BHP from the fluid level

Bottom hole pressure from the fluid level

BHP from the fluid level notations

Fluid level is the interface between the gas and liquid phases occurred in the annulus of the well.

Fluid level on the well is measured with the echometer and used to monitor the bottom hole pressure of the wells.

Math and Physics

The physics is based on the hydrostatics law:

$P=\frac{\rho g h}{101325}$