5/28/2018 Formula Well Control
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FORMULA WELL CONTROL
no Name Formula convert Formula
1 Hydrostatic pressure ( Ph ) Psi Ph = 0,052 x ! x "#$
2 Pressure %radient ( &m) Psi ' t &m = 0,052 x !
"o convert pressure %radient to mud *ei%ht Pp%* =
052,0
Gm
+ "o convert pressure to mud *ei%ht Pp%! =
TVDxPh
052,0
5 Hydrostatic pressure usin% pressure %radient- Psi Ph = &m
x "#$
. /uivalent circulatin% density $ Pp%$ = *
TVDx
APL
052,0
3 aximum allo*a4le mud *ei%ht rom leao test ( 6! )
Pp%6! = !tot
TVDx
Plot
052-0
7 aximum allo*a4le annular suracepressure ( 668P )
Psi 668P =( 6!9! ) x ( "#$shoe) x ( 0-052 )
: ;oyle2
11 Pressure chan%e or a chan%e o mud *ei%ht Psi
Pne*= Pold
old
new
MW
MW>
12 ?ill *i%ht mud ( ! ill ) Pp%! ill= !
052-0xTVD
SIDPP
1 8hut in casin% pressure (8@P) Psi 8@P = ( &m9&i ) x Hi
8@$PP
1+ @nitial circulatin% pressure ( @P ) Pp% @P = Pscr 8@$PP
15 Final circulatin% Pressurre (FP) Pp%FP = Pscrx
MW
MWkill
1. ;arite re/uired to increase mud *ei%ht
( 4arite )
l4s'44l
;arite =)!95-7(
)!9!(1500
2
12
13 Hei%ht o inlux ( Hi ) Ft
H1=
annular
Pit
capacity
Gain
17 "rip mar%in ' saety actor ( " ) Pp% " =052-0
ar%xTVD
inemSafety !
1: stimated inlux %radient (&inlux) Psi ' t&inlux= ! x (
0,052 ) A
Hi
SIDPPSIP>
20 "riplex pump output at 100 B eiciency( output )
44l'stroe Cutput = ( 0,0002+ ) x ( $2) x 8troe
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21 Percolation Date ( PD ) Ft 'hrPD =
052-0xMW
P
22 Pipe capacity 44l' tapacitypipe=
+-102:
2ID
2 6nnular capacity 44l'tapacityannular=
+-102:
)()( 22 DpDh
2+ 6nnular velocity ( t'min )#elocityannular = 22
+-102:
DpDh
!utputx pump
=
annularapacity
pump!utput
25 Formation Pressure ( P ) Psi P = 8@$PP ( ! x 0-052 x "#$
)
2. &as mi%ation rate ( Dm ) Ft'hr Dm =
mG
SIP=
mG
pre""ureinincrea"e
23 Hei%ht o slu% ( Hslu%)
Hslu% = pipe
"lu#
apacity
Volume
=
)( MWMW
MWxhei#ht
"lu#
drillpipe
27 Hei%ht o dry pipe
Hdrillpipe =
"lu#H
MWMWxH "lu# )(
2: 8lu% *ei%ht
!slu%="lu#
drillpipe
H
MWxH
0 ;ottom hole pressure, static casein drillstrin% ( ;HP )
Psi ;HP = 8@$PP Ph( ud in drillstrin% )
