Field data demonstrate improved mud removal techniques lead to successful cement jobsField data demonstrate improved mud removal techniques lead to successful cement jobs Peer-Reviewed Journal Publication Δημοσίευση σε Περιοδικό με Κριτές 2015-10-291996enDownhole zonal isolation requires the efficient removal of mud from the annulus and its replacement by competent cement. While good cementing practices have been developed over the years the results are not always satisfactory mainly because the techniques for mud removal are not optimized. Improved mud removal techniques have recently been developed which take into account quantitatively most of the parameters affecting mud displacement and cement placement. Application of these techniques has lead to considerable successes in the field. This paper provides further evidence of the effectiveness of these techniques by presenting the results of a field campaign.Δημοσίευση σε επιστημονικό περιοδικό http://creativecommons.org/licenses/by/4.0/SPE Advanced Technology Series4153-58 Kelesidis Vasilis Κελεσιδης Βασιλειος Guillot D. J. Rafferty R. Borriello G. Merlo A. Society of Petroleum Engineers Downhole zonal isolation