Oil-base muds are composed of oil as the continuous phase, water as the dispersed phase, emulsifiers, wetting agents, and gellants. Other chemicals are used for oilbase mud treatment, such as degellants, filtrate reducers, and weighting agents.
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In selecting the most suitable type of drilling fluid, many different factors must be considered. Overall what is required is a mud system that gives the lowest overall cost of drilling each hole section, except for through the reservoir. The direct cost of the fluid itself (the cost per barrel of mud) is but one component of this overall cost. If serious hole problems occur because the mud was not optimized for the formations in an effort to “save money,” obviously much more money will be spent than would have been saved on the mud bill.
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Add some chemical components in oil based drilling fluid could optimize the performance of oil muds. The order of addition as listed below is the most common procedure for preparation of oil base muds, though each mud system may require some modification of this procedure.
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Gasified fluid drilling refers to the use of compressed air (or other gases) injected into an incompressible drilling fluid that flows in the annulus. This is accomplished by two basic methods.
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