含聚污水稀释聚合物溶液影响因素研究及处理工艺优选

发布时间：2017-12-27 09:01

本文关键词：含聚污水稀释聚合物溶液影响因素研究及处理工艺优选　出处：《哈尔滨工业大学》2015年硕士论文　论文类型：学位论文

【摘要】：目前,大庆油田每年用于聚驱配注的聚合物干粉用量已达到6×104吨,为了节约清水用量进而降低聚合物驱油成本,大庆油田建成了利用深度处理含聚污水稀释抗盐性聚合物溶液的配注站。这项技术不仅缓解了含油污水回注困难的状况,同时也解决了污水排放需要大量处理费用的问题。但含聚废水深度处理过程中存在滤速低、滤罐多、占地面积大、处理量小等问题。从节约水资源和降低运行成本的角度考虑,采用普通含聚污水作为聚合物溶液稀释水将成为今后大庆油田聚合物配制系统的发展趋势。本课题以深度处理后含聚废水和普通含聚污水为研究对象,展开普通含聚污水作为聚合物溶液稀释水的可行性研究,对比水质分析结果得出结论:两种水质主要差别在悬浮固体含量和含油量,普通含聚污水的含油量及悬浮固体含量远高于深度处理后含聚污水,而且普通含聚污水中Fe2+含量也略高于深度处理后含聚污水。通过分析普通含聚污水中各种成分对于聚合物溶液粘度的影响及其相关变化趋势,确定含聚污水中各离子对含聚污水稀释聚合物溶液粘度的影响大小顺序为Fe2+S2-Mg2+Ca2+Fe3+Na+。研究还发现含聚污水中的油与悬浮固体含量基本对聚合物溶液粘度不产生影响,而高矿化度会导致聚合物溶液的急剧降粘。针对主要影响因素,选择出能够实现较好增粘效果且经济可行的普通含聚污水处理方法,通过对比试验,确定降低矿化度、投加络合剂去除钙镁离子、投加氧化剂、曝氧等方法均可有效提高含聚污水稀释聚合物溶液的粘度。比较分析这几种增粘方法,认为曝氧法是最为高效经济的增粘方法。为了进一步证实将曝氧法应用于处理普通含聚污水的可行性并确定最佳曝氧方法和处理参数,在六厂喇270站进行现场试验。结果表明:空压机和射流器两种曝氧方式去除还原性物质的效果相当。从溶氧效果角度来看,空压机溶氧效果好于射流器溶氧,且在同等气水比条件下稀释聚合物母液后的粘度却基本相同。从经济角度选择空压机进行曝氧。当气水比为0.6时,深度含聚污水稀释聚合物溶液的粘度达到最大值48.5 mpa·s,当气水比为0.8时,普通含聚污水稀释聚合物溶液的粘度达到最大值43.7 mpa·s。普通含聚污水稀释母液粘度基本达到深度水稀释聚合物母液粘度,证实利用曝氧工艺处理含聚污水用于稀释聚合物溶液的方法是可行的。
[Abstract]:At present, the amount of polymer dry powder used for polymer flooding and polymer injection has reached 6 * 104 tons every year in Daqing oilfield. In order to save water consumption and reduce the cost of polymer flooding, Daqing oilfield has built a distribution station for deep treatment of polymer containing wastewater and dilute salt resistant polymer solution. This technology not only alleviates the difficult situation of the reinjection of oily sewage, but also solves the problem that the sewage discharge needs a lot of treatment costs. However, there are many problems in the process of wastewater treatment, such as low filtration rate, large filter tank, large area and small amount of treatment. From the point of saving water resources and reducing operation cost, it is considered that the development trend of polymer preparation system in Daqing oilfield will be the use of ordinary polymer containing wastewater as diluent of polymer solution. This topic in depth after the treatment of wastewater containing polymers and polymer containing wastewater as the research object, expand common sewage as a feasibility study of polymer solution diluted with water, compared to water quality analysis results concluded: the main difference between the two kinds of water in the suspended solids and oil content, ordinary oil and suspended solids content in the polymer containing sewage much higher than the depth of treatment of sewage, and ordinary polymer containing Fe2+ content in sewage is also slightly higher than the depth of treatment of sewage. By analyzing the influence of various components of ordinary sewage containing polymer on the viscosity of polymer solution and its related trend of change, it is determined that the influence of ions contained in poly water on the viscosity of polymer solution diluted with polymer water is Fe2+S2-Mg2+Ca2+Fe3+Na+. It is also found that the content of oil and suspended solids in polymer containing sewage basically has no effect on the viscosity of polymer solution, and the high salinity will lead to the sharp decrease of polymer solution. According to the main influencing factors, selection can achieve better thickening effect and economical and feasible processing method of ordinary sewage containing, through contrast test, determine the lower degree of mineralization, adding complexing agent to remove calcium and magnesium ions, dosage of oxidant, oxygen exposure and other methods can effectively improve sewage dilution and the viscosity of polymer solution. Comparing and analyzing these methods, it is considered that aeration is the most efficient and economical method. In order to further confirm the feasibility of applying aeration method to treat ordinary sewage containing polymer and determine the best aeration method and processing parameters, field experiments were carried out at six 270 RAAS station. The results show that the effect of two oxygen aerator in air compressor and jet apparatus to remove the reductive substances is equal. From the point of view of dissolved oxygen, the effect of air compressor is better than that of jet oxygen, and the viscosity of polymer solution is basically the same under the same air water ratio. The air compressor is selected for aeration from the economic point of view. When the ratio of gas to water is 0.6, the viscosity of polymer solution diluted with polymer containing wastewater reaches the maximum value of 48.5 MPa? S. When the ratio of gas to water is 0.8, the viscosity of polymer solution diluted with ordinary polymer wastewater reaches the maximum value of 43.7 MPa? S. The viscosity of the diluted mother liquor of ordinary polymer containing wastewater basically reaches the viscosity of polymer solution diluted by deep water. It is proved that it is feasible to treat polymer containing wastewater by aeration process to dilute polymer solution.
【学位授予单位】：哈尔滨工业大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：X741

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