本文選題：井下油水分離 + 結構設計　； 參考：《北京化工大學》2015年碩士論文

【摘要】：隨著技術的不斷進步,海上油田已進入大規模開發階段。但海上油田存在著單井產量大、原油含水率高的特點,而這與海上平臺有限的水處理能力構成矛盾,制約了海上油田的開采。井下油水分離技術是解決該問題的一種有效方法。本文以9-5/8時套管完井的大流量井下油水分離系統為研究對象,目標處理量為700m3/d。對DOWS結構形式及分類進行了介紹,并詳細分析了各種類型的優缺點。根據裝置處理量大的特點,對其整體結構進行了設計,完成了油水分離器子系統中水力旋流器及流道塊的設計。對第一級雙錐水力旋流器和第二級單錐水力旋流器進行了數值模擬。根據模擬結果得到最佳操作參數；選取雙錐水力旋流器入口流量120m3/d,分流比0.5；單錐水力旋流器入口流量60m3/d,分流比0.4；總分流比0.7。對于雙錐、單錐水力旋流器串聯結構,得出其在相同總分流比、不同分分流比時的壓降規律。為提高旋流器油水分離效率采用加入破乳劑的方法。通過實驗得出破乳劑濃度在0.08%時,破乳速度最快,濃度在0.4%-0.6%時,破乳效果最好；隨溫度的升高,破乳劑的破乳效果逐漸提高；在破乳劑濃度在0.08%-0.8%時,油水乳狀液中的油滴粒徑在1Omin內可增大10倍左右。搭建了可用于對DOWS分離性能進行地面實驗的實驗臺架,并制定實驗方案,為后續實驗提供了條件。
[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.
【學位授予單位】：北京化工大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：TE952

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