Page 110 - Formulas and Calculations for Petroleum Engineering

Drilling engineering formulas and calculations Chapter 2 103

Wdp: Drill Pipe Weight Per Feet (lb/ft)
L: Drill Collar Length (ft)
BF: Buoyancy Factor (dimensionless)

Output(s)
W c : Buoyed Weight of Drill Collars-buoyed Weight of Drill Pipe (lb)
RT TM : Round Trip Ton Miles (ton miles)

Formula(s)

ð
W ¼ L BF Wdc WdpÞ
c

ð
W D L +D +2 DÞ 2 W +W Þ
ð
p
b
p
c
RT ¼
TM
5280 2000
Reference: Lapeyrouse, N. J., 2002, Formulas and Calculations for Drilling, Production and Workover, Second Edition,
Gulf Professional Publishing, Page: 44.
2.66 Drilling ton miles—While making short trip ton miles
Input(s)
T 6 : Ton Miles for One Round Trip-at the Deeper Depth, the Depth of the Bit Before Starting Short Trip (ton miles)
T 5 : Ton-miles for One Round Trip-at Shallower Depth,the Depth that the Bit is Pulled up to (ton miles)

Output(s)

T ST : Short Trip Ton Miles (ton miles)

Formula(s)

T ST ¼ T T Þ
ð
5
6
Reference: Lapeyrouse, N. J., 2002, Formulas and Calculations for Drilling, Production and Workover, Second Edition,
Gulf Professional Publishing, Page: 47.

2.67 Drilling ton miles—Setting casing ton miles

Input(s)
W p : Buoyed Weight of Casing (lb/ft)
L cs : Length of One Joint of Casing (ft)
D: Depth of the Setting (ft)
W b : Weight of Travelling Block Assembly (lb)

Output(s)

T c : Setting Casing Ton Miles (ton miles)