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Unformatted text preview: also keeps the drill bit cool and clean during drilling, carries drilled cuttings out of the well and suspends the drill cuttings whenever drilling is paused. Operators have multiple options for the type of mud to use during the drilling of a well, including oil‐based mud, synthetic oil‐based mud and water‐ based mud. Depending on reservoir conditions, operators assess which mud type is most appropriate for the specific well being drilled. For the Macondo well, BP chose a synthetic oil‐based invert mud system, a system in which synthetic oil in the mud remains in a continuous fluid phase in the lower hole sections of the well. BP chose this system for several reasons: (1) to enhance the ability to maintain consistent fluid properties independent of the temperature and pressure conditions of the well; (2) to improve hole cleaning and minimize barite sag, control of pressure spikes, and gaining gel strengths; 71 and (3) to deal with other problems that result when balancing equivalent circula...
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This note was uploaded on 01/18/2014 for the course BEPP 305 taught by Professor Nini during the Fall '11 term at UPenn.

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