DD Calaculations
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Transcript of DD Calaculations
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7/28/2019 DD Calaculations
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DIRECTIONAL DRILLING FORMULAE
Extrapolate to Bit Inclination at Bit
X = Angle at Bit X = Build Rate x Distance to bit
X = (Meters set) (DL per m) (Cos TF set) +Present Inc 10/100/30 + Last Inc
Degrees of Turn TVD at Bit
X = (Meters Set) (DL per m) (Sin TF set) X = Sin fo Bit Inc-previous inc x 1719Sin of present Inc Build Rate x present TVD
Change in TVD Build Rate Required = X
Change in TVD = (Cos average INC) CL X = Sin Target Inc Sin Bit Inc x 1719
TVD remaining to Target
Angle required for a given TVD change over a given CL X = Build Rate
Angle needed = Acos + Change inTVD X = Present inc Previous incCL Length Slid x 10/100/30m
Open Hole Sidetrack to achieve separation, slide x meters Motor is giving X degrees / 30 m
X = Hole Size x 2 X = Dogleg Seen (CL)
Sin (Motor DL/m) Meters Set
Turn Rate required to hit Target Given TVD will result in What MD ?
Azm @ Tgt Azm @ Bit (Projection) X 10 / 30 TVD @ Tgt Present IncMD @ Tgt MD @ Bit (Present Inc + Angle @Bit divide by 2) Cos
What will be the resulting VS if BR changes Closure Azimuth
Tgt Inc Present Inc X 30 = CL Departure x Arc tan
BR/30 Latitude
CL + Present MD = VS +/- Quadrant of your Section Direction
Distance from Proposal
(Proposal Lat Actual Lat)2 + (Proposal Dep Actual Dep)2 + (Proposal TVD-Actual TVD)2
This is for 3D..for 2D ignore the TVD part of the equation
- 360
+ 180 - 180
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