aerated annular pressures
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annular pressureTRANSCRIPT
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document.xls MITCHELL ENGINEERING PROGRAMS
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COPYRIGHT 1990 MITCHELL ENGINEERING, PO BOX 1492. GOLDEN, CO, 80402, USA (303) 273 3744
Aerated Annular PressuresWHILE CIRCULATING AERATED MUD
THE HUGHES TOOL CO. - H B WOODS EQUATION
REF: Bobo, Ormsby, Hoch; "Phillips Tests Air-Mud
Drilling",OIL AND GAS JOURNAL, Feb. 7, 1955, p. 108
SELECTED INPUT VARIABLESSymbols Values Descriptions of Input Variables
-------- -------- -----------------------------------------------------------
Qm 16.957 cu ft of mud circulated/minute; scf/m
Qa 678.261 cu ft of std. air circulated/minute; cf/m
rho air .07642 density of free atmospheric air; lb/cf
rho mud 65.824 density of mud; lb/cf
Dh 8.500 diameter of hole; in
Dp 4.500 OD of drillpipe; in
Po 14.7 pressure at the flow line entry; psia
Temp 60 temperature of atmospheric air; deg F
AV 60 desired annular velocity of mud; ft/m
Air/mud 40 air/mud injection ratio; scf/cf
COMPUTED INTERMEDIATE VARIABLESA .488 '= 0.00708*((C9/C8)*C10+C11)
B 600.300 '= 15*((C9/C8)+0.02)
C .00115 '= 0.00063*C8^2*((C9/C8)*C10+C11)
/((C12-C13)*(C12^2-C13^2)^2)
A+C .48883 '= C18+C20
C*B .69249 '= C20*C19
A*C .00056 '= C18*C20
radian 57.29578 '= 180/PI()
TABLE OF PRESSURE V. DEPTHPressure Depth Gradient 'Depth' at which pressure occurs; ft
15 5 1.15 /($B$21*$B$14^2+2*$B$22*$B$14+$B$22^2)))
100 1491 1.10 -(2*$B$19*SQRT($B$23)/$B$21^2)
200 2482 1.44 *($B$24*ATAN(($B$21*B34+$B$22)
800 5373 2.81 /($B$19*SQRT($B$23)))-$B$24
1,600 7853 3.89 *ATAN(($B$21*$B$14+$B$22)
1,800 8405 4.09 /($B$19*SQRT($B$23)))))
2,000 8943 4.27
2,500 10238 4.67
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document.xls MITCHELL ENGINEERING PROGRAMS
Page
Air Pressure Loss in Rig Piping
Press of Compressed Air 100 psig
Temp of Compressed Air 100 °F
Flow Rate 1500 c.f.m.
Pipe ID 3 in
Length of Pipe 100 ft
Flow Rate of Compressed Air 207.0 c.f.m.
Velocity of Compressed Air 70.3 f.p.s.
Density of Air @ P & T 0.5535 lbs/ft³
Friction Factor 0.0105
Pressure Drop of Compressed Air 1.24 psi/100ft
Compressor Horsepower OutputNumber of Stages 3Compressor Intake Pressure 14.7 psia
Compressor Discharge Pressure 350 psia
Compressor Intake Air Temperature 530 deg R
Metered Air Flow Rate 600 scf/m
Metered Air Temperature 540 deg R
Metered Air Pressure 348 psia
Compressor Horsepower 219 hp
intake
dischargemetercompressor
injection