206191825.xls.
ms_office
MITCHELL ENGINEERING PROGRAMS
COPYRIGHT 1990 MITCHELL ENGINEERING, PO BOX 1492. GOLDEN, CO, 80402, USA (303) 273 3744
Bottom Hole Assembly Design and Usage
GRADE YIELD 60,000 75,000 105,000 80,000 135,000 95,000
Jar Triggering Load
6,000 5 4.276 S 21 20 90 7.75 3 12 15 1,000
ft in in API ppf % ft in in ppg in^2 psi Length of Pipe Pipe OD Pipe ID Grade of Pipe (D,E,G,N,S,X) W eight of Pipe % W ear of Pipe Length of Collars Collar OD Collar ID Mud W eight Seal Area of Jar Assistance Pressure for Jars
D E G N S X
135,000 136.3 448,604 112,919 335,685 15,000 448,604 433,604
psi ppf lbs lbs lbs lbs lbs lbs
API Unit Yield Strength of the Pipe W eight of Drill Collars W orking Tensile Strength Bouyed W eight of the String Above the Jars Maximum Triggering Load Pump Extending Force Maximum Load W ITHOUT Hydraulic Assistance Maximum Load W ITH Hydraulic Assistance
Mechanical Properties of the B.H.A.
Air Weight and Bouyed Weight of the B.H.A.
8 3 N 26.5 16 16
in in
Collar OD or Side Length,S Collar ID Is(Are) the Collar(s) Square ?
ft ppg ppg
Length of Collars Mud W eight - Outside Mud W eight - Inside
146.9 3,891.5 110.9 2,940.1
ppf lbs ppf lbs
W eight per Foot of Drill Collars W eight of Drill Collars Bouyed W eight per Foot of Drill Collars Bouyed W eight of Drill Collars
Stiffness Calculations
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206191825.xls.ms_office
MITCHELL ENGINEERING PROGRAMS
3.00E+07
psi
Modulus of Elasticity
197.1 394.2 0.275589877 0.635577836
in^4 in^4 in
Resistance to Axial Bending Resistance to Torsion Sag (Resistance to Sag) Droop (Resistance to Droop)
Tapered B.H.A. 6 4.276 8 3
15.74 49.27 3.13 in in in in in in Pipe OD Pipe ID Collar OD Collar ID Section Modulus of Pipe Section Modulus of Collars Section Modulus Ratio of Collars to Pipe SHOULD CONNECTION BE MADE ??
YES
Wall Forces
Wall Force in Doglegs
5 4.276 21 30 8 3 500 14,000 11 1.85 2,000 2,500 50,000
in in ppf ft in in ft ft ppg /100' ft ft lbs
Pipe OD Pipe ID W eight of Pipe Length of a Joint of Pipe Collar OD Collar ID Length of Collars Drilling Depth Mud W eight Dogleg Severity Depth of Dogleg Depth of Interest W eight on Bit
146.9 203,261
TENSION
ppf lbs
W eight of Collars Tension in the Drillpipe
1968.9 YES
lbs
W all Force
IS W EAR ACCEPTABLE ??
Wall Force in Inclined Holes
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206191825.xls.ms_office
MITCHELL ENGINEERING PROGRAMS
50 17 8.4
ppg ppg
Slant Angle Mud W ieght - Outside Mud W eight - Inside
9.9 7.6 228.1
ppf ppf lbs
Bouyed W eight of Pipe W all Force per Foot W all Force per Joint of Pipe
Centrifugal Force
91 17.5
R.P.M. Rotary Speed in Hole Diameter
163.9
ppf
W all Force per Foot
Torsional Damping - The Fly Wheel Effect
Collars Currently In The Hole
8 3 N 400 40
in in
Collar OD or Side Length,S Collar ID Are the Collars Square ?
ft
Length of Collars
394.2 79.8
in^4
Resistance to Torsion (Polar Moment of Inertia) Dampening Variable [DV]
R.P.M. Current Rotary Speed
Collars To Be Added To The Hole
11 3 N 180 3
in in
Collar OD or Side Length,S Collar ID Are the Collars Square ?
ft
Length of Collars
1,429.4 9.8
in^4
Resistance to Torsion (Polar Moment of Inertia) Dampening Variable [DV] Total Dampening
R.P.M. New Rotary Speed
89.5
Torque Of A Spinning B.H.A. 9.5 2.75 N 300 360
794.0 227,250 0.0573
in in Collar OD or Side Length,S [Of Collars In Hole] Collar ID [Of Collars In Hole]
Are the Collars Square ? ft Length of Collars
R.P.M. Current Rotary Speed in^4 lbs-ft sec Resistance to Torsion (Polar Moment of Inertia) Torque Transmitted To The Bit Acting Time Period
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206191825.xls.ms_office
MITCHELL ENGINEERING PROGRAMS
Torsional Bucking Of A B.H.A. And Drillpipe 5 4.276 10,000 21 8 3 N 400 100 0 -40,000
14.3 28.5 146.9 58,740.0 197.1 394.2 1,867.8
UNDEFINED
in in ft ppf in in Pipe OD Pipe ID Length of Pipe W eight of Pipe Collar OD or Side Length,S Collar ID Are the Collars Square ? ft Length of Collars
R.P.M. Current Rotary Speed lbs lbs in^4 in^4 ppf lbs in^4 in^4 lbs-ft lbs-ft lbs lbs lbs-ft Axial Load On Pipe (- = Compression)
Axial Load On Collars (- = Compression) Resistance to Axial Bending (Pipe) Resistance to Torsion W eight of Drill Collars Resistance to Axial Bending (Collars) Resistance to Torsion (Collars) (Pipe) W eight per Foot of Drill Collars
Buckling Torque of the Pipe Buckling Torque of the Collars Value of Axial Load on Pipe for Zero B.T. Value of Axial Load on Collars for Zero B.T. Torque Placed On Drillpipe By Collars
-0.293397869 -2,532.8 4,231.2
Buckling By Rotational Drag
^^^^^Uses Pipe And Collar Data From Example Above ^^^^^
440 150 92 95 80
Volts Amps % %
Voltage Across Motor Amperes Consumed Electrical Efficiency Mechanical Efficiency of Rotary System
R.P.M. Drill Pipe Rotational Speed
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206191825.xls.ms_office
MITCHELL ENGINEERING PROGRAMS
75
5,076.2 3,807.1 1,867.8
% lbs-ft lbs-ft lbs-ft
% of Rotational Drag Created by B.H.A. Drillpipe Torque by Rotary System Torque Created By B.H.A. Buckling Torque of the Pipe [Based On Axial Load]
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206191825.xls.ms_office
MITCHELL ENGINEERING PROGRAMS
Critical Buckling Loads 5 3 0 1
80.13 1.000 4,153.4
in in ppg st Pipe OD Pipe ID Mud W eight Order of Buckling (1,2) f (Order Coefficient for Buckling) Bouyancy Factor lbs Critical Buckling Load
Weight on Drill Bit In Vertical And Inclined Holes 36 5 4.276 21 9,000 8 3 N 90 3 3 11.3 11.3 30
in in in ppf ft in in Hole Diameter Pipe OD Pipe ID W eight of Pipe Length of Pipe Collar OD or Side Length,S Collar ID Is(Are) the Collar(s) Square ? ft Length of Collars
146.9 13,217 0.827 121.5 10,934 1,093 10,416 8,253 18,669
ppf lbs
W eight per Foot of Drill Collars W eight of Drill Collars Bouyancy Factor
ppf lbs lbs lbs lbs lbs
Bouyed W eight per Foot of Drill Collars Bouyed W eight of Drill Collars Bouyed W eight of Stabilizers Available W eight from Collars & Stabilizers Available W eight from the Drillpipe Total W eight Available
Number of Stabilizers (Same Size as Collars) ft ppg ppg Length of Each Stabilizer Mud W eight - Outside Mud W eight - Inside Hole Inclination
Critical Rotary Speeds Of B.H.A. 8 3 N
in in Collar OD or Side Length,S Collar ID Is(Are) the Collar(s) Square ?
146.9 73,425 2.31
ppf lbs Hz
W eight per Foot of Drill Collars W eight of Drill Collars Longitudinal Frequency
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206191825.xls.ms_office
MITCHELL ENGINEERING PROGRAMS
500 50 1 Y Y 40,000
ft
Length of Collars
R.P.M. Rotary Speed Order of Harmonic (1,3,5...) Is The Bit A Tri-Cone ? Is There A Shock Sub On The B.H.A. ? lbs/in Enter Spring Constant For Shock Sub
46.2 5.33 106.5 2.5
R.P.M. Critical Longitudinal Rotary Speed Hz Torsional Frequency
R.P.M. Critical Torsional Rotary Speed Hz Frequency Of Bit
Critical Rotary Speeds Of The Drillpipe 5 4.276 21 7,500 30 241.6 34.4
in in ppf ft ft Pipe OD Pipe ID W eight of Pipe Length of Pipe Langth Between Tool Joints
R.P.M. Critical Nodal Rotary Speed R.P.M. Critical Longitudinal Rotary Speed
Fatigue Of Drillpipe
GRADE D E YIELD 60,000 75,000 105,000 80,000 135,000 95,000
5 4.276 21 14,000 S 30 8 3 N 300 42 30000000
in in ppf ft API ft in in
Pipe OD Pipe ID W eight of Pipe Length of Pipe Grade of Pipe (D,E,G,N,S,X) Distance Between Joints Collar OD or Side Length,S Collar ID Is(Are) the Collar(s) Square ?
G N S X
135,000 5.275 146.9 0.827 333,723 276,097 52,345
psi in ppf
API Unit Yield Strength of the Pipe Cross Sectional Area Of Drillpipe W eight per Foot of Drill Collars Bouyancy Factor
ft ft psi
Length of Collars Length of Tools In Hole Modulus Of Elastisity
lbs lbs psi
W eight Of String Below Dogleg Bouyed W eight Of String Below Dogleg Bouyant Tensile Stress In The Drillpipe [Teff]
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206191825.xls.ms_office
MITCHELL ENGINEERING PROGRAMS
11.3 11.3 5 500 2,000
ppg ppg /100' ft lbs
Mud W eight - Outside Mud W eight - Inside Dogleg Severity Depth Of Dogleg Maximum Lateral Tooljoint Force
14.269 0.0254 12,780 2.56 1.38
in^4
Cross-Sectional Moment Of Inertia Of Drillpipe K
psi /100' /100'
Maximum Permissible Bending Stress [Grade E & S] Maximum Permissible Dogleg Severity [Fatigue] Maximum Permissible Dogleg Severity [W ear]
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