Matching Of Oil Well Supply Capacity And Drainage Pump Pumping Capacity

Feb 10, 2025

(1) Based on the IPR curve of the sewage pump, obtain the relationship between the bottomhole pressure of the oil well and the liquid production of the oil well. Based on the given liquid production rate, use the calculated IPR curve of the oil well to calculate the bottomhole flowing pressure at the selected liquid production rate. Starting from the bottom of the well, gradually calculate upwards, and use the Orkiszewski method to calculate the pressure drop inside the pipe, in order to obtain the relationship between the pressure in the oil well and the depth of the well; Starting from the wellhead and using the wellhead backpressure as the initial value, gradually calculate downwards to obtain the relationship between pressure and well depth, thus determining a set of pump depths and corresponding pump inlet and outlet pressures.
(2) Based on the characteristic curve of the pump and the pressure difference between the inlet and outlet of the pump, the theoretical displacement of the pump is obtained. Using parameters such as pump population pressure, population temperature, crude oil properties, gas oil ratio, and water content, the free gas content at the pump population is calculated. The decrease in pump efficiency due to the presence of free gas can be obtained, and then the impact of dissolved gas on pump efficiency can be calculated; Calculate the actual displacement of the pump based on the calculated efficiency and the theoretical displacement of the pump.
The pumping displacement of the pump should be less than the theoretical displacement. When the suction pressure of the pump is lower than the saturation pressure of the crude oil, the free gas released occupies a certain volume in the sewage pump; When the elastic deformation of oil pipes and rods, liquid leakage, and the degree of liquid filling in the pump barrel, as well as the difference in liquid volume between the formation and the ground, all reduce the volumetric efficiency of the pump.
When the suction pressure of the pump is lower than the saturation pressure of the crude oil, the free gas released from the crude oil occupies a certain space in the sewage pump chamber, which reduces the volumetric efficiency of the liquid. This can be described as the numerator term being the volume of the liquid (oil, water), and the denominator term being the sum of the volumes of oil, gas, and water. It represents the volumetric efficiency of ground liquid.
(3) Based on the liquid production rate of the oil well and the displacement per revolution of the pump, the rotational speed that the pump should have at this pumping depth can be obtained. The output power of the pump can be calculated based on the pressure difference between the inlet and outlet of the pump and the liquid production.
(4) Based on the physical parameters of the well fluid, pump speed, rod structure, pipe structure, wellbore structure, pump inlet and outlet pressure difference, and liquid production rate, the speed and torque of the input torque oil pump can be calculated, and the input power of the pump can be calculated.
(5) Compare the system efficiency, calculate the maximum system efficiency, record the pump's displacement per revolution, stages, speed, pump depth, pump inlet and outlet pressure, bottomhole flow pressure, daily liquid production, oil recovery index, system efficiency and other parameters as the final design result.