苏里格气田集输管道阴极保护运行检测及优化案例分析  

Case Study on Inspection and Optimization of Cathodic Protection for Gathering Pipelines in Sulige Gas Field

作　　者：冯朋鑫 宋考平[1] 于淑珍[2,3] 茹志鹃[2,3] 张晓虎 侯世颖 FENG Pengxin;SONG Kaoping;YU Shuzhen;RU Zhijuan;ZHANG Xiaohu;HOU Shiying(School of Petroleum Engineering,Northeast Petroleum University,Daqing 163318,China;Oil and Gas Technology Institute,CNPC Changqing Oilfield Company,Xi＇an 710018,China;State Engineering Laboratory for Exploration and Development of Low Permeability Oil and Gas Fields＇,Xi＇an 710018,China;Beijing Safetech Pipeline Co.,LTD.,Beijing 100083,China)

机构地区：[1]东北石油大学石油工程学院,大庆163318 [2]中国石油长庆油田分公司油气工艺研究院,西安710018 [3]低渗透油气田勘探开发国家工程实验室,西安710018 [4]北京安科管道工程科技有限公司,北京100083

出　　处：《腐蚀科学与防护技术》2018年第6期676-682,共7页Corrosion Science and Protection Technology

摘　　要：以苏里格气田典型区块阴极保护系统为例,本文从恒电位仪运行状况、环境、被保护管道三方面进行了阴极保护系统运行检测及优化,结果表明:站内、外绝缘失效,阳极地床接地电阻过高是导致电流漏失、恒电位仪输出受限、阴极保护不达标的主要因素。同时,多条管道共用一个阴保系统,一条管道受多个阴保站影响带来的常规人工测试难度大、数据准确性差、时效性差等问题给集输管道阴极保护的管理带来了很大的挑战,阴极保护智能化升级改造的成功实施在节省人力、财力的同时带了管理水平的极大提升。The cathodic protection（CP） system for a typical production block in Sulige gas field was surveyed for the purpose of systematic diagnosis. The operation situation of CP was thoroughly inspected along the current path from the rectifier via the environment to the pipeline system, and then optimized accordingly. Results show that the main factors, which led to CP inadequacy, were related to current loss caused by the insulation failure and the increased resistance of anode bed to earth, and the limited output of the rectifier. Moreover, it is found that the CP operation management for gathering pipelines were facing series of challenges, for instance, one cathodic protection facility was sheared simultaneously by several pipelines. The detection of a pipeline was disturbed by neighbor cathodic protection facilities, which results in difficulties for carrying out conventional manual testing and dissatisfied data accuracy and applicability. By taking effective measures for correcting CP anomalies, the CP system was further upgraded for the realization of intelligent management. The successful implementation of intelligent retrofit was proven to be effective to save manpower and investment, thereby to improve greatly the CP management level.

关 键 词：苏里格气田 阴极保护 绝缘失效 阳极地床 智能化 

分 类 号：TE988[石油与天然气工程—石油机械设备]