Optimization Design And Performance Simulation Of Spiral Cam Pumping Unit

Pumping unit lift is most important in oil field. Beam pumping unit was widely used in China's oil field, at present, the total number of beam pumping unit wells has been over 200,000, accounting for over 90% of the total number of wells in oil field. As a large number of low-permeability oil fields placing on production, the number of low volume wells below 5 t/d and ultra low volume wells below 2 t/d were shaply increased. For beam pumping unit, erer if the minimum impulse times can not meet the requirements of low volume wells, as a result, most of the low volume wells were work under serious shortage of liquid conditions, resulting in unnecessary wear and tear of equipment and a lot of waste of energy. Most of the present beam-unit have some practical problems, such as high cost, low reliability, low transmission efficiency, high energy consumption and so on. Therefore, to develop a new type of low impulse times pumping unit has important theoretical and practical significance. This paper carried out the following tasks:(1)Selected spiral cam as the reverse mechanism and cycolid gear box as the deceleration devices of the new pumping unit, determined the design of a new pumping unit. The new pumping unit has the following advantages: Simple structure, reliable reverse; High efficiency of ground transmission equipment, energy-saving effect is good; In the middle part of the stroke uniform pumping can significantly improve the performance of entire equipment;(2)The simulation model of kinetic characteristic of suspension center of (displacement, velocity, acceleration), sucker rod string vibration, polished rod load, output shaft torque of reducer casing and input power of electromotor was established, It provides a theoretical basis for dynamics simulation evaluation and organization optimization;(3)Application of a single parametric surface theory, the calculation model of spiral cam profile surface equation, a pressure angle and principal curvature were set up. At the same time, seted up a mathematical model of optimal design of the spiral cam's geometric parameters;(4)Created a strength calculation method of main parts of the new type of pumping unit, completed a new pumping unit design and three-dimensional modeling;(5)Using Visual Basic 6.0, empoldered the "Movement and dynamic performance simulation software of spiral cam pumping unit". Compared with conventional pumping unit, the result show that, the new pumping unit has a good dynamic performance, energy-saving effect is obvious, can meet the requirement of low impulse times, high efficiency of low-permeability oil fields.