Oil muds can be diluted with base oil (or clean oil mud) and water muds can be diluted with water (or clean water mud) to keep the concentration and surface area of solids within bounds. Two approaches for dilution are:
The total costs of dilution are: the cost of the water hauled to the rig, the cost of converting that water into a mud of correct density, plus the cost of disposal of the mud that was dumped. To make dilution less expensive, these practices should be followed:
Therefore, as mud becomes more expensive, dilution becomes a less attractive option and mechanical separation should be pursued.
The equations needed to calculate the volume of mud to dump, the volume of water to add for dilution, and the volume of barite required for density are found in Section 2, Basic Engineering Calculations.
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