SLIDE 1
Research Question
- What is the optimal configuration of
PWSRCAC Response System Optimization Project PWS RCAC Board - - PowerPoint PPT Presentation
PWSRCAC Response System Optimization Project PWS RCAC Board - - PowerPoint PPT Presentation
PWSRCAC Response System Optimization Project PWS RCAC Board Meeting Meeting May 4, 2017 Research Question What is the optimal configuration of containment, skimming, and storage (primary and secondary) for nine PWS recovery systems
SLIDE 2
SLIDE 3
Weir Skimmer
SLIDE 4
Oleophilic Disc Skimmer
SLIDE 5
Scenario
SLIDE 6
Operational Periods
SLIDE 7
What Are We Optimizing?
- The amount of oil recovered for a given
- perational period
- Trying to match De-rated Encounter Rate with
De-rated Skimmer Rate and make both as high as possible
SLIDE 8
RESULTS
- Open-Water Response Systems
– Base Case – Optimized
- Nearshore Response Systems
– Base Case – Optimized
- Secondary Storage Analysis
– Nearshore
SLIDE 9
Recovered Fluids
SLIDE 10
TRANSREC/GRAMREC - BASE CASE
38,067 bbl
SLIDE 11
CB8 BARGE- BASE CASE
53,012 bbl
SLIDE 12
VALDEZ STAR - BASE CASE
14,290 bbl
SLIDE 13
TRANSREC/GRAMREC - OPTMIZE
SLIDE 14
CB8 BARGE- OPTIMIZE
SLIDE 15
VALDEZ STAR- OPTIMIZE
SLIDE 16
NEARSHORE BASE CASE
5000 10000 15000 20000 25000 1 2 3 4 5 6 7 8 9 10 BBL OP 5000 10000 15000 20000 25000 1 2 3 4 5 6 7 8 9 10 5000 10000 15000 20000 25000 1 2 3 4 5 6 7 8 9 10 OP 5000 10000 15000 20000 25000 1 2 3 4 5 6 7 8 9 10 5000 10000 15000 20000 25000 1 2 3 4 5 6 7 8 9 10 OP 5000 10000 15000 20000 25000 1 2 3 4 5 6 7 8 9 10 BBLFree Water Water in Emulsion Oil
CB4 CB2 J-boom Weir Disc
BBL BBL BBL OP OP
2,236 bbl 1,573 bbl 2,236 bbl 2,076 bbl 1,860 bbl 593 bbl
SLIDE 17
CB4 WEIR - OPTIMIZE
SLIDE 18
CB4 DISC - OPTIMIZE
SLIDE 19
CB2 WEIR - OPTIMIZE
SLIDE 20
CB2 DISC - OPTIMIZE
SLIDE 21
J-BOOM WEIR - OPTIMIZE
Essentially the same as CB4 Weir
SLIDE 22
SECONDARY STORAGE - OPTIMIZE
SLIDE 23
Secondary Storage Optimal
Operating Area Size for 10 Offload Stations
SLIDE 24
Secondary Storage Model
Radius X nm
SLIDE 25
Secondary Storage Model
Secondary Storage Barge
SLIDE 26
Secondary Storage Model
Skimming System Primary Storage Barge
SLIDE 27
Secondary Storage Model
SLIDE 28
Secondary Storage Model
SLIDE 29
Secondary Storage Model
SLIDE 30
Secondary Storage Model
SLIDE 31
Secondary Storage Model
Inputs:
- Radius
- Slick thickness
- OP length
- Time step length
- Number and specs. of skimming systems
- Number and specs. of mini-barges
- Number of offload stations
- Number of iterations
Outputs:
- Status of everything at each time step
- Total fluids recovered
- Total oil recovered
SLIDE 32
Secondary Storage Model
Scenarios:
- Assumed 120 vessels in a scenario
- Varied number of skimmers and and mini-
barges to utilize all 120 vessels (each skimming system uses 3 vessels and each mini-barge uses one vessel)
- e.g. 20 skimmers and 60 mini-barges (20 x
3 + 60 = 120)
- Ran every combination from
- zero skimmers, 120 mini-barges
- 60 skimmers, zero mini-barges
- Ran for weir skimming system with 10 and
18 offload stations on secondary storage barge
- Ran for disc skimming system with 6 and
10 offload stations on secondary storage barge
- Ran for 2 nm to 40 nm radius
- Ran each scenario 100 times
SLIDE 33
Secondary Storage Model
40 20 skimmers 60 mini-barges 19,419 bbl
18 Offload Stations WEIR SKIMMERS 2 nm area
SLIDE 34
Secondary Storage Model
40 14 skimmers 78 mini-barges 13,040 bbl
10 Offload Stations WEIR SKIMMERS 2 nm area
SLIDE 35
Secondary Storage Model
40 M i n i
- b
a r g e
- l
i m i t e d S k i m m e r
- l
i m i t e d
18 Offload Stations WEIR SKIMMERS 2 nm area
SLIDE 36
Secondary Storage Model
40 Mini-barge-limited Skimmer-limited Station-limited
10 Offload Stations WEIR SKIMMERS 2 nm area
SLIDE 37
Secondary Storage Model
SLIDE 38
Secondary Storage Optimal
Weir Skimming Systems
SLIDE 39
Secondary Storage Optimal
Disc Skimming Systems
SLIDE 40
Secondary Storage Optimal
Decanting Mini-Barges
- In OP 4 a weir skimmer can fill a mini-barge in 22 minutes
- When full, the mini-barge will hold 189 bbl of free-water
- The capacity of the de-cant pump is 17 bbl/hr
- Thus it will require 8.9 hours to decant 80% of that free-
water
- Considering the time it would take run back and forth to
the Secondary Storage Barge at 5 kts, rig/de-rig, and pump-out the mini-barge, the mini-barge would have to be at least 20.8 nm away from the Secondary Storage Barge for decanting to make sense.
SLIDE 41
Considerations
- Potential oil recovery is valuable as a comparative metric
- nly.
- Real-world testing and training are critical.
- Oil properties and weather conditions impact results.
- Realistic equipment assumptions are critical.
- Results regarding disc skimmers could apply to oleophilic
skimmers generally.
SLIDE 42
FINDINGS
- Oleophilic skimmers have significant advantages over weir
skimmers due to the lack of free-water recovered.
- The sooner systems are deployed the better total oil
recovery will be for the response.
- Open-water systems are encounter rate limited.
Improvements to these systems can be achieved by increasing the swath-width.
SLIDE 43
FINDINGS
- Nearshore systems are pump rate limited and can be
improved by increasing skimmer capacity.
- Secondary storage will require more offload stations if
weir skimmers are used, compared to disc skimmers.
- The optimal configuration for weir skimming systems is 18
- ffload stations, 20 skimming systems and 60 mini-barges.
- The optimal configuration for disc skimming systems is 10
- ffload stations, 26 skimming systems and 42 mini-barges.
SLIDE 44
FINDINGS
- Total oil recover declines by about 2% per nm from the
secondary storage barge.
- Large operating areas require more mini-barges to operate
efficiently.
- Decanting mini-barges is not efficient.