- Compact, disposable optical pressure-temperature gauge enhances low cost FiberLine Intervention surveillance system -
Downhole sensing technology specialist, Well-SENSE, has
today (Tuesday, 7th May) launched a miniature optical pressure-temperature gauge,
as part of its FiberLine Intervention (FLI) system, at the Offshore Technology
Conference (OTC) in Houston.
The Well-SENSE optical gauge widens the well surveillance
application envelope for FLI, both on and offshore, and offers operators a
low-cost and disposable alternative to both permanent downhole sensors and more
traditional electronic logging devices.
Combined with FLI’s other features and benefits, including
a simple deployment mechanism and distributed sensing, it can deliver savings
in the region of 50-90% compared to conventional logging methods.
The fiber Bragg grating based device is a robust optical
gauge with no electronics, batteries, external connections or power supply
required. It is integrated into the fiber line and is ideally suited to well
surveillance activities in harsh environments around the world, including HPHT
applications. Set as standard, the new gauge has the capability to measure up
to 10,000psi and 150°C, with the option to enhance this further to 20,000psi
The Aberdeen-headquartered company has developed its own exclusive
technology in partnership with optical sensor company Fibos in Toronto, Canada.
Believed to be one of the most compact Bragg grating based gauges on the
market, at around only 10mm³, it can be combined with other sensors and incorporated
inside Well-SENSE’s smallest FLI probe. This means that it can be deployed in narrow
access wells to log data during descent and capture bottom hole temperature and
pressure over time. It is long-lasting and can be left in the well with the FLI
system for days, or even months, and will stream real-time, live well data
along the optical fiber back to surface.
Well-SENSE CEO Craig Feherty, said: “Typically, optical
sensors have been combined into complex well surveillance systems which are costly
and deliver sophisticated levels of capability. Systems run in wireline require
either batteries or electrical power and also need specialist equipment to be
deployed, which inflates operational costs.
“To counter this for our clients, we have developed a
miniaturised optical pressure-temperature gauge, utilising advanced Bragg
grating technology, which will combine seamlessly with our simple, low cost, disposable
FLI system. The technology is sophisticated and sensitive to suit high value
production logging operations, whilst the flexibility and simplicity of the FLI
system allows it to access places in the well that wireline sensors physically
can’t at a much lower cost.
“The introduction of this pressure and temperature sensor
as part of our technology roadmap is an exciting addition to our FiberLine
solution. We have further optical developments in the pipeline to expand the
range for our customers – so watch this space.”
Fiber Bragg gratings have been used in oil and gas production monitoring since the 1990s and can be used
for a wide range of applications including flow monitoring, production profiling
and leak detection.
A fiber Bragg
grating is a short segment of optical fiber with inscribed gratings, set
precise distances apart, that reflect particular wavelengths of light and
transmit others. By monitoring the expansion and contraction of these gratings,
measurements of pressure and temperature can be obtained.