diacs (scrams) completion at gullfaks cgullfaks … · diacs (scrams) completion at diacs (scrams)...
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DIACS (SCRAMS) completion at DIACS (SCRAMS) completion at Gullfaks CGullfaks C
C-29 a 2 year story
The Gullfaks fieldThe Gullfaks field
Reserves 321 mill SmReserves 321 mill Sm33 oiloil
Produced 277 mill SmProduced 277 mill Sm33 oil oil (02.2001)(02.2001)
Daily production GFC Daily production GFC approximately 13000 Smapproximately 13000 Sm33 (02.2001)(02.2001)
o
C
B-1
2 15'
2800
2700
2500
2600
2700
2400
2800
2700
2600
2700
2650
2400
2300
2200
2900
2500 24
00
2300
2400
2600
2500
2300
2300
2400
2400
2500
2400
2000
2500
2500
2600 2500 2500
2400
2300
2400
21002300
2000
1900
200021
00
2100
2000
2100
2500
14
11
C-2¦
C-8C-7
C-6
C-13
C-4X C-4
C-1
7(F)
13
C-14
A-36(2)
C-12(F)
9C-3
12
A-25A
A
5
A-11
3
B
A-3H(F)
A-5HA-3AH(F)1
A-4H
B-10A
4
C-5
C-17
B-10
B-25
19
A-36
A-41
o61 15'
o61 10'
o 2 15'o 2 10'
o61 10'
o61 15'
o 2 10'
DOMINO SYSTEM
ACCOMODATION ZONE
HORST COMPLEX
4000
3000
5000
0000
1000
2000
4000
3000
5000
0000
1000
2000
1200 14001000800600CDP 400
Statfjord Fm.
Brent Group
Base Cretaceous unconformity
Cretaceous/Tertiary sediments
W E
ACCOMODATION
HORST COMPLEX
Geological setting
DOMINO SYSTEM
Intra-Lomvireflector
SSurfaceurfaceCControlledontrolledRReservoireservoirAAnalysis andnalysis andMMonitoringonitoringSSystemystem
WHAT IS SCRAMS ?WHAT IS SCRAMS ?A SYSTEM FOR DOWNHOLE ZONAL PRODUCTION
CONTROL AND PRESSURE MONITORING
HYDRAULIC LINES FOR SLEEVE OPERATIONELECTRIC LINES FOR SLEEVE OPERATION AND PRESSURE MONITORING
ZONAL ISOLATION PACKERS
ICV "CHOKES" (INTERVAL CONTROL VALVES)PRESSURE SENSORS ANNULUS AND TUBING
TOP STATFJORD MAPTOP STATFJORD MAP
1900
2000
K3
L1
L2
C-29
C-39
(95/99)
(2000)
500m
L2
CROSS SECTION ALONG C-29CROSS SECTION ALONG C-29
"LOWER" STATFJORD
"UPPER" LUNDE
C-29
"UPPER" LUNDE
L2
10-2
0 m
FA
ULT
L1
"LOWER" LUNDE
"UPPER" STATFJORD
70 m
FA
ULT
K3
BASECRETACEOUS
MOD.-GOOD CONTINUITYHIGH PERMEABILITY
MOD. CONTINUITYHIGH PERMEABILITY
MOD. CONTINUITYMOD. - HIGH PERM.
LOW CONT.LOW PERM.
PRODUCTION SCENARIOSPRODUCTION SCENARIOS
No downhole production control in C-29
Sequential production of the reservoir zones in C-29
Drill a new well C-39 to accelerate Statfjordproduction
Downhole production control in C-29
Simultaneous production of all reservoirzones in C-29
Drill a new well based on production experiencein C-29 for optimalization
1900
2000
K3
L1
L2
C-29
C-39
K3
C-39
(original proposedposition)
(2000)
WHAT DOTHE ICVCHOKES
LOOK LIKE ?
.....WELL.....
2/3 OPEN2/3 OPEN 1/3 OPEN1/3 OPEN
WELL INTERVENTIONS CRITICAL FACTORSWELL INTERVENTIONS CRITICAL FACTORS
XMT
UPPER STATFJORD
LOWER LUNDE
UPPER LUNDE
LOWER STATFJORD
The recompletion with drilling rig, including running the Scrams assembly, went according to plan
Increased cost experienceddue to:
1. Pressure control i Statfjord2. Killing of perforation. Fracturation
pressures and kill fluid3. Clearance between Scrams
assembly and liner
Measure diff. pressure acrossdownhole choke vs rate
0 100 200 300 400 500 600 700 800 9000
RATE [Sm3/D]
0
5
10
15
20
25
DIF
FE
RE
NT
IAL
PR
ES
SU
RE
[b
ar]
1/3
3/3
2/3
WELL ON PRODUCTION - PERIODIC TEST NEEDEDWELL ON PRODUCTION - PERIODIC TEST NEEDED1. Multi-rate test2. Establish max. sand free rateFOR EACH ZONE:
0 100 200 300 400 500 600 700 800 9000
RATE [Sm3/D]
230
240
250
260
270
280
290
300
TU
BIN
G P
RE
SS
UR
E
Establish IPRfor each choke setting
1/3
2/3
3/3
-lower Lunde: Mainly water production, possibly due to fracturing and losses during kill operations
OPTIMIZING CHOKE SETTINGSOPTIMIZING CHOKE SETTINGS
0 100 200 300 400 500 600 700 800 900
RATE (Sm3/D)
240
250
260
270
280
290
300
310
320T
UB
ING
PR
ES
SU
RE
(b
ar)
RE
F. L
OW
ER
ST
AT
FJO
RD
UPPER STATFJ 3/3UPPER STATFJ 2/3UPPER STATFJ 1/3LOWER STATFJ 3/3LOWER STATFJ 2/3LOWER STATFJ 1/3UPPER LUNDE 3/3UPPER LUNDE 2/3UPPER LUNDE 1/3LOWER LUNDE 3/3
OPERATINGTUB. PRESS.
EXAMPLE FROM INITIAL CONDITIONS
OPTIMIZED DRAINAGE STRATEGYOPTIMIZED DRAINAGE STRATEGY
C-29
ca 650 m
"LOWER" STATFJORD
BCU
"UPPER" LUNDE
"UPPER" STATFJORD
REVISED C-39
"LOWER" LUNDE
L1 L2
1750
2000
2250
PROPOSEDC-39
NS
As a consequence of installing Scrams, the drilling of a new well, C-39, was postponed until gaining production experienceA revised C-39 is on stream further south (producer and injector)
TEST
TEST
PRESSURES
OIL
RATES apr-99
mai-99jun-99
jul-99aug-99
sep-99okt-99
nov-99des-99
jan-00feb-00
mar-00apr-00
mai-00jun-00
jul-00aug-00
sep-00okt-00
nov-00des-00
jan-01feb-01
0
100
200
300
400
500
600
700
800
900
1000
OIL
RA
TE
[S
m3/
D]
UPPERSTATFJLOWERSTATFJUPPERLUNDELOWERLUNDE
feb-99 mai-99 aug-99 des-99 mar-00 jun-00 okt-00 jan-01 apr-01
Date
250
260
270
280
290
300
310
320
Res
ervo
ir pr
essu
re, b
arLOWER LUNDEUPPER LUNDELOWER STATFJUPPER STATFJ
Ref./1850 m TVD MSL
ECONOMYECONOMY
The value is related to the total development of the areaComparison of 2 cases (from start of Scrams operation):
Case 1: C-29 without Scrams and C-39 in original locationCase 2: C-29 with Scrams and C-39 in revised location further south
How do we evaluate the economic value of Scrams in C-29?
DIFFERENCE IN NET PRESENT VALUEBEFORE TAX, INCLUDINGINVESTMENTS:
apr-1999apr-2001
apr-2003apr-2005
apr-2007apr-2009
apr-2011apr-2013
apr-2015apr-2017
0
500
1000
1500
OIL
RA
TE
Sm
3/d
Scrams in C-29Revised 39
No scrams in C-29C-39 as originally
proposed 100 mill NOK
In favour of the casewith SCRAMS
Production flexibility and optimizationPressure monitoringZonal rate allocationZonal testingAccelerated production and increased recoveryReservoir strategy was optimized based on production experienceExperience from production with downhole flow control
+ -High costs due to complex operations prior to Scrams installation (not Scrams related)Effect of choking of the ICV's in "upper" and "lower" Statfjord is less than required for simultaneous production of all zones Continuous pressure monitoring currently not possible due to technical solutionIncreased water cut from "lower" Lunde (related to kill operation)
SCRAMS IN C-29 - CONCLUSIONSSCRAMS IN C-29 - CONCLUSIONS