苏里格气田典型区块阴极保护系统评价及优化  

Evaluation and Optimization of Cathodic Protection for Pipelines in a Typical Block of Sulige Gas-field

作　　者：冯朋鑫 宋考平[1] 于淑珍[2,3] 茹志鹃 张晓虎[4] FENG Pengxin1＇2＇3, SONG Kaoping, YU Shuzhen2＇3, RU Zhijuan2＇3, ZHANG Xiaohu4(1 School of Petroleum Engineering, Northeast Petroleum University, Daqing 163318, China 2 Sulige Gas Field Research Center, Petro China Changqing Oil Field Company, Xi＇an 710018, China 3 State Engineering Laboratory for Exploration and Development of Low Permeability Oil and Gas Fields, Xi＇an 710018, China 4 Beijing Safetech Pipeline Co., LTD., Beifing 100083, Chin)

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苏里格气田研究中心,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2期207-212,共6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,对该区块集输管道阴保效果进行了综合评价。通过恒电位仪运行状况、绝缘接头性能、阳极地床接地阻性以及管道防雷保护接地的现场检测表明,对于被保护管道与现有接地系统绝缘失效,管线之间电连续性不良是导致保护电流漏失,阴保效果不佳甚至失效的主要因素;气候、地质条件以及气阻等综合因素导致阳极接地电阻变大,并呈周期性变化。经过现场的优化处理后,区块内管线阴极保护保护率从不足70%提升到100%。研究结果可为今后类似油气田阴保系统的优化设计和效果评价提供指导。A comprehensive evaluation of the effectiveness of cathodic protection（CP） of the pipelines at Suligegas-field was conducted by taking the cathodic protection system of a typical block of as an example in terms of the operating status of rectifiers, the insulation performance of joints, the grounding resistance of anode-beds and the lightning protection grounding. Results show that the inefficient isolation for the pipeline protected with the existing grounding system and the bad electrical continuity between the pipelines were the main path responsible for the current-leakage, therby leading to cathodic protection failure. In addition, the seasonal climate change, topographic elevation change, and gas blockage for anode-bedsall contributed to the increase of anode-bed resistance in a periodic manner. After onsite optimization treatment, the CP protection rate of pipeline in that block increased from less than 70%to 100%. The research results can provide guidance for the optimization design and effect evaluation of similar oil-and gas-fields in the future.

关 键 词：苏里格气田 阴极保护 绝缘失效 阳极地床 保护率 

分 类 号：TE988[石油与天然气工程—石油机械设备]