Downhole rock treatment method with corrosion inhibition

A downhole rock treatment method with corrosion inhibition in a subterranean geological formation, comprising:

• injecting an acidic treatment fluid into an oil and gas well through metal tubing to react with and/or dissolve rock of the subterranean geological formation and create conducting channels;
• 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) about 15 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.