Salt of monochloroacetic acid with chelating agent for delayed acidification in the oil field industry
AssigneeNouryon Chemicals International B.V.
InventorsCornelis Elizabeth Johannus Van Lare, Maria Antonieta Leon Matheus, Jannes Schutte, Cornelis Kooijman
Life of this patent
Estimating the term…
Abstract
The disclosure is directed to a process for treating a subterranean earth formation by introducing a monovalent salt of monochloroacetic acid into said subterranean earth formation in the presence of a chelating agent which comprises at least one carboxylate group having a monovalent counterion and furthermore comprises a carbon chain carrying at least five hydroxyl groups. Preferably the cation of the monovalent salt of monochloroacetic acid is sodium.
Claims19
A process for treating a subterranean earth formation, said process comprising the step of introducing an aqueous acidizing treatment fluid into the subterranean earth formation wherein the fluid comprises:
- about 3 to about 20 weight percent of a sodium, potassium, and/or lithium salt of monochloroacetic acid based on a total weight of the fluid, and
- a chelating agent chosen from sodium gluconate, sodium glucoheptonate, and combinations thereof,
- wherein the chelating agent is present in a molar ratio of the salt to the chelating agent of from about 1:0.5 to about 1:10, and
- wherein the process is free of a step of independently adding monochloroacetic acid to the aqueous acidizing treatment.
A process for treating a subterranean earth formation, said process comprising the step of introducing an aqueous acidizing treatment fluid into a subterranean earth formation wherein the fluid comprises:
- about 5 to about 14 weight percent of a sodium salt of monochloroacetic acid based on a total weight of the fluid, and
- about 18 to about 21 weight percent of sodium gluconate based on a total weight of the fluid,
- and wherein the process is free of a step of independently adding monochloroacetic acid to the aqueous acidizing treatment.
A process for treating a subterranean earth formation, said process comprising the step of by introducing an aqueous acidizing treatment fluid into the subterranean earth formation wherein the fluid comprises:
- about 3 to about 20 weight percent of an ammonium salt of monochloroacetic acid based on a total weight of the fluid, and
- a chelating agent chosen from sodium gluconate, sodium glucoheptonate, and combinations thereof,
- wherein the chelating agent is present in a molar ratio of the ammonium salt to the chelating agent of from about 1:0.5 to about 1:10, and
- wherein the process is free of a step of independently adding monochloroacetic acid to the aqueous acidizing treatment.
Dependencies are inferred from the claim text.