| Workover rig is the specialized machinery used for repairing well pipe column or well, mainly used for tubing, sucker rod and pump up and down. Conventional workover rig used diesel engine as power, running and working operation used one set of dynamical system, vehicle diesel engine and hydraulic transmission box. Large tonnage workover rig adopts double vehicle diesel engine, in order to ensure greater output power. Small tonnage workover rig takes full power of vehicle diesel engine, with a torque converter, mechanical transmission or a pure mechanical transmission box. Control system adopts the traditional liquid, gas, electric control mode.Electric energy is clean, environmental protection, efficient,so it has been widely used in various industries. The power of workover rig is changing from oil to electric energy. Petroleum machinery factory have two solutions, one is high voltage power supply connected to large power transformers, but it need professional wireman to reconnect after moving, and it need to stop providing electricity. This method restricts the use of the products, increases the cost, and at the same time effects on the use of nearby pumping unit at the same high pressure. The other method is to limit hook speed according to the condition of wellsite power. If the field transformer capacity is too small, the workover rig can't work. It increases of operations time and cost, and limits the operation environment. Truck mounted electrical workover rig is poor applicability, high requirement of wellsite power. These two kinds of methods can not use in a large-scale.UPS is a mature temporary supplementary power widely used in the area with large power fluctuations. The principle is AC unstable electricity changed by the rectifier filter into the direct current, and then transformed into chemical energy stored in storage battery. The user used is alternating current. City electrical interference, high harmonics and other factors can not affect the use of the electric appliance, and the electric supply with the battery when the city electrical is failure to ensure electrical appliance normal shutdown or stored data.AC-DC-AC frequency conversion control system is AC - DC - AC control system. Alternating current converted into direct current by rectified and filtered. The direct current converted into controllable frequency alternating current by the PWM modulation module and control module. The alternating current can be used to control motor speed and torque, and then control the output power of the motor.AC-DC-AC frequency conversion control system and UPS power is both the technology can realized AC - DC - AC process, the final result is different, one is controllable frequency alternating current, the other is power frequency alternating current. If increased the capacity of battery, battery and power supply at the same time can solved the power supply shortage situation in a short time.Zhongcheng equipment manufacturing company, Qinghai oil field downhole operation company and Shanghai lipu energy technology limited company joint research project "XJ250DB Electrical Workover Rig". According to GB / T23505-2009 "Petroleum Drilling Rig and Workover Rig" choose the right motor, battery and control system supporting XJ250DB workover rig. Power supply compensation system composed by storage battery and control system is the main purpose of this project.XJ250DB electrical workover rig is equipped with motor, battery, control system, hydraulic system, pneumatic control system, mechanical structure, and the emergency facilities in order to meet the requirement of HSE.Through factory test and site test to prove that if the workover rig can meet the field operation requirements, and then proved that if the power supply can effectively solve the matching problem of workover rig and wellsite power.The main purpose of researching the power compensation system is to realize workover rig's main power changed from diesel to electricity. If the plan can achieve the desired results according to the field test, it can be widely used in the petroleum machine manufacturing industry. |
