Rig pump output, normally in volume per stroke, of mud pumps on the rig is one of important figures that we really need to know because we will use pump out put figures to calculate many parameters such as bottom up strokes, wash out depth, tracking drilling fluid, etc. In this post, you will learn how to calculate pump output for both triplex pump and duplex pump in both Oilfield and Metric Unit.
Triplex Mud Pump
Triplex Pump Output Formula
Oilfield Unit
Triplex Pump Output = 0.000243 × (Liner Diameter ) 2 × (Stroke Length)
Where,
Triplex pump output in bbl/stk
Liner Diameter in inch
Stroke Length in inch
Example:
Determine the pump output in bbl/stk at 100% and 97% efficiency
Liner size = 6 inch
Stroke length = 12 inch
Triplex pump output @ 100% efficiency
Triplex pump output @ 100% = 0.000243 × 62 × 12
Triplex pump output @ 100% = 0.104976 bbl/stk
Triplex pump output @ 97% efficiency
Adjust the triplex pump output for 97% efficiency:
Triplex pump output @ 97% = 0.104976 × 0.97 bbl/stk
Triplex pump output @ 97% = 0.101827 bbl/stk
Metric Unit
Triplex Pump Output = 2.3576 × 10-9× (Liner Diameter ) 2 × (Stroke Length)
Where,
Triplex pump output in m3/stk
Liner Diameter in mm
Stroke Length in mm
Example:
Determine the pump output in bbl/stk at 100% and 97% efficiency
Liner size = 152.4 mm
Stroke length = 304.8 mm
Triplex pump output @ 100 % efficiency
Triplex pump output @ 100% = 2.3576 × 10-9 × 152.42 × 304.8
Triplex pump output @ 100% = 0.016690 m3/stk
Triplex pump output @ 97% efficiency
Adjust the triplex pump output for 97% efficiency:
Triplex pump output @ 97% = 0.016690 × 0.97 m3/stk
Triplex pump output @ 97% = 0.016189 m3/stk
Duplex Mud Pump (Ref: http://www.sunmachinery.com/8214R_01.jpg)
Duplex Pump Output Formula
Oilfield Unit
Duplex Pump Output = 0.000162 × S × [2(D)2 – d2]
Where:
Duplex pump output in bbl/stk
D = liner diameter in inch
S = stroke length in inch
d = rod diameter in inch
Example:
Determine the duplex pump output in bbl/stk at 100% and 85% efficiency
Liner diameter = 6 inch
Stroke length = 12 inch
Rod diameter = 2.0 in.
Duplex pump output @ 100 % efficiency
Duplex pump output @ 100% = 0.000162 × 12 × [2 (6) 2 -22 ]
Duplex pump output @ 100% = 0.13219 bbl/stk
Duplex pump output @ 85% efficiency
Adjust pump output for 85% efficiency:
Duplex pump output @ 85% = 0.132192 × 0.85 bbl/stk
Duplex pump output @ 85% = 0.11236 bbl/stk
Metric Unit
Duplex Pump Output =1.57172 × 10-9 × S × [2(D)2 – d2]
Where:
Duplex pump output in m3/stk
D = liner diameter in mm
S = stroke length in mm
d = rod diameter in mm
Example: Determine the duplex pump output in m3/stk at 100% and 85% efficiency
Liner diameter = 152.4 mm
Stroke length = 304.8 mm
Rod diameter = 50.8 mm
Duplex pump output @ 100 % efficiency
Duplex pump output@ 100% = 1.57172 × 10-9 × 304.8 × [2 (152.4) 2 -50.82 ]
Duplex pump output@ 100% = 0.02102 m3/stk
Duplex pump output @ 85% efficiency
Duplex pump output@ 85% = 0.02102 × 0.85 m3/stk
Duplex pump output @ 85% = 0.01786 bbl/stk
Please find the Excel sheet to calculate triplex pump output and duplex pump output
Ref books:
Lapeyrouse, N.J., 2002. Formulas and calculations for drilling, production and workover, Boston: Gulf Professional publishing.
Bourgoyne, A.J.T., Chenevert , M.E. & Millheim, K.K., 1986. SPE Textbook Series, Volume 2: Applied Drilling Engineering, Society of Petroleum Engineers.
Mitchell, R.F., Miska, S. & Aadny, B.S., 2011. Fundamentals of drilling engineering, Richardson, TX: Society of Petroleum Engineers.
Where u given example for duplex there little fault for small (d) u given12″ insted for 2″
Ranjit,
Thanks for information. I correct it already.
How I can calculate the pump effeciency prior to cement job
You may need to pump a certain volume and compare the actual volume pump and the calculated value.
that’s we do it take 50 bbls from tank( measured level) and the return to trip tank with started zero pump strks and compared the results ( Volume pumped& pump Strks)
My question is where is the constant .000243 for a tri-plex and .000162 for a duplex derived from? Just more out of curiosity than anything else.
This is a conversion factor.
Please,how can I calculate the maximum pressure for each pump liner sizes .
Thanks
The maximum pressure can be found in a mud pump specification. It should tell you how much pressure and flow rate that you can pump for each liner size.
Regards,
Shyne.
Without changing liners of a triplex mud pump can I get raise in discharge pressure by reducing SPM below it’s maximum rating?
You need to check with the pump specification. If you need more pressure, you may need to change to a smaller liner.
what are common efficiency factors we shall use for triplex and duplex pumps in case we use / not use charging pumps?
We typically use 97% for these pumps.