Study on Reasonable Selection Process of Submersible Electric Pump

Model Low-displacement efficiency Average/% Proportion/% High-displacement efficiency Average/% Proportion/% High-efficiency Displacement efficiency Average/% Ratio 7% of the well. Four pump types The relationship between oil wells and displacement efficiency can be seen in the submersible pump as an important mechanical oil recovery equipment, which occupies a considerable proportion of the various pump types used in oil field development, but there are still some problems in well selection and pump selection. It is often the case that the pump deviates from the high efficiency zone and does not work under the ideal operating point. Even if the pump's displacement efficiency 111 is high, the unit's system efficiency is still low and energy consumption is high. Therefore, according to the production capacity of oil wells, reasonable and accurate selection of generating units is of great significance to production and energy saving. 2-31.1 The current status of electric submersible pumps is a statistical analysis of the actual discharge efficiency of the four pump types in Daqing Oilfield. Table 1). 1752 wells were accounted for, accounting for 716% of the total number of oilfield submersible electric pumps (ESP). The overall average discharge efficiency was 9Q46%. The wells operating in the low-displacement efficiency zone accounted for 42 2% of the statistical wells, operating in the high-efficiency zone. Internal design and development and applied research work-E-mail: Dong Zhengang et al.: Research on the rational selection process of submersible electric pumps book1 / 疳 犟牝 犟牝 犟牝 犟牝 犟牝 犟牝 效率 效率 % 11 11 11 11 11 11 11 11 11 11 11 11 11 11 11 11 11 11 11 11 11 11 11 11 Because of the influence of polymer and ASP flooding on centrifugal pumps, the ratio of low-emission efficiency wells is large. Among the 17S wells counted in the statistics, there are 739 low-efficiency efficiency wells with an average efficiency of 5829%. The lowest one-well efficiency is only 267%, greatly affecting the production of wells. Calculate the annual cumulative displacement difference according to the allowable minimum displacement in the high-efficiency zone to reach 1145 Table 2 Low-displacement efficiency in the four types of pumps in Daqing Oilfield Output loss analysis results Model displacement efficiency average/% of the number of wells and the minimum displacement of the high-efficiency zone /(m3-d1) Cumulative difference / For low-efficiency efficiency wells, Daqing Oilfield has adopted a 4'S-based approach with a wide flow channel mixed-flow pump in recent years. After small batch applications, some wells have seen significant results (Table 3).

12 High-displacement efficiency unit's impact on energy consumption Although the ratio of oil wells with high displacement efficiency is small, the energy loss per well is very large (Table 4). When the displacement efficiency reaches 150%, the pump efficiency decreases more obviously. For example, the difference between the Q20 pump and the highest efficiency point is 19%. According to the efficiency range defined by the 5% reduction in pump efficiency, the pump efficiency loss increases by 14%. When the displacement efficiency reaches 175%! Pump actual head drop Ishin displacement efficiency/% Table 3 Efficiency comparison between polymer flooding before and after taking measures Well Nominal Displacement/Discharge Efficiency/% Measures After the previous measures, the lift capacity of 86% has been very small.

Among the 1,722 wells actually counted, there are 122 high-efficiency efficiency wells, and the average displacement efficiency is 15541%. The highest well displacement efficiency reaches 28612%. The load power loss calculated from the average displacement efficiency (table 5) Obviously, the cumulative loss of 122 wells calculated on a 365-day basis in a year is approximately 5X 106kW°h, and the annual average energy consumption loss per well is approximately 250,000 yuan.

2 The frequency conversion parameter of the submersible electric pump The frequency conversion parameter of the submersible electric pump Although the equipment is complex, the operation process is simple and can be realized only by changing the frequency. Generally use such as the frequency conversion supporting the head. Such as the head frequency conversion support is in the design of the entire frequency change interval, the pump head remains unchanged, through the frequency changes, adjust the pump row 11 table 4 displacement efficiency of 150% and 175% when the pump efficiency and head rate deviation rate model efficiency Difference in pump efficiency at i50%/Head % deviation/% Efficiency at i75% Displacement/Pump efficiency/% Pump efficiency difference/Head deviation/% Table 5 High-displacement efficiency and high energy consumption loss for four pump types in Daqing Oilfield Displacement Efficiency Zone Corresponds to Ideal Pump Type Number of Wells Discharge Efficiency / % Pump Head / Pump Efficiency / % Load Power / kW / Model Pump Efficiency / % Load Power / kW / -f Should be properly equipped with submersible electric pumps to reduce oil field production Energy consumption.

As the frequency conversion parameters can be used to appropriately increase the width of the pump's high-efficiency zone, the use of variable-frequency parameters for oil wells with relatively large capacity changes is very beneficial for energy saving and consumption reduction. 78. According to the basic characteristics of the pumps, the corresponding lift frequency conversion units correspond. The formula for the calculation of the boundary point of the high-efficiency zone is the single-stage lift of the leaf guide wheel at the power frequency displacement point, m; h' is the rated single-stage lift of the leaf guide wheel, and m. Table 6 lists the high-efficiency zones of the four types of pump frequency conversion. The range of calculations. After the inverter is used, the range of the pump's high-efficiency zone is wider than the power frequency, and in the high-efficiency zone, the pump's head remains unchanged, and the larger the unit's displacement, the lower the head's, and the lowering of the hydraulic fluid level, will not occur. Case.

Table 6 Four kinds of pump type variable frequency high-efficiency zone displacement model Power frequency high-efficiency zone displacement / frequency conversion high-efficiency zone displacement / But for the frequency conversion unit, not simply adding a frequency converter can increase the output. In the matching of motors, we must fully consider increasing the frequency load increase. For constant frequency inverter units, the load power and frequency of the pump and the output power and frequency of the motor have the following relationships: rate, kW; i is the pump displacement after the frequency conversion, m3/d; the pump displacement for the industrial frequency, m3/d Qi is the pump displacement of Qi to the power frequency, m3/d; n is the frequency conversion pump efficiency, n is the frequency frequency pump efficiency, i is the frequency conversion frequency, Hz; is the frequency frequency, Hz; Pi is the motor frequency conversion Output power, kW; for the motor power output power, kW. Output power increases faster. Therefore, in the matching, the motor must match the maximum load power. For the power frequency unit, since the motor is matched with the power point rated point load power, directly installing the frequency converter can not effectively increase the output. As long as the load power exceeds the output power of the motor, it loses the significance of further raising the frequency. When the frequency rises to exceed the intersection point a of the load power N and the motor output power P, the load power will be greater than the output power of the motor, and the motor will be overloaded. Therefore, for the power frequency unit, the pump is reduced by decreasing the frequency. Displacement can keep the pump running efficiently and reduce reactive losses.

Dong Zhengang et al.: Research on reasonable matching technology for submersible electric pumps bookmark3 For low-displacement efficiency units, the pump's displacement efficiency should be improved by improving the adaptability of submersible electric pumps.

For the high-displacement efficiency units, the pump type should be reasonably selected to ensure that the pump works in the high-efficiency area and energy consumption can be reduced.

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