Turbine motor stall torque

When sufficient weight has been placed on the turbine motor and bit, the motor will cease to rotate and the motor is described as being stalled. At this condition, the turbine motor produces its maximum possible torque. Even when the motor is stalled, the drilling mud is still circulating and the pressure drop is approximately 1,324 psi. 

The stall torque M, (ft-lb) for any turbine motor can be determined from [86]. -5 T1hT1n,n.7 ,q tanP... 

Using the basic performance data given in Table 4-110 for the 6-f--in. outside diameter turbine motor with 212 stages, determine the stall torque, maximum horsepower and pressure drop for this motor if only one motor section with 106 stages were to be used for a deviation control operation. Assume the same circulation flow rate of 400 gal/min, but a mud weight of 14 Ib/gal is to be used. 

Stall Torque. From Table 4-110 the stall torque for the turbine motor with 212 stages will be twice the torque value at optimum speed. Thus the stall torque for 10 Ib/gal mud weight flow is... 

From Equation 4-138 it is seen that stall torque is proportional to the number of stages used. Thus the stall torque for a turbine motor with 106 stages will be (for the circulation flowrate of 400 gal/min and mud weight of 10 Ib/gal)... 

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See also in sourсe #XX -- [ ]

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