Sensa Fiber Optics Distributed Temperature Monitoring for ...
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1 ASME/API/ISO Feb 6-7, 2007 Gas Lift Workshop- Doha Schlumberger Public Sensa Fiber Optics Distributed Temperature Monitoring for Gas Lift Optimization Timo Staal February 6, 2007
Transcript of Sensa Fiber Optics Distributed Temperature Monitoring for ...
1 ASME/API/ISO Feb 6-7, 2007 Gas Lift Workshop- Doha
Schlumberger Public
Sensa Fiber Optics
Distributed TemperatureMonitoring for Gas Lift Optimization
Timo Staal February 6, 2007
2 ASME/API/ISO Feb 6-7, 2007 Gas Lift Workshop- Doha
Schlumberger Public
Is Your Gas Lift System Performing as Designed?
Gas Lift System efficiency
Operating costs
Non-productive time
Conformance
Real-time picture of all GLVs
Problem detection & immediate
rectification
GLS continuous performance
optimization
Problems Sensa DTS Solutions
Gas Lift Systems OptimizationGas Lift Systems Optimization
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Agenda
What will you get from using a Sensa DTS
system?
How does it work?
How do you run it: Permanent or Intervention?
Case studies
Review & Questions
4 ASME/API/ISO Feb 6-7, 2007 Gas Lift Workshop- Doha
Schlumberger Public
Sensa DTS: What do you get?Distributed Temperature profile
5 ASME/API/ISO Feb 6-7, 2007 Gas Lift Workshop- Doha
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w1: Valve identified
open
w2: Valve identified
open
Valve search
intervals
DTS temperature curve
GLOW: DTS Analysis softwareGas Lift Optimization and Leak detection at Wellsite
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Schlumberger Public
GLOW: Gas Lift Optimization and Leak detection at Wellsite
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Incident Laser Light
Backscattered Light
Laser Source
ReceiverReceiver
Directional CouplerDirectional Coupler
Fiber Optics CableFiber Optics Cable
Backscattered LightBackscattered Light(for every meter of the fibre optics)(for every meter of the fibre optics)
DTS System
Incident LightIncident Light
Rayleigh BandRayleigh BandBrillouinBrillouin LinesLines
WavelengthWavelength
AntiAnti--Stokes Stokes Raman BandRaman Band
StokesStokesRaman BandRaman Band
∆∆TT
Not Temperature Not Temperature sensitivesensitive
Temperature Temperature sensitivesensitive
The Distributed Temperature Sensing Measurement
8 ASME/API/ISO Feb 6-7, 2007 Gas Lift Workshop- Doha
Schlumberger Public
Agenda
What will you get from using a Sensa DTS
system?
How does it work?
How do you run it: Permanent or Intervention?
Case studies
Review & Questions
9 ASME/API/ISO Feb 6-7, 2007 Gas Lift Workshop- Doha
Schlumberger Public
Provides a system to optimize gas lift and assist with flow assuranceSystem has no negative impact to existing completion design
No modifications to existing equipmentNo additional control linesNo pre or post job well intervention
Maintains existing reliability of permanent downhole gauge
Permanent installation: WellWatcher NEONCombines fiber optic with downhole gauge cable
10 ASME/API/ISO Feb 6-7, 2007 Gas Lift Workshop- Doha
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WW Neon Components
NEON Hybrid Cable:Multiple H2 barriers customized for application10 or 15Kpsi versionsSM and / or MM fibers Min. incremental cable cost
Hybrid Wellhead outlet:Tested to API 6AHazardous Area Cert: EEXd II C<0.5 dB attenuation
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Intervention using SensaLine (FO SlickLine)
Memory or
RealtimeFO
Pressure gauge
Slickline equipment Standard Pressure Control Equipment
OD: 1/8’’ slicklineSensaLine: 0.125”Gas Lift Mandrels
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ahd (m)
T (C)
t 1 = 14:16 h - kick-off started
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ahd (m)
T (C)
t 2 = 17:16 h - top GLV open
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t 3 = 18:01 h - 2nd+ 3rd GLV pass gas
T (C)
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t 5 = 21:46 h - GLVs re-open at higher gas rateahd (m)
T (C)
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t 6 = 23:21 h – 3rd GLV lifting….continuous?ahd (m)
T (C)
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Activity at GL #3
Gas Lift Monitoring with DTS
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GLV’s
Temperature [Deg F]
Dep
th [f
t]
Operating GLV
Gas Lift Monitoring with DTS
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Gas Lift Monitoring with DTS – slugging valve
Geothermal Stable Flow
Joule Thomson cooling through
GLV
GLV
Unstable Flow
Geothermal
Joule Thomson cooling through
GLV
GLV
Unstable Flow
20 ASME/API/ISO Feb 6-7, 2007 Gas Lift Workshop- Doha
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Geothermal
Joule Thomson Cooling
Stable Flow
Reservoir
Gas Lift
Valves
Joule Thomson Cooling
Gas Lift Monitoring – well start-up
21 ASME/API/ISO Feb 6-7, 2007 Gas Lift Workshop- Doha
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Stable Flow
Gas Lift
Valves
Slug Flow
Gas front moving down the annulus
Lowest Valve operating
Gas Lift Monitoring – well start-up
22 ASME/API/ISO Feb 6-7, 2007 Gas Lift Workshop- Doha
Schlumberger Public
Case Study 3GL System with over-injection of gas
10 GLVs
Events happened at only 3 GLVs
GLS not functioning as designed
900k m3 gas over-injection
No completion integrity issues detected
Valve 5
Valve 4
Valve 3
Valve 5
Valve 4
Valve 3
23 ASME/API/ISO Feb 6-7, 2007 Gas Lift Workshop- Doha
Schlumberger Public
WellWatcher Neon –DTS- Applications
Ability to identify Gas Lift Valve Operation Real Time!Identify cycling valvesIdentify tubing integrity issuesIdentify Hydrate FormationMonitor Reservoir + GLV’sMonitor mudline to riser temperature transferMonitor vacuum insulated tubing
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Schlumberger Public
Review / Questions
Sensa Fiber Optic Distributed Temperature Monitoring for Gas Lift systems
Optimization
• Gas Lift System functionality
• Completion integrity
• Zonal flow contribution
