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用于采出液井下油水分离的水力旋流系统的效益主要在于减少了采出水的开采及处理费用.有效降低了地面处理设备的液体负荷。地面处理设备的减少对海上应用具有重要意义.地面分离设备的减少和费用的降低可延长油田寿命。人们正在对井下分离系统进行进一步研究以提供适于海上应用的各种设备。水力旋流器作为井下油水分离(DOWS)系 相似文献
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旋流式井下油水分离同井注采技术发展现状及展望 总被引:5,自引:0,他引:5
井下油水分离同井注采技术是实现高含水油田经济稳定开发的有效措施,经过几十年发展,形成了旋流分离、重力沉降等多种井下油水分离方式,发展出与之配套的离心泵、螺杆泵、有杆泵等动力系统和封隔系统。但同时也在技术稳定性、可靠性上存在诸多问题,使用范围受到介质参数、工艺特点、油藏数据等多方面的影响,技术推广应用受到限制。随着技术的不断进步,井下油水分离同井注采技术将向着高效、稳定、小型化、低成本、智能化方向发展:研制轴向导流入口水力旋流器,适应139.7 mm (5-1/2″)套管井的应用;开展三次曲线和內锥水力旋流器、多级串联水力旋流器等分离装置研究和应用,提高油水分离效果;开发模块化水力旋流器技术,降低制造成本;研究同井注采系统优化配套技术,提高故障诊断和远程监控水平;提高技术适应性,通过区块应用,实现工程技术对油藏的调节作用,达到稳油控水、节能降耗的目的,形成"井下工厂"开发新模式,引领"第四代"采油技术的发展。 相似文献
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为了延长油田开发寿命,提高油田经济采收率,开展了井下油水分离与回注技术的研究。该工艺管柱应用水力旋流器在井下进行油水分离;运用同轴螺杆泵进行分离液的举升和回注;通过双层油管结构的井下多层封隔工艺管柱保证产出层和注入层的封隔生产。综合含水下降6.2~8.3个百分点,产水量下降了70%以上,取得了较好效果。通过现场试验证明,井下油水分离同井注采工艺可行,将分离水直接回注入油层,可减少无效水循环,降低地面工程成本,延长油田经济开采寿命。 相似文献
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油水分离水力旋流器内流场试验研究 总被引:1,自引:1,他引:0
论述了油水分离水力旋流器的结构及性能。采用先进的二维激光多普勒测速仪(LDV)定量测试了两种不同结构模型的内流场。根据油水分离水力旋流器的结构和内流场特点,将流场分为造旋区、分离区和稳定区等三个区。在造旋区内,流体携带的能量主要转化为旋流加速;分离区是油水分离的主要区段,一般为锥形结构,以补偿动量矩的消耗,维持较高的旋流速度;稳定区则是为了稳定造旋区和分离区的流动,在稳定区底流口应避免产生回流。 相似文献
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Three different inlets of hydrocyclone are studied in combination with the construction of a downhole system and hydrocyclone. By comparing the relationship between the inlet structure & dimensional parameter of hydrocyclone and separation efficiency & pressure loss, the highest efficiency is obtained from the inlet of an involute curve with increasing depth-width ratio from the three types, in which the separation efficiency and pressure loss all drops slowly, for the length of the channel decreases, while it drops rapidly in the other two. The flow guiding ability of the inlet affects the separation efficiency greatly, so the corresponding involute type of inlet of hydrocyclone fits for downhole oil-water separation is optimized, which serves as a basis for the structural design of downhole hydrocyclone. 相似文献
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《石油机械》2020,(6):69-76
海上油田含水率持续增高,增加了采油平台的处理负担和井下的举升压力,因此有必要对海上特高含水油井开展井下油水分离研究。根据海上油田采出液物性参数,初步设计了6种适用的油水分离旋流器。考虑海洋平台井下油水分离工艺的限制、加工成本及精度与分离效果等因素,确定了BLXDL-D为最佳分离装置。针对变螺距螺旋导流式单锥旋流器BLXDL-D结构类型,采用数值模拟的方法对其主要结构参数进行了优化研究,对模拟的可靠性进行了室内试验验证。研究结果表明:BLXDL-D油水分离旋流器最佳的旋流腔长度为65 mm,溢流管直径为12mm,底流管直径为25 mm,此时旋流器分离效率可达到97. 23%,且压力损失相对较小;不同分流比下分离效率的试验值和模拟值最大误差为4. 79%,验证了数值模拟的准确性。研究结果可以为海上高含水平台的井下油水分离旋流器的设计和应用提供参考。 相似文献
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液—液水力旋流器的入口形式及其研究 总被引:8,自引:0,他引:8
就液-液水力旋流器入口形式的种类与有关油-水分离用水力旋流器入口形式的研究工作加以介绍,综合考虑入口与外设管线的连接、流量的合理匹配、入口处可提供的压力、加工制造能力以及水力旋流器内部流场的稳定性等诸多因素,分析了不同入口形式(单入口、双入口、直线型与涡线型入口等)对水力旋流器流场分布及分离特性的影响。 相似文献
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井下油气水力旋流分离器结构优化与数值模拟 总被引:1,自引:0,他引:1
用数值模拟方法对井下油气水力旋流分离器内的气液分离两相流场进行了研究,通过数值模拟得到流场分布规律符合已知的旋流器流场分布规律。将数值计算与室内模拟试验的分离效率进行了对比,结果表明用数值模拟的方法进行流场研究是可靠的。将油气水力旋流分离器的主要结构及操作参数对分离性能的影响进行了模拟,结果表明水力旋流器经过优化设计可以进行井下油气分离,且分离效果较好。所采用的数学模型及模拟方法为井下水力旋流油气分离器进一步优化结构、提高分离效率提供了一条有效途径。 相似文献
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井下双级串联式水力旋流器数值模拟与实验 总被引:1,自引:0,他引:1
利用Euler-Euler法与大涡模拟相结合对井下双级串联式水力旋流器的分流特性和分离特性进行研究,并与实际实验结果相对比。结果表明:入口流量由20 m3/d增加到60 m3/d时,总分流比的范围逐渐变大,且第一、二级水力旋流器的溢流口流量之比与总分流比的变化关系是函数关系;在一定范围内,底流含油质量浓度随着入口流量的增大先减小后增大,随着总分流比的增大先减小后增大;入口流量为25~50 m3/d且总分流比为0.28~0.75时,底流含油质量分数不大于200×10-6;数值模拟预报的分流特性与实验结果一致,预报的分离特性与实验结果存在一定差异。该模拟解决了文献[23]提出的监测模型难以用于配带双级串联式水力旋流器井下油水分离系统工况诊断的问题,并给出了井下工况调节时总分流比的推荐范围,从而可以为现场应用提供一定指导。 相似文献
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Zhuoyi Li Jichao Yin Ding Zhu Akhil Datta-Gupta 《Journal of Petroleum Science and Engineering》2011,78(2):454-463
Without initial seismic or detailed geological information, reservoir characterization is difficult. Downhole temperature distribution in horizontal wells is an important source that helps to characterize the reservoir and understand the bottom-hole flow conditions. The temperature measurements are obtained from permanent monitoring systems such as downhole temperature gauges and fiber optic sensors. Additionally, production history and bottomhole pressures are usually readily available and are routinely used for history matching to improve the initial geological models. By combining the downhole temperature distribution and the production history, more reliable information can be extracted about the reservoir permeability distribution and bottomhole flow conditions in order to optimize the wellbore performance, particularly in horizontal wells.In this paper, a thermal model and a transient, 3D, multiphase flow reservoir model are used to calculate the wellbore temperature distribution in horizontal wells. By comparing the simulated temperature and the observed data, large-scale permeability trends in the reservoir are derived. These permeability trends are then incorporated as ‘secondary’ information in the geologic model building and history matching. The final outcome is a geologic model that has the constraints of both temperature and production history information.A synthetic case is presented to illustrate the procedure. The results show when using production history matching only without distributed temperature data along the wellbore, the water entry location in horizontal wells cannot be detected satisfactorily. By combining production history matching with downhole temperature distribution data in a wellbore, an improved geological model is developed that can match production history and locate water entries correctly. Based on the downhole flow conditions and the updated geological model, the well performance can be optimized by controlling the inflow rate distribution in a horizontal well. 相似文献
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复合式水力旋流器内部流场的数值模拟 总被引:3,自引:3,他引:0
复合式水力旋流器是综合了动态和静态旋流器各自优点的新型水力旋流器.采用修正的RNGK-ε模型,对复合式水力旋流器内部流场进行了数值模拟.计算结果与实验所得数据基本吻合,证明了模型和算法的正确性.其中,轴向速度和切向速度的数值模拟结果和实际测量结果非常接近;在器壁附近的外自由涡区,切向速度的数值计算与实际测量数值基本一致.对径向速度分布规律的模拟将有助于对旋流器的结构及性能的分析,所建立的数学模型和所使用的计算方法为进一步研究复合式水力旋流器的分离机理、流场特性及结构优化设计提供了一条有效的途径. 相似文献
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Two-dimensional flow towards a guarded downhole sampling probe: An experimental study 总被引:1,自引:1,他引:0
J.A. Tarvin G. Gustavson S. Balkunas J.D. Sherwood 《Journal of Petroleum Science and Engineering》2008,61(2-4):75-87
The guarded-probe concept for downhole fluid sampling is analogous to that of focused electrodes for borehole electrical measurements. The guard part of the probe surrounds the sample probe and draws fluid from the near-wellbore region of the rock formation where pore fluid is contaminated with drilling fluid filtrate (invasion fluid). Fluid entering the central sample probe comes from points deeper in the formation, where contamination is lower. We report experiments performed to study the guard probe concept in two dimensions. For these experiments, glass beads contained in a thin cell formed the porous medium. The original, uncontaminated pore fluid was an optical index-matching oil. The invasion fluid was the same oil with a dissolved dye. A camera recorded the displacement of the dyed fluid by the clear fluid and the dye concentration was measured in the flow lines through which fluid was withdrawn. The experiments verify that in 2 dimensions a guarded probe produces clean samples of original pore fluid faster than would a simple probe. The experiments were successfully modeled, without adjustable parameters, by means of a finite-difference numerical reservoir simulator and by computations based on an approximate velocity field given by a complex variable solution of the Laplace equation. 相似文献