长北气田钻具腐蚀控制技术

Drilling Tool Corrosion Control Technology in ChangBei Gas Field

针对长北气田的钻具腐蚀现象进行了系统的室内研究和现场取样分析,找出了腐蚀的根本原因是离子环境下溶解氧腐蚀,并通过在循环体系中进行多组氧含量对比测试,找出了钻井液体系中溶解氧的主要来源;并在室内从碱度、盐含量、氧含量等方面对钻具的腐蚀速率影响进行了对比分析,优选出了配伍性良好、有效作用周期持久的新型缓蚀剂,确定了腐蚀控制主要性能参数指标窗口。通过CB19-1等14口井现场实践证明,上述研究成果在经过现场加料工艺改进后,解决了长北气田大位移双分支水平井现场的腐蚀性问题,实现了防止钻具腐蚀控制的目的。

Facing to the problem of drilling tool corrosion in Changbei gas field,research is developed that the main reason of corrosion is oxygen solution in ionic environment,and the origin of oxygen is found through comparison test,as well as a kind of novel anti-corrosive agentis optimized from aspects of pH value salt content and oxygen concentration.The applications in well CB19-1 and other 13 wells show that the problem of drilling tool corrosion in two-branched horizontal wells is covered successfully.