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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).
One of the functions of drilling mud is to carry cuttings out of the hole. Source: [5] Drilling mud must suspend drill cuttings and weight materials under a wide range of conditions. Drill cuttings that settle can cause bridges and fill, which can cause stuck pipe and lost circulation.
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:
This mud type can be used as a completion and workover fluid, a spotting fluid to relieve a stuck pipe and as packer or casing fluid. They are very good for "Gumbo" shales. The mud weight can be controlled from 7–22 lbs/gal. It is sensitive to temperature but does not dehydrate as in the case of water based mud as mentioned before.
0.052 * Mud weight (in ppg) * TVD (in feet) During circulation, the pressure applied is due to drilling mud weight and also due to the pressure applied by the mud pumps to circulate the drilling fluid. Pressure under circulating condition = Pressure under static condition + Pressure due to pumping at that point or pressure loss in the system
See mud log for an example of the corrected d-exponent plotted on a mud log. The parameter is an extension ("correction", hence the "c" notation) to the d-exponent method previously used for estimating formation pore pressures. The extension consists of a correction for the mud weight in use, compared to "standard" mud for the region.
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A mud balance, also known as a mud scale is a device used to measure the density (weight) of drilling fluid, [1] cement [2] or any type of liquid or slurry.