US 11,781,413 B2
Downhole acid injection to stimulate formation production
Anthony Herman van Zuilekom, Houston, TX (US); Christopher Michael Jones, Katy, TX (US); and Darren George Gascooke, Houston, TX (US)
Assigned to Halliburton Energy Services, Inc., Houston, TX (US)
Filed by Halliburton Energy Services, Inc., Houston, TX (US)
Filed on Dec. 4, 2020, as Appl. No. 17/112,491.
Claims priority of provisional application 62/969,734, filed on Feb. 4, 2020.
Prior Publication US 2021/0238974 A1, Aug. 5, 2021
This patent is subject to a terminal disclaimer.
Int. Cl. E21B 43/27 (2006.01); E21B 17/10 (2006.01); C09K 8/74 (2006.01); C09K 8/03 (2006.01); E21B 43/00 (2006.01)
CPC E21B 43/27 (2020.05) [C09K 8/03 (2013.01); C09K 8/74 (2013.01); E21B 17/1007 (2013.01); E21B 43/00 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A method comprising:
conveying a downhole tool in a borehole that is formed in a subsurface formation, the downhole tool having a chamber to store a pre-packaged acid-resistant container containing stimulation fluid comprising a stimulation acid, wherein the downhole tool comprises a fluid injector that is fluidly coupled to an output of the chamber via a flow line of the downhole tool;
coating the flow line with an acid resistant fluid; and
injecting, from the fluid injector via the flow line, the stimulation fluid into the subsurface formation that is released through the output of the chamber.