【摘要】 研究了渤海SZ36-1海上油田采油污水和注入水(浅层地下水,清水)混配时产生黑色絮状悬浮物的原因。污水和清水矿化度不高(8988和5915mg/L),腐蚀性强,腐蚀速率分别为0.746和0.786mm/a,SRB和TGB菌含量很高,在25∶75~80∶20体积比范围混合时产生黑色悬浮物,50∶50时生成量最高。该悬浮物含8%FeS,2%Fe2S3及90%有机物,是析出的FeS(及Fe2S3)吸附水中大量油性杂质形成的。污水含大量S2-和少量Fe2++Fe3+,S2-来自储层(酸性油藏)流体中的H2S和SRB菌的代谢过程。清水含CO2等,腐蚀性强,金属腐蚀产生Fe2+及Fe3+。利用OLI公司的腐蚀分析软件求得该系统的的主要腐蚀因素是H+,H+来自HCO3-和H2O的电离,主要腐蚀产物为FeCO3,清水中的Fe2+即来自FeCO3。表3参3。更多还原

【Abstract】 The causes for creation of black floccules in the mixture of produced water and fresh injection water (shallow formation water) at offshore oil field SZ36-1, Bohai, are investigated.The produced and the fresh waters have mediumTSDvalues, 8988 and 5915 mg/L and high SRB and TGB population, are highly corrosive with corrosion rate of 0.746 and 0.786 mm/a, respectively and create black floccules/precipitates when mixed in volume ratios 25∶75—80∶20 and especially in 50∶50.The floccules/precipiates are composed of 8% FeS, 2% Fe2S3, and 90% organic substances and formed through adsorption of large amount of oily substances in water onto the precipitated FeS (and Fe2S3) particles.The produced water contains S2-in a large amount and Fe2++Fe3+in a little amount and these S2-originate from H2S in formation fluids of the sour reservoir and from metabolic activities of SRB bacteria.The fresh water contains dissolved CO2and is stronly corrosive and Fe2+and Fe3+in it are produced in result of corrosion of metal.By using OLI s software“corrosion analyzer”it turns out that the main factor for corrosion is H+, which is produced in electrolysis of HCO3-and H2O, and the main corrosion product is FeCO3, which gives the Fe2+in the fresh water.更多还原