Design and Development of Multi-mode Control System for Beam Pumping Unit

In order to deal with the complicated and variable working conditions in the production process of the pumping unit, a multi-mode control system of the beam pumping unit is designed. By obtaining the electrical parameters and position information of the pumping unit, the developed system realizes multiple pumping unit operation modes like the constant speed mode, different speed between upper stroke and lower stroke mode and power servo mode by the frequency conversion technology. Combined with the development of the host computer software, real-time display and storage of the status information of pumping unit has been achieved. The field test showed that the multi-mode control system can effectively eliminate the current shock caused by the start of the pumping unit. A test well operated under the power servo mode has achieved the comprehensive energy saving rate of 10.4%. By changing the operation mode of oil well, the multi-mode control system can realize efficient, stable and economical operation of the pumping unit under several complicated working conditions, presenting high application value.