Lost circulation problem analysis and evaluation of the types of lost circulation materials and their placement techniques

Different methodologies are presented to resolve severe lost circulation problems in different field of Algeria, involving naturally fractured or cavernous formation. Lost circulation events in these formations are compared to lost circulation events that are caused by induced fracturing or by drilling through permeable zones having intergranular porosity with excessive mud density. Much progress has been made in the control of lost circulation of drilling fluids as a result of improvements in drilling fluids and drilling techniques, and the developments of new lost circulation materials and remedial procedures.