abstract:Pore pressure gradient is a dimensional petrophysical term used by drilling engineers during the design of drilling programs for drilling (constructing) oil and gas wells into the earth. It is the pressure gradient inside the pore space of the rock column from the surface of the ground down to total depth (TD), as compared to the pressure gradient of seawater in deep water.
Second, the stateofinter-aggregateporewater of cohesivesoil is determined by(balanced) conditionbetween damping of bound water membraneandpermeabilitypressureofhydraulicgradient.