The term "differential pressure" refers to fluid force per unit, measured in pounds per square inch (PSI) or a similar unit subtracted from a higher level of force per unit. This calculation could be taken for pressures inside and outside a pipe or simply in different places along a flow path. This calculation has applications in the drilling industry.
Measuring differential pressure along a line helps drilling professionals identify the precise point of a blockage or to determine whether reservoir fluids are about to start backing into a wellbore, which can interfere with drilling operations. Keeping an eye on pressure at various points along a fluid line is vital for operational safety.