Barite Sag Potential Determination and Management in Iranian High Pressure Directional Wells with New Experimental Apparatus

Barite Sag Potential Determination and Management in Iranian High Pressure Directional Wells with New Experimental Apparatus

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Part of #Barite Sag Potential Determination and Management in Iranian High Pressure Directional Wells with New Experimental Apparatus# :

Publishing year : 2011

Conference : Third National Congress of Petroleum Engineering

Number of pages : 15

Abstract: Barite sag is the undesirable fluctuations in mud weight that occurs due to downhole settling of the weighting agent. Barite sag has been exacerbated by the increased frequency of high-angle wells with the associated increase in particle settling rate, which occurs in directional wells. Settling of weighing materials can lead to problems such as stuck pipe, lost circulation, well control difficulties and poor cement jobs. Since the high-pressure deviations of torque and drag are high in comparison with vertical wells, oil-based muds are used to reduce the friction factor. High mud weight drilling fluidpreparation with oil based mud increases solid content and may cause some problems, for this reason in some oilfields such as Iran waterbase mud is used inevitably. In this paper, after setting up an experimental apparatus, the effect of inclination is investigated and the critical range isdetermined in static condition. The main purpose of this work is to manage the barite uptake due to the use of new water-based drilling fluid formulations. It is seen that the barite sag potential decreased using these drilling fluids