海上大流量井下油水分离系统设计及实验研究

发布时间：2018-05-15 23:12

本文选题：井下油水分离 + 结构设计　；参考：《北京化工大学》2015年硕士论文

【摘要】：随着技术的不断进步,海上油田已进入大规模开发阶段。但海上油田存在着单井产量大、原油含水率高的特点,而这与海上平台有限的水处理能力构成矛盾,制约了海上油田的开采。井下油水分离技术是解决该问题的一种有效方法。本文以9-5/8时套管完井的大流量井下油水分离系统为研究对象,目标处理量为700m3/d。对DOWS结构形式及分类进行了介绍,并详细分析了各种类型的优缺点。根据装置处理量大的特点,对其整体结构进行了设计,完成了油水分离器子系统中水力旋流器及流道块的设计。对第一级双锥水力旋流器和第二级单锥水力旋流器进行了数值模拟。根据模拟结果得到最佳操作参数；选取双锥水力旋流器入口流量120m3/d,分流比0.5；单锥水力旋流器入口流量60m3/d,分流比0.4；总分流比0.7。对于双锥、单锥水力旋流器串联结构,得出其在相同总分流比、不同分分流比时的压降规律。为提高旋流器油水分离效率采用加入破乳剂的方法。通过实验得出破乳剂浓度在0.08%时,破乳速度最快,浓度在0.4%-0.6%时,破乳效果最好；随温度的升高,破乳剂的破乳效果逐渐提高；在破乳剂浓度在0.08%-0.8%时,油水乳状液中的油滴粒径在1Omin内可增大10倍左右。搭建了可用于对DOWS分离性能进行地面实验的实验台架,并制定实验方案,为后续实验提供了条件。
[Abstract]:With the continuous progress of technology, offshore oil field has entered the stage of large-scale development. However, the offshore oil field has the characteristics of large single well production and high water cut, which is in contradiction with the limited water treatment capacity of offshore platform, which restricts the exploitation of offshore oil field. Downhole oil-water separation technology is an effective method to solve this problem. In this paper, a large flow downhole oil-water separation system with casing completion at 9-5 / 8 is studied. The target processing capacity is 700 m3 / d. The structure and classification of DOWS are introduced, and the advantages and disadvantages of each type are analyzed in detail. According to the characteristics of large handling capacity, the overall structure of the unit is designed, and the hydrocyclone and flow channel block in the subsystem of oil-water separator are designed. The first stage double cone hydrocyclone and the second stage single cone hydrocyclone are numerically simulated. According to the simulation results, the optimal operating parameters are obtained. The inlet flow rate of double cone hydrocyclone is 120m3 / d, the split ratio is 0.5, the inlet flow rate of single-cone hydrocyclone is 60m3 / d, the shunt ratio is 0.4, and the total shunt ratio is 0.7. For the double cone and single cone hydrocyclone series structure, the pressure drop law is obtained when the ratio of the two cones is the same and the ratio of the two cones is different. In order to improve the separation efficiency of hydrocyclone oil and water, the demulsifier was added. The results show that when the concentration of demulsifier is 0.08, the speed of demulsifying is the fastest, when the concentration is 0.4-0.6%, the demulsifying effect of demulsifier is the best, the demulsifying effect of demulsifier is gradually improved with the increase of temperature, and when the concentration of demulsifier is 0.08- 0.8%, The diameter of oil droplets in oil-water emulsion can be increased by about 10 times in 1Omin. The experimental bench which can be used to test the separation performance of DOWS on the ground is built, and the experimental scheme is worked out, which provides the conditions for the subsequent experiments.
【学位授予单位】：北京化工大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TE952

【参考文献】