8 O) c Z,
a=5-17,
b=0-26,
c=0-26, and
Z is H, acetyl or a monovalent hydrocarbon group containing from 1 to 12 carbon atoms; and,
(3) silicon polyether(s) defined by the formula:
Me 3 Si(C 2 H 4 )SiMe 2 (C 3 H 6 O)(C 2 H 4 O) x Z,
wherein
x=3-17, and Z is H, acetyl or a monovalent hydrocarbon group containing from 1 to 12 carbon atoms
said method comprising adding an effective amount of an organic additive with the formula R—O—R′, where
R is a monovalent, linear or branched, saturated or unsaturated hydrocarbon with 1-200 carbon atoms, and
R′ is a monovalent, linear or branched, saturated or unsaturated hydrocarbon with 1-70 carbon atoms and optionally containing at least one of oxygen, nitrogen and sulphur heteroatoms, to the friction reducer composition, thereby stabilizing said friction reducer composition.
2. The method of claim 1 wherein said emulsion is water-in-oil emulsion.
3. The method of claim 1 wherein said polyacrylamide is an anionic polyacrylamide.
4. The method of claim 1 wherein
R is a monovalent, linear or branched, saturated or unsaturated hydrocarbon with 1-100 carbon atoms, and
R′ is a monovalent, linear or branched, saturated or unsaturated hydrocarbon with 1-40 carbon atoms and optionally contains oxygen atoms.
5. The method of claim 4 wherein
R′ is a monovalent, linear or branched, saturated or unsaturated hydrocarbon with 1-40 carbon atoms and optionally contains oxygen atoms.
6. The method of claim 5 wherein
R′ is —C(O)R″ wherein R″ is a monovalent, linear or branched, saturated or unsaturated hydrocarbon with 1-40 carbon atoms.
7. The method of claim 1 wherein said organic additive is a fatty acid ester.
8. The method of claim 1 wherein said organic additive is 1 wt % to 6 wt % of the formulation.
9. The method of claim 1 wherein the said breaker surfactant is 1 wt % to 6 wt % of the friction reducer composition.
10. The method of claim 1 wherein said stabilized friction reducer composition is added to water and/or brine at a dosage rate of from 0.25 to 5 gallons to 1,000 gallons of water or brine.
11. A hydraulic fracturing operation utilizing the stabilized friction reducer composition produced by the method of claim 1 .
12. A drilling operation utilizing the stabilized friction reducer composition produced by the method of claim 1 .
13. A coil tubing operation utilizing the stabilized friction reducer composition produced by the method of claim 1 .
14. An acidizing operation utilizing the stabilized friction reducer composition produced by the method of claim 1 .
15. A stabilized friction reducer composition comprising
a. a polyacrylamide emulsion;
b. a breaker surfactant selected from the group consisting of
(1) silicone polether(s) defined by the formula:
Me 3 Si—O—SiMe(R)—O—SiMe 3 ,
wherein
R═(C 3 H 6 )O(C 2 H 4 O) a (C 3 H 6 O) b (C 4 H 8 O) c Z,
wherein
a=4-17,
b=0-26,
c=0-26, and
Z is H, acetyl or a monovalent hydrocarbon group containing from 1 to 12 carbon atoms:
(2) silicone polyether(s) defined by the formula:
Me 3 Si—[OSiMe 2 ] x —[O—SiMe(R)] y —O—SiMe 3 ,
wherein
x=0-74,
y=1-10,
R═(C 3 H 6 )O(C 2 H 4 O) a (C 3 H 6 O) b (C 4 H 8 O) c Z,
a=5-17,
b=0-26,
c=0-26, and
Z is H, acetyl or a monovalent hydrocarbon group containing from 1 to 12 carbon atoms; and,
and
(3) silicon polyether(s) defined by the formula:
Me 3 Si(C 2 H 4 )SiMe 2 (C 3 H 6 O)(C 2 H 4 O) x Z,
wherein
x=3-17, and Z is H, acetyl or a monovalent hydrocarbon group containing from 1 to 12 carbon atoms; and,
c. an organic additive with the formula R—O—R′, where R is a monovalent, linear or branched, saturated or unsaturated hydrocarbon with 1-200 carbon atoms, and R′ is a monovalent, linear or branched, saturated or unsaturated hydrocarbon with 1-70 carbon atoms and optionally containing at least one of oxygen, nitrogen and sulphur heteroatoms, and wherein the organic additive is present in an amount suitable to provide a stabilized friction reducer composition.
16. The stabilized friction reducer composition of claim 15 wherein
R is a monovalent, linear or branched, saturated or unsaturated hydrocarbon with 1-100 carbon atoms, and
R′ is a monovalent, linear or branched, saturated or unsaturated hydrocarbon with 1-40 carbon atoms and optionally containing at least one oxygen atom.
17. The stabilized friction reducer composition of claim 16 wherein R′ is a monovalent, linear or branched, saturated or unsaturated hydrocarbon with 1-40 carbon atoms and optionally contains at least one oxygen atom.
18. The stabilized friction reducer composition of claim 17 wherein R′ is —C(O)R″ wherein R″ is a monovalent, linear or branched, saturated or unsaturated hydrocarbon with 1-40 carbon atoms.
19. The stabilized friction reducer composition of claim 15 wherein said organic additive is a fatty acid ester.
20. The stabilized friction reducer composition of claim 15 wherein said organic additive is 1 wt % to 6 wt % of the formulation.