The effect of back pressure on pump efficiency of pump

[Asian pump network] the impact of energy and environmental pressure on the pumping pump pumping efficiency Daqing Oilfield Company Limited, the first oil production plant No. 6 oil Wei Xu Qing and ground pipeline using a simplified design process (ring, tree flow). Oil recovery wells due to the viscosity of the crude oil viscosity increases, the pipe diameter becomes thinner 厍 due to rising, a lot of mining and the average return pressure rose from the original 0.3MPa (UMpa-0.9MPa. In the actual production of our It was found that the oil return pressure had a great influence on the oil production volume and the single well liquid production decreased obviously when the back pressure increased.And in the past the theoretical formula of pumping efficiency has never considered the factor of back pressure.In order to find out theoretically Back pressure and loss of calculation of the loss relationship, we analyzed by the pump loss in all aspects, come back to the theoretical calculation of the relationship between back pressure and loss of fruit effect.High back pressure on the pump pumping efficiency through the pump Working principle We know that the pump main pump loss due to the following three points: 1, stroke loss .2, loss of loss .3, full of factors. Pump leakage t mainly include: live cold and the gap between the pump loss, swimming The loss of Versailles, the loss of fixed Versail Leak, the loss of Versailleau, and the failure of Versailles T to correlate with the physical properties of crude oil, so the back pressure is not taken into account for the loss of Versailles. Calculate the public : = (1) q-pump gap leakage M, cm3 / s v-object kinematic viscosity, cm3 / sI-piston length, m g-policy acceleration, cm / s2e- radial clearance, cmVP- piston speed , Cm / s calculated in il, only the parameters A / and back pressure related back pressure tip plus a small increase in liquid pressure on the piston h end, the liquid density in the well is approximately as lxl (Tkg / m3, back pressure for each increase lMPa, equivalent to increase the liquid column 100m. That is, the parameter AH increased by 100 meters. So the back pressure will increase the pump leakage gap increased ft. Suppose kh for the back pressure, the competition MPa, gap leakage t with back pressure change relationship Expressed as: increased pressure, and increased loss of leakage pump efficiency loss is: through the formula, you can quantitatively calculate the back pressure and pump N gap leakage relationship.But due to the gap leakage 81 and live cold and pump Jane gap , So it will increase with time as the gap increases.2.However, the coefficient of fullness is mainly related to the liquid supply capacity at the end of the supply capacity, and has nothing to do with the back pressure. , The impact of back pressure on the loss of stroke, the stroke loss is calculated as: - flushing loss carry on, m the calculated In il considered sucker rod deformation process does not take into account the pressure on the pole I load, and in the grapefruit oil machine and the actual process of T., back pressure on the rod load is an impact on the stroke of its role The force on the piston: f = Kh (fp-, and this force will increase the elastic deformation of the rod ft, that is, to increase the stroke loss. In the process of the next stroke back to the role of liquid on the force does not affect the live on the cold so Sucker rod deformation has no effect.So the back pressure increases H is to increase the elastic deformation of the sucker rod during the stroke on the f.Elastic deformation of the tubing in the up and down process is mainly the liquid column gravity load, and thus has nothing to do with the back pressure, So the back pressure increases and tubing elastic deformation: t off, which can be drawn back to consider the effect of pressure loss after stroke calculation formula should be due to N pressure increases to increase the stroke loss and pump efficiency loss caused by: the case described, Back pressure increases mainly by increasing the stroke loss and the gap loss increases the pump pumping loss, back pressure caused by pump loss t can be calculated by the following formula: