螺杆泵工况诊断(英文).docx

Research on the screw pump working condition diagnosis technologyAbstractThis thesis selects the screw pump as well pumping mode as the object, working condition of ground drive screw pump well as mainly focuses on the various parameters, with the help of Shuguang oil production plant of Liaohe oilfield test, in the normal production data for working condition judgment condition of screw pump pumping well analysis and judgment. First of all, this testing system for screw pump wells hardware devices are studied by the basic realization of correlation function and main technical index. Secondly, establish working condition diagnosis model, ground drive screw pump well，at the same time, study the fault type of sucker rod and tubing for screw pump, and subdivided into 11. Then, the fault diagnosis method respectively from the traditional diagnosis method, characteristic curve control method and the method of synthetical diagnosis were analyzed, ground drive screw pump working condition diagnosis method program diagram, drawing in addition, calculation formula of motor working condition diagnosis and system efficiency of screw pump well established, laid the solid foundation for the daily study and field application. Based on the above research results, research and development of the supporting software of screw pump well. Finally, the screw pump well Shuguang oil production plant of Liaohe Oilfield Company of five representative was analyzed and the effect of field application test, the feasibility and necessity of this study further verified through field test, indicates that the practice value of the research.Keywords: screw pump; working condition diagnosis;rod; efficiency of the system摘要本研究论文选取以螺杆泵作为采油方式的抽油井作为对象，以地面驱动螺杆泵井的工作状况作为研究的主要重点，借助辽河油田曙光采油厂测试的各种参数，以正常生产数据为判断条件对螺杆泵抽油井的工作状况进行分析和判断。首先，本文对螺杆泵采油井的测试系统的硬件设备进行了研究提出了基本实现功能和主要技术指标的相关要求。其次，建立了地面驱动螺杆泵井工况诊断计算模型，同时，对螺杆泵井故障类型分为井下泵故障、抽油杆故障和油管故障，并细分为 11 种。然后，对故障诊断方法分别从传统诊断方法、特征曲线对照法和综合诊断法进行了分析，绘制了地面驱动螺杆泵工况综合诊断法程序框图，另外，对电机工况和螺杆泵井系统效率进行了相应研究，为日常研究和现场应用打下了坚实基础。依据以上研究成果，开发完成了螺杆泵井工况分析配套软件。最后，选取了辽河油田公司曙光采油厂五口具有代表性的螺杆泵井进行了现场应用检验和效果分析，通过现场试验进一步验证了本文研究的可行性和必要性，初步证明了本课题研究成果的实践价值。关键字：螺杆泵；工况诊断；系统效率The main contents and methodsIn this paper, ground drive screw shaft condition diagnosed on research priorities,Liaohe Oil field Shuguang each test kind parameters as the basis for normal oil production data to judgment condition for troubles hooting wells.This paper introduces the Screw pump technology development, and mention Realization of the basic functions and the main technical indicators requirements by researching from the device hardware for screw production wells.Analysis of the forces screw,establish ground drive screw well pump condition diagnosis calculation model,at the same time,the type of fault on the screw shaft to refine classification. Carry out the screw pump wells research diagnostic methods were analyzed from the traditional diagnostic methods,characteristic curve control method and comprehensive diagnostics,drawing phase off the block diagram diagnostics.Establish formulas motor condition diagnosis and screw shaft system efficiency for subsequent software open hair lay the foundation and provide the conditions. Based on the above theoretical research on the environment under Windows xp application Visual Basic6.0 developed well prepared screw condition diagnostic software, in order to screw production wells condition diagnosis points analysis, the software easy to use, simple operation, will produce the tedious process of reducing the large number of calculations greatly improve work efficiency. Well screw condition after analysis supporting software development is complete, select the part of the screw pump wells were representative field application testing and effect analysis, subject to further validate the results of the practicality and feasibility, and actively applied to the scale actual production will eventually research achievements into productive forces.Classification of screw wellsOver all condition types into normal and fault types,according to the different parts of a failure,the fault types into wells pump failure,mal function rod and tubing failures.Condition type is subdivided into eight kinds, including:normal production wells, rod broken off,the swelling of the stator, the stator unglued,pump leakage,in sufficient for the fluid,high operating parameters,low operating parameters,wax tubing, tubing broken off, tubing leakage.Condense out,attached to the tubing,with time,when the tubing severe wax, the wax can clog the tubing on the entire oil flow channel,so that the rotating rod to increase the difficulty oft he process condensate production is gradually wax reduction processes,but because rod and condensate wax friction large motor loads increased dramatically,the current rise,even in the presence of the motor burn hazard.Tubing wax serious specific performance oil discharge capacity decreased,fluid level rise,resulting in decreased pump efficiency, while the current rise,due to the friction torque rod and wax great and uneven.Pump serious leakage.When the oil pump if the loss is serious,the pump stops pumping hold,will clearly see the wellhead pressure will continue to decline, falling faster,the pressure drops linearly with time(torque,beating).Screw stator swelling. In immersion well temperature and downhole fluid production, the stator rubber absorbs oil organic ingredients, gradually swelling, causing the rotor interference increases, then the output is normal, but the current is higher than normal fluid level. Due to the interference of the rotor so that the initial increase in torque, so the torque rod torque exceeds the upper limit of a reasonable range, can cause severe rotor locking, axial force normal.Fluid supply shortage.Due to the unique structure of the screw pump,if not enough work for the fluid occurs,will result in dry grinding between the rotor and the stator, resulting in overheating of the rubber stator burned;or because the screw pump inlet pressure is low(below the cavitation pressure),cavitation flow efficiency decreases power consumption increases.Lack of judgment primarily on the basis of the screw for the fluid Pump inlet pressure and oil flow to consider.Stator unglued. Screw rubber restricted temperatures. In general, the screw working temperature 300 350F. Screw not competent turn, unless a very short time, otherwise in the rotor and stator contact surface generates heat, may cause failure of the rubber screw pump, commonly referred to as rubber degumming, also known as aging. Stator unglued due to insufficient adhesion caused by the stator. When unglued, pump active torque is zero, light rod torque decreases greatly. In addition, due to take place after degumming irregular friction between fixed rotor torque rod will appear irregular fluctuations. Hydraulic pressure generated by the axial force is zero, so that the axial force rod below the normal range, but still higher than the post in the produced fluid in weight.ConclusionFor screw pump oil production system with small size, light weight, simple structure,convenient ground equipment management and maintenance,less investment, high pump efficiency, more and more attention, and in the oil industry has been promoted and used, especially in the high viscosity of the crude oil, sand extent in oil exploitation, screw pump has a unique advantage. At the same time,during the process of oil production, the use of screw pump is also different degrees of rod break-off, rod and tubing wear, the wear serious failure and parameter setting is not reasonable, the problem of low operating efficiency, therefore, in-depth study can improve the application level of screw pump well in fault diagnosis of screw pump to achieve maximum output, benefit with minimum input, to improve the efficiency of screw pump oil production system has important value.Reference1 Jose Gamboa,Aurelio Olivet.New Approach for Modeling Progressive Cavity PumpsPerformance.SPE 84137,20032 F.J.S.Alhanati,P.Skoczylas.PCP Axial Load:Theory and Lab Results.SPE 90153,20043