RU98121760A - METHOD FOR OPERATING A WELL WITH A SUBMERSIBLE CENTRIFUGAL PUMP AND A DEVICE FOR ITS IMPLEMENTATION - Google Patents

Claims (2)

1. A method of operating a well with a submersible centrifugal pump, providing for a preliminary determination of the technical parameters of the well, the pump unit and the power frequency converter, namely: the value of the static level H _{st of} fluid in the well, radius r _{t of} the tubing string, radius R ₁ and angle Log β ₁ on input pump wheel, the radius R _2, the exit angle β _2, and the width b of the pump wheel ₂ at the outlet of the impeller blades z, n number of impellers, pump efficiency coefficient η, slip s async Nogo engine law coherent frequency and amplitude of the voltage of the power converter feeding the drive motor of the submersible centrifugal pump, and comprising changing the frequency and the voltage amplitude of the power converter, characterized in that the set desired value of the dynamic level H _din.zh measured flow rate and the borehole vykide the frequency of the output voltage of the power converter, multiply the frequency of the voltage of the power converter by the proportionality coefficient

the result obtained is summed with the product of the current value of the well flow multiplied by the proportionality coefficient

the result of addition is multiplied by the proportionality coefficient K ₃ = -π · r $\genfrac{}{}{0ex}{}{\text{2}}{\text{t}}$ and get the first factor, determine the first time derivative of the well flow rate and get the second factor, multiply it by the first factor and get the first product, multiply the voltage frequency of the power converter by the first time derivative of the output signal of the adder and by the proportionality factor K ₄ = π · r $\genfrac{}{}{0ex}{}{\text{2}}{\text{t}}$ · K ₁ , subtract the result from the first product and get the output signal of the comparison device, multiply it by the proportionality coefficient

and integrated, put the value obtained with the value of H level static _item and the current value obtained dynamic _dyne level H in the well, it is compared with the desired value of the dynamic level H _din.zh determine the magnitude and sign of the deviation and convert it to the desired values of frequency and amplitude voltage power converter.  2. The device for implementing the method according to claim 1, comprising a submersible centrifugal pump, a controlled power frequency converter, the output of which is connected to the primary winding of the step-up power transformer, the secondary winding of which is connected via cable to the stator of the asynchronous squirrel-cage motor of the submersible pump, characterized in that the device additionally includes a flow sensor for the well, a unit for measuring the frequency of the voltage of the power converter, a unit for setting the static level in the wells , a setter of the desired value of the dynamic level in the well, a regulator, two interface devices, a comparison device, three adders, two multiplying units, an integrator, two differentiating units and five proportional links, the output of the setter of the desired value of the dynamic level of the well connected to the direct input of the first comparison device the output of which is connected to the input of the controller, the output of which is connected to the input of the frequency measuring unit and the input of the first interface device, the output of which is connected to the input controlled power frequency converter, the flow sensor of the well through a second interface device is connected to the input of the first differentiator and to the input of the second proportional link, the output of which is connected to the first input of the first adder, the output of the voltage frequency measuring unit of the power converter is connected to the first input of the second multiplier and the input of the first proportional link, the output of which is connected to the second input of the first adder, the output of the adder is connected to the input of the third o the proportional link, the output of which is connected to the first input of the first multiplier link, the output of which is connected to the direct input of the second adder, the output of which is connected to the input of the fifth proportional link and the input of the second differentiating link, the output of which is connected to the second input of the second multiplier, the output of which is connected with the input of the fourth proportional link, the output of which is connected to the inverse input of the second adder, the output of the fifth proportional link is connected to the input of the integrator, output before which is connected to the first input of the third adder, the second input of which is connected to the unit for setting the static level in the well, the output of the third adder is connected to the inverse input of the first comparison device.