![Page 1: Offshore platform FEED - ocw.snu.ac.krocw.snu.ac.kr/sites/default/files/NOTE/FfOP_Lecture (4).pdf · Slug Catcher Gas Sweetening Gas Dehydration Gas Exporting Compression to HP MP](https://reader030.vdocuments.us/reader030/viewer/2022041215/5e046c712f569542596920dc/html5/thumbnails/1.jpg)
Offshore platform FEED
Yutaek Seo
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Processing in offshore platforms
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Oil Fluid
(Black / Volatile Oil)
Gas Fluid
(Dry / Wet /
Retrograde Gas)
Crude Oil
Associated Gas
Produced Water
Stabilized Oil
Sales Gas
Re-injection Gas
Re-injection Water
Water Disposal
Gas
Condensate
Produced Water
Stabilized Condensate
Sales Gas
LPG (C3 & C4)
Water Disposal
Reservoir Wellbore HC Products
CPF Process General
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Slug
Catcher
Gas
Sweetening
Gas
Dehydration
Gas
Exporting
Compression
to HP
MP
Separator
Oil
Stabilizer
Gas
Refrigeration
LP
Separator
De-salter
System
Compression
to MP
Stabilized oil
to tank
Re-injection for IOR /
EOR or gas lifting
Sales gas
Oil Well-
fluid
Gas Stream
Liquid HC stream
Well Fluid Stream
For Dew Point Control
Typical CPF : Oil Field
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Slug
Catcher
Gas
Sweetening
Gas
Dehydration
Gas
Exporting
Inlet
Separator
Gas
Refrigeration
Condensate
Stabilizer
Compression
to HP
Stabilized condensate to tank
Sales gas
Gas Well-
fluid
For Dew Point Control
Typical CPF : Gas Field (1)
Gas Stream
Liquid HC stream
Well Fluid Stream
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Slug
Catcher
Gas
Sweetening
Gas
Dehydration
Gas
Exporting
Inlet
Separator
Gas
Refrigeration
Condensate
Stabilizer
Compression
to HP
Stabilized condensate to tank
Sales gas
Gas Well-
fluid
LPGNGL
Recovery
For NGL Recovery
Typical CPF : Gas Field (2)
Gas Stream
Liquid HC stream
Well Fluid Stream
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Liquid Flow Rate [bbl/d] / CPF Entrance
SARB-4_Subsea Flow-line (Length = 33 km)
Inlet Flow Rate
(11,562 STB/d)
Liquid Slug Problem : Normal Operation
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SARB-4_Subsea Flow-line (Length = 33 km)
Pigging Operation / Liquid Flow Rate [bbl/d] / CPF Entrance
Severe Slugging
Liquid Slug Problem : Pigging
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Subsea
Template
Well #1 Well #2
9 km
12”
Flowline
PT
Choke
Valve
MPM
Multiphase
Flowmeter
PT
Heater
Test
Manifold
Production
Manifold
PT
Satellite
Field
Host
PlatformMultiphase
Transport
15 m
145 m
12” RiserPressure
Transmitter
Subsea
Template
Well #1 Well #2
9 km
12”
Flowline
PT
Choke
Valve
MPM
Multiphase
Flowmeter
PT
Heater
Test
Manifold
Production
Manifold
PT
Satellite
Field
Host
PlatformMultiphase
Transport
15 m
145 m
12” Riser
Subsea
Template
Well #1 Well #2
9 km
12”
Flowline
PT
Choke
Valve
MPM
Multiphase
Flowmeter
PT
Heater
Test
Manifold
Production
Manifold
PT
Satellite
Field
Host
PlatformMultiphase
Transport
15 m
145 m
12” RiserPressure
Transmitter
Slug Catcher GOOOOD
For Accommodation of Liquid Slug
Control vs. Big vessel
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Process flow for separation
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Separation trains
Separation of oil, gas, and water
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Multi Stage Separator Stabilization Column
Without Reflux
1) It is preferred for “Condensate stabilization”.
2) It is used for “Oil Stabilization” for H2S < 50 ppm and lower RVP.
With Reflux
1) It is preferred for “Crude oil separation and stabilization”.
Oil / Condensate Stabilization (1)
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SARB-4 Project (Oil Reservoir)
MP
Separator
LP
Separator
Oil from HP Sep. Gas to HP Com.
Gas to MP Com.
Fresh Water
To Produced Water
Treatment
To Produced Water
Treatment
To Produced Water
Treatment
Desalter
8.3 barg
0.7 barg
7 barg
1. Multistage separation + Stabilization column (stripper type)
2. Design for 1) maximized oil production and 2) minimized H2S ppm
3. Heavy condensate was used for striping un-stabilized oil for preventing scale problems in the reboiler
Heavy Condensate
To Produced Water
Treatment
Gas to LP Com.
Stabilized Oil to Degasser Drum
(RVP = 8 psia)
Oil Stabilizer
(Stripping Type)
1 barg
90 oC
49 oC91 oC
Reflux System
Example for Oil Stabilization
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Touat-Gaz Project (Gas Reservoir)
To Produced Water Treatment
Stabilized Condensate
Recycled Gas
From Cold
Separator
From TEG
Inlet Scrub.
From
Comp.
To Produced
Water
Treatment
From Slug
Catcher.
Recycled Gas
MIDYAN Project (Gas Reservoir)
Stabilized Condensate
From Inlet
Separators
From Comp.
From TEG
Inlet Scrub.
From Cold
Separator
Note 1) Touat-Gaz CPF does not have Slug Catcher.
To Produced
Water
Treatment
Example for Condensate Stabilization
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Touat-Gaz Project (Gas Reservoir)
Recycled Gas
From Cold
Separator
From TEG
Inlet Scrub.
From
Comp.
From Slug
Catcher.
Recycled Gas
MIDYAN Project (Gas Reservoir)
Stabilized Condensate
(RVP = 6.3 psia)
From Inlet
Separators
From Comp.
From TEG
Inlet Scrub.
From Cold
Separator
2 oC40 oC
44 oC95 oC
10 barg
200 oC
152 oC
126 oC
-10 oC22 oC
0.1 oC
35 oC
126 oC
9 barg
188 oC
52 oC
76 oC 60oC
API 66
API 86
Stabilized Condensate
(RVP = 6.3 psia)
Example for Condensate Stabilization
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Crude oil export via tanker
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Water treatment
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Gas collection and compression
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Most of the CPFs use TEG
Gas Dehydration Unit (1)
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For TEG Dehydration Unit Design
1. Determine Lean TEG Inlet Flow Rate
(2 – 5 gal / removed water lb)
2. Determine Lean TEG Concentration
3. Determine introducing Gas Stripper
or DRIZO
Most of the CPFs use TEG
Gas Dehydration Unit (2)
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Gas dehydration
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Mechanical Refrigeration
Dew point control via refrigeration
• Refrigeration
: The most common method used for gas dew point control is mechanical
refrigeration. This technology is suited especially when pressure is not
available to be used to self refrigerate the gas.
: Two variations exist of this process. one that recycles the stabilizer
overhead to the front end of the plant, used to maximize the recovery of
certain components, and a second that re-injects the stabilizer overhead in
the residue gas stream.
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• J-T valve
: If the raw gas is at high pressure, the removal of hydrocarbons
can be accomplished by refrigeration obtained through the
expansion of gas by means of a Joule -Thomson valve.
: Injection of glycol is required to prevent the formation of hydrates.
J-T Valve
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• Turboexpander: This process is a variation of the Low Temperature Separation process in
which the pressure hold in the gas is used to move an expander turbine,
which in the isoentropic expansion generates refrigeration and exports
mechanical work.
: This work is used to drive a compressor to partially restore the gas
pressure.
Turbo Expander
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In the CPF, NGL recovery unit plays a role of LPG extraction from Gas / Condensate
NGL Recovery Unit
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Well Test Data Analysis
(Fluid / Flowing P & T)
Client Requirements & Onshore or Offshore?
Block Flow Diagram
Completion
CPF Design Completion
Process and Equipment Design / PFD & PID …
Main Product (sales gas / stabilized oil / LPG) &
EOR (or IOR) & CCS? 1) EOR : Enhanced Oil Recovery
2) IOR : Improved Oil Recovery
Design approach
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Project Reservoir
FluidProduct IOR 1) / EOR 2) CCS 3)
SARB-4
(UAE_Abu dhabi)Oil
Stabilized Oil
Reinjection Gas
Y
(Gas/Water Injection)N
TouatGaz
(Algeria)Gas
Sales Gas
Stabilized CondensateN Y
MIDYAN
(Saudi)Gas Sales Gas N N
AKKAS
(Iraq)Gas
Sales Gas
Stabilized CondensateN N
RHIP
(Oman)Gas
Sales Gas
Stabilized Condensate
LPG
Y
(SG Injection)Y 4)
Note 1> IOR means “Improved Oil Recovery” as technology for 2nd and 3rd recovery
2> EOR means “Enhanced Oil Recovery” as technology for 3rd recovery
3> CCS means “Carbon Capture & Storage”
4> RHIP process includes CO2 EOR facilities for another oil field. CO2 EOR plays a role of CO2 storage role as well as enhanced production.
Project Comparison
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Source : “Process Description”, SARB-4 FEED PKG
CPF (Central Processing Facilities)
Artificial Island
Artificial Island
※ Artificial Islands play a role of WHP.
Work-scope
1. Process Design on CPF (Zirku Island)
2. Process Design on Artificial Islands
3. Hydraulics on subsea pipeline
4. Flow assurance on subsea pipelines
Product (CPF)
1. Stabilized oil (200,000 stb/d)
2. Reinjection gas and fuel gas
3. Reinjection water (sea water)
Ex. SARB-4 (Client : ADMO-OPCO / Abu Dahbi)
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Slug
Catcher
1st Gas
Compression
Gas
Dehydration
Compression
to HP
MP
Separator
Oil
Stabilizer
2nd Gas
Compression
LP
Separator
De-salter
System
Compression
to MP
Stabilized oil
to tank
Re-
injection
Gas
Sweetening
3rd Gas
Compression
Fuel gas
Condensate
Processing
Vapor
Recovery
Gas (< LP)
Sea Water Treating for IORProduced Water Treating
Oil Well-
fluid
30 barg
70 barg
172 barg 414 barg
8.3 barg 0.7 barg
7 barg
1 barg
0.3 - 0.5 barg
For IOR
Injection Water
Ex. SARB-4 Project (Client : ADMO-OPCO)
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Source : “Gathering System Design Philosophy”, P99065-S00-PHIL-U-02, AKKAS CPF FEED Document
AKKAS Gas Field Location AKKAS Well-pads & CPF
Work-scope
1. Process Design on CPF
2. Hydraulics on Flowline / Trunkline / Export PL
3. Flow assurance on Flowline / Trunkline / Export PL
Product (CPF)
1. Sales Gas (480 MMSCFD)
2. LPG (8.3 MBPD)
3. Stabilized Condensate (16.8 MBPD)
Iraq
Syria
Jordan
Turkey
Iran
AKKAS Gas Field Project
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Unit Value
Water Dew Point @ 70 barg oC -12
Hydrocarbon Dew Point @ 70 barg oC -8
H2S Content ppm 7.5 max
RSH (Mercaptans) Content ppm 15 max
CO2 Content vol % 2.5 max
Unit Value
RVP (Summer) kPa 800
RVP (Winter) kPa 1,000
Ethane vol % 0.6 max
C5+ vol % 2 max
Sulphur Content mg/m3 343 max
Water Content - 0 (water free)
Sales Gas Specification
LPG Specification
Stabilized Condensate Specification 9.6 psia (0.66 bara)
Product Specification
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Slug
Catcher
Gas
Dehydration
Gas
Exporting
Inlet
Separator
Gas
Refrigeration
Condensate
stabilizer
Sales gas
Gas StreamLiquid HC streamWell Fluid Stream
Stabilized
Condensate
Fuel Gas
Gas processing concept
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Slug
Catcher
Inlet Separator
TEG
Contactor
ChillerLT
Separator
Export Gas
Compressor
Flash Gas
Compressor
Condensate
Stabilizer
Sales Gas
Produced Water
Oily Water
Lean TEG
Condensate
Fuel Gas
FEED Design for FCP-2015
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Slug
Catcher
Inlet Separator
TEG
Contactor
ChillerLT
Separator
Export Gas
Compressor
Flash Gas
Compressor
Condensate
Stabilizer
Sales Gas
Produced Water
Oily Water
Lean TEG
Condensate
Fuel Gas
1. Slug Size 40 m3
2. No compositional
Model
3. No transient analysis
1. De-C2 is possible to become “Condensate Stabilizer” role.
2. Condensate stabilizer for FCP-2015 is not needed.
3. RVP should be reduced from 9.6 to 6.3 psia.
Verification Result for FCP-2015
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Slug
Catcher
Inlet Separator
TEG
Contactor
ChillerLT
Separator
Export Gas
Compressor
Flash Gas
Compressor
De-C2
De-C3 De-C4
Sales Gas
LPG (C3/C4)
Condensate
Produced Water
Oily Water
Lean TEG
Fuel Gas
FEED Design for PP-2017
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Slug
Catcher
Inlet Separator
TEG
Contactor
ChillerLT
Separator
Export Gas
Compressor
Flash Gas
Compressor
De-C2
De-C3 De-C4
Sales Gas
LPG (C3/C4)
Condensate
Produced Water
Oily Water
Lean TEG
1. Slug Size 40 m3
2. No compositional
Model
3. No transient
analysis
HD / WI
HD / WI
HD / WIHD / WI
HD / WI
Free Water
Formation
(Pressure increase
required)
Not
required.
Not required
Flash gas compressor capacity
is significantly in excess.
Fuel Gas
TVP
= 13 psia
55 barg
30 barg
55 barg
0.9 lb/mmscf
42 oC 40 oC
-9 oC
52 barg-30 oC
25 barg
-44 oC
Not required
52 barg-30 oC
Verification Result for PP-2017
![Page 37: Offshore platform FEED - ocw.snu.ac.krocw.snu.ac.kr/sites/default/files/NOTE/FfOP_Lecture (4).pdf · Slug Catcher Gas Sweetening Gas Dehydration Gas Exporting Compression to HP MP](https://reader030.vdocuments.us/reader030/viewer/2022041215/5e046c712f569542596920dc/html5/thumbnails/37.jpg)
Slug
Catcher
Inlet Separator
TEG
Contactor
ChillerLT
Separator
Export Gas
Compressor
Flash Gas
Compressor
De-C2
De-C4
Sales Gas
Produced Water
Oily Water
Lean TEG
LPG (C3/C4)
Condensate
0.3 lb/mmscf
Fuel Gas
31 barg
De-C4 Bttm
Cold Liquid 1
Cold Liquid 2
Cold Liquid 1
Cold Liquid 2
Cold Liquid 2
Lean TEG
Cooled Lean TEG
Cold Liquid 3
Cooled Lean TEG
De-C4 Bttm
Cold Liquid 3
11 oC
Air
cooled
HC
Air cooled HC
19 oC
No FW
Fuel Gas
235 oC 211 oC 60 oC 50 oC
55 barg
31 barg
55 barg
TVP
= 9.6 psia
-2 oC
-30 oC
52 barg
Revised Design (Alternative Case) for PP-2017
![Page 38: Offshore platform FEED - ocw.snu.ac.krocw.snu.ac.kr/sites/default/files/NOTE/FfOP_Lecture (4).pdf · Slug Catcher Gas Sweetening Gas Dehydration Gas Exporting Compression to HP MP](https://reader030.vdocuments.us/reader030/viewer/2022041215/5e046c712f569542596920dc/html5/thumbnails/38.jpg)
Unit
FCP-2015 PP-2017 PP-2030
FEED Alter FEED Alter FEED Alter
LPG
RVP [kPa] - - 851.8 844.7 815.5 815.5
C2- [%] - - 0.35 0.37 0.23 0.37
C5+ [%] - - 1.60 1.61 1.57 1.60
Product Rate1) [t/d] - - 567 532 546 525
Stabilized
Condensate
RVP [psia] 9.597 6.300 6.433 6.400 9.796 9.149
Product
Rate[t/d] 530 526 1,747 1,743 732 717
dfs
Note 1) LPG production should be guaranteed as over 500 ton/d at the begging of PP-2017.
Comparison with FEED Design
![Page 39: Offshore platform FEED - ocw.snu.ac.krocw.snu.ac.kr/sites/default/files/NOTE/FfOP_Lecture (4).pdf · Slug Catcher Gas Sweetening Gas Dehydration Gas Exporting Compression to HP MP](https://reader030.vdocuments.us/reader030/viewer/2022041215/5e046c712f569542596920dc/html5/thumbnails/39.jpg)
Comments from the client,
1) LPG RVP unit must be revised from psia to kPa.
2) LPG product must consider C3/C4 ratio according to production season.
Unit Before the revision After the revision
LPG
RVP -(S) 800 psia (55 bar)
(W) 1,000 psia (68 bar)
(S) 800 kPa
(W) 1,000 kPa
C2- [%] 0.6 0.6
C5+ [%] 2.0 2.0
C3 [%] No limitation(S) 30 – 40
(W) 60 – 70
C4 [%] No limitation(S) 60 – 70
(W) 30 - 40
C3 /C4 - No limitation(S) 0.43 – 0.67
(W) 1.50 – 2.33
However
![Page 40: Offshore platform FEED - ocw.snu.ac.krocw.snu.ac.kr/sites/default/files/NOTE/FfOP_Lecture (4).pdf · Slug Catcher Gas Sweetening Gas Dehydration Gas Exporting Compression to HP MP](https://reader030.vdocuments.us/reader030/viewer/2022041215/5e046c712f569542596920dc/html5/thumbnails/40.jpg)
For client request (1) : LPG RVP unit must be revised. ((S) 800 psia, (W) 1,000 psia)
For client request (2) : LPG product must consider C3/C4 ratio according to production season.
C2- removal in LPG is useless for revised RVP.
C3 content in LPG must be reduced for revised RVP.
Operation condition and a method for reducing C3 and increasing C4 should be devised.
To deal with the requests
![Page 41: Offshore platform FEED - ocw.snu.ac.krocw.snu.ac.kr/sites/default/files/NOTE/FfOP_Lecture (4).pdf · Slug Catcher Gas Sweetening Gas Dehydration Gas Exporting Compression to HP MP](https://reader030.vdocuments.us/reader030/viewer/2022041215/5e046c712f569542596920dc/html5/thumbnails/41.jpg)
Slug
Catcher
Gas
Dehydration
Gas
Exporting
Inlet
Separator
Gas
Refrigeration
De-C2
System
De-C4
System
Sales gas
LPG
Gas StreamLiquid HC streamWell Fluid Stream
Stabilized
Condensate
Fuel Gas
Before Revision
Modification of the process
![Page 42: Offshore platform FEED - ocw.snu.ac.krocw.snu.ac.kr/sites/default/files/NOTE/FfOP_Lecture (4).pdf · Slug Catcher Gas Sweetening Gas Dehydration Gas Exporting Compression to HP MP](https://reader030.vdocuments.us/reader030/viewer/2022041215/5e046c712f569542596920dc/html5/thumbnails/42.jpg)
Slug
Catcher
Gas
Dehydration
Gas
Exporting
Inlet
Separator
Gas
Refrigeration
De-C2
System
De-C4
System
Sales gas
LPG
Gas StreamLiquid HC streamWell Fluid Stream
Stabilized
Condensate
Condensate
Stabilizer
Unstabilized
Condensate
Fuel Gas
After Revision
For soluble water
removal
Production
(S) 505 ton/d
(W) 570 ton/d
Solution Devised for Client Requests
![Page 43: Offshore platform FEED - ocw.snu.ac.krocw.snu.ac.kr/sites/default/files/NOTE/FfOP_Lecture (4).pdf · Slug Catcher Gas Sweetening Gas Dehydration Gas Exporting Compression to HP MP](https://reader030.vdocuments.us/reader030/viewer/2022041215/5e046c712f569542596920dc/html5/thumbnails/43.jpg)
Slug
Catcher
Inlet Separator
TEG
Contactor
Chiller
LTS
Export Gas
Compressor
Flash Gas
Compressor
De-C2
De-C4
Sales Gas
Produced Water
Oily Water
LPG (C3/C4)
52 barg
Condensate
Stabilizer
Fuel Gas
Unstabilized Condensate
1st Cooled FS
Stabilized
Condensate
HX 1
HX 1 HX 2
HX 2
PP-2017
Solution Devised for Client Requests
![Page 44: Offshore platform FEED - ocw.snu.ac.krocw.snu.ac.kr/sites/default/files/NOTE/FfOP_Lecture (4).pdf · Slug Catcher Gas Sweetening Gas Dehydration Gas Exporting Compression to HP MP](https://reader030.vdocuments.us/reader030/viewer/2022041215/5e046c712f569542596920dc/html5/thumbnails/44.jpg)
Slug
Catcher
Inlet Separator
TEG
Contactor
Chiller
LTS
Export Gas
Compressor
Flash Gas
Compressor
De-C2
De-C4
Sales Gas
Produced Water
Oily Water
LPG (C3/C4)
WC :
2-3 ppm
Lean TEG, 99.99 wt%
52 barg
Condensate
Stabilizer
Fuel Gas
Unstabilized Condensate
(W) -27 oC
(S)-42 oC / (W)-38 oC
DRIZO Required
for Lean TEG
52 barg
30 barg
1st Cooled FS
Stabilized
Condensate
HX 1
HX 1 HX 2
HX 2
(S) -30 oC
Summer
C3 Rec. : 0.19
C4 Rec. : 0.81
Winter
C3 Rec. : 0.81
C4 Rec. : 0.94
Chiller
Duty (S) : 14.1 MW
Duty (W) : 10.2 MW
De-C2 Reboiler
Duty (S) : 14.5 MW
Duty (W) : 8.8 MW
De-C3 Reboiler
Duty (S) : 10.6MW
Duty (W) : 2.7 MW
Cond.Sta Reboiler
Duty (S) : 8.4 MW
Duty (W) : 9.4 MW
Production
(S) 505 ton/d
(W) 570 ton/d
(S) 1770 ton/d
(W) 1754ton/d
480 MMSCFD
PP-2017
Reflux Ratio
(S) 5.41
(W) 1.03
Solution Devised for Client Requests
![Page 45: Offshore platform FEED - ocw.snu.ac.krocw.snu.ac.kr/sites/default/files/NOTE/FfOP_Lecture (4).pdf · Slug Catcher Gas Sweetening Gas Dehydration Gas Exporting Compression to HP MP](https://reader030.vdocuments.us/reader030/viewer/2022041215/5e046c712f569542596920dc/html5/thumbnails/45.jpg)
Unit Required Spec.
PP-2017
FEEDSolution
Devised
LPG
RVP [kPa](S) 800
(W) 1,000851.8
(S) 692
(W) 897
C2- [%] 0.6 0.35(S) About 0.00
(W) 0.35
C5+ [%] 2 1.60(S) 1.61
(W) 1.61
Product Rate1)
[t/d]> 500
(@ PP-2017)567
(S) 505
(W) 570
C3/C4 -(S) 0.43 – 0.67
(W) 1.50 – 2.33
(S) 0.66
(W) 1.65
Stabilized
Condensate
RVP [psia] 9.8 6.433(S) 6.400
(W) 6.400
Product
Rate[t/d] - 1,747
(S) 1,770
(W) 1,754dfs
: Devised solution is good to satisfy all requirements
Products summary
![Page 46: Offshore platform FEED - ocw.snu.ac.krocw.snu.ac.kr/sites/default/files/NOTE/FfOP_Lecture (4).pdf · Slug Catcher Gas Sweetening Gas Dehydration Gas Exporting Compression to HP MP](https://reader030.vdocuments.us/reader030/viewer/2022041215/5e046c712f569542596920dc/html5/thumbnails/46.jpg)
For stable operation (preventing hydrate, water freezing and free water),
For LPG product spec. (satisfying production rate, C3/C4 value, RVP and so on)
Water content in dehydrated gas should be 2 – 3 ppm (about 0.1 lb/mmscf). (DRIZO)
Condensate stabilizer should be introduced.
De-C2 inlet fluid should be cooled for higher C3 and C4 recovery.
C3/C4 and RVP control can be De-C2 re-boiler duty control and De-C3 reflux ratio.
Conclusion
![Page 47: Offshore platform FEED - ocw.snu.ac.krocw.snu.ac.kr/sites/default/files/NOTE/FfOP_Lecture (4).pdf · Slug Catcher Gas Sweetening Gas Dehydration Gas Exporting Compression to HP MP](https://reader030.vdocuments.us/reader030/viewer/2022041215/5e046c712f569542596920dc/html5/thumbnails/47.jpg)
Thank you!