Breaker additives for extended delay in removal of oil-based filter cakes
The present disclosure provides methods, compositions, and systems directed to filter cake removal embodying a delayed breaker fluid for oil-based drill-in fluids. A wellbore treatment method comprising: introducing a delayed breaker fluid into a wellbore, wherein the delayed breaker fluid comprises an aqueous base fluid, an acid precursor, and a carbodiimide; and contacting a filter cake in the wellbore with the delayed breaker fluid such that the filter cake is at least partially degraded by acid released from the acid precursor.
1. A wellbore treatment method comprising:
introducing a delayed breaker fluid into a wellbore, wherein the delayed breaker fluid comprises an aqueous base fluid, an acid precursor, and a carbodiimide, wherein the carbodiimide is present in an amount of about 1 to about 3 pounds per barrel of the delayed breaker fluid; and
contacting an oil-based filter cake in the wellbore with the delayed breaker fluid such that the oil-based filter cake is at least partially degraded by acid released from the acid precursor.
2. The method of claim 1 , wherein the delayed breaker fluid further comprises a wetting-agent.
3. The method of claim 2 , wherein the wetting-agent comprises a surfactant.
4. The method of claim 2 , wherein the wetting-agent is present in an amount of about 0.02% to about 4% by volume of the delayed breaker fluid.
5. The method of claim 1 , wherein the delayed breaker fluid is essentially free of polymeric viscosifiers.
6. The method of claim 1 , wherein the carbodiimide comprises at least one carbodiimide selected from the group consisting of a carbodiimide monomer, a polycarbodiimide, and combinations thereof.
7. The method of claim 1 , wherein the carbodiimide comprises at least one carbodiimide monomer selected from the group consisting of dialkyl-,diaryl-, diallyl-carbodiimides, 1-ethyl-3-(3-dimethylaminopropyl)carbodiimide (EDCI), N,N′-dicyclohexylcarbodiimide (DCC), N,N′-diisopropylcarbodiimide (DIC), and bis(2,6-diisopropylphenyl)carbodiimide, and combinations thereof.
8. The method of claim 1 , wherein the aqueous base fluid comprises at least one fluid selected from the group consisting of fresh water, saltwater, seawater, and combinations thereof.
9. The method of claim 1 , wherein the aqueous base fluid is present in an amount of about 50% to about 99% by volume of the delayed breaker fluid.
10. The method of claim 1 , wherein the acid precursor is present in an amount of about 5% to about 25% by volume of the delayed breaker fluid.
11. The method of claim 1 , wherein the acid precursor comprises an ester-based acid precursor.
12. A wellbore treatment method comprising:
introducing a delayed breaker fluid into a wellbore, wherein the delayed breaker fluid comprises a brine; an ester-based breaker; a carbodiimide, wherein the carbodiimide is present in an amount of about 1 to about 3 pounds per barrel of the delayed breaker fluid; and a wetting agent;
contacting an oil-based filter cake in the wellbore with the delayed breaker fluid; and
degrading the oil-based filter cake with acid released from the ester-based breaker.
13. The method of claim 12 , wherein the delayed breaker fluid is essentially free of polymeric viscosifiers.
14. The method of claim 12 , wherein the ester-based breaker is present in an amount of about 5% to about 25% by volume of the delayed breaker fluid.
15. The method of claim 12 , wherein the carbodiimide comprises at least one carbodiimide selected from the group consisting of a carbodiimide monomer, a polycarbodiimide, and combinations thereof.
16. The method of claim 12 , wherein the carbodiimide comprises at least one carbodiimide monomer selected from the group consisting of dialkyl-,diaryl-, diallyl-carbodiimides, 1-ethyl-3-(3-dimethylaminopropyl)carbodiimide (EDCI), N,N′-dicyclohexylcarbodiimide (DCC), N,N′-diisopropylcarbodiimide (DIC), and bis(2,6-diisopropylphenyl)carbodiimide, and combinations thereof.
17. The method of claim 12 , wherein the wetting-agent is present in an amount of about 0.02% to about 4% by volume of the delayed breaker fluid.
18. The method of claim 12 , wherein the aqueous base fluid is present in an amount of about 50% to about 99% by volume of the delayed breaker fluid.