陵水气田输气管道阴极保护效果数值仿真研究

目的 研究海水环境因素和工况因素对其海底管道的牺牲阳极阴极保护效果。方法 针对国内首个自主知识产权深水平台——陵水平台，基于边界元开展管道的阴极保护仿真计算，重点研究不同涂层破损率、海水流速和海水电导率对其管道牺牲阳极阴极保护效果的影响。结果 涂层破损率从1%增加到10%，同样的牺牲阳极保护方案，管道的最正阴极保护电位增加了102 mV；海水电导率从4 S/m减小到2 S/m，管道的最正阴极保护电位增加了10 mV；海水流速从0 m/s增加到4 m/s，管道的最正阴极保护电位增加了26 mV。结论 涂层破损率增大、海水电导率降低、海水流速增加等都会导致阴极保护效果的降低，因此在设计阶段，需要考虑环境工况因素对阴极保护效果的影响，确保达到合理的阴极保护效果。

Simulation Study on Influencing Factors of Sacrificial Anode Cathodic Protection Effect of Oil Pipeline of Lingshui Platform

The paper aims to study the sacrificial anode cathodic protection effect of seawater environmental factors and working conditions on its submarine pipelines. Aiming at the Lingshui platform, the first deep-water platform with independent intellectual property rights in China, the cathodic protection simulation calculation of pipelines was carried out based on boundary elements, focusing on the effects of different coating damage rates, seawater flow rate and seawater conductivity on the sacrificial anode protection of pipelines. As a result, the coating damage rate increased from 1% to 10%. With the same sacrificial anode protection scheme, the most positive cathodic protection potential of the pipeline increased by 102 mV; the seawater conductivity decreased from 4 S/m to 2 S/m. The positive cathodic protection potential increased by 10 mV; the seawater flow rate increased from 0 m/s to 4 m/s, and the most positive cathodic protection potential of the pipeline increased by 26 mV. The increase of coating breakage rate, decrease of seawater conductivity and the increase of seawater flow rate will reduce the cathodic protection effect. Therefore, in the design stage, the influence of environmental conditions on the cathodic protection effect needs to be considered to ensure reasonable cathodic protection effect.