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  • Case Study

Replacement of a 7 year Old Fluid Sampling System

+ about the project

In 2019, Qteq successfully deployed a hybrid fibre optic and electronic downhole monitoring system in four deviated wells within the Otway Basin, Victoria. By integrating FibreTraq and ResTraq technologies into a single opto-electronic architecture, Qteq enabled real-time distributed acoustic sensing (DAS), distributed temperature sensing (DTS), and permanent downhole pressure monitoring (PDHG).

The project marked a significant advancement in well surveillance, demonstrating rig-less deployment techniques and ensuring sensor resilience in a highly corrosive and abrasive environment.

+ summary facts
Location
Otway Basin, Victoria, Australia
Application
Fibre optic and electronic downhole sensors
Solutions
FibreTraq ResTraq
+ Challenges
  • Install fibre optic distributed acoustic sensing (DAS) and distributed temperature sensing (DAS) systems behind casing to below a deep saline formation.
  • Suspend additional DAS/DTS systems and electronic permanent downhole pressure gauges (PDHG) across the formation inside the same deviated wells.
  • Deploy the suspended fibre optic and electronic downhole sensors without the aid of a completion rig.
  • All suspended downhole sensor equipment needed to contend with high corrosion, erosion and abrasion potential and high tensile loads.
+ Objectives
  • Monitor injection conformance and migration of CO2 into the saline formation.
  • Verify containment of the CO2 plume within the disposal formation and ensure zero CO2 fugitive emissions past barriers in the injection wells.
  • Validate next-generation monitoring and verification (M&V) technology to track and image CO2 plumes.

By integrating fibre optic and electronic sensors into a single architecture, we achieved seamless data acquisition without the need for a completion rig—saving time, costs, and improving well integrity.

Senior Well Surveillance Engineer

+ results
  • Qteq integrated Insert FibreTraq and Insert ResTraq systems into a single opto-electronic architecture.
  • The hybrid system uses a single wireline toolstring to house the PDHG and fibre end termination sub.
  • The toolstring incorporates roller guides and weight stem to aid deployment in deviated well trajectories.
  • The toolstring is deployed on a steel support wire, with fibre optic and electrical cables clamped to the wire.
  • Four hybrid systems were successfully installed, using a novel rig-less deployment technique.
  • Casing-deployed DAS/DTS systems were also successfully installed in the same four wells.

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