ABCDEFGHIJKLMNOPQRSTUVWYZAAABACADAEAFAGAHAIAJAKALAMANAOAPAQ
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Mud Motors, Jets & Surveys
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Positive Displacement Motors:
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Physical Characteristics:
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1) Outside Diametre of the motor.
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2) Ratio of the Shaft lobes (Rotor) to the Sleeve lobes (Stator) which vary from 1:2 (fast speed) and 3:4
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or 4:5 or 5:6 (medium speed) to 7:8 or 8:9 or 9:10 (slow speed).
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The higher the number of shaft lobes the lower the rotary speed.
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The rotary speed varies only slightly with torque and pressure drop.
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3) Number of Stages (3, 4 or 6 - and everything between, 3.7, 4.8 etc. - spirals or coils as viewed from the top).
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4) Length and Weight (Usually, longer mud motors have more stages).
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Hydraulic Characteristics:
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1) Minimum and maximum flowrates.
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2) Minimum and maximum rotary speeds (directly proportional to the flow rate), N2 = N1(Q2÷Q1).
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3) Maximum pressure drop across the motor.
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4) Maximum torque supplied (directly proportional to the pressure drop across the motor), T2 = T1(Δp2÷Δp1).
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5) Maximum mechanical horsepower output supplied (the product of rpm, times the torque), Pm = (TN÷955).
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the hydraulic horsepower (the product of pressure drop times the flow rate), Ph = (DpQ÷60000).
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6) Maximum efficiency. Efficiency (h) is the ratio of (Output÷Input), h = (Pm÷Ph) or h = 62.8(TN÷DpQ).
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Example:
Where:
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 Black Max 63/4", 7:8 lobes, 3 Stage mud motor
T = torque in daN.m
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InputkW Output Hp
N = rotary speed in RPM
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Qmax, L/min:
2270
Ph, in kW & Hp:
125167
Dp = pressure drop in the motor in kPa
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Nmax, rpm:
172
Pm, in kW & Hp:
92123
Q = mud flow rate in L/min (1000Litres = 1.0m3)
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Tmax, daN.m:
512
Efficiency, h
74%
Ph = hydraulic horsepower in kW
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Pmax, kPa:
3300
Pmax = maximum differential pressure
Pm = mechanical horsepower output in kW
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Quick TFA & Jet Selection for < the Max Stand Pipe PressureJet Size, No & Flow Area 17
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INPUT
OUTPUT
Jet Sz 32s
No usedTFA , in1or cm17
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Bit or Mud M. will be pulled out at Measured Depth of, m
29501,677514415in2 TFA or2431,3253768,550795802183,8783601
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Desired Max Stand Pipe Press (with Differential), kPa
2500010,822652cm2 TFA2210,3712282,395014565
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Mud Motor Pressure Differential Expected, kPa
30001582
Hp Pump(s)
00750
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Maximum Mud Flow Rate Expected, m3/min
2,840010,02
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Maximum Mud Weight Expected, kg/m3
120000
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Number of Jets to be used (max 12):
400
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All Jets are given in sizes of 32s Totals:41,69660410,94581037
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Jet 1Jet 2Jet 3Jet 4
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23242324
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232423,26123,5
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ACTUAL vs PLANNED TARGET
 N+
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Input in (m or ft)
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N+/S-E+/W-II I
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S-987,79185,24E+
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S-971,45191,16E W-E+
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Output+
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N16,345,92EIIIIV
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Distance from Target:
17,38m or ft
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@ an Azimuth of:
19,92degrees S-
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INPUT
OUTPUT
Related ConversionsINPUT
OUTPUT
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3,28
ft to cm
100,0INPUT
OUTPUT
INPUT
OUTPUT
100,0
cm to ft
3,28
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3000,0
m to ft
9842,51,85
m3 to BBLs
11,641,00
m3 to gals
264,2500,0
daN.m to Lb.ft
3688
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13400,0
ft to m
4084,310,00
BBLs to m3
1,59300,0
gals to m3
1,143500,0
Lb.ft to daN.m
475
60
18500
kPa to psi
2683,21,00
m3 to ft3
35,311850,0
kg/m3 to ppg
15,43919,1
mm to 32s
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2850,0
psi to kPa
1965050,00
ft3 to m3
1,4219,000
ppg to kg/m3
2276,720
32s to mm
15,9
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