镇泾油田污水处理优化研究

发布时间：2019-04-26 09:07

【摘要】：随着勘探开发规模的不断扩大,镇泾油田在生产实际过程中产生的污水量日益增加,污水处理站的日处理量也在不断增加。因此,需要研究出一套适合镇泾油田不同类型污水混配的加药处理技术方案。本文通过对镇泾油田三种不同类型的污水,即采出水、钻井水和压裂液的水质分析,并进行室内实验研究,分别确定出它们的加药处理方案和加药成本。由于镇泾油田不同层位采出水的水质、结垢离子含量及成分都不相同,所以防垢剂的加量也不同。实验室选用磷酸基丁烷三羧酸(PBTCA)作为防垢剂,当采出水为延9、长8层时,投加量为20mg/L,当采出水为长6、长9层时,投加量为40mg/L。对于钻井污水,本文采用絮凝的方法对其进行处理。在室内实验的基础上,筛选出合适的絮凝剂聚合氯化铝(PAC),加量为30mg/L,水质调节剂Na OH,加量为280~400mg/L以及阳离子聚丙烯酰胺(PAM)与聚合铝进行复配,PAM加量为1.0mg/L,并确定出最佳实验温度、反应时间以及加药的时间间隔。基于压裂液中CODcr难处理、难降解的特点,本文采用絮凝-隔油法处理之后再用次氯酸钠结合紫外光对废水进行深度处理。絮凝实验所用药剂为聚合氯化铝(PAC),加量为175mg/L,氧化实验选次氯酸钠作为氧化剂,加量为40mg/L,同时要用紫外光照射30min左右。镇泾油田污水处理站大多来水为不同混配比的混合水,本文通过将任意两种不同类型污水的比例为2:8、4:6、5:5、6:4、8:2时和任意三种不同类型污水的比例为2:2:6、4:4:2、1:2:7、2:3:5、3:3:4时分别进行了计算研究,确定出它们的加药方案。并根据算例进行总结,研究出适合镇泾油田污水在任意不同混配比下的加药规律,以备现场应用。
[Abstract]:With the expansion of exploration and development scale, the sewage produced in Zhenjing oilfield is increasing day by day, and the daily treatment capacity of sewage treatment station is also increasing. Therefore, it is necessary to develop a set of dosing technology scheme which is suitable for different types of sewage mixture in Zhenjing Oilfield. By analyzing the water quality of three different types of sewage in Zhenjing Oilfield, I. E., produced water, drilling water and fracturing fluid, and through laboratory experimental study, their dosing treatment schemes and dosing costs are determined respectively. Because the water quality, scaling ion content and composition of produced water from different layers in Zhenjing oilfield are different, the addition of scale inhibitor is also different. Phosphate butane tricarboxylic acid (PBTCA) was used as scale inhibitor in the laboratory. When the extracted water was 9 and 8 layers, the dosage was 20 mg / L, when the extracted water was 6 and 9 layers longer, the dosage was 40 mg / L. For drilling sewage, this paper uses flocculation method to treat it. On the basis of laboratory experiment, the suitable flocculant polyaluminum chloride (PAC), dosage is 30mg / L, water quality regulator Na OH, dosage is 280~400mg/L and cationic polyacrylamide (PAM) is mixed with polyaluminum polymer aluminum. The dosage of PAM was 1.0 mg / L, and the optimum experimental temperature, reaction time and time interval were determined. Based on the characteristics of difficult treatment and degradation of CODcr in fracturing fluid, this paper uses flocculation-oil separation method to treat the wastewater in depth with sodium hypochlorite combined with ultraviolet light. In the flocculation experiment, the dosage of polyaluminum chloride (PAC), was 175 mg / L, sodium hypochlorite was selected as oxidant in oxidation experiment, the dosage was 40 mg / L, and the 30min was irradiated by ultraviolet light at the same time. Most of the wastewater treatment stations in Zhenjing Oilfield are mixed water with different mixing ratios. In this paper, the ratio of any two different types of sewage is 2-8, 4-6, 5-5, 6-4, 8: 2 and that of any three different types of sewage is 2-2-6, 4-4-2, 1-2-7, 2-3-5, 3-3-4, and the ratio is 2-2-6, 4-4-2, 1-2-7, 2-3-5, 3-3-4-hour, respectively. A computational study was carried out, Determine their dosing plan. On the basis of an example, the dosing law suitable for Zhenjing oilfield sewage with arbitrary mixing ratio is studied for field application.
【学位授予单位】：西安石油大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：X741

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