Effect of Petroleum on the Microbiologically Influenced Corrosion under Biocide THPS Resistance

Abstract

Bactericides are a common method for preventing and controlling microbiologically influenced corrosion (MIC) in the offshore oil and gas extraction industry.However，bactericides may cause changes in the behavior of microbial corrosion，and the presence of petroleum will also have a certain impact on the effectiveness of bactericides.In this work， the effect of tetrakis (hydroxymethyl) phosphonium sulfate(THPS) on the corrosion behavior of biocide sulfate-reducing bacteria (Desulfobaculum bizertense) in the presence of petroleum was studied by cell counting， corrosion weight loss， surface analysis and electrochemical analysis.Results showed that although THPS could inhibit the growth of D.bizertensis，it aggravated the corrosion of D.bizertensis on X70 pipeline steel.Meantime，the addition of petroleum further increased the corrosion potential， indicating that even with the addition of bactericides， petroleum still promoted the corrosion of D. bizertensis on X70.The above result provided a reference for the rational use of bactericides in marine oily environments.

Keywords

• microbiologically influenced corrosion； thps； x70 pipeline steel； sulfate reducing bacteria； petroleum