18.11.2014 Views

STANDARD HANDBOOK OF PETROLEUM & NATURAL GAS ...

STANDARD HANDBOOK OF PETROLEUM & NATURAL GAS ...

STANDARD HANDBOOK OF PETROLEUM & NATURAL GAS ...

SHOW MORE
SHOW LESS

Create successful ePaper yourself

Turn your PDF publications into a flip-book with our unique Google optimized e-Paper software.

Downhole Motors 869<br />

Stator<br />

t<br />

Figure 4-193. Turbine rotor and stator geometry of a single stage. (Courtesy<br />

Smith International, Inc.)<br />

The pressure drop Ap (psi) through a given turbine motor design is usually<br />

obtained empirically. Once this value is known for a circulation flowrate and<br />

mud weight, the pressure drop for other circulation flowrates and mud weights<br />

can be estimated.<br />

If the above performance parameters for a turbine motor design are known<br />

for a given circulation flowrate and mud weight (denoted as l), the performance<br />

parameters for the new circulation flowrate and mud weight (denoted as 2) can<br />

be found by the following relationships:<br />

Torque<br />

M, = ( ;rM1<br />

(4-145)<br />

M, = [$]MI<br />

(4-146)<br />

Speed<br />

(9% N, = (4-147)

Hooray! Your file is uploaded and ready to be published.

Saved successfully!

Ooh no, something went wrong!