高钢级油井管在高温高压气井全生命周期环境中的腐蚀行为及寿命预测

赵密锋, 付安庆, 胡芳婷, 谢俊峰, 龙岩, 耿海龙

Corrosion Behavior and Life Prediction of High Grade OCTG in Full-life-cycle Environment of High Temperature High Pressure Gas Well

ZHAO Mifeng, FU Anqing, HU Fangting, XIE Junfeng, LONG Yan, GENG Hailong

表1 气井全生命周期环境的腐蚀介质特征

Table 1 Characteristics of gas well full-life-cycle environment

Full-life-cycle environment Composition / mg·L-1 pH Temperature / ℃ Time Live acid (LA) 10%HCl+1.5%HF+3%HAc+5%TG201 corrosion inhibitor 10%~20% acid solution 120 4 h Spent acid (SA) K+ / 1597.32, Ca2+ / 11693.00, Mg2+ / 3145.63, Cl- / 62738.01, Fe2+/52.40 2.6 180 5 d Condensate water (CW) K+ / 7380, Ca2+ / 4.745, Mg2+ / 2.463, Na+ / 1050，HCO3- / 4310, Cl- / 2990, SO42- / 862 7.79 180 10 d Formation water (FW) K+ / 6620, Ca2+ / 8310, Mg2+ / 561, Na+ / 76500, HCO3- / 189, Cl- / 128000, SO42- / 430 6.98 180 15, 30, 60 and 90 d