关键词: 产出水, 井筒腐蚀, 影响因素, 腐蚀机理, 正交

Abstract:

In view of the increasingly serious problems of corrosion in NR Oilfield，experimental study on wellbore corrosion
of produced water and influence factors of oil well are carried out. Produced water in typical wells is chosen as the research
object，The influence of corrosion time，pH value，CO2 and H2S concentration on the corrosion rate is systematically studied
by the method of static weight loss. Orthogonal experimental study is applied to investigate several factors which influence the
corrosion rate degree. Experimental results suggested that the corrosion rate reaches the maximum when the corrosion reaction
time is 24 h，then with time increasing the corrosion rate gradually decreased，after 72 h，the corrosion rate maintained constant；
The higher temperature the more serious corrosion that the effect of produced water on coupons. When the temperature gradually
increased，corrosion products turned from yellow to black. And dark red flocculent precipitate created in brown red solution.
At 65 ℃ the lower pH the more serious corrosion that the effect of produced water on the corrosion rate. The effect of H2S
concentration and CO2 concentration on corrosion rate is almost the same. The influence of several factors on corrosion rate
determined by the orthogonal experiment are put in the order of temperature，pH value，H2S concentration，CO2 concentration，
which is consistent with the single factor experimental results.

Key words: produced water, borehole corrosion, influencing factors, corrosion mechanism, orthogonality