Method and System for Measuring and Calculating a Modified Equivalent Circulating Density (ECDm) in Drilling Operations
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United States of America Patent
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Issued Date -
Jan 9, 2014
app pub date -
Jul 5, 2012
filing date -
Jul 5, 2012
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Abandoned
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Abstract
A method for collecting and analyzing downhole pressure data includes disposing a plurality of pressure sensors at axially spaced locations along a drill string disposed in a well. A first data set that includes a data point for each of the pressure sensors is collected. Each data point includes a pressure value and a depth value. A value of modified equivalent circulating density (ECDm) is calculated for at least one data point. ECDm includes a static pressure component and a dynamic pressure component. Calculating the ECDm includes computing the static pressure component based on the true vertical depth of the pressure sensor, and computing the dynamic pressure component based on a second depth value that differs from the true vertical depth and is common to all the pressure sensors for which ECDm is calculated.
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