Post on 07-Mar-2016
description
7/21/2019 Bhp & Well Kill Iadc
1/32
1-Constant BHP Theory
Sparks Petroleum Services OmanSparks Petroleum Services Oman
Constant Bottom Hole PressureConstant Bottom Hole Pressure
TheoryTheory
7/21/2019 Bhp & Well Kill Iadc
2/32
2-Constant BHP Theory
ObjectiveObjective
Describe why constant bottom holeDescribe why constant bottom hole
pressure BHP! is re"uire#pressure BHP! is re"uire#
Demonstrate the a##itive e$$ects o$Demonstrate the a##itive e$$ects o$pressurepressure
Describe how to account $or $rictionDescribe how to account $or $riction
State the proce#ures use# to keep BHPState the proce#ures use# to keep BHPconstant or nearly constant!constant or nearly constant!
7/21/2019 Bhp & Well Kill Iadc
3/32
%-Constant BHP Theory
Why do we want constant BHP?Why do we want constant BHP?
Prevent a##itional in$lu&Prevent a##itional in$lu&
Provi#e basis $orProvi#e basis $or#etermination o$#etermination o$
pressures at other pointspressures at other points
in the wellin the well
Can be monitore# via DPCan be monitore# via DP
S'DPP
S'CP
'n$lu& stops
when BHP
becomes
e"ual to the
(ormation
Pressure
BHP ) Pore Pressure
7/21/2019 Bhp & Well Kill Iadc
4/32
*-Constant BHP Theory
Consider a Simplified WellConsider a Simplified Well
(ormation Pressure +, psi
S'CP
+,
Out o$ hole. kick #etecte#Out o$ hole. kick #etecte#
/ell shut-in/ell shut-in
'n$lu& $low rate be0ins to'n$lu& $low rate be0ins to
#ecrease#ecrease
/ellbore BHP an# pore/ellbore BHP an# pore
pressure e"ualiepressure e"ualie
/hat is S'CP/hat is S'CP
7/21/2019 Bhp & Well Kill Iadc
5/32
+-Constant BHP Theory
mposed SCP stops influ!mposed SCP stops influ!
Total 3u#Hy#rostatic
Pressure is
+ psi
(ormation Pressure +, psi
S'CP
+,
S'CP
4
Total 3u# Hy#rostatic
Pressure o$ + psi
5"ualies the BHP
thus.
S'CP ) BHP - +
S'CP ) +, - +
S'CP ) , psi
) ,
7/21/2019 Bhp & Well Kill Iadc
6/32
6-Constant BHP Theory
Well Still Shut"inWell Still Shut"in
/hat happens as time passes/hat happens as time passesan# we #o nothin0 at allan# we #o nothin0 at all
7/21/2019 Bhp & Well Kill Iadc
7/32
7-Constant BHP Theory
#as $i%rates Half"way to Top#as $i%rates Half"way to Top
(ormation Pressure +, psi
,%
3u# Hy#rostatic
Pressure is 2+ psi
3u# Hy#rostatic
Pressure is 2+ psi
8as Pressure is +, psi
/O/9
BHP ) 8as Pressure 4
Hy#rostatic o$ 3u# Below
7/21/2019 Bhp & Well Kill Iadc
8/32
,-Constant BHP Theory
Casin% Pressure &lso ncreasesCasin% Pressure &lso ncreases
(ormation Pressure +, psi
%%
,%
3u# Hy#rostatic
Pressure is 2+ psi
3u# Hy#rostatic
Pressure is 2+ psi
8as Pressure is +, psi
/O/9
CP ) 8as Pressure less
Hy#rostatic o$ 3u# :bove
7/21/2019 Bhp & Well Kill Iadc
9/32
;-Constant BHP Theory
#as at the Suface#as at the Suface
(ormation Pressure +, psi
+,
1.,
3u# Hy#rostatic
Pressure is + psi
8as Pressure is +, psi
BHP ) 8as Pressure plusHy#rostatic o$ 3u# Below
(ormation likely to $aillon0 be$ore this
pressure is reache#9
7/21/2019 Bhp & Well Kill Iadc
10/32
1-Constant BHP Theory
'et(s Start Over'et(s Start Over
7/21/2019 Bhp & Well Kill Iadc
11/32
11-Constant BHP Theory
Can we )eep BHP constant?Can we )eep BHP constant?
Total 3u#Hy#rostatic
Pressure is
+ psi
(ormation Pressure +, psi
,
+,
=et>s start overs =aw
?eep the sum o$ 0as pressure?eep the sum o$ 0as pressure
plus the hy#rostatic o$ theplus the hy#rostatic o$ themu# below the 0as e"ual tomu# below the 0as e"ual to
the ori0inal BHP +, psi!the ori0inal BHP +, psi!
7/21/2019 Bhp & Well Kill Iadc
12/32
12-Constant BHP Theory
#as $i%rates Half"way to Top* BHP#as $i%rates Half"way to Top* BHP
Pressure +ept at ,-.. psiPressure +ept at ,-.. psi
(ormation Pressure +, psi
+,
@pper mu# column hy#rostatic is
2+ psi
=ower mu# column hy#rostatic is
2% psi
8as e&pan#s as 2 bbls mu# is ble#.
0as pressure #ecreases to %+ psi 2 bbls ble#
7/21/2019 Bhp & Well Kill Iadc
13/32
1%-Constant BHP Theory
Casin% Pressure ncreases as $ud isCasin% Pressure ncreases as $ud is
Bled and BHP +ept at ,-.. psiBled and BHP +ept at ,-.. psi
(ormation Pressure +, psi
1
+,
2 bbls ble#
CP ) 8as Pressure less
Hy#rostatic o$ 3u#
:bove
CP ) %+ - 2+
CP ) 1 psi
7/21/2019 Bhp & Well Kill Iadc
14/32
1*-Constant BHP Theory
#as at Surface as $ud is Bled and#as at Surface as $ud is Bled and
BHP +ept at ,-.. psiBHP +ept at ,-.. psi
(ormation Pressure +, psi
16
+,
6 bbls ble#
8as Pressure ) 16 psi
CP ) 16 psi3u# Hy#rostatic ) *2
BHP ) +, psi
7/21/2019 Bhp & Well Kill Iadc
15/32
1+-Constant BHP Theory
BHP has been )ept at ,-.. psiBHP has been )ept at ,-.. psi
(ormation Pressure +, psi
16
+,
6 bbls ble#
8as is at sur$ace
CP ) 16 psi
BHP ) +, psi
8reat
7/21/2019 Bhp & Well Kill Iadc
16/32
16-Constant BHP Theory
/se of the 0rill Pipe #a%e/se of the 0rill Pipe #a%e
(ormation Pressure +, psi
,
+,
Pit 8ain
BHP ) +, psiCP ) , psi
Pit 8ain ) + bbls
Hy#rostatic in DP ) + psi
S'DPP ) BHP - DP Hy#rostatic
S'DPP ) +, - +%
S'DPP ) + psiS'DPP ) + psi
S'DPP'$ we have #rill pipe in the'$ we have #rill pipe in the
hole. we can use it as ahole. we can use it as a
link to the bottom
7/21/2019 Bhp & Well Kill Iadc
17/32
17-Constant BHP Theory
#as $i%rated Half"way#as $i%rated Half"way
(ormation Pressure +, psi
1
+,
2 bbls
Ble#
BHP ) +, psi
Pit 8ain ) + bbls 4 2 bbls
S'DPP ) + psi
DP Hy#rostatic ) +% psi
BHP ) +4 +%BHP ) +4 +%
BHP ) +, psiBHP ) +, psi
+
Aow. as 0as mi0rates.Aow. as 0as mi0rates.
keep DP at + psi
7/21/2019 Bhp & Well Kill Iadc
18/32
1,-Constant BHP Theory
#as $i%rated to Surface#as $i%rated to Surface
(ormation Pressure +, psi
16
+,
6 bbls
Ble#
BHP ) +, psi
Pit 8ain ) + bbls 4 6 bbls
S'DPP ) + psi
DP Hy#rostatic ) +% psi
BHP )+ 4 +%BHP )+ 4 +%
BHP ) +, psiBHP ) +, psi
+
:s 0as mi0rates. keep:s 0as mi0rates. keep
DP at + psi< Blee#DP at + psi< Blee#
mu# as nee#e#
7/21/2019 Bhp & Well Kill Iadc
19/32
1;-Constant BHP Theory
12uivalent Hydraulic 0ia%ram12uivalent Hydraulic 0ia%ram
,
+,
Pit 8ain
+,
+,
Pit 8ain
+
=
7/21/2019 Bhp & Well Kill Iadc
20/32
2-Constant BHP Theory
Balanced WellBalanced Well
+%
Pit 8ain
The hy#rostatic pressure inThe hy#rostatic pressure in
both columns are e"ual
7/21/2019 Bhp & Well Kill Iadc
21/32
21-Constant BHP Theory
Circulatin% 3riction " 'ow 4ateCirculatin% 3riction " 'ow 4ate
+%+
Pit 8ain
6+
Pumpin0 at 2 spmPumpin0 at 2 spm
Circulatin0 (riction ) 6+ psiCirculatin0 (riction ) 6+ psi
:nnular (riction ) + psi:nnular (riction ) + psi
BHP ) +% psi 4 + psiBHP ) +% psi 4 + psi
Pump
+
Consi#er the pressures whileConsi#er the pressures whilepumpin0 at a slow ratepumpin0 at a slow rate
7/21/2019 Bhp & Well Kill Iadc
22/32
22-Constant BHP Theory
+ic) in the Hole " Well Shut"in+ic) in the Hole " Well Shut"in
,
+,
+ bbls
+
/ell shut- in/ell shut- in
Pit 8ain ) + bblsPit 8ain ) + bbls
Aot yet circulatin0Aot yet circulatin0
Shut-in pressures recor#e#Shut-in pressures recor#e#
Pump
7/21/2019 Bhp & Well Kill Iadc
23/32
2%-Constant BHP Theory
Pump is Brou%ht to SpeedPump is Brou%ht to Speed
,
+,+
+ bbls
11+
Circulatin0 at 2 spmCirculatin0 at 2 spm
'nitial Circulatin0 Pressure )'nitial Circulatin0 Pressure )
'nitial Shut-in Pressure 4'nitial Shut-in Pressure 4
'nitial (riction Pressure'nitial (riction Pressure
3aintain 11+ psi on DP3aintain 11+ psi on DP
Pump
(500 +605)
+
7/21/2019 Bhp & Well Kill Iadc
24/32
2*-Constant BHP Theory
+ic) is /p the Hole+ic) is /p the Hole
1
+,+
11+
Circulatin0 at 2 spmCirculatin0 at 2 spm
BHP constant because DPBHP constant because DP
pressure set at 11+ psipressure set at 11+ psi
3aintain 11+ psi on DP3aintain 11+ psi on DP
CP increases because lessCP increases because less
mu# hy#rostatic in annulusmu# hy#rostatic in annulus
Pump
6+
+
7/21/2019 Bhp & Well Kill Iadc
25/32
2+-Constant BHP Theory
+ic) is at the Surface+ic) is at the Surface
16
+,+
11+
Circulatin0 at 2 spmCirculatin0 at 2 spm
BHP constant because DPBHP constant because DP
pressure set at 11+ psipressure set at 11+ psi
3aintain 11+ psi on DP3aintain 11+ psi on DP
CP has reache# a ma&imumCP has reache# a ma&imum
Pump
6+
+
7/21/2019 Bhp & Well Kill Iadc
26/32
26-Constant BHP Theory
Pump Balanced Wei%ht $udPump Balanced Wei%ht $ud
,
+,+
11+
Circulatin0 at 2 spmCirculatin0 at 2 spm
'ntro#uce Balance# 3u#'ntro#uce Balance# 3u#
#ensity balances BHP!#ensity balances BHP!
/ill nee# to a#ust DPP as/ill nee# to a#ust DPP as#rill strin0 $ills with heavy#rill strin0 $ills with heavy
mu#mu#
Pump
6+
+
7/21/2019 Bhp & Well Kill Iadc
27/32
27-Constant BHP Theory
Balanced Wei%ht $ud Has 4eached BitBalanced Wei%ht $ud Has 4eached Bit
,+
+,+
66+
Circulatin0 at 2 spmCirculatin0 at 2 spm
Drill strin0 $ull o$ heavy mu#Drill strin0 $ull o$ heavy mu#
DPP pressure re#uce# toDPP pressure re#uce# to
66+ psi. the $riction pressure66+ psi. the $riction pressureassociate# with the heavierassociate# with the heavier
mu#mu#
Pump
(1105 - 500) x MW2/MW1)
+
7/21/2019 Bhp & Well Kill Iadc
28/32
2,-Constant BHP Theory
+ic) to Surface+ic) to Surface
1%
+,+
66+
Circulatin0 at 2 spmCirculatin0 at 2 spm
:nnulus partially $ille# with:nnulus partially $ille# with
heavy mu#heavy mu#
Casin0 pressure at ma& valueCasin0 pressure at ma& value
BHP still +,+ psiBHP still +,+ psi
Pump
66+
+
7/21/2019 Bhp & Well Kill Iadc
29/32
2;-Constant BHP Theory
#as is Out of Well#as is Out of Well
17+
+,+
66+
Circulatin0 at 2 spmCirculatin0 at 2 spm
:nnulus contains two mu#s:nnulus contains two mu#s
Casin0 pressure re#uce#Casin0 pressure re#uce#
BHP still +,+ psiBHP still +,+ psi
Pump
66+
+
7/21/2019 Bhp & Well Kill Iadc
30/32
%-Constant BHP Theory
Ori%inal $ud is Out of WellOri%inal $ud is Out of Well
+,+
66+
Circulatin0 at 2 spmCirculatin0 at 2 spm
:nnulus contains balance#:nnulus contains balance#
wei0ht mu#wei0ht mu#
Casin0 pressure ) Casin0 pressure )
DPP ) (riction o$ new mu#DPP ) (riction o$ new mu#
BHP still +,+ psiBHP still +,+ psi
Pump
66+
+
7/21/2019 Bhp & Well Kill Iadc
31/32
%1-Constant BHP Theory
Well is 0eadWell is 0ead
+,
Stop PumpsStop Pumps
/ell (ull o$ Balance# /t< 3u#/ell (ull o$ Balance# /t< 3u#
DPP ) DPP )
CP ) CP )
BHP ) +, psiBHP ) +, psi
Pump
7/21/2019 Bhp & Well Kill Iadc
32/32
%2-Constant BHP Theory
SummarySummary
BHP or ) (ormation Pressure stops in$lu&BHP or ) (ormation Pressure stops in$lu&
DP 0a0e is link to BHPDP 0a0e is link to BHP
BHP can be kept constant i$ DP isBHP can be kept constant i$ DP is constant #urin0 circulation with ori0inal mu#constant #urin0 circulation with ori0inal mu#
constant a$ter balance# mu# reaches bitconstant a$ter balance# mu# reaches bit
a#uste# to account $or balance# mu# as it $ills DPa#uste# to account $or balance# mu# as it $ills DP
account $or hi0her #ensityaccount $or hi0her #ensity account $or hi0her $riction pressure in #rill strin0account $or hi0her $riction pressure in #rill strin0