Abstract: Oilfield water injection systems involve high pressure and large water volume, and most injection motors are high-power motors. However, the rated flow rate of oilfield water injection stations often does not match the actual flow rate, resulting in the motors operating at high energy consumption for extended periods. To address this issue, a variable frequency drive (VFD) is proposed to regulate the speed of the motors used in oilfield water injection pumps, achieving energy saving and consumption reduction. This article introduces the principle of the VFD system and compares it with the original system. The adoption of VFD control not only improves the efficiency of the water injection system and saves energy but also extends the service life of the motors and reduces maintenance workload and costs. Keywords: Oilfield water injection pump; VFD; Energy-saving renovation Oilfield water injection is one of the effective measures for most oilfields in China to maintain high and stable production. Because the Henan Oilfield is a fault-block oilfield, each block has a small water injection range, and the water injection volume needs frequent adjustments depending on the mining conditions. Most water injection stations suffer from a mismatch between rated and actual flow rates (generally, the rated flow rate is greater than the actual flow rate). Due to the high pressure and large volume of water injected into oilfields, the water injection motors are mostly high-power motors. These motors operate at high energy consumption for extended periods. Using a variable frequency drive (VFD) to regulate the speed of the motors in oilfield water injection pumps, thus achieving variable water volume control, is a very effective energy-saving measure. 1. Existing Flow Control Method Under normal circumstances, high-pressure water injection in oilfields uses gate valves to control and regulate flow and pressure. According to process requirements, prolonged low-volume operation is not permitted, otherwise, the pump's internal temperature will rise, causing cavitation and component burnout. In the past, a large reflux method was used to reduce the temperature rise, resulting in significant electricity consumption and substantial energy losses for the oilfield. [b][align=center]For more details, please click: Energy-Saving Application of Variable Frequency Drives in Oilfield Water Injection Pumps[/align][/b]