دیکشنری تخصصی مهندسی نفت - نسخه آنلاین

n: a measure of the amount of pressure in pounds per square inch that a column of fluid (such as drilling mud) exerts on the bottom of the column for every foot of its length. For ex- ample, 10 pounds per gallon mud exerts 0.52 pounds per square inch per foot (11.8 kilopascals per metre),so a column of 10 pounds per gallon (1,198.2 kilograms per cubic metre) mud that is 1,000 feet (304.8 metres) long exerts 520 pounds per square inch (3.6 megapascals) at the bottom of the column. See pressure gradient.