北三区三元污水处理效果实验研究

发布时间：2018-02-04 10:31

  本文关键词： 沉降实验 混掺比例 可视化两级过滤 处理效果 驱油实验　出处：《东北石油大学》2017年硕士论文　论文类型：学位论文

【摘要】：萨北油田现已全面大规模进入三元复合驱油开采阶段,取得了显著提高原油采收率的效果,但在提高原油采收率的同时,也随之产生了大量的三元驱采出污水。通过现场应用发现,聚驱采出污水处理难度较水驱采出污水处理难度增大,三元复合驱采出污水的处理难度更大。而三元复合驱采出污水中的碱、表面活性剂和聚合物大量存在,使得含有不同化学剂的三元采出污水成为一种更加复杂的污水体系,采出液粘度增大,原油乳化严重,这些现象和问题的出现使得污水处理变得非常困难,现油田急需将这些污水进行处理,在避免污染环境的同时,将污水处理合格后作为回注水使用。因此针对这些问题本文通过室内沉降实验,了解不同含剂浓度对含油污水沉降处理效果的影响因素;利用建立的可视化两级过滤装置,模拟三元驱污水和聚驱驱污水混掺过滤实验,对混掺污水的处理工艺技术进行参数优化;利用三种不同配置水稀释聚合物溶液对三种污水稀释聚合物溶液的粘度稳定性进行研究;利用人造三层非均质长方岩心,对比分析并评价混掺污水稀释聚合物溶液的驱油效果。实验研究结果表明:污水水质、污水沉降时间、沉降温度以及含剂浓度多少都对油田三元污水的沉降处理效果产生了影响;通过测得污水中的含油和悬浮物含量,最终确定三元污水与聚驱污水沉降处理最佳混掺比例为1:3,最佳混掺沉降时间界限为8h;通过可视模拟过滤装置模拟三元与聚驱污水的混掺过滤过程,研究了不同滤料级配、过滤速度、混掺比例对过滤处理后混掺污水的含油量、悬浮物含量的影响,确定了过滤速度的最佳界限范围为6m/h-8m/h,最佳滤料级配为级配三,在这样的过滤条件下,三元驱与聚驱混掺污水过滤后达均可以达到水质指标要求,即含油≤20mg/L,悬浮物≤20mg/L;通过对比蒸馏水、聚驱污水和混掺污水稀释聚合物溶液粘度稳定性,发现混掺污水和聚驱污水稀释聚合物溶液粘度稳定性同蒸馏水稀释聚合物溶液粘度稳定性相比相差较大,但两种污水稀释聚合物溶液的粘度稳定性相差不大;通过对比聚驱污水和混掺污水稀释聚合物溶液的驱油效果,混掺污水稀释聚合物溶液提高采收率值比聚驱污水的仅低1.34%,因此将三元与聚驱污水混掺处理再循环利用是有效可行的。
[Abstract]:Sabei Oilfield has now entered the stage of ASP flooding on a large scale, and has achieved a remarkable effect of improving oil recovery, but at the same time improving crude oil recovery. It is found that it is more difficult to treat sewage produced by polymer flooding than that by water flooding. The treatment of sewage produced by ASP flooding is more difficult, and the alkali, surfactant and polymer in the sewage produced by ASP flooding are abundant. The ternary sewage produced with different chemical agents becomes a more complex sewage system, the viscosity of the produced liquid increases and the crude oil emulsifies seriously. These phenomena and problems make sewage treatment very difficult. Now the oilfield is in urgent need of these sewage treatment, in order to avoid the pollution of the environment, the sewage treatment is qualified and used as water injection. Therefore, this paper passes through the indoor settlement experiment to solve these problems. To understand the influence factors of different concentration of agent on the settlement effect of oily sewage; By using the visual two-stage filter device, the mixed filtration experiment of ternary flooding sewage and polymer flooding sewage was simulated, and the parameters of mixed sewage treatment technology were optimized. The viscosity stability of three kinds of waste water diluted polymer solution was studied by using three different water dilute polymer solutions. By using three layers of heterogenous rectangular cores, the oil displacement effect of mixed diluted polymer solution with sewage is analyzed and evaluated. The experimental results show that: water quality and settling time of sewage. The settlement temperature and the concentration of the agent have an effect on the sedimentation treatment of the ternary sewage in oil field. By measuring the content of oil and suspended matter in sewage, the optimum mixing ratio is 1: 3 and the optimum mixing time limit is 8 h. The effects of different filter media gradation, filtration speed and mixing ratio on the oil content and suspended matter content of mixed sewage after filtration were studied by using visual simulation filter device to simulate the mixed filtration process of ternary and polymer flooding wastewater. The optimal filtration speed is determined to be 6m / h-8m / h, and the best filter media gradation is three. Under this condition. The water quality index can be reached after filtration of sewage mixed with ternary flooding and polymer flooding, that is, oil content 鈮，

本文编号：1490026