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In the oil industry, mud weight is the density of the drilling fluid and is normally measured in pounds per gallon (lb/gal) (ppg) or pound cubic feet (pcf) . [1] In the field it is measured using a mud scale or mud balance. Mud can weigh up to 22 or 23 ppg. A gallon of water typically weighs 8.33 pounds (or 7.48 ppg).
P = 0.052 * mud weight * true vertical depth. taught in almost all petroleum engineering courses worldwide, the mud weight (MW) is expressed in pounds per U.S. gallon, and the true vertical depth (TVD) is expressed in feet, and 0.052 is a commonly used conversion constant that can be derived by dimensional analysis:
In the oil industry, estimated pore pressure is measured in pounds per square inch (psi), but is converted to equivalent mud weight and measured in pounds per gallon (lb/gal) to more easily determine the amount of mud weight required to prevent the fluid or gas from escaping and causing a blowout or wellbore failure.
Drilling fluids also support portion of drill-string or casing through buoyancy. Suspend in drilling fluid, buoyed by force equal to weight (or density) of mud, so reducing hook load at derrick. Weight that derrick can support limited by mechanical capacity, increase depth so weight of drill-string and casing increase.
ppb – pounds per barrel; PPC – powered positioning caliper (Schlumberger dual-axis wireline caliper tool) [24] ppcf – pounds per cubic foot; PPD – pour point depressant; PPE – preferred pressure end; PPE – personal protective equipment; PPFG – pore pressure/fracture gradient; ppg – pounds per gallon; PPI – post production ...
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The principle of a well kill revolves around the influence of the weight of a fluid column and hence the pressure exerted at the wellbore's bottom. P = h g ρ {\displaystyle P=hg\rho } Where P is the pressure at a specific depth, h, within the column, g is the acceleration of gravity and ρ is the density of the fluid.
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