A cleanup job is flowing the well to eliminate all foreign fluid (mud filtrates, completion fluid, acid contaminated fluids and debris etc..), contained in the invaded zone and the wellbore so that representative reservoir fluids can be represented. Estimation of duration of cleanup job:

• A.BS&W 1% solids
• B. Salinity measurement of water if any: Water not coming from the formation BS&W must be less than 1% to consider clean up finished . If formation water is being produced there is no limit in BS&W to consider that clean up achieved.
• C. PH is 7 after acid job
• D. Stabilization of WHP and BHP
• E. Visual examination of the flare: white or gray smoke indicate the presence of water.
• F. At least the well bore volume has been produced: (tubing content and rathole content)
• G. Surface flow rate stabilization

The process of placing a column of heavy fluid into the wellbore in order to prevent the flow of reservoir fluids.

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