全面腐蚀控制
全麵腐蝕控製
전면부식공제
TOTAL CORROSION CONTROL
2014年
11期
61-65
,共5页
水矿化度%动态模拟试验%静态模拟试验%指标
水礦化度%動態模擬試驗%靜態模擬試驗%指標
수광화도%동태모의시험%정태모의시험%지표
total dissolved solids%dynamic simulation experiment%static simulation experiment%index
大港油田的油藏温度和地层水的性质差异较大，虽然采取了很多的措施减缓注水系统管线腐蚀，但是南部地区的腐蚀速率仍较中北部高许多，因此找出问题所在很有必要。对油田所属9个注水站现场取样分析了水的性质，用静态和动态的方法分析了未灭菌和灭菌状态下腐蚀速率与盐度和硫酸盐还原菌(SRB)数量的关系。结果表明，南部地层水矿化度较高，硫酸根含量达到50-150mg/L，SRB数量不足102个/mL，但腐蚀速率较标准值高71%，中部和北部油田却相反：无菌条件下腐蚀速率高73%，注入水适合微生物生长，pH值和氧化还原电位变化规律却不同。南部油田水因矿化度高，电化学腐蚀占主导地位，此外，微生物的腐蚀也是比较明显的。电镜分析表明，腐蚀产物主要是铁、硫化物和碳酸钙。通过SRB数量和腐蚀速率实验得到了SRB对腐蚀影响，提出了控制SRB数量降低腐蚀速率的指标。
大港油田的油藏溫度和地層水的性質差異較大，雖然採取瞭很多的措施減緩註水繫統管線腐蝕，但是南部地區的腐蝕速率仍較中北部高許多，因此找齣問題所在很有必要。對油田所屬9箇註水站現場取樣分析瞭水的性質，用靜態和動態的方法分析瞭未滅菌和滅菌狀態下腐蝕速率與鹽度和硫痠鹽還原菌(SRB)數量的關繫。結果錶明，南部地層水礦化度較高，硫痠根含量達到50-150mg/L，SRB數量不足102箇/mL，但腐蝕速率較標準值高71%，中部和北部油田卻相反：無菌條件下腐蝕速率高73%，註入水適閤微生物生長，pH值和氧化還原電位變化規律卻不同。南部油田水因礦化度高，電化學腐蝕佔主導地位，此外，微生物的腐蝕也是比較明顯的。電鏡分析錶明，腐蝕產物主要是鐵、硫化物和碳痠鈣。通過SRB數量和腐蝕速率實驗得到瞭SRB對腐蝕影響，提齣瞭控製SRB數量降低腐蝕速率的指標。
대항유전적유장온도화지층수적성질차이교대，수연채취료흔다적조시감완주수계통관선부식，단시남부지구적부식속솔잉교중북부고허다，인차조출문제소재흔유필요。대유전소속9개주수참현장취양분석료수적성질，용정태화동태적방법분석료미멸균화멸균상태하부식속솔여염도화류산염환원균(SRB)수량적관계。결과표명，남부지층수광화도교고，류산근함량체도50-150mg/L，SRB수량불족102개/mL，단부식속솔교표준치고71%，중부화북부유전각상반：무균조건하부식속솔고73%，주입수괄합미생물생장，pH치화양화환원전위변화규률각불동。남부유전수인광화도고，전화학부식점주도지위，차외，미생물적부식야시비교명현적。전경분석표명，부식산물주요시철、류화물화탄산개。통과SRB수량화부식속솔실험득도료SRB대부식영향，제출료공제SRB수량강저부식속솔적지표。
The differences of temperature and formation water characteristics among each reservoir were significant in Dagang oilfield. Although many measures have been taken in an attempt to control steel pipeline corrosion, the corrosion rate in the south block of oilfield was several times higher than that of the middle and north blocks. Further studies, therefore, were needed to clarify the case. The ion and microorganism concentrations of the water in nine central stations were analyzed by sampling of aberration-free point. Under nonsterile and aseptic conditions, the relations among corrosion rate, salinity and SRB numbers were studied by static and dynamic methods. The results showed that, the salinity of formation water in the south block was the high (35g/L), and its SO42-content ranged from 50 to 150mg/L. In the south block of oilfield, the SRB number was less than 102cell/ml, but the corrosion rate was 71 percent higher than standard value. The case in the middle and north block of oilfield was inverse:the corrosion rate was 73 percent higher than that of the aseptic condition;production water was fit for microbial growth;the change law of pH and Eh was different. In the south block of oilfield, electrochemical corrosion was the main factor due to the higher salinity. In addition, microbiologically influenced corrosion was significant. The electron microscope analysis showed that, corrosion products were mainly iron and sulfur compounds, and calcium carbonate. The influence of SRB on corrosion was obtained by experiment between SRB numbers and corrosion rates. A preliminary strategy was proposed to control and reduce SRB numbers, as well as to reduce corrosion.
