US 11,912,937 B2
Acidizing treatment fluid for delayed acidification in the oil field industry
Willem Koelewijn, Deventer (NL); Maria Antonieta Leon Matheus, Epse (NL); Cornelis Kooijman, Deventer (NL); and Cornelis Elizabeth Johannus Van Lare, Wijchen (NL)
Assigned to NOURYON CHEMICALS INTERNATIONAL B.V., Amsterdam (NL)
Appl. No. 17/999,238
Filed by NOURYON CHEMICALS INTERNATIONAL B.V., Amsterdam (NL)
PCT Filed May 19, 2021, PCT No. PCT/EP2021/063291
§ 371(c)(1), (2) Date Nov. 18, 2022,
PCT Pub. No. WO2021/233999, PCT Pub. Date Nov. 25, 2021.
Claims priority of application No. 20175675 (EP), filed on May 20, 2020; application No. 20175679 (EP), filed on May 20, 2020; and application No. 20181769 (EP), filed on Jun. 23, 2020.
Prior Publication US 2023/0220271 A1, Jul. 13, 2023
Int. Cl. C09K 8/74 (2006.01); E21B 43/27 (2006.01); C09K 8/524 (2006.01)
CPC C09K 8/74 (2013.01) [C09K 8/524 (2013.01); E21B 43/27 (2020.05)] 18 Claims
 
1. A process for treating a subterranean earth formation by introducing an acidizing treatment fluid comprising a monovalent salt of monochloroacetic acid into said subterranean earth formation in the presence of at least one iodide salt, wherein the at least one iodide salt is introduced into the subterranean earth formation in an amount of from about 0.3 to about 10 wt%, based on the total weight of the acidizing treatment fluid wherein an element to suppress precipitation of calcium glycolate is also introduced into the subterranean earth formation in an amount of from about 0.005 to about 40 wt%, based on the total weight of the acidizing treatment fluid.