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US 8,770,296 B2Granted
High density breaker fluids and methods of use thereof
AssigneeM-I L.L.C.
InventorsRaul Navarro-mascarell, Mark Luyster
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Abstract
A wellbore fluid that includes an aqueous base fluid; a chelating agent; and at least one enzyme, wherein the wellbore fluid has a pH of at least 6.5 is disclosed.
Claims17
A wellbore fluid, comprising:
- an aqueous base fluid;
- a chelating agent, wherein the chelating agent comprises K3EDTA;
- and
- at least one enzyme,
- wherein the wellbore fluid has a pH of at least 7.5.
2 more elements
A method of cleaning a wellbore drilled with a wellbore fluid that forms a filter cake, the method comprising:
- emplacing a breaker fluid into the wellbore, the breaker fluid comprising:
- an aqueous fluid;
- a chelating agent, wherein the chelating agent comprises K3EDTA;
- and
- at least one enzyme, wherein the wellbore fluid has a pH of at least 7.5;
- and
- shutting in the well for a period of time sufficient to initiate breaking of the filter cake.
4 more elements
A wellbore fluid, comprising:
- an aqueous base fluid;
- a chelating agent, wherein the chelating agent is K3EDTA;
- and
- at least one enzyme,
- wherein the wellbore fluid has a pH of at least 6.5.
2 more elements
Dependencies are inferred from the claim text.