When planning a well, it is important to take into account the type and size of solids likely to be encountered and whether or not weighting materials will be needed. These factors will determine the solids control equipment needed on the rig. The number and kinds of mechanical devices and how each is controlled during use will depend mostly on whether the mud is weighted or unweighted. It may be necessary to modify the tank arrangement and the rig solids control equipment - rather than accept it as is and later try to make it do the job - usually with poor results. Tank arrangements should be planned according to the regions discussed below:
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