复合型杀菌剂的研究及其在海管中的应用

Research on a compound fungicide and its application in offshore pipelines

海管内硫酸盐还原菌(SRB)具有较强的抗药性,且H2S含量偏高,给油田生产带来较大的隐患。结合海管工况条件,通过对四羟甲基磷硫酸盐(THPS)、聚六亚甲基胍盐酸盐(PHMG)、羟乙基六氢均三嗪进行复配,采用绝迹稀释法研究复配后杀菌剂对SRB的杀菌性能和抗药性能。结果表明:当THPS∶PHMG∶羟乙基六氢均三嗪质量比为3∶2∶5时,杀菌效果最优;加药质量浓度为100 mg/L,杀菌率达到98%。将复合杀菌剂应用于南海东部油田EP18-1至EP24-2海管,结果表明:现场每周冲击加药为200 mg/L时,SRB由150个/L降低至0.6个/L,H_(2)S由150 mg/L降至20 mg/L左右,可以满足现场生产的技术要求。

In order to solve the problem that the sulfate-reducing bacteria(SRB)in offshore oil pipelines have strong drug resistance,resulting in high hydrogen sulfide content in the pipelines,combined with the op⁃erating conditions of the pipelines,tetrahydroxymethyl phosphosulfate(THPS),polyhexamethylene guanidine hydrochloride(PHMG),and hydroxyethyl hexahydromestriazine were compounded,and the bactericidal per⁃formance and drug resistance of the compounded bactericide to sulfate-reducing bacteria were studied by ex⁃tinction dilution method.The results showed that when the mass ratio of THPS,PHMG,hydroxyethyl hexahy⁃drotriazine was 3∶2∶5,the bactericidal effect was optimal,and the bactericidal rate reached 98%at a mass concentration of 100 mg/L.After application in EP18-1 to EP24-2 offshore pipelines in the eastern oil fields of the South China Sea,the results showed that when the on-site weekly impact dosage was 200 mg/L,the SRB decreased from 150 L^(-1) to 0.6 L^(-1),and hydrogen sulfide decreased from 150 mg/L to about 20 mg/L,which could meet the technical requirements of on-site production.