Patent ID: 6085836
Filing Date: 2000-07-11
Classification: E21B,G01F

Abstract:
A method to set pump activate pump inactivate conditions, in a well containing a pumpable liquid, to pump the liquid comprising:transmitting a first continuous sonic signal at a first frequency to a well casing thereby creating a reflected well casing sonic signal;receiving the reflected well casing sonic signal from first sonic signal thereby generating data;transmitting a second continuous sonic signal at a second frequency, different than said first frequency, to a well tubing thereby creating a reflected well tubing sonic signal;receiving a reflected well tubing sonic signal from said second sonic signal thereby generating data;transmitting a third continuous sonic signal at a third frequency, different than said first frequency and different than said second frequency, to the well annulus;receiving a feflected well annulus sonic signal from said third sonic signal thereby generating data;utilizing at least one of the reflected signals corresponding to the transmitted signal to determine an initial liquid level P2 of the well from said data;pumping the liquid from the well until the well is at a no liquid pumpable state P0;utilizing at least one of the reflected signals corresponding to the transmitted signal to determine the no liquid pumpable state P0;storing said data generated from the reflected signal used at the no liquid pumpable state P0;storing said data generated from the corresponding transmitted signal at the initial liquid level P2 of the well;continuously monitoring the liquid level of the well and converting said data generated to activate the pump to pump the liquid at a liquid level less than or equal to the initial liquid level P2;continuously monitoring the liquid level of the well and converting said data generated to inactivate the pump at a liquid level P1 above the no liquid pumpable state P0;thereby activating the pump and inactivating the pump to pump the liquid.