Basic Drilling Formulas for Equivalent Circulating Density -------------------------------------------------------------------------------- Crude Oil Rig Count Back to Formula Page Equivalent Circulating Density (ECD), ppg How to use basic formula to calculate Equivalent Circulating Density during drilling process. ECD,ppg = (annular presure loss, psi) / 0.052 / TVD ft + (mud weight in use, ppg) Example: annular pressure loss = 200psi true vertical depth = 10,000ft mud weight = 9.6ppg ECD, ppg = 200psi / 0.052 / 10,000ft + 9.6ppg ECD = 1o.oppg Metric calculation Equivalent drilling fluid density, kg/l = annular pressure loss, bar + 0.0981 + TVD, m + mud wt, kg/l Maximum Allowable Mud Weight from Leak-off Test Data ppg = ( leak-off pressure, psi) / 0.052 / (casing shoe TVD, ft) + (mud weight, ppg) Example: leak-off test pressure = 1140psi casing shoe TVD = 4000ft mud weight = 10.0 ppg ppg = 1140psi + 0.052 + 4000ft + 10.0ppg ppg = 15.48 Evaluate the rig and surface Evaluate the rig and surface equipment to become familiar with the maximum and minimum parameter variables that are available. An understanding of the limitations of the equipment can help in developing a realistic and practical solution to a drilling problem. Solids Control Equipment
Posted on: Tue, 09 Jul 2013 04:17:32 +0000
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