Example Mud Weight On Bit Horsepower

A pump is capable of a pressure of 2000 psig at a circulation rate of 400 gpm. Friction loss is 1000 psi and the mud weight is 12 ppg. Calculate the available bit hydraulic horsepower if the mud weight is increased to 15 ppg and the circulation rate remains at 400 gpm.

Current Bit HHP

1000 * 400

1714

A5N.8

New pressure for bit = 2000 -1195 = 805 psid If the jets on the bit are enlarged, then 805 * 400

1714

= 188 hp and 45 hp are lost to the additional friction of the heavier mud.

(Common fluid mechanics equations) vis-22W-78QL78L

Therefore: Pf =

9359 d478

400 gpm

12 ppg

GLOBE VALVE, OPEN

GLOBE VALVE, OPEN

STANDARD ELBOW OR RUN OF TEE REDUCED ยป/;

MEDIUM SWEEP ELBOW OR RUN OF TEE REDUCED %

Oil Well Weight Bit

NOTE:

+1 0

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