In-line Subsea Sampling: Non-disruptive Subsea Intervention … · 2018-02-12 · 2 Presentation...
Transcript of In-line Subsea Sampling: Non-disruptive Subsea Intervention … · 2018-02-12 · 2 Presentation...
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In-line Subsea Sampling: Non-disruptive Subsea Intervention Technology for Production Assurance
Hua Guan, Principal Engineer, OneSubsea
Phillip Rice, Sales&Commercial Manager, OneSubsea
February 8, Subsea Expo 2018, Aberdeen
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Presentation Outline
• Production assurance challenges along the fluid journey
• Fluid PVT and importance of representative samples
• Subsea sampling system
• Subsea sampling demo
• Project example – subsea sampling application for scale squeeze optimization
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Complexity and Multi-disciplines in Subsea Production
PVT
Sampling
Wellbore
Sim.
Production
chemicals
Fluid
Analysis &
Modelling
Steady
State MP
Flow Sim.
Riser & Flowline
Monitoring
Solids Prec.
& Depos.
Topside
Process
Sim.
Production
Operations
& Opt.
Forecasting,
Risks, and
Sensitivities
Processing
/ Boosting
The Fluid Journey
SS
Surveill.
Subsea
Archi-
tecture
Transient
MP
Flow Sim.
Interv.MP Flow
Metering
Inflow
Performance
Completion
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Production Assurance Challenges along the Fluid Journey
Deposition management
Liquid management
Pressure management
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Production Assurance Challenges along the Fluid Journey
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Fluid PVT and Importance of Representative Samples
Temperature
Pre
ssu
re
Hyd
rate
Curv
e
Facility
Reservoir P&T
Start
Reservoir P&T
Long-Term
Look-a-head
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Subsea Industry Trends
Increasing production assurance challenges + high intervention costs
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Drivers for Representative Sampling
Almost all technical and economic reservoir studies require an
accurate and reliable understanding of the reservoir fluids.
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Drivers for Representative Sampling
• At source verification of production fluids and characteristics
Reservoir Monitoring
• Flow assurance
• Efficient well intervention
• Optimisation of subsea processing
Production Enhancement
• Fiscal allocation
• Reservoir communication
Other
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Multiphase Representative Sampling
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OneSubsea Sampling System - Demo
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Key Functionality
Safety in design
▪ Well isolation and fail safe methodology
Accuracy
▪ Isobaric Sampling – High importance
▪ Isothermal Sampling – Medium importance
Phase Targeted Sampling
▪ Phase enrichment
▪ Optical phase detection
Sample Capacity
▪ No of sampling bottles and volumetric capacity
Flow assurance
▪ Module heating
▪ Subsea and Topside flushing procedures
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Subsea Sampling System
Subsea Sampling Hardware
▪ Sampling Interface–Based on blind T, flexible access /
retrievable
–Dual pressure barrier philosophy
▪ Sampling Module– Isothermal and isobaric sampling
–Phase detection and phase enrichment
–Winch deployed / ROV assisted skid
–Remotely controlled system
–Transportable sample receptacles
Subsea Sampling Services
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Anatomy of a Subsea Sampling Interface
Alignment and Connection
▪ Several flexible connection types.
▪ Fully qualified.
Blind T
▪ Flow conditioning via fluid dynamics.
▪ Dual takeoff for phase rich samples.
Dual Isolation Valves
▪ Hydraulic or manual control.
▪ Topside or ROV control.
Flexibility
▪ Horizontal or Vertical access.
▪ Manifold or Xmas Tree
▪ Permanent or Temporary installation
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Anatomy of a Subsea Sampling Module
Displacement Unit Pump
▪ Automatic reciprocation via hydraulic power supply
▪ Facilitates near Isobaric sampling
Separator
▪ Phase enrichment
▪ Optical phase detection
▪ Facilitates targeted phase sampling
Sample Bottles
▪ Facilitates multiple discrete samples
▪ Sealed subsea for safe transfer to topside facility
Heating Methods
▪ Flow assurance
▪ Facilitated near Isothermal samplingHeated Water Bath
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Subsea Sampling Case Study - Overview
2 off ROV FLOT carried subsea sampling modules
• Design pressure: 5000 psi and 930C
• Number of samples: 4
• Sample volume: 600cc
• Subsea Deployment System
• Capable of controlled fluid separation, during
sampling.
• Heating system for hydrate mitigation
4 off ROV operated X-mas tree installed subsea
sampling interfaces
• Design Pressure: 10.000 PSI and 1210C
• Subsea ROV interchangeable wearables for life of
field operation and servicing
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Subsea Sampling Case Study – Field Performance
First sample October 2016
12 samples taken from 3 individual wells
1 st sample performed in approx. 6 hours from
deployment to retrieval
Scale Squeeze Optimization
▪ Integrated modelling for accurate
prediction of interval between Scale
treatments
▪ Reduce intervention frequency
▪ OPEX saving and increased up-time
0.1
1
10
100
1000
10000
0 1000 2000 3000 4000 5000 6000
cummulative water production (x1000 bbls)
Inh
ibit
or
co
nc
en
tra
tio
n (
pp
m)
field return concentration (ppm)
new modelled return concentration (ppm)
previous modelled return concentration (ppm)
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Integrated Modeling to Diagnose and Optimize PA Problems
Schlumberger Tools Third Party
ScaleChem MultiScale
OLI Analyzer StudioProsper / GAP
PVT Analysis Scale Analysis
Corrosion Analysis Wells / Pipelines
Economic Analysis Process Simulation
HYSYS
Wells / Pipelines
Steady State
Wells / Pipelines
Dynamic
Reservoir Simulation Integrated Modeling
PVT Specialized Flow
Assurance
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Integrated Subsea Sampling In Summary
Sample extraction
Analysis and
reporting
Modelling, EoS,
Uncertainty, and
decisions
Optimisation
Sampling interface
Production
management
workflows