反采ASP处理采出水

M. Battashi, Saada Al Shukaili, Sa'ud Al Balushi, Khalid Al Hatmi, As'ad Al Mashrafi
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引用次数: 1

摘要

老化油田的原油生产通常通过注水、聚合物注入和碱性表面活性剂聚合物注入(ASP)等各种提高采收率(EOR)的方法来维持。本研究考虑了阿曼的一个主要老化油田(含水率90%)。该油田已进行注水作业超过15年。为了提高该油田的采收率,阿曼石油开发公司(PDO)于2010年实施了聚合物驱化学提高采收率(cEOR)。ASP是一种旨在从研究油田中开采更多石油的最终手段。ASP的突破有望影响该领域除油设备的性能。结果表明,无论OiW浓度高低,使用孔径为100 nm的陶瓷膜都能完全去除采出水中的油,但采收率仅为2%。用硫酸铝化学剂作为混凝剂处理含油采出水,只有在浓度高于500 mg/L时才有效。硫酸铝对聚合物污染采出水(聚合物浓度为500 ppm)的处理效果较好,硫酸铝浓度为150 mg/L时,出水OiW为39 ppm (v),硫酸铝浓度为500 mg/L时,出水OiW为2 ppm (v),低于水处理系统中抛光装置的OiW浓度。当向采出水中添加ASP时,油滴稳定性得到提高,当硫酸铝浓度为500 mg/L时,处理流出口OiW约为65 ppm (v),而当硫酸铝浓度为700 mg/L时,OiW为零。在混凝剂的帮助下,引入气泡(N2)作为浮选剂,对含ASP的PW的OiW去除率提高了近15%。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Treatment of Produced Water with Back Produced ASP
Crude oil production from ageing oil fields is normally sustained by various enhanced oil recovery (EOR) ways such as water injection, polymer injection and alkaline surfactant polymer injection (ASP). One of the main ageing fields (90% water cut) in Oman is considered for this study. This field is being operated with waterflood for more than 15 years. In order to enhance the oil recovery in this field, chemical enhanced oil recovery (cEOR) using polymer flood was implemented in 2010 by Petroleum Development Oman (PDO) Company. ASP is a recovery method planned as a final resort of cEOR to recover more oil from the studied field. ASP breakthrough is expected to impact the performance of deoiling facilities in this field. Results showed that using ceramic membrane (100 nm pore size) managed to remove oil from produced water completely for high and low OiW concentrations, however only 2% recovery factor was achieved. Using aluminum sulfate chemical as a coagulant to treat the oily produced water was only effective at concentration higher 500 mg/L. In comparison, aluminum sulfate was very effective in treating the produced water contaminated by polymer (500 ppm of polymer concentration) and at 150 mg/L of aluminum sulfate, the outlet OiW reached 39 ppm (v). When Aluminum sulfate was used at concentration of 500 mg/l, the OiW concentration reached 2 ppm (v), which is lower than the polishing unit in the water treatment system. When ASP was introduced to the produced water, the oil droplet stability has increased and at 500 mg/L of aluminum sulfate, the outlet OiW in the treated stream was around 65 ppm (v) however at 700 mg/L of aluminum sulfate, zero ppm of OiW was achieved. Introducing gas bubbles (N2) as flotation with the help of the coagulant agent had improved OiW removal efficiency by almost 15% for the PW with ASP.
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