US 11,987,751 B2
Treatment of subterranean formations
Ian Malcolm McRobbie, Ellesmere Port (GB); and William Trenholme, Ellesmere Port (GB)
Assigned to INNOSPEC LIMITED, Ellesmere Port (GB)
Appl. No. 17/429,795
Filed by INNOSPEC LIMITED, Ellesmere Port (GB)
PCT Filed Feb. 11, 2020, PCT No. PCT/GB2020/050314
§ 371(c)(1), (2) Date Aug. 10, 2021,
PCT Pub. No. WO2020/165576, PCT Pub. Date Aug. 20, 2020.
Claims priority of application No. 1901928 (GB), filed on Feb. 12, 2019.
Prior Publication US 2022/0127521 A1, Apr. 28, 2022
This patent is subject to a terminal disclaimer.
Int. Cl. C09K 8/66 (2006.01); C06B 29/00 (2006.01); C06B 31/02 (2006.01); E21B 43/24 (2006.01); E21B 43/26 (2006.01); E21B 43/27 (2006.01); E21B 31/00 (2006.01)
CPC C09K 8/665 (2013.01) [C06B 29/00 (2013.01); C06B 31/02 (2013.01); E21B 43/2405 (2013.01); E21B 43/2605 (2020.05); E21B 43/27 (2020.05); E21B 31/00 (2013.01)] 22 Claims
OG exemplary drawing
 
1. A method of treating a subterranean formation, the method comprising:
(a) introducing an ammonium compound into the formation;
(b) introducing an oxidizing agent into the formation, wherein said oxidizing agent is selected from a perchlorate and a nitrite or combinations thereof;
(c) introducing sulfamic acid as a solution or slurry in water into the formation; and
(d) contacting the formation with said ammonium compound, said oxidizing agent and said sulfamic acid;
wherein said ammonium compound reacts with said oxidizing agent and/or said sulfamic acid to generate a gas in the formation;
wherein said sulfamic acid reacts to produce a gas, wherein the gas produced includes nitrogen atoms originating in the sulfamic acid; and
wherein a ratio (B) defined as the number of moles of ammonium compound divided by the total number of moles of sulfamic acid contacted with the formation is greater than 0 and is 10 or less.