BALANCE OF SUCKER ROD PUMP UNITS BASED ON ANALYSIS OF WATTMETROGRAMS

Abstract

The relevance. A significant part of the oil production wells in our country is operated by sucker rod pumping units. Low-speed asynchronous electric motors with increased starting torque are used as drives for sucker rod pumping units. Electric motors of such units operate in underloaded modes with cyclically varying load. Such modes negatively affect both the operation of the electric motors themselves and the electrical network. The energy characteristics of the motors, such as efficiency and power factor, are impaired. The balancing of the sucker rod pump units by adjusting the counterweight weights allows the load to be made more uniform, improving the drive modes and reducing power consumption. However, it is rather difficult to assess the balance of operating units, since wells are usually not equipped with sensors for measuring wattmeter cards and assessing balance. In the fields, balancing is often carried out using conventional multimeters with current clamps. Therefore, it is important to assess the balance of the wells of the operating stock and the resulting excessive consumption of electricity. The main aim of the research is to explore the downhole pumping systems existing fund in terms of balance; determine what part of the fund of downhole pumping units is balanced, what unbalance coefficient other wells have; evaluate the influence of the balance of sucker rod pump units on electricity consumption; draw conclusions about the excessive consumption of electricity as a result of insufficient balance. Objects: oil producing wells, borehole sucker rod pumping units, asynchronous electric drives. Methods: statistical analysis of wattmeter cards; mathematical methods for analyzing wattmeter cards with determining the average value of power consumption, the coefficient of imbalance, and the potential for energy saving. Results. It was found that only 2 % of borehole pumping units can be considered balanced. At the same time, 35 % of borehole pumping units have an unbalance coefficient worse than 0,5. The negative effect of insufficient balancing of sucker rod pumps on power consumption is shown. As a result of rebalancing, the energy consumption of borehole pump drives can be reduced by more than 2 times while maintaining production volumes.

Keywords

• oil production well
• sucker rod pump unit
• asynchronous electric drive
• wattmeter card
• balancing
• energy consumption