Analysis on the Efficiency of the Lifting System of Submersible Electric Pump Well in Chengdao Oilfield

Analysis of Potential Efficiency of Submersible Electric Pump Well Boosting System in Chengdao Oilfield Liang Limin (Guodong Shengli Oilfield Co., Ltd., Gudong Oil Production Plant, Dongying 257237, Shandong, China) Starting from the pump depth and other aspects, the power loss of each part of submersible electric pump was calculated and compared. Some of the power and changes in the efficiency of the electric pump oil extraction system have identified the potential for energy saving and consumption reduction, and put forward optimization solutions that can improve system efficiency and reduce energy consumption.

1 Problems The current submersible electric pump has become a major oil production method in the Yudao Oilfield. There are 186 electric pump production wells and 167 open wells in the Yeouido oil field. The daily production of oil is 4790.7t, and the comprehensive water content is 36.9%. The electric pump displacement is mainly 45~80m3/d. According to the calculation of the average single well power consumption of 1 359.2kWh average power consumption of 3tons of tons of liquid 34.9kWh average system efficiency of 12.1%. Calculated according to the empirical formula 111, the current average operating power of 18 submersible electric pump wells is only 5.60kW. The average power consumed by the tubing friction is 5.12kW; the average loss power of the cable is 9.10kW; the average loss power of the ground equipment is 1.40kW. The average input power of the submersible pump well is 36.10kW. Most of the energy is consumed in the submersible motor itself. The efficiency of submersible motors is very low, and the average motor efficiency is only compared with conventional onshore rod pump oil wells. Electric pump wells consume high power, and each pumping well is equivalent to the power consumption of 5 pumping wells (pumping wells The average daily power consumption of a single well is 255kW.h), which has a great potential for electricity saving. Therefore, reducing the power consumption of electric pump production wells and improving the system efficiency has become an important way to reduce the cost of electric pump oil production.

2 Main factors affecting the efficiency of electric pump well system 2.1 Influence of submersible pump depth of submersible electric pump The depth of the submerged pump well pump has a great influence on the power loss of the submersible cable and the power loss of the tubing pressure head. The greater the depth of the lower pump, the greater the power loss of the submersible cable and the power loss of the tubing head. The statistical results of the 18-well electric pump well are shown in Table 1. Relationship between pump depth and cable loss power by pipe No. of port No. of pumping depth/system efficiency, cable loss power/kW tubing head loss power/kWZ daily power consumption/(kW . Ton of liquid power / (kW.h) The average oil and gas exploration in Qingqing Petroleum Technical College is now engaged in the comparative calculation of the offshore oil field rate and the ton liquid power consumption and the test of the liquid energy and touch the lungs, technical supervision touch. Tel micro-6-Qing 8;fww.Cnki.net 2.2 The impact of the supporting motor power Currently, most of the submersible motors used in the submersible pump wells in the Yudao Oilfield are 45, 60, 70, 80, 100kW series motors. The number of knots is 2 and 4 and the head length is 1 000~2000m. There is a general phenomenon that the motor power is too large.The average effective power of the 18 electric pump well motors currently surveyed is only 5.6 kW, and the average system efficiency is only 12.81%. low.

The input power of the submersible motor and the input power of the active power motor are relatively large. The higher the input power, the lower the motor efficiency and the higher the power consumption of the ton liquid.

2.3 The impact of the head size of the submersible electric pump unit The size of the lift of the submersible electric pump unit is related to the number of stages of the electric pump. The higher the number of stages of the electric pump, the higher the lift, and the higher the power consumed by lifting the liquid. According to the statistical results, the current electric pump well displacement is 45~80m3, and the number of sections is mostly 2 pumps. The average head lift is 1800m, the average ton liquid power consumption is 29.91kWh; when the electric pump downhole number is 3, the average is Head 3000m, the average power consumption of 47.05kWh tons of liquid. Therefore, in the matching of the electric pump unit, should be based on the depth of the pump to match the appropriate number of stages of the electric pump to minimize head.

2.4 Pump inlet pressure is too high or too low. Average well pump inlet pressure is up to 7.5 MPa. Pump inlet pressure is high. Although beneficial for well production, excessive pump inlet pressure causes loss of tubing pressure head and power cable. Big. 18 wells statistics: 10 wells with pump inlet pressure greater than 7.0 MPa and pump inlet pressure of 2.0~5. Wells, power cable power loss higher than 1. 04kW, two loss power conversion daily power consumption The quantity is higher than the 121. 3 measures that should be taken. Beijing: Petroleum Industry Press, 1992.60~802 Huang Xiao, Shi Buqian, Fan Xiqun. Electric pump well optimization design and working conditions diagnosis technology editor: Li Jinhua

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