Pump Output (PO) Oil and Gas drilling process - Pupm output for Triplex and Duplex pumps Triplex Pump Formula 1 PO, bbl/stk = 0.000243 x ( in)
E.xample: Determine the pump output, bbl/stk, at 100% efficiency for a 7" by 12". triplex pump: PO @ 100%,= 0.000243 x 7² x12 PO @ 100% = 0.142884bbl/stk Adjust the pump output for 95% efficiency: Decimal Decimal equivalent = 95 + 100 = 0.95 PO @ 95% = 0.142884bbl/stk x 0.95 PO @ 95% = 0.13574bbl/stk Formula 2 PO, gpm = [3(D² x 0.7854)S]0.00411 x SPM
where D = liner diameter, in. S = stroke length, in. SPM = strokes per minute Determine the pump output, gpm, for a 7" by 12". triplex pump at 80 strokes per minute: PO, gpm = [3(7² x 0.7854) 1210.00411 x 80 PO, gpm = 1385.4456 x 0.00411 x 80 PO = 455.5 gpm
Example: Duplex Pump Formula 1 0.000324 x (liner diameter, in)² x ( stroke lengh, in) = ________ bbl/stk -0.000162 x (rod diameter, in)² x ( stroke lengh, in) = ________ bbl/stk
Pump out put @ 100% eff = ________bbl/stk Example: Determine the output, bbl/stk, of a 5 1/2" by 14" duplex pump at 100% efficiency. Rod diameter = 2.0":
0.000324 x 5.5² x 14 = 0.137214bbl/stk -0.000162 x 2.0² x 14 = 0.009072bbl/stk Pump output @ 100% eff. = 0.128142bbl/stk Adjust pump output for 85% efficiency: Decimal equivalent = 85 ÷ 100 = 0.85 PO@85%)= PO@85%)= 0.128142bbl/stk x 0.85 PO@ 85% = 0.10892bbl/stk Formula 2
PO. bbl/stk = 0.000162 x S[2(D)² - d²] where S = stroke length, in. D = liner diameter, in. d = rod diameter, in. Example: Determine the output, bbl/stk, of a 5 1/2". by 14". duplex pump @ 100% efficiency. Rod diameter = 2.0in.: PO@100%=0.000162 x 14 x [ 2 (5.5)² - 2² ] PO @ 100%)= 0.000162 x 14 x 56.5 PO@ 100%)= 0.128142bbl/stk Adjust pump output for 85% efficiency: PO@85%,= 0.128142bb/stkx 0.85
[email protected]%= 0.10892bbl/stk Metric calculation Pump output, liter/min = pump output. liter/stk x pump speed, spm. S.I. units calculation Pump output, m³/min = pump output, liter/stk x pump speed, spm. Mud Pumps
Mud pumps drive the mud around the drilling system. Depending on liner size availability they can be set up to provide high pressure and low flow rate, or low pressure and high flow rate. Analysis of the application and running the Drill Bits hydraulics program will indicate which liners to recommend. Finding the specification of the mud pumps allows flow rate to be calculated from pump stroke rate, SPM. Information requiredo Pump manufacturer o Number of pumps o Liner size and gallons per revolution Weight
• As a drill bit cutting structure wears more weight will be required to achieve the same RoP in a homogenous formation. • PDC wear flats, worn inserts and worn milled tooth teeth will make the bit drill less efficiently. • Increase weight in increments of 2,000lbs approx. • In general, weight should be applied before excessive rotary speed so that the cutting structure maintains a significant depth of cut to stabilise the bit and prevent whirl. • If downhole weight measurements are available they can be used in combination with surface measurements to gain a more accurate representation of what is happening in the well bore.
