For the design and management of the modern heavy oil piplines, the application of mathematical model to describe the characteristics of screw pump is crucial to the improvement of design quality and operational management efficiency. According to the features of HOW7T.3(50mm) screw pumprsquo;s actual measured data, this research established two groups of mathematical model.The first one described the change of screw pumprsquo;s displacement along with the variation of pressure difference and viscosity, while the second group described the change of shaft power along with the variation of pressure difference and viscosity, and then it solved all the four models by a particle swarm optimization (PSO) algorithm. The model-building and model-solving of these two examples showed that the PSO algorithm could rapidly search the best model regression parameter. Through the four target test, the research finally selected two models with relatively high accuracy. In the end, the paper put forward that it is necessary to take further research on the forms of screw pump characteristic mathematical model, and the corresponding optimization method of model-solving, in order to make the models more succinct and with higher fitting precision.
In this paper the vibration of a screw pump unit was studied. Firstly the modal of this pump unit was calculated, which was possible thank to the exact finite element model. And the exactness of the result was verified by comparing with the testing one. Based on the correct simulation modal, the load is identified using the experimental results, and the accuracy of the identification is confirmed using the response error. Combined the response spectrum, the load spectrum and the modal analysis results, the causes and control methods of the screw unitrsquo;s vibration are analyzed. Finally, according to the foregoing calculation results, the system is simulated and optimized. The identified load is loaded on the optimized structure. The responses calculated are compared with the original structure and the optimized results are evaluated.
Down-hole oil-water separation and reinjection in the same well system can reduce the cost of lifting the water and the ground pollution due to the treatment of production water, which can bring good economic and environmental benefits. By combining down-hole oil-water separation technology with surface driving single screw pump oil production technology, the author designed an innovative system of down-hole oil-water separation and reinjection in the same well. In this paper, the general structure, working principle and structure characteristics of the system are introduced. The structure composition and the connection method of each part are described, and the calculation method of basic parameters of the single screw pump in the system is given.
Twin screw vacuum pump is an important kind of dry vacuum pump, which is widely used in the oil-free vacuum system. The design of the screw rotor profile directly influences the working performance and manufacture cost of the screw pumps. In this paper, a new rotor profile for twin screw vacuum pump is introduced which is comprised of the cycloid curve, the dedendum circle arc, the involute curve and the addendum circle arc. The processes of three-dimensional modeling, motion simulation, interference checking and structural optimization for twin screw vacuum pumps are studied by means of Solidworks software. The works provide theoretical basis for optimal designing and reference for test prototype manufacturing. The results showed the performance of the vacuum pump according with the designerrsquo;s intention.
The stators and rotors of full metal screw pump take way of clearance fit, so the clearance value will directly affect the pump lifting performance and efficiency. Firstly using the finite volume method to establish a full-metal single screw pump 3D model, secondly using FLUENT software to calculate outlet pressure changes with different series of clearance value between the stator and the rotor of the pump in condition of the same inlet pressure .lastly Drawing outlet pressure change curves to evaluate the concrete effect of clearance volume on the performance of the pump. The results indicate that the pump outlet pressure increased first and then decreased with increasing clearance value and that pump has good lifting oil capacity with clearance value which is less than 0.5mm.
Through the establishment of contact element simulated the contact between sucker rod and oil pipe. The deformation of sucker rods in oil pipe that caused by the screw pump rotor eccentricity has been researched by the application of transient dynamics analysis. Results show that screw pump rotor eccentricity is one of the reasons which cause rod and oil pipe contact resulting in partial abrasion. Deformation of the sucker rods caused by the rotor eccentricity is mainly concentrated on the bottom of rods, so in order to mitigate partial abrasion, rod centralizer arrangement at the bottom of rods should be strengthened, or change the connection mode between the sucker rod and screw pump rotor to eliminate the effect of the sucker rod deformation caused by rotor eccentric motion.
对于现代稠油管道设计与管理、数学模型描述中的应用, 螺杆泵的特点是提高螺杆泵设计质量和运行管理效率的关键。根据how7t（50mm）的特点,3螺杆泵的实际测量数据，本研究建立了两类数学模型。第一个描述螺杆泵排量变化随着压力差和粘度的变化，而第二组描述轴功率随压差和粘度的变化，从而解决了所有的四个模型的粒子群优化（PSO）算法。这两个例子的建模和模型求解表明，PSO算法可以快速搜索最佳模型回归参数。通过四个目标的测试，研究最终选择了两个模型，具有较高的精度。最后提出了进一步研究螺杆泵特性数学模型的形式，以及相应的优化模型求解方法，使模型更简洁、拟合精度更高。
本文研究了螺杆泵机组的振动问题。首先，该泵单元的模态计算，这可能是由于确切的有限元模型。和结果的正确性是通过与试验对比验证。基于正确的仿真模型，负载被识别使用的实验结果，并确认使用的响应误差的识别的准确性。结合反应谱、载荷谱和模态分析结果，分析了螺杆机组振动产生的原因及控制方法。最后，根据前面的计算结果，对系统进行了仿真和优化。所确定的负载加载在优化结构上。计算的响应进行比较与原来的结构和优化的结果进行评估。
在同一井井下油水分离及回注系统可以减少提水和土壤的污染由于生产水处理成本，从而带来良好的经济效益和环境效益。通过井下油水分离技术与地面驱动单螺杆泵采油技术相结合，提出了在同一井井下油水分离及回注创新体系。介绍了该系统的总体结构、工作原理和结构特点。介绍了各部分的结构组成和连接方法，给出了系统中单螺杆泵基本参数的计算方法。
