Sensornet develops fiber-optic distributed temperature cable range
Offshore staff
ABERDEEN, UK -- Sensornet has developed a new high performance SureSight fiber-optic distributed temperature cable range that can withstand extreme heat and operate in the harshest downhole environments, according to the company.
Used for high temperature wellbore monitoring, the SureSight cables withstand temperatures up to 300º C (572º F), which are often experienced in steam assisted gravity drainage (SAGD) and cyclic steam injection (CSS) wells in steamflood reservoirs. By providing real-time permanent monitoring for enhanced recovery and proactive management, the technology marks a step change in performance from traditional technologies.
As an increasing number of wells are developed in hostile conditions, SureSight cables have been designed and optimized with double ended measurement capabilities. This is particularly important in hydrogen rich, high temperature installations as single-ended measurements become susceptible to changes in temperature caused by hydrogen ingress. This can present significant problems for operators as incorrect temperature readings can be produced.
The unique cable construction provides a number of benefits over the use of standard fiber optic technology, according to Sensornet. While multiple layers provide a pressure barrier to prevent damaging hydrogen ingress, the latest generation of optical fibers minimize the effects of hydrogen darkening with chemical composition and coatings. The rugged cable design means the integrity of the DTS system can be monitored during installation and information sourced on stimulant/frac fluid placement, the company says.
08/18/2008
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