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STANDARD HANDBOOK OF PETROLEUM & NATURAL GAS ...

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644 Drilling and Well Completions<br />

(text continued from page 631)<br />

The required pump working pressure PWP (psi) can be calculated as<br />

PWP = APs + APd + APa + AP,, (4-35)<br />

where APs = pressure loss through surface equipment in psi<br />

APd = pressure loss through the inside of the drill string in psi

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