回注水二次污染机制及治理研究

发布时间：2018-05-07 15:24

本文选题：回注水 + 沿程　；参考：《东北石油大学》2016年硕士论文

【摘要】：随着油田低渗透油层的不断精细开发,对注水水质的要求也越来越高,其中悬浮物固体含量已成为衡量注水水质的一项重要指标。回注水中主要包括地层颗粒、腐蚀产物、碳酸盐垢及地层细小泥砂为主。要提高低渗油田的开发效果,必须注够水、注好水,才能使今天的水变成明天的油。从检测数据来看,尽管污水在经过过滤装置后已经取得了较好的效果,主要指标能够满足低渗透油田注水开发的要求。但是,配水间和井口后水质有明显恶化,产生了二次污染,导致注水水质不达标,从而影响了注水开发的效率。研究注水水质中悬浮物沿程变化规律研究,对低渗透油田开发有着重要意义。为搞清油田注水中悬浮物固体沿程增加规律,在龙虎泡区块开展了悬浮物组成分析以及管道沉积物分析研究,与水体分析对比,搞清注水管道悬浮物固体沿程增加规律,同时制定相应技术对策提高水质稳定性,以解决目前存在的含油污水水质二次污染问题。研究结果表明:龙虎泡区块造成悬浮固体增加原因主要在于有机和无机成分含量增加,有机主要是重质油在水中的累积,细菌在水中生长;无机成分主要是可溶性钙镁离子发生化学反应导致生成不溶物,管线腐蚀导致铁含量增加形成铁物质沉积,酸不溶性物质在管线中逐步累积等。对于各因素对于悬浮固体增加量进行计算,其中酸溶物占据增加量最大,达到38%,其次是油达到27%,细菌和其他增量为20%,酸不溶物占15%。建议采用定期清洗管线,投加高效杀菌剂以及防止水质结垢、管线腐蚀办法控制悬浮固体含量增加。
[Abstract]:With the continuous development of low permeability reservoirs in oil fields, the requirement of water injection quality is becoming higher and higher, and the solid content of suspended solids has become an important index to measure the water injection quality. The water injection mainly includes formation particles, corrosion products, carbonate scale and fine mud sand. In order to improve the development effect of low permeability oilfields, it is necessary to inject enough water and good water to turn today's water into tomorrow's oil. From the test data, although the sewage has achieved good results after the filtration device, the main indicators can meet the requirements of low permeability oilfield water injection development. However, the water quality in the water distribution and after the well head has deteriorated obviously, which resulted in secondary pollution, which resulted in the water injection water quality not up to the standard, thus affecting the efficiency of water injection development. It is of great significance to study the variation law of suspended solids in water injection water quality for the development of low permeability oil fields. In order to find out the increasing rule of suspended solids in oilfield water injection, the composition analysis of suspended solids and the analysis of pipeline sediment were carried out in Longhubao block, and compared with the analysis of water body, the law of the increase of suspended solids along the course of water injection pipeline was made clear. At the same time, the corresponding technical countermeasures are made to improve the stability of water quality to solve the problem of secondary pollution of oily wastewater. The results show that the increase of suspended solids is mainly caused by the increase of organic and inorganic components, the accumulation of heavy oil in water and the growth of bacteria in water. The inorganic composition is mainly caused by the chemical reaction of soluble calcium and magnesium ions to form insoluble substances, the corrosion of pipelines leads to the increase of iron content and the formation of iron deposition, and the accumulation of acid insoluble substances in pipelines. For all the factors, the increase of suspended solids is calculated, among which the acid-soluble substance occupies the largest increase, reaching 38 percent, followed by oil to 27 percent, bacteria and other increments to 20, and acid insoluble substances to 15 percent. It is suggested that the pipeline should be cleaned regularly, the high efficiency fungicides should be added, and the scale of water quality should be prevented. The corrosion method of pipeline should be used to control the increase of suspended solid content.
【学位授予单位】：东北石油大学
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：TE357.6;X741

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