Page 162 - Formulas and Calculations for Petroleum Engineering

Drilling engineering formulas and calculations Chapter 2 155

2.194 Side force at bit in anisotropic formation

Input(s)
p: Buoyed Weight of Drill Collar (ppf)
E: Modulus of Elasticity (psi)
4
I: Moment of inertia of Drill Collar (in. )
r: Radial Clearance Between Hole and Collar (ft)
y: inclination Angle (degree)
W: Weight on Bit (lbf)

Output(s)
F: Side Force on Bit (lbf)

Formula(s)

! ! !
0:75 0:25
W 24 r 1:5 r
0:5
F ¼ p ð E * IÞ
24 E I p sin yðÞ E I p sin yðÞ
Reference: Samuel. E Robello. 501 Solved Problems and Calculations for Drilling Operations. Sigma Quadrant. 2015.
Houston, Texas, Page: 378.

2.195 Sinusoidal buckling
Input(s)

E: Modulus of Elasticity (psi)
4
I: Moment of Inertia (ft )
W: Weight on Bit (lbf)
y: Angle of Wellbore Inclination (degree)
r: Radial Clearence Between Wellbore and Component (ft)

Output(s)
F s : Buckling Force (lbf)

Formula(s)

!
0:5
E I W sin yðÞ
F ¼ 2
s
r
Reference: Samuel. E Robello. 501 Solved Problems and Calculations for Drilling Operations. Sigma Quadrant. 2015.
Houston, Texas, Page: 426.

2.196 Slurry density for cementing calculations
Input(s)

V s : Volume of Slurry (gal/stroke)
W a : Weight of Additive Per Sack (lb/stroke)
Q w : Total Water Requirement (gal/stroke)

Output(s)
s s : Slurry Density (lb/gal)