The Study About Corrosion And Protection Technologies Of Oil And Gas Pipelines

Now,the transportation of oil&gas mainly depends on long distance buried pipelines which are made of iron steel in general. The cross-over sections of the long distance buried pipelines have very complicated terrain condition.The corrosive action of soil will lead to pipeline's damage in varying degrees,and the damage point cann't been detected easily and quickly.Otherwise,the repair of buried pipelines will spend much more time and money than build a new pipeline. So , how to prevent the buried pipeline from corrosion is a vital project for a long-time.Point to three main proplems of buried steel pipeline's anti-crrosive, we made a study of the project which is named anti-crrosive technologies of oil&gas pipelines.The three proplem include that:the technique of coating evalution and judgeing useless;the development of reference electrode used in cathodic protection system of dry areas; the modification of parallel pipeline's anti-corrosive system.By studying literature ,evaluating on-site,detecting and theory certificating,we developed the method of coating evaluation and judgeing useless which can been used to all kinds of coatings.The method provided important reference for developing the plan of pipeline repair.Meanwhile,we designed and made reference electrode used in dry areas whose long-time validity had been confirmed by lab and on-site testing.Our study indicated that the voltage-sharing wire between the Huining and the Minghong pipeline is only a current flow circuit than balancing voltage.By removing voltage-sharing wire,recoating and modificating cathodic protection system,the situation of the Huining/Minghong pileline is changed thoroughly,and the cathodic protection percentage of the two pipelines come up to 100%.