油藏采出硫化氢对采出液处理系统的影响评价

摘要

The sulfide particles in surface production facilities consist mainly of chemical cor-rosion products of reservoir produced H2S and microorganism induced corrosion (MIC) by sulfate reducing bacteria (SRB).Content of corrosion products by reservoir produced H2S in produced fluid is a dominant factor deciding the choice of bacteria control or sulfide scaveng-ing for sulfide control and their performances. To observe the cumulative effects of sulfide particles on handling of produced fluid over a long period of time and to better describe the process, a pilot produced fluid treatment plant was built and used to evaluate the effects of reservoir produced H2S on the handling of produced fluid. The test results show that water-cut of oil, OIW in water, corrosion rate, and suspended solid content (SS) in water all in-crease with the increase of sulfides in the pilot plant.Water-cut and SS were the two param-eters which increased the most, both with increase rates over 150%. The corrosion products were observed to accumulate in the interface layer between oil and water and form a pad layer.%油田地面系统内的硫化物颗粒主要为油井采出H2S的腐蚀产物和地面系统中SRB繁殖产生的腐蚀产物。油藏采出H2S的腐蚀产物的多少，对采取细菌抑制或硫化物去除两种硫化物控制方案的应用效果具有决定性作用。为解决无法长期观测硫化物颗粒对采出液处理的影响方式及进程的问题，研制了小型模拟试验装置，依此评价大庆油田油藏采出H2S对采出液处理的影响程度。随着模拟试验装置中硫化物含量的升高，油样水含量、水样含油量、腐蚀速率、水样悬浮固体含量均随之升高，其中油样含水量和水样悬浮固体含量受影响程度最大，升高幅度超过150%；腐蚀产物易富集在油水界面区域形成油水过渡层。