普光气田地面生产系统腐蚀控制技术及其效果  

Corrosion control technology in and effects of ground production system in the high-sulfur Puguang Gas Field

作　　者：王寿平[1] 黄雪松[2] 李明志[1] 刘奎[1] 陈长风[2] 

机构地区：[1]中国石化中原油田普光分公司 [2]中国石油大学(北京)材料科学与工程系

出　　处：《天然气工业》2012年第12期97-101,135,共5页Natural Gas Industry

摘　　要：高含硫天然气田地面生产系统面临H2S/CO2以及元素硫共存等苛刻条件下的腐蚀问题,这是目前开发此类气田的难点之一。通过分析普光高含硫气田开发过程中运用的腐蚀控制技术及其效果,可为有效控制此类油气田开发过程中的腐蚀问题提供依据。首先将室内模拟试验选材和缓蚀剂筛选作为控制腐蚀开裂和电化学腐蚀失重的主要措施,结合腐蚀挂片、探针、电指纹监测、超声成像测厚和智能清管检测以及服役前后材料理化性能对比测试,确定材料服役过程中的腐蚀特征、腐蚀机制以及缓蚀剂作用效果,从而为进一步针对腐蚀关键部位的腐蚀控制和监检测提供依据。该腐蚀控制综合技术的运用效果表明,目前普光气田整体腐蚀速率小于0.076mm/a,材料力学性能未出现损伤退化,处于受控状态。而元素S沉积和地层水聚集将诱发少量局部腐蚀,这一问题将成为腐蚀控制的重点。Ground production facilities in high-sulfur gas fields are confronting with corrosion problems under the harsh condition of coexistence of H2S/CO2 and element sulfur,which has become the knotty in the development of such gas fields.In view of this,the case history of the Puguang Gas Field provides reference for corrosion prevention and control in the production of similar gas fields.First,laboratory simulation tests for material and inhibitor selection are used as the main measures to control corrosion cracking and weight loss of electrochemical corrosion.The integrated use of corrosion coupons,probe,electrical fingerprint monitoring,ultrasonic imaging thickness measurement,intelligent pigging detection,and the comparison of physical and chemical properties of the material before and after service are used to determine the corrosion characteristics and corrosion mechanism of the materials as well as the effect of corrosion inhibitors.These methods provide basis for corrosion control,monitoring and detection of critical parts.The application of the integrated use of corrosion control technologies shows that the present overall corrosion rate in the Puguang Gas Field is less than 0.076 mm/a,and the mechanical properties of the materials have been kept well under control without being damaged or degraded.In conclusion,the integrated use of corrosion control technologies and optimized methods will significantly mitigate the corrosion risk of high-sulfur gas fields and ensure the safe operation of the ground production system.The deposition of sulfur and gathering of formation water will result in a little bit of local corrosion,which becomes the focus of subsequent corrosion control in this field.

关 键 词：高含硫气田 高温高压 H2S/CO2腐蚀 元素硫腐蚀 腐蚀控制 腐蚀监测 腐蚀检测 

分 类 号：TE983[石油与天然气工程—石油机械设备]