Painting the pores
18
1 - Classification: Internal Painting the pores Gullfaks Diverging Pilot Well A-35 Author: Rune Instefjord,
description
Painting the pores. Gullfaks Diverging Pilot Well A-35 Author: Rune Instefjord,. Outline. Introduction to the Chemicals. How does the chemicals work. Planning of pilot on Gullfaks Selection of pilot area Simulation Implementation Summing up. Abiogel coat. Introduction to Abio gel. - PowerPoint PPT Presentation
Transcript of Painting the pores
1 - Classification: Internal
Painting the poresGullfaks Diverging Pilot
Well A-35Author: Rune Instefjord,
2 - Classification: Internal
Outline
• Introduction to the Chemicals.
• How does the chemicals work.
• Planning of pilot on Gullfaks
− Selection of pilot area
− Simulation
• Implementation
• Summing up
3 - Classification: Internal
Introduction to Abio gel
• Abio gel is compound, consisting primarily of Sodium silicate. When Abio gel is brought into contact with divalent cations (i.e. Ca and Mg) in formation- or seawater it reacts to form a microcrystalline suspension which may become a stiff gel if concentration of divalent cations exceeds about 1 %. Otherwise it behaves as a cement paint coating the rock matrix.
Abiogel coat
• narrow the flow channels gradually
• keep certain permeability
• in favor of indepth fluid diversion
The following text and illustration is
provided by CNPC
Abiogel is actually a gel used in chromatography and is also a brand name for cement paint
4 - Classification: Internal 2011-08-18
Gullfaks flow diversion project
A-35
A-39A
A-38
A-38A
A-17
B-37
A-2AH
A-1H
A-5H
457200 457600 458000 458400
457200 457600 458000 458400
67
8200
06
782
400
67
8280
06
783
200
67
8360
06
784
000
67
820006
782400
67
828006
783200
67
836006
784000
Injection water
Oil 0.16
0.32
0.48
0.64
0.8
0.96
So
0 100 200 300 400 500m
1:10000
—— 01/06/2008 剩余油饱和度分布图
Bypassed oil
• 1000 ton chemicals (silica based) injected into the injector A-35.
• The chemicals is environmental classified as yellow. It is environmentally acceptable and unproblematic to use.
• The chemicals shall move into the reservoir and form micro gel particles, which will stick to the surface of the pores and thereby reducing the permeability in invaded zones.
• The water will be forced to find new paths and invade less water flooded areas.
• Hit bypassed oil and increase the oil recovery.
5
5
Illustration of water diverging
• Important issues:
- Improve the volumetric sweep efficiency.
-Reduce permeability and reduce flow of water in existing water channels. Divert water into unswept areas.
- Alternative to drilling of new wells into areas with very uncertain flooding pattern.
6 - Classification: Internal 2011-08-18
6
Illustration of water diverging
Classification
: Internal
Status: Draft
A-35
A-39A
A-38
A-38A
A-17
B-37
A-2AH
A-1H
A-5H
457200 457600 458000 458400
457200 457600 458000 458400
67
82
00
06
78
24
00
67
82
80
06
78
32
00
67
83
60
06
78
40
00
67
82
00
06
78
24
00
67
82
80
06
78
32
00
67
83
60
06
78
40
00
Injection water
Oil0.12
0.24
0.36
0.48
0.6
0.72
0.84
0.96
So
0 100 200 300 400 500m
1:10000
—— 01/06/2008 剩余油饱和度分布图
A-35
A-39A
A-38
A-38A
A-17
B-37
A-2AH
A-1H
A-5H
457200 457600 458000 458400
457200 457600 458000 458400
67
82
00
06
78
24
00
67
82
80
06
78
32
00
67
83
60
06
78
40
00
67
82
00
06
78
24
00
67
82
80
06
78
32
00
67
83
60
06
78
40
00
Injection water
Oil 0.16
0.32
0.48
0.64
0.8
0.96
So
0 100 200 300 400 500m
1:10000
—— 01/06/2008 剩余油饱和度分布图
A-35
A-39A
A-38
A-38A
A-17
B-37
A-2AH
A-1H
A-5H
457200 457600 458000 458400
457200 457600 458000 458400
67
82
00
06
78
24
00
67
82
80
06
78
32
00
67
83
60
06
78
40
00
67
82
00
06
78
24
00
67
82
80
06
78
32
00
67
83
60
06
78
40
00
Injection water
Oil 0.16
0.32
0.48
0.64
0.8
0.96
So
0 100 200 300 400 500m
1:10000
—— 01/06/2008 剩余油饱和度分布图
A-35
A-39A
A-38
A-38A
A-17
B-37
A-2AH
A-1H
A-5H
457200 457600 458000 458400
457200 457600 458000 458400
67
82
00
06
78
24
00
67
82
80
06
78
32
00
67
83
60
06
78
40
00
67
82
00
06
78
24
00
67
82
80
06
78
32
00
67
83
60
06
78
40
00
Injection water
Oil 0.16
0.32
0.48
0.64
0.8
0.96
So
0 100 200 300 400 500m
1:10000
—— 01/06/2008 剩余油饱和度分布图
layer36 layer38 layer40 layer42
A-35
A-39A
A-38
A-38A
A-17
B-37
A-2AH
A-1H
A-5H
457200 457600 458000 458400
457200 457600 458000 458400
67
82
00
06
78
24
00
67
82
80
06
78
32
00
67
83
60
06
78
40
00
67
82
00
06
78
24
00
67
82
80
06
78
32
00
67
83
60
06
78
40
00
Injection water
Oil 0.16
0.32
0.48
0.64
0.8
0.96
So
0 100 200 300 400 500m
1:10000
—— 01/06/2008 剩余油饱和度分布图
A-35
A-39A
A-38
A-38A
A-17
B-37
A-2AH
A-1H
A-5H
457200 457600 458000 458400
457200 457600 458000 458400
67
82
00
06
78
24
00
67
82
80
06
78
32
00
67
83
60
06
78
40
00
67
82
00
06
78
24
00
67
82
80
06
78
32
00
67
83
60
06
78
40
00
Injection water
Oil 0.16
0.32
0.48
0.64
0.8
0.96
So
0 100 200 300 400 500m
1:10000
—— 01/06/2008 剩余油饱和度分布图
A-35
A-39A
A-38
A-38A
A-17
B-37
A-2AH
A-1H
A-5H
457200 457600 458000 458400
457200 457600 458000 458400
67
82
00
06
78
24
00
67
82
80
06
78
32
00
67
83
60
06
78
40
00
67
82
00
06
78
24
00
67
82
80
06
78
32
00
67
83
60
06
78
40
00
Injection water
Oil 0.16
0.32
0.48
0.64
0.8
0.96
So
0 100 200 300 400 500m
1:10000
—— 01/06/2008 剩余油饱和度分布图
layer44 layer46 layer48 layer49
A-35
A-39A
A-38
A-38A
A-17
B-37
A-2AH
A-1H
A-5H
457200 457600 458000 458400
457200 457600 458000 458400
67
82
00
06
78
24
00
67
82
80
06
78
32
00
67
83
60
06
78
40
00
67
82
00
06
78
24
00
67
82
80
06
78
32
00
67
83
60
06
78
40
00
Injection water
Oil 0.16
0.32
0.48
0.64
0.8
0.96
So
0 100 200 300 400 500m
1:10000
—— 01/06/2008 剩余油饱和度分布图
Plane remaining oil mainly distributes out of the main water streamline region and in the bottom low permeability formations
Remaining Oil Distribution
8 - Classification: Internal
Introduction to Gullfaks
Discovered: 1978Start production: 1986 STOOIP: 599 MSm³Base oil reserves: 365 MSm3
Produced to date: 351 MSm3
• Recovery of base reserve: 96%• Overall expected recovery: 61%• Overall recovery pr. 2011: 59%
Current daily production: 14 kSm3
Current average water cut: 84 %Initial pressure/temperature: 310-
320 bar/ 71 oC at 1850m TVD MSLBubble point pressure: ~200-240
bar at 1850m TVD MSLGOR: ~ 100 Sm³/Sm³ Oil viscosity: ~ 0.5 – 1 cp
Gullfaks
Norway
Iceland
Ireland UK
North SeaSweden
Denmark
Germany
Finland
Russia
9
Pilot area: Lower Brent, segment H1
• Segment selected for a water based chemical method.
• STOOIP in lower Brent is 20,3 MSm³ oil.
• Lower Brent in H1 has ”only” 57 % recovery factor.
• Potential 2 - 5 MSm³ mobile oil left.
• Relatively isolated segment.
• A lot of data is collected in this area. It was the first production area and therefore a lot of good, initial data.
• 2 active wells in lower Brent, A-35 (injector) and A-39A (producer).
• 2 active producers in upper Brent, B-37 and A-38A.
• Pressure communication between B-37 and lower Brent. No communication with A-38A?
• Problem with H2S in A-39A. B-37 may also give a H2S
problem.
10 - Classification: Internal
One-dimensional model to simulate sand pack experiment
Parameter adjustment
Simulation
− Establish a History Matched (HM) simulation model for the H1-segment
− Understand the mechanism of the chemicals and find the relevant parameters
− Make predictions using the optimal simulation tool and – method using restart from the HM model
11 20.04.23 Classification: Internal
Operation, offshore setup
Scandi Flora at the North Shaft (NS)
Hose hanger @ BOP deck NS
Connection to Chicksan 2” line
KillWing Valve @ WellHead
12 20.04.23 Classification: Internal
Events each batch
• Mixing chemicals at CCB, Ågotnes outside Bergen.
• 15-20 % wt. solution mixed in Fresh Water.
• Mixed max 800 m³ of solution due to regulations by the government.
• Scandi Flora transported and pumped the chemicals into A-35.
• Start injection 17.09.
• 100 m³ KCl preflush and postflush, rate: 1 000 m³/d in the 2 first batches.
• Injected 150 - 800 m³ solution with chemicals at rate: 1 000 - 2000 m³/d.
• Density of the liquid was 1.23. Viscosity around 3.5 cP. PH around 13.
• End injection 06.11.
• Restrictions on wave height. Maximum 3 m due to hook up between vessel and platform.
13 20.04.23 Classification: Internal
Batch 1
Before 1st Batch treatment DHP for inj. rate 2000 sm3/d was 296bara, after treatment DHP
stabilized around 280bara. This effect was interpreted as stimulation of the well.
14 20.04.23 Classification: Internal
Pressure details batch 1
Start chemical injection
End chemical injection
Start KCl postflush
Start KCl preflush
Stop KCl
preflush
Start SW injection
15 Classification: Internal 2011-09-19
Well shut in
Start chemical injection
Drop due to density
Start SW injection
Increase due to density
Pressure 4th batch (part 1)
16 20.04.23 Classification: Internal
SW inj. pressure after each batchDevelopment of DHP in A-35 after Injection of WJSTP-A Batches
265.0
267.5
270.0
272.5
275.0
277.5
280.0
282.5
285.0
287.5
290.0
292.5
295.0
297.5
300.0
302.5
00:00 01:30 03:00 04:30 06:00 07:30 09:00 10:30 12:00
Hours from start of SW injection after each batch
DH
P, b
ara
Batch1, 2150sm3/d Batch2, 2000sm3/d Batch3, 1920sm3/d Batch4p1, 1750sm3/d Batch4cont, 1920sm3/d
Batch5p1, 1900sm3/d Batch5p2, 1880sm3/d Batch6, 1880sm3/d Batch7, 1890sm3/d Batch8, 1920sm3/d
Summary
• Successful operation but used some more time than planned due to weather conditions.
• It is to early to see any IOR in the producers, so we do not know the answer on the questions!
• We expect increased oil production in the producers after around 1 year.
• Have technical problems in one of the wells per today and the well are therefore shut in. This may worsen the interpretation of the pilot.
• First multi well diverging project in the North Sea. If success it may give a lot of increased oil for more fields than only Gullfaks.
17 - Classification: Internal
18 - Classification: Internal
Presentation title
Presenters name
Presenters title
E-mail address, tel: +00 00 00 00
www.statoil.com
Thank you
