大庆油田油水井套管侧挂串状阳极防腐模拟实验研究

EXPERIMENAL SIMULATION OF EFFECTIVENESS OF CORROSION CONTROL BY SERIAL ANODE FOR OIL-WATER WELLS IN DAQING OILFIELD

针对大庆油田油水井浅表层套管腐蚀外漏逐年加剧的问题,对于正常生产的油水井套管的防腐保护提出套管外壁侧埋深井牺牲阳极串的防腐蚀技术.通过室内模拟实验,发现在水电阻率和阴-阳极面积比近似相同的情况下,深埋阳极对套管的保护效果明显优于浅埋阳极,阳极以串、并联组合方式连接有较大的电流输出和较好的电位分布.结果表明,阳极以深埋方式为宜,阳极埋入深度在3000 cm^5000 cm左右为最佳位置,阴阳极间最佳距离为900 cm.

In view of the fact that corrosion induced leakage of casings gets much severe year by year of oil - water wells in Daqing oilfield, we put forward the anticorrosion methodology of sacrifice anodes, and the technology is the serial anodes are buried on the flank of the working casing of oil-water wells. Through simulation experiment in the laboratory, it follows that in case the water electric resistivity is appoximately egual to the cathode-anode area ratio, anodes should be buried underground with a depth of 3000 cm-5000 cm, the way of anodes combination is connection in series-parallel, and it would come into being the bigger electric current output and the good potential distribution. The suitable spacing between of anode and cathode ranges around 900 cm.