![]() OD = 6.5 in ID = 2.5 in L = 600 ft Pressure Drop In Drill Collars NOTE: NRe > 2,100, so Friction Factor in DC (fdc): So, OD = 6.5 in ID = 2.5 in L = 600 ft Pressure Drop In Drill Collars Effective Viscosity in Collars(mec): Reynolds Number in Collars (NRec): OD = 6.5 in ID = 2.5 in L = 600 ft Power-Law Constant (n): Fluid Consistency Index (K): Average Bulk Velocity inside Drill Collars (Vdc): OD = 4.5 in ID = in L = 11,400 ft Friction Pressure Gradient (dP/dL)p : Friction Pressure Drop in Drill Pipe : DPdp = 665 psi OD = 4.5 in ID = in L = 11,400 ft NOTE: NRe > 2,100, so Friction Factor in Pipe (fp): So, OD = 4.5 in ID = in L = 11,400 ft Effective Viscosity in Pipe (mep): Reynolds Number in Pipe (NRep): OD = 4.5 in ID = in L = 11,400 ft Power-Law Constant (n): Fluid Consistency Index (K): Average Bulk Velocity in Pipe (Vp): PPUMP Q = gal/min r = lb/gal PPUMP = DPDP + DPDC + DPBIT NOZZLES + DPDC/ANN + DPDP/ANN + DPHYD The relevant rotational viscometer readings are as follows: R3 = (at 3 RPM) R100 = 20 (at 100 RPM) R300 = 39 (at 300 RPM) R600 = 65 (at 600 RPM) The 300 and 600 RPM reading are used for pressure drop calculations inside drillpipe, where shear rates are, generally, quite high.ĮxampleĜalculate the pump pressure in the wellbore shown on the next page, using the API method. The 3 and 100 RPM reading are used for pressure drop calculations in the annulus, where shear rates are, generally, not very high. VISCOMETER RPM 3 100 300 600 ANNULUS BOB DRILL STRING SLEEVE API RP 13Dĩ API RP 13D, June 1995 for Oil-Well Drilling FluidsĪPI RP 13D recommends using only FOUR of the six usual viscometer readings: Use 3, 100, 300, 600 RPM Readings. ![]() Laminar Flow Turbulent LOG (SHEAR STRESS) (psi) n 1 9, 2002ģ Contents The Power Law Model The Rotational ViscometerĪ detailed Example - Pump Pressure Pressure Drop in the Drillpipe Pressure Drop in the Bit Nozzles Pressure Drop in the Annulus Wellbore Pressure ProfilesĤ Power Law Model K = consistency index n = flow behaviour index 1 PETE 411 Well Drilling Lesson 13 Pressure Drop CalculationsĪPI Recommended Practice 13D Third Edition, June 1, 1995Ģ Homework HW #7.
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