Changes

If the equation for hydrostatic pressure is solved for mud weight (MW), then the equivalent mud weight can be calculated, which has several important wellsite applications. Solving for MW, the equation becomes

If the equation for hydrostatic pressure is solved for mud weight (MW), then the equivalent mud weight can be calculated, which has several important wellsite applications. Solving for MW, the equation becomes

:<math>\mbox{MW} = \mbox{P}/(0.052 \times \mbox{D})</math>

:<math>\mbox{MW} = \frac{\mbox{P}}{(0.052 \times \mbox{D})}</math>

''Example'': Assume a formation at [[depth::10,000 ft]] has a known hydrostatic pressure of 6292 psi. The mud weight needed to drill this formation “balanced” (hydrostatic pressure equal to formation pressure) is calculated as follows:

''Example'': Assume a formation at [[depth::10,000 ft]] has a known hydrostatic pressure of 6292 psi. The mud weight needed to drill this formation “balanced” (hydrostatic pressure equal to formation pressure) is calculated as follows:

:<math>\mbox{MW} = 6292/(0.052 \times 10{,}000) = 12.1 \mbox{ ppg}</math>

:<math>\mbox{MW} = \frac{6292}{(0.052 \times 10{,}000)} = 12.1 \mbox{ ppg}</math>

===Kill weight of mud===

===Kill weight of mud===