US 11,753,583 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. 17/429,807
Filed by INNOSPEC LIMITED, Ellesmere Port (GB)
PCT Filed Feb. 11, 2020, PCT No. PCT/GB2020/050315
§ 371(c)(1), (2) Date Aug. 10, 2021,
PCT Pub. No. WO2020/165577, PCT Pub. Date Aug. 20, 2020.
Claims priority of application No. 1901930 (GB), filed on Feb. 12, 2019.
Prior Publication US 2022/0127522 A1, Apr. 28, 2022
This patent is subject to a terminal disclaimer.
Int. Cl. C09K 8/62 (2006.01); C09K 8/66 (2006.01); E21B 43/27 (2006.01); E21B 43/26 (2006.01); C06B 29/00 (2006.01); C06B 31/00 (2006.01); C09K 8/70 (2006.01)
CPC C09K 8/665 (2013.01) [C06B 29/00 (2013.01); C06B 31/00 (2013.01); C09K 8/703 (2013.01); E21B 43/2605 (2020.05); E21B 43/27 (2020.05)] 19 Claims
OG exemplary drawing
 
1. A method of treating a subterranean formation, the method comprising contacting the formation with:
(a) an ammonium compound;
(b) an oxidizing agent selected from a perchlorate or a nitrite or combinations thereof; and
(c) one or more acids, at least one of which is a bisulfate salt,
wherein said bisulfate salt is treated in the method to produce gas which supplements gas produced by reaction of said ammonium compound and said oxidizing agent, and
wherein, in the method, said ammonium compound and said oxidizing agent are contacted underground during passage towards or after arrival at a region of said subterranean formation it is desired to treat, wherein the gas produced includes nitrogen atoms originating in the bisulfate salt.