BAKER HUGHES - Drilling Fluids Reference Manual

HYDRAULICS
Cuttings Concentration
We have timed a stand of pipe 93 ft long drilled down in 14 minutes with a top drive.
1. Calculate the ROP.
Operator wants to make some hole!
2. Calculate the cuttings concentration in the annulus after drilling down this stand.
C ( ROP)D 2
a
= ------------------------
14.71(
E
t ) × 100 =
Q
(--------------------------------- 398.6) ( 9.875 ) 2
× 100 = 7.7%
14.71( 91) ( 375)
3. Calculate the effective fluid weight due to this enormous cuttings concentration. Assume SG c =
2.2.
ρ
=
⎛ C C ⎞ ⎛ 7.7 ⎞ ⎛ 7. 7 ⎞
⎜ ⎟ + ⎜ − ⎟
⎝ 100 ⎠ ⎝ 100 ⎠ ⎝ 100 ⎠ ⎝ 100 ⎠
a ⎞ ⎛ a
( SG )( 8.34) ⎜ ⎟ +ρ ⎜1
− ⎟ = ( 2.2)( 8.34) 15.3 1 15.53lb / gal
e c
=
What do you need to recommend to the Drilling Foreman?
m
BAKER HUGHES DRILLING FLUIDS
REFERENCE MANUAL
REVISION 2006 9-37