	US 12,258,517 B2
	Method and material to reduce acid-carbonate reaction rate by endothermic reaction
Fakuen Frank Chang, Houston, TX (US); and Wenwen Li, Pearland, TX (US)
Assigned to SAUDI ARABIAN OIL COMPANY, Dhahran (SA)
Filed by ARAMCO SERVICES COMPANY, Houston, TX (US)
Filed on Nov. 28, 2023, as Appl. No. 18/521,781.
Application 18/521,781 is a division of application No. 17/660,738, filed on Apr. 26, 2022, granted, now 11,866,639.
Claims priority of provisional application 63/181,572, filed on Apr. 29, 2021.
Prior Publication US 2024/0093083 A1, Mar. 21, 2024
Int. Cl. C09K 8/528 (2006.01); C09K 8/36 (2006.01); C09K 8/536 (2006.01); C09K 8/92 (2006.01); C09K 23/18 (2022.01); C09K 23/52 (2022.01)

CPC C09K 8/528 (2013.01) [C09K 8/36 (2013.01); C09K 8/536 (2013.01); C09K 8/92 (2013.01); C09K 23/18 (2022.01); C09K 23/52 (2022.01)]

19 Claims

1. A method for reducing an acid carbonate reaction in a carbonate formation, the method comprising:

pumping a composition of solid particles into a formation, wherein the solid particles comprise one or more components selected from the group consisting of urea, ammonium nitrate, ammonium chloride, barium hydroxide, and ammonium thiocyanate, and wherein the solid particles are encapsulated in capsules or in an emulsion phase;

releasing the solid particles from the capsules or emulsion within the formation, initiating an endothermic reaction and cooling the formation; and

injecting an acid following the releasing step or during the pumping, wherein the acid carbonate reaction is carried out at a reduced reaction rate.