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The Ethics Of Drilling Mud

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5. The functions of drilling mud, and how their properties are modified to suit downhole conditions Discussion of the problems the mud engineer has in selecting a mud for a HPHT well. Introduction The drilling mud plays a critical role in any successful drilling operation. It must be carefully optimised and managed to ensure the safety of the drilling operation and to minimise hole problems. A failure in the mud design can lead to significant losses in terms of time and cost as a result of problems such as stuckpipe, kicks and blowouts. Depending on the continuous phase, drilling mud can be classified into water-based and oil-based. Drilling mud has the following functions: i. The drilling mud is used in controlling the hydrostatic pressure by keeping it higher that the formation pressure. ii. The mud is used to extract cuttings from the hole. The effectiveness of this function is contingent on the yield point (YP) property of the mud. iii. A lot of heat is generated during drilling due to friction and the mud works to cool and also lubricate the drill bit and drillpipe iv. To keep the integrity of the hold by preventing caving. The drilling mud forms a mud cake on the walls of the formation which stabilises it. v. Helps to release the drilled cuttings at the surface vi. Help minimise formation damage by maintaining a low fluid loss into the formation vii. Assisting in formation evaluation viii. Keeps cuttings in suspension when circulation has stopped The properties of

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