Known Factors

WOB- Desired Weight on Bit (buoyed) = 40,000 lb

JTDW - Jar Tension Drilling Weight (buoyed)= 15,000 lb

WDJ - Weight on Drilling Jar (buoyed) = 10,000 lb

DC - Drill collar in air - 6¼ x 2¼ (90.6 lb/ft) = 2,718 lb (each)

BF - Buoyancy factor (13 lb/gal) (Table 2) = 1.25

DJ - Drilling Jar Weight (in air) = 1,600 lb

Activity 1 Jar positioning above the transition zone

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Known Factors

WOB- Desired Weight on Bit (buoyed) =

JTDW - Jar Tension Drilling Weight (buoyed) =

WDJ - Weight on Drilling Jar (buoyed) =

DC - Drill collar in air - 6¼ x 2¼ (90.6 lb/ft) =

BF - Buoyancy factor (13 lb/gal) (Table 2) =

DJ - Drilling Jar Weight (in air) =

Drilling Assembly Above Drilling Jar

EQUATION (IN AIR) EXAMPLE

LB = WDJ x BF x =

FT = WDJ x BF WT of DC in LB/FT

x . =

DC = WDJ x BF WT per 30 FT of DC

x . =

Lower Drilling Assembly (LDA)

LB = [JTDW + WOB] (BF) [ + ] ( ) =

FT = [JTDW + WOB] (BF) WT of DC in LB/FT [ + ] ( ) =

DC = [JTDW + WOB] (BF) WT per 30 FT of DC [ + ] ( ) =

BIT Weight Drill Collar (BWDC)

BWDC = DESIRED WOB (BF) x =

Activity 1 Jar positioning above the transition zone

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