	US 11,739,252 B2
	Microbecidal composition and a method for mitigating internal microbiological influenced corrosion in petroleum transporting pipelines
Manoj Kumar, Haryana (IN); Qazi Mohammad Amir, Haryana (IN); Prakash Chandra Sahoo, Haryana (IN); Suresh Kumar Puri, Haryana (IN); and Sankara Sri Venkata Ramakumar, Haryana (IN)
Assigned to Indian Oil Corporation Limited, Mumbai (IN)
Filed by Indian Oil Corporation Limited, Mumbai (IN)
Filed on Mar. 11, 2021, as Appl. No. 17/199,226.
Claims priority of application No. 202021010344 (IN), filed on Mar. 11, 2020.
Prior Publication US 2021/0284894 A1, Sep. 16, 2021
Int. Cl. E21B 41/02 (2006.01); C09K 8/54 (2006.01); A01N 25/12 (2006.01); A01N 35/02 (2006.01); A01N 33/12 (2006.01); A01N 43/80 (2006.01); A01N 57/20 (2006.01)

CPC C09K 8/54 (2013.01) [A01N 25/12 (2013.01); A01N 33/12 (2013.01); A01N 35/02 (2013.01); A01N 43/80 (2013.01); A01N 57/20 (2013.01); E21B 41/02 (2013.01)]

8 Claims

1. A microbicidal composition consisting of:

(i) a lignin-based nanoparticle in an amount ranging from 2000-20,000 ppm;

(ii) a biocide in an amount ranging from 500-5000 ppm;

(iii) a surfactant in an amount ranging from 100-1000 ppm;

(iv) a corrosion inhibitor in an amount ranging from 50-500 ppm; and

(v) at least one alcohol, wherein the lignin-based nanoparticle, the biocide, the surfactant, and the corrosion inhibitor are dispersed in the at least one alcohol, and wherein the microbicidal composition mitigates internal microbiological influenced corrosion caused by a bacterial biofilm deposited on a metal surface in petroleum transporting pipelines.