AUTOMATIC LIQUID LEVEL MONITOR

摘要

Apparatus for determining the location of the liquid surface in a well or bore hole has a source of acoustic pressure pulses coupled to the surface casing so that they are transmitted down the well and reflected by the gasliquid interface. A transducer is also coupled to the well to produce an electrical signal in response to direct and reflected acoustic pulses occurring in the well. A clock pulse source is provided together with a pulse counter for producing one pulse output for a certain number of input pulses and having its input connected to the clock pulse source to apply the clock pulses as input pulses. The pulse counter is connected to a calibrating device capable of adjusting the number of input pulses required to produce a single output pulse. Gating circuitry responds to the transducer for starting and stopping the counting of clock pulses by a digital counter and a digital read out device is utilized to indicate the depth to be liquid level in the well. The source of acoustic pulses is actuated automatically at predetermined times, and the depth to the liquid level and the time are recorded automatically. The monitor can be used to control the operation of a pump in the well.