共查询到19条相似文献,搜索用时 296 毫秒
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本文对采用同一种改型叶轮,基本相同的喉部尺寸、扩散管尺寸的径向式导叶和流道式导叶的6D100—150改型泵,经现场工业性对比试验表明,改Ⅱ型径向式导叶优于流道式导叶,分析了在同样运行条件下,流道式导叶负荷高,泵效偏低2—4%的原因。文章还总结提高注水泵三大效率方面所做的工作。 相似文献
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通过对大庆石油化工总厂炼油厂在用机泵运行状况分析,找出了泵出口阀节流、电机功率过大等制约机综合效率的因素,提出了堵塞叶轮流道,车削叶轮外径,更换节能电机等节能改造方法,年节电41.25万kWh。 相似文献
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Y形电潜泵生产管柱在海上油田应用广泛,具有不动管柱实现生产、测试和分层采油等多种功能,但是由于技术的局限性,该工艺只能应用于φ244.5 mm井筒。针对海上部分油田φ177.8 mm井筒对该工艺的需求,设计了适用于φ177.8 mm井的Y形生产管柱,同时配套了生产堵塞器、测试堵塞器和锁定式堵塞器等井下工具。通过优化生产堵塞器密封结构,提高了堵塞器的使用性能;测试堵塞器通过金属流管密封性能研究,解决了密封件不耐磨以及寿命短的问题。2011年在渤海油田2口井的现场应用结果表明,在φ177.8 mm套管井中可以通过Y形生产管柱实现不动管柱条件下电潜泵生产与分层测试、分层采油等多项工艺。 相似文献
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《石油机械》2013,(10):56-59
针对海上采油平台注水用多级离心泵由单台运行模式改为多台并联运行模式时叶轮故障率增加的现象,从离心泵实际运行工况出发,利用ANSYS软件分析注水泵首级叶轮在离心惯性力、流道流体压力、前后盖板外侧液体压力、圆盘摩擦力等耦合载荷共同作用下的变形情况。分析结果表明,在多变耦合载荷作用下,叶轮径向应变主要分布在叶片与前、后盖板交界处,且在应变主要分布区域,应变量由叶轮外缘向中心逐渐增大;叶轮变形主要分布在叶轮后盖板外缘靠近叶片吸力面流道出口部分及前盖板靠近叶片压力面流道出口部分,最大变形位置是在叶轮外缘前后盖板与叶片之间的流道上。该分析结果有利于分析叶轮变形失效原因,并且为离心泵叶轮的优化设计和改型提供了充分的理论依据。 相似文献
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电潜泵自20世纪以来广泛应用于海上和非常规油气田,来提高油井的生产效率,是一种革命性的油田生产方法,主要适用于自然压力和能量不足的井。潜水离心泵最初是用于抽取矿井中积水而开发的。阿迈斯·阿鲁图诺夫开发了第一台用于油井生产的电潜泵。此后电潜泵逐渐在石油行业中广为人知并流行起来。然而,电潜泵对流动条件非常敏感,为了提高其耐受性、效率、可靠性以及适应恶劣和复杂的井下流动条件,电潜泵经历了许多重大的技术改进。目前电潜泵通常由电动机、密封和一系列离心泵级组成,非常适合于高产的深井和偏斜井中,也常用于非常规井,如页岩油井。因此,电潜泵的耐气性、粘度影响以及长期开采能力已经引起了重大关注。由于其内部流动规律复杂,两相混输风险高,高粘/气液两相流工况下耐受极限和长效开采能力受限,严重制约了电潜泵在深水和非常规油气田安全高效开采中的运用。本文基于欧拉方程,利用最佳流速概念推导回流、摩擦和泄漏等损失,提出了适用于井下旋转电潜泵复杂工况下增压性能预测的理论模型。针对气液两相流动,该模型基于离心场中两相的力学分析,建立旋转叶轮内部体含气率模型,并根据流型选择曳力系数,计算两相滑移效应,修正混合相密度,进而提升... 相似文献
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《Journal of Petroleum Science and Engineering》2005,46(3):161-170
This paper reports the results of a study on the effect of the position of impellers on homogenization time in a large scale 19,000 m3 crude oil storage tank. Based on the good agreement found between the predicted and the site measured results for an existing tank equipped by a single impeller, the hydrodynamics of the flow generated by two, three and five side entry impellers arranged in two different orientations is theoretically studied. In order to achieve this, an in-house CFD code with the ability of simultaneous solving of continuity and Reynolds-averaged Navier–Stokes (RANS) equations is used. The RNG (renormalization group) version of the k-ε turbulence model is applied for turbulence modeling. The fluid region is divided into a large number of control volumes (580,000 to 900,000), and the MFR (multiple frames of reference) model is used for impeller modeling. The velocity distribution inside the tank for two different types of impellers layouts is investigated and the crude oil mixing time for these two arrangements is compared. The results show when the impellers are placed close to each other in one bottom quarter of the tank, mixing is more efficient in comparison with the distributed arrangement. When the tank is equipped with two and three impellers, the mixing performance is quite different in the two different orientations. However, in the five impellers cases, no considerable difference is observed except at the beginning and finishing parts of homogenization. 相似文献
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根据委内瑞拉稠油开发的实际情况,按照稠油加稀油稀释的基本原理,对QYDB149系列潜油电泵机组进行了配套研究与结构改进,着重考虑了稠油井况、出砂严重的井况以及定向井井况。现场应用表明:潜油电泵注石脑油稀释工艺技术能很好地满足实际工况的需要,已产生了良好的经济和社会效益。 相似文献
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为了将常规气井常用的电潜泵排水采气工艺应用于高含硫气井,同时满足高含硫气井保护套管的要求,基于高含硫气井的完井方式及电潜泵排水采气工艺自身的技术特点,针对套管保护、气体干扰及深井电潜泵机组振动等问题,在完井管柱设计、工具配套等方面开展了攻关研究,并在L2井进行了排水采气工艺设计。结果表明:(1)所研发的一套以罐装电潜泵系统为主体、结合锚定式插管封隔器形成的高含硫气井完井管柱系统能够实现电潜泵的正常运行,并且满足保护套管的要求;(2)采用多相流泵及放气管线可以应对气体干扰的问题,使用自动换向阀可以降低电潜泵复杂流道对气井自喷的影响,配套带锚定机构的插管封隔器能够降低管柱振动;(3)所设计的罐装电潜泵系统可应用于?244.5 mm和?177.8 mm套管,其中?244.5 mm套管对应的电潜泵最大排量为900 m3/d、最高扬程为4 500 m;?177.8 mm套管对应的电潜泵最大排量为300 m3/d、最高扬程为3 000 m。结论认为,该项研究成果为高含硫气井实施电潜泵排水采气工艺提供了技术支撑。 相似文献
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A. S. Shapiro S. S. Panaiotti A. A. Artem’ev 《Chemical and Petroleum Engineering》2007,43(9-10):554-562
Information about cavitation characteristics of centrifugal pumps and critical cavitation conditions is given. Depending on the position of the leading edge, impellers are divided into three groups. The spatial lattice of the impeller is presented as a set of elementary lattices on the axisymmetric surfaces of a current of equal-velocity meridional flow. Equations have been derived from the determination of the cavitation margin and the equation of the energy in relative motion for the critical cavitation margin containing a cavitation coefficient referred to the impeller inlet. General equations have been obtained for the critical cavitaion coefficient of specific speed, which can be used to analyze the influence of geometric and operating conditions on the suction capacity of centrifugal impellers, which must be taken into account in designing them. The selection of the typical inlet diameter of the impeller has been substantiated and the critical cavitation coefficients of the elementary lattices have been found. An empirical equation, valid in the whole range of parameters encountered in practice, has been derived for the cavitation coefficient of type-3 impellers with a leading edge located roughly on the diameter of the impeller neck. An analytical equation, applicable for type-1 and-2 impellers, is given for the critical cavitation coefficient with empirical force coefficient values. A scheme for calculation of the suction capacity of such impellers is presented. 相似文献