Effective removal of drilling muds and related solids from well bores has been a topic of major concern for several decades. Displacement of incompatible fluids such as drilling mud with solids free brine is a critical point during well operations. A clean efficient displacement is mandatory to maintain the brine and mud integrity, reduce filtration costs, reduce rig time and provide a solids free environment in the well. The net result – downhole operations become easier, faster, and more effective in clean fluids.
The displacement process is divided into two components:
Predisplacement – the mechanical and chemical conditioning of the mud before it is actually displaced.
Displacement – the actual removal of the mud from the well using appropriate spacers, chemical washes and technique.
Methods to analyze and compare displacements are proposed.