Indirect measurement system for identifying the position, density and pressure of an underground liquid or gaseous interface

A measuring system for determining a position or height (h), density (ρ) and pressure of an underground liquid or gaseous/liquid interface of a gas well or gas reservoir or pressurized tank, comprising:

• an instrument panel (10) for measuring data parameters of said underground liquid or gaseous/liquid interface or gas reservoir or pressurized tank in real-time;
• said instrument panel (10) comprising:
• a fluid input (12) for receiving gas or liquid;
• a pressure regulator (14) connectable to the fluid input (12) for regulating a pressure of the fluid input (12) to produce a pressure regulated fluid;
• a hydrostatic tube output (24) operationally connectable to the pressure regulator (14) for injecting an inlet pressure regulated fluid at an inlet pressure (P1) into said underground liquid or gas reservoir or pressurized tank;
• a static tube output (26) operationally connectable to the pressure regulator (14) for injecting an outlet pressure regulated fluid at an outlet pressure (P2) into said underground liquid or gas reservoir or pressurized tank;
• a multivariable transmitter (20) operationally connectable to the hydrostatic tube output (24) and the static tube output (26) for measuring the data parameters;
• a first flow controller (16) with first rotameter (17) operatively connected to the pressure regulator (14) for regulating a first flow rate of the fluid that is injectable into the static tube output (26);
• and
• a second flow controller (18) with second rotameter (19) operatively connected to the pressure regulator (14) for regulating a second flow rate of the fluid that is injectable into the hydrostatic tube output (24);
• a control panel (30) operatively connectable to the instrument panel (10) for collecting the data parameters in real-time from the instrument panel (10);
• and
• a correction algorithm configured to receive the data parameters and to determine the position, density and pressure of the underground liquid or gaseous/liquid interface or gas reservoir or pressurized tank so as to increase measurement accuracy thereof.