Definition - What does Mud Gradient mean?
Mud Gradient is the pressure exerted in the depth because of the density added by drilling fluids. Mud weight is of sheer importance for the safety of the drilling activities. The Mud Gradient is required to be controlled at a programmed value or at the value that is determined by the Drilling Superintendent. The controlled gradient ensures the integrity of the hole and also the safety of the person on the board of the rig. It is commonly measured in bars per meter or pounds per square inch. It is also known as pressure gradient.
Petropedia explains Mud Gradient
Mud Gradient is the change noticed in the pressure per unit depth in the units of kPa/m or psi/ft. The pressure increases with the depth in the areas that have normal pressure. The gradient differs from one area to another but is considered as 0.465-0.468 psi/ft., along the United States Gulf Coast. This is a pressure developed by salt water that is naturally occurring in formations of the area. It can refer to the change in the pore pressure with the distance from well to the change with the depth or to the change in borehole fluid pressure with the depth.