Completion and Workover Fluids

completion and workover fluids are specialized fluids used during well completion operations and remedial workover procedures.
•These fluids are designed to cause the least amount of damage to the production zone
–The potential for damage to the zone is greater during the completion of workover operation
•Completion fluids are placed across the chosen pay zone after the well has been drilled but prior to putting it on production.
•Workover fluids are used during remedial work in producing wells, usually as an attempt to enhance or prolong the economic life of the well
•Functions of a completions or workover fluid:
–Control subsurface pressures.
–Minimize formation damage.
–Maintain wellbore stability.
–Control fluid losses to the formation.
–Transport solids.
–Maintain stable fluid properties
.•Types of completions and workover fluids:
–Clear, solids-free brines.
•These are the most common
–Polymer-viscosifiedbrines with bridging/weighting agents.
–Other fluids: oil-base, water-base, converted muds, foam


..•Brines are usually selected based on the appropriate density required to control the well

.