FiberLine Intervention Jan22

Fast fibre-optic intervention, surveys and diagnostics.

WHAT IS FLI?
WHY SHOULD YOU USE IT?

Rapid deployment well-bore surveillance
Bare fibre optic system provides best-inclass sensitivity
Exceedingly small footprint and low complexity
Fixed fibre deployment provides pinpoint depth control
Rich data sets provide valuable information on fluid and well dynamics

Well surveillance and diagnostics at the speed of light

RIG UP

MINIMAL FOOTPRINT – LOAD OUT FOR A MULTI-WELL OFFSHORE CAMPAIGN

DISTRIBUTED TEMPERATURE SENSING

DTS measures the temperature at 1m intervals along the length of the fibre. Fluid movement in the wellbore cause changes in the temperature.

Wellbore fluid movement
High volume annular fluid movement
Exothermic reactions
Geothermal temperature changes

DISTRIBUTED ACOUSTIC SENSING

A single distributed acoustic sensing (DAS) measurement can convey different information in different frequency bands. High frequency acoustics may only be detected a few cms from a sound source, but low frequencies may travel for many metres. We use this to determine the point of origin.

Low frequencies: 0-20hz (0-4hz = Strain Events)

– Thermal disturbances
– Fluid interfaces
– Seismic (and micro-seismic)

Medium frequencies: 2—100hz

– Flow past obstacles
– Behind tubing flow

High Frequencies >100hz

– Gas leaks
– GLV flow
– Tubing leaks

POINT PRESSURE MEASUREMENT

A pressure transducer can be deployed within the FLI probe and the bottom hole pressure measurement transmitted
back to surface using the fibre optic line. Surface read out is provided using a simple receiver and laptop.

Applications

- Production optimization
- Reserves evaluation
- Enhanced recovery planning
- P&A planning
- Improved leak detection

DEPLOYMENT AND DEPTH CONTROL Run In Hole Capture DAS and DTS

Fibre depth fixed at surface
Fibre extension and rotation negligible
Fibre interrogator or QC lasers used to determine depth to within 1m.

APPLICATIONS FOR FLI

Bottom hole pressure measurements
Fluid interface detection
Leak detection / barrier verification
Cement cure evaluation
Injection profiling
Gas inflow profiling*
Vertical seismic profiles
Offset well frac monitoring

TRACK RECORD

PROJECT: UK NORTH SEA THROUGH-TUBING LEAK DETECTION

Status: During cut and lubricate operations well integrity issues were noted with pressure build up in the tubing and A-annulus
Objective: Locate well integrity issue so barriers can be regained for Xmas tree removal
FLI was deployed in 4-1/2” tubing to a depth of 8,850ft
B-annulus valve was opened to bleed down pressure and activate the leak
An acoustic event was immediately recorded, originating at 7,960ft
The flow is observed to move upwards from this point to the 7-5/8” liner top, and downwards to a depth of 8,200ft which correlates to the top of a milled window in the 9-5/8” casing

PROJECT: UK NORTH SEA OFFLINE BARRIER ASSESSMENT

Objective: Locate source of A-annulus (wellbore) gas to enable remedial operations
FLI was rigged up through the skid deck hatch and the probe landed out on the internal cement plug
Outcome: Clear indications were observed of flow from below the probe with all other depths indicating static fluids.

Sequence of events – Leak detection

21:35 – Launch FLI tool
21:55 – FLI landed out on cement plug @ 5000ft
22:45 – Bleed down well pressure
00:07 – Shut-in well
01:02 – Bleed down well pressure
01:17 – Extended monitoring period
04:00 – Stop logging and close in well

PROJECT: MALAYSIA SARAWAK MULTI-WELL LEAK DETECTION

Campaign to monitor leak points in multiple wells.

One engineer offshore to log 3 wells over 3 shifts
Program to stimulate leaks in each well by bleeding off annulus pressure and monitoring the pressure charge back
Real-time remote operations monitoring
Successfully logged both DAS and DTS to identify leak points in all wells with leaks in A, B and C Annulus

PROJECT: PERSIAN GULF MULTI-WELL INTERFERENCE SURVEY

FLI was deployed in 5 wells

– Injectors and producers
– One single and two dual deployments
– Survey times were 24 hours each
– Operations were completed in 100hrs – rig-up to rig down.

A combination of DTS and DAS was used to detect fluid movement up to 4 layers of pipe and 2 layers of cement beyond the fibre.

WHAT IS FLI?
WHY SHOULD YOU USE IT?

Fibre-optic well surveillance and diagnostics
Single-use probe is in-well disposable
Simple rapid intervention system
High quality distributed temperature & acoustic data
Deploys bare fibre to total depth
Highly sensitive, real-time monitoring
Less equipment & fewer personnel = smaller wellsite footprint
Reduced carbon footprint
Lightweight, compact & portable
Low cost & risk

FLI is fast
FLI has a tiny footprint
FLI is powerful

Well surveillance and diagnostics at the speed of light