Distributed Temperature Sensing, the Motor for Tunnel Innovation and Safety in Croatia

Tunnels are sensitive traffic bottlenecks and consequently extraordinary vulnerable in case of accidents or fire blasts. Danger for life and enormous economic consequences ask also for technical solutions of prevention and limitation of damage.

LIOS Technology and its Croatian partner Tehnomobil have set a new standard for modern fire safety solutions for the road tunnel network in Croatia.

Croatia is located in South-Central Europe and shows diverse terrain, including: rolling hills in the continental north and northeast, densely wooded mountains and rocky coastlines on the Adriatic Sea. The highlight of Croatia's recent infrastructure developments is its rapidly growing highway network which puts focus on tunnels as well.

Tehnomobil’s excellent engineering and contracting background in traffic infrastructure and fire fighting industries perfectly match with LIOS Technology’s comprehensive experience in fire detection applications for tunnels and special hazard buildings with an impressive track record of more than 2000 installed fibre optic temperature sensing systems worldwide.

Best fire surveillance for more than 90 % of the road tunnels in Croatia

At present an impressive share of more than 90 % of the Croatian road tunnels are equipped with the fibre optic fire detection system by LIOS Technology. In 28 tunnels with in total 55 tunnel tubes the purely passive LIOS fibre optic line sensor cable has been installed by Tehnomobil for reliable and fast fire detection. Those tunnels with tube lengths ranging from 500m to almost 6000m were newly opened in recent years or re-opened after full refurbishments where the conventional line type fire detection system could be replaced by the fibre optic LIOS system. Within LIOS Technology’s long list of tunnel projects in Croatia it is worth to stress the tunnels Veliki Glozac and Brinje which received best scores at recent European tunnel safety rankings.

Read more:

• Optimum Safety in Tunnels and Special Hazard Buildings
• Distributed Temperature Sensing

Intelligent Well Completion - Special Focus on "World Oil" magazine

Right from the oil industry’s begin­ning, people wanted to know more about the reservoirs that they were exploiting. This included having a more sound un­derstanding about reservoir behaviour and obtaining knowledge on how to optimize hydrocarbon recovery. As it was, and still is, impossible to look directly into a res­ervoir, other ways to obtain information about it needed to be investigated. Direct surface measurements were helpful and are still required today, but downhole sensing quickly became an important topic for reservoir monitoring.

The first sensors were for pressure measurements and then temperature. Nowadays, micro-sensing images a whole ground section in 3D. A lot of in­formation can be derived from relatively easy temperature measurements along the borehole. The advances in fibre op­tics and packaging, and the experience gained over the last five to 10 years, has enabled the industry to deliver low-cost DTS systems. An additional factor has been further development of industry standards and electronics, enabling per­sonnel to build an architecture that al­lows data flow from the well to the pro­duction technologist’s desk.


Reprinted from: World Oil,  May 2007 issue, pgs 37–44.


Read more:

	Download complete "World Oil" article on permanent downhole temperature sensing
	Oil and gas well optimisation and reservoir performance improvement

Success story for permanent downhole sensing - Maximize your ROI with DTS

Technology is the key driver in the quest for greater efficiency. In the oil and gas industry, there is keen interest and high demand for low-cost, reliable, and easily installable systems to enhance downhole production and recovery.

“Installation of LIOS DTS in the Darat Field in Brunei has proven to increase the value of the wells from our customer significantly because of early detection of faulty gas lift valves, resulting in quick repair and increased production.”

Lt Col (B) Mahmod Yakop (Founder & Managing Director, AMRTUR Corporation Sdn. Bhd)

In a co-operation between Shell International Exploration and Production (SIEP) and LIOS Technology GmbH (LIOS) the feasibility and economical added value of permanent downhole temperature sensing have been successfully demonstrated in a number of recently deployed on- and offshore projects in Brunei BSP. This shows that once certain maturity and robustness in a technology has evolved and an agreement on standards has been implemented low-cost equipment can be designed, manufactured, and deployed even for low-cost wells. The applied design and working practices enable permanent in-well sensing for a large-scale role out. Additionally, a common database has been developed and successfully deployed. The reservoir engineers in BSP have now full access to the low-cost DTS installed wells around the clock, every day of the year.