A workover is the process of maintaining, repairing or enhancing production from a well through various means such as Drilling Rigs, Drilling Equipment Rental & Services, Dedicated Workover Services, Tubular Handling Equipment & Running Services, Oilfield Fishing Equipment & Services, Coring Equipment & Services, Borehole Survey / Gyro Survey Equipment & Services, Drilling/Completion Fluid & Services, Drilling/Completion Fluid Filtration Equipment & Services, Cementing Equipment & Services, Well Directional Drilling Equipment & Services, Measurement While Drilling & Services, Mud Logging; Electric Logging & Services, Well Testing Equipment & Services, Liner Hanger Equipment & Services, Well Perforation Equipment & Services, Sand Control Equipment & Services, Well Completion Equipment & Services, Tubular and Drill String Maintenance, Wellhead / Christmas Tree Equipment & Services, Slickline Equipment & Services, Specialized Drilling/Workover Services, Drilling Waste Management, Well Stimulation/Enhancement Services, Pipe Threading, Rig Inspection Services, Crude Oil / Condensate, Drilling jars & Other Down Hole Drilling. Most workovers require the production tubing string to be pulled from the well by the workover rig in order to repair the defects that may be causing sub-optimal well production. The production tubing is inserted back into the well once the defects have been repaired. In some cases, a workover is performed in order to carry out hydrofracking and acidizing.