US 11,987,752 B2
Downhole acid stimulation method with corrosion inhibition
Ime Bassey Obot, Dhahran (SA); and Ahmad A. Sorour, Dhahran (SA)
Assigned to King Fahd University of Petroleum and Minerals, Dhahran (SA)
Filed by King Fahd University of Petroleum and Minerals, Dhahran (SA)
Filed on Nov. 22, 2022, as Appl. No. 18/058,022.
Application 18/058,022 is a continuation of application No. 16/397,593, filed on Apr. 29, 2019, granted, now 11,525,081.
Prior Publication US 2023/0092085 A1, Mar. 23, 2023
This patent is subject to a terminal disclaimer.
Int. Cl. C09K 8/74 (2006.01); C09K 8/54 (2006.01); E21B 41/02 (2006.01); E21B 43/25 (2006.01)
CPC C09K 8/74 (2013.01) [C09K 8/54 (2013.01); E21B 41/02 (2013.01); E21B 43/25 (2013.01); C09K 2208/32 (2013.01)] 15 Claims
OG exemplary drawing
 
1. An acid stimulation method with downhole corrosion inhibition in an oil and gas well in a subterranean geological formation, comprising:
injecting an acidic treatment fluid into the oil and gas well through metal tubing to react with and/or dissolve rock of the subterranean geological formation; then
fracturing the rock;
wherein the acidic treatment fluid is an aqueous solution comprising (i) a corrosion inhibitor composition comprising gelatin and an intensifier selected from the group consisting of CuI, KI, and formic acid, and (ii) 14 to 16 wt. % of HCl, based on a total weight of the acidic treatment fluid,
wherein the gelatin is present in the acidic treatment fluid in a concentration of 0.5 to 2.5 wt. % per total volume of the acidic treatment fluid,
wherein the intensifier is present in the acidic treatment fluid in a concentration in a range of from 0.01 to 0.05 wt. % per total volume of the acidic treatment fluid,
wherein the gelatin has a Bloom number in a range of from 50 to less than 220, and
wherein the gelatin has free carboxyl groups in a range of from 78 to 115 mmol per 100 g of protein.