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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).
1 mud (bushel) = 100 litres 1 kop (cup) = 1 litre (1 Australian cup = 250 ml) 1 maatje (small measure) = 100 millilitres 1 vingerhoed (thimble) = 10 millilitres. Weight. 1 pond (pound) = 1 kilogram (1 pound avoirdupois = 0.454 kg) (though in modern colloquial speech, 500 g is also known as a pond. 1 ons (ounce) = 100 grams (1 ounce avoirdupois ...
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.
fluid ounces Imperial fluid ounce (fl oz) ≡ 1 imp fl oz. ≈ 0.960 759 940 40 US fl oz ≈ 0.947 102 083 33 US fl oz (food) ≡ 28.413 0625 mL ≡ 0.028 413 0625 L. US fluid ounce (customary) (fl oz) ≈ 1.040 842 730 79 imp fl oz. ≡ 1 US fl oz ≡ 0.985 784 318 75 US fl oz (food) ≡ 29.573 529 5625 mL ≡ 0.029 573 529 5625 L. US fluid ounce
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.
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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.