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The oilfield workover rig is important in the process of oilfield equipment . Traditional workover rig driven by a diesel engine . Diesel engine efficiency is low , the transmission efficiency of the transmission device is low , and there is oil leakage , contamination, and maintenance problems . AC variable speed system has a wide speed range , speed smooth and convenient , safe and reliable, energy saving and so on merit , in recent years, a large proportion of the oilfield workover rig . Workover rig load is gradually reduced , and only the first time upgrading a few moments require large torque , after the need to increase the speed . If the motor is running at constant torque speed segment , you need to design a high power level , resulting in a waste of electrical power , and the volume . Followed by the operator is required to have some experience and quality at any time to adjust the speed so as not to exceed the power limit . In order to solve the above problems , the subject of a new type of intelligent control system based on the constant power control of the programmable controller and inverter bus communication . The oilfield workover process load is gradually reduced , which is basically the same, so make sure that the system is controlled motor for constant power speed control with constant power speed characteristics of the motor above the fundamental frequency . This topic on the electrical control part of the workover system new design, including the design of the main circuit and control circuit design, using a programmable controller as the control , the preparation of the entire system control program , by PLC and inverter communication also change according to the load automatically Analyzing reasonable operating speed , and is equipped with safety measures to protect the motor does not exceed the power limit value , will greatly improve the safety and reliability of the workover , and the operating efficiency of the control of the main motor improvement will reduce the dependence of the quality and experience of the operator . Meanwhile , in order to adapt to the different operators , the system retains the traditional manual control mode , the use of the system is becoming more humanized . Through a series of experiments to verify the feasibility and advantages of the system , the system has been successfully used in Liaohe oilfield workover . And applicable to a wide range of oilfield workover work process similar to that for the first time lifting require a larger torque upgrade process requires less torque , but the need to increase the speed to reduce the operating time of lifting equipment .
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