Transcript Presentation

Mike Webster Intelligent Wells Project UTG Aberdeen
FORCE Seminar Stavanger Norway 28th-29th March, 2001
Fiber Optic Sensors
Development and Challenges
Mike Webster Intelligent Wells Project UTG Aberdeen
FORCE Seminar Stavanger Norway 28th-29th March, 2001
Why should we be interested in optical sensors ?
Intelligent Wells Project mission: Develop technologies for deepwater
developments that provide reliable reservoir surveillance information and allow
control of zonal contribution without intervening into the wells.
Goal: Achieve a 90% system survivability over 5 years.
Current electrical system performance falls short of assets goals.
Current Electronic Flowmeter and Gauge Track Record
1.0
0.9
0.8
Surviving
0.7
Flow meter
P/T Gauge
0.6
0.5
0.4
0.3
0.2
0.1
0.0
0
200
400
600
Actual survival days
800
1000
Drivers for Fiber Optic systems
• Potential for Increased reliability of the downhole sensors
•Subsurface is passive
•Surface optoelectronics can be maintained and upgraded
• Ability to install a large number of varied sensor types
• Ability to survive in harsh environments (particularly temperature)
• Distributed sensing removes the need to select point of measurement
• Choice of fixed installation or renewable hydraulic deployments
• Leverage off large telecoms R&D spend
Fiber Optic Sensing Implementations
Point Sensor
Single Sensor
location
Quasi-Distributed
Sensor
Multiple Sensor
locations
Distributed
Sensor
Continuous Sensor
Point Sensor Fiber Optic Monitoring Systems
Flow/Phase Fraction
Pressure/Temperature
Seismic
Optical Pressure Gauge Gaps and Trials
Technology Development and Field Trials
• Optoplan gauges deployed in Gyda (Aug 94)
• First Cidra Bragg grating installed in Pompano April 2000
• Large number of installations planned in 2001 including Valhall
Technology Gaps
• Optical wet connector enhancements
• Subsea integration and deployment of optical systems
Distributed Temperature Current Claims
Double ended
Single ended
Tubing
Control line
& fibre
Perforations
Check valve
+/-0.5 deg C resolution at 2m
up to 30 km
Turnaround sub
+/-0.1 deg C resolution at 1m
up to 12 km
Current/Future DTS Installations
Current DTS Installations
Wytch Farm K-07
Wytch Farm M-12
Wytch Farm M-17
Marlin A-06
Marlin A-04
April 97
May 98
Sept 99
Dec 00
Feb 01
ESP Pump monitoring
Commingled Producer/Injector
Producer
VIT surveillance
VIT surveillance
May 01
Sept 01
Aug 01
4 wells gas inflow monitroring
Sand face monitoring
ESP Producers
Future Installations
Trinidad Mahogany
Chirag
Wytch Farm
How can we validate DTS data ?
Numerical Model
DTS Thermal Profile
PLT Thermal Profile
Thermal Modelling of PLT Data
Magnus M10-A3 Well
Temperature Profile
115.0
114.5
PLT Temp. (main flow)
Wellcat Temp. (main flow)
Perfs
5,100 bfpd (2,800 water)
1,600 bopd
114.0
14,300 bopd
Temperature (deg C)
113.5
113.0
112.5
112.0
111.5
111.0
110.5
zone G
110.0
3590
3600
3610
3620
3630
3640
zone E
3650
3660
Depth, mdBRT (m)
3670
3680
zone C
3690
3700
3710
3720
Field example: Wytch Farm M-17 watercut increase
62
0.7
60
Pore Volume
T emperature (Deg C)
61
59
58
15/01/00
14/02/00
57
Po r o s ity
Po r o s ity*Sw
56
Pe r fo r at io n s
55
54
53
52
4000
0
4050
4100
4150
4200
Depth (m)
4250
4300
4350
Field example: Wytch Farm M-17 thermal profile
Jul 00
68.0-69.0
Jun 00
67.0-68.0
66.0-67.0
65.0-66.0
May 00
64.0-65.0
63.0-64.0
Apr 00
62.0-63.0
61.0-62.0
60.0-61.0
Mar 00
59.0-60.0
58.0-59.0
Feb 00
57.0-58.0
56.0-57.0
Jan 00
55.0-56.0
54.0-55.0
53.0-54.0
Dec 99
52.0-53.0
51.0-52.0
Nov 99
50.0-51.0
Oct 99
2,708 2,870 3,031 3,192 3,353 3,515 3,676 3,837 3,999 4,160
Measured Depth (m)
Where do we want to go with DTS ?
• Increased deployment of DTS in a variety of environments
•Single ended vs Double
•Pump down vs hard wire
• Bench test all current DTS optoelectronics systems
• Deploy DTS fiber with optical point measurement devices
• Encourage the inclusion of DTS fiber in downhole electrical cable
• Enhance current DTS performance to achieve the following spec
•Thermal Resolution <0.1 deg C
•Spatial resolution <3m
•Distance from light source 20km
•Sample time <24hrs
BP Intelligent Wells Optical Objectives 2001
Comprehensive Reliability assessment of fiber optic systems
Increased utilization of optical pressure gauges company wide
Development of downhole and tubing hanger optical wet connects
Extended range DTS system
Seabed optical architecture and integration
Integration of fiber into well components associated with deep water completions
Integration of fiber onto sand screens / expandable screens
The Vision
Continuous Surveillance
+
Intelligent Wells
=
continuous
pressure and
saturation
monitoring
Mike Webster Intelligent Wells Project UTG Aberdeen
FORCE Seminar Stavanger Norway 28th-29th March, 2001