溶解性气体对油井腐蚀速度影响分析

元城油田是鄂尔多斯盆地开发较早的油田之一,边底水发育,采出液组分复杂,H_2S、CO_2溶解性气体含量高,油井套管腐蚀速度快,严重影响了油井正常生产。通过以元城油田采出水为基液,开展了H_2S、CO_2、O_2单一气体和三种气体共存状态下,不同浓度对油井腐蚀速度的影响情况的分析研究,并取得了一些认识:H_2S、CO_2单一气体腐蚀速度存在极限值,含氧后钢腐蚀速度随含氧量增加而增加;另外,在三种溶解气体共存体系中,起主要因素的是H_2S,其次是CO_2和O_2。

Influence of dissolvable gas to oil well's corrosion speed

Yuancheng oil field is one of the earlier exploit oil field in Ordos basin.Edgebottom water develops.Constituents of production stream are complicated.Contents of dissolvable gas like H_2S and CO_2 are high.Oil well casing's corrosion speed is high.All of these influence oil well's normal production seriously.We use Yuancheng oil field's production stream as base solution,analysis oil well's corrosion speed in different density of H_2S,CO_2, O_2,coexist of these three gases.Through analysis and research we gain some achievements. First,corrosion speed of single gas like H_2S and CO_2 have a limiting value,and when the base solution has oxygen,the corrosion speed will add as oxygen content's add.Second,in coexists system of these three dissolvable gases,main factor is H_2S,next is CO_2,O_2.