靖边气田集气南干线A段防腐层检测与阴极保护效果评价

靖边气田集气干线外防腐主要采用外加绝缘层及阴极保护的方法.通过对南干线密间隔电位测试，绘制通、断电位曲线，判断管道受保护程度和达到保护要求的区域；同时运用电流衰减法测试管道电流衰减程度，推算防腐层绝缘电阻，评价绝缘质量；利用漏点检测仪对干线绝缘层漏点作检测，并进行开挖修复；通过测试土壤电阻率，评价土壤腐蚀性，为气田生产决策及管理提供参考依据.

INSPECTION OF ANTI-CORROSION COATING AND EVALUATION OF CATHODIC PROTECTION EFFECTIVNESS FOR A SECTION OF SOUTH MAIN LINE OF GAS GATHERING SYSTEM IN JINGBIAN GAS FIELD

For anti-corrosion of the main pipeline of gas gathering system,Jingbian a combined method of external insulation coating and cathode protection. Through gas field commonly used close-interval measuring the electrical potential for the south main pipeline, and drawing electrical potential curves, degree of the protectiveness of pipeline and the area of requested protection then were evaluated. At the same time, by mesearing the decay degree of protective current of pipeline by using the way of current attenuation,calculating the insulation resistance of anti-corrosion layer ,so that the insulation quality of the coating was evaluoted, as well as any leakage of the insulation layer was found out by leak-check apparatus which was finally restored. Moreover, though mesearing the soil resistance, the corrosivity of soil was also evaluated which would offer a reference to decision-making and production management of the gas field.