Technology

Our technology

Our technology and analyses make decision-making faster and safer

The technology and experience we offer is developed through many years of research and operation of wells and reservoirs within oil and gas. Many million NOK has been invested over many decades. Monviro aims to apply this technology and knowledge within new business areas such as environment, safety and sustainability.

We provdide flexible multi-physical monitoring services, optimally tailored to every specific project. Our services cover all the steps required to convert physical data into value for our clients. This includes feasibility studies defining overall monitoring needs, planning and execution of data acquisition, and providing support to integrate the acquired data into the client’s workflows.

Our main technologies are real-time seismic monitoring onshore and offshore, high accuracy 4D gravity monitoring, and seafloor deformation monitoring

Seismic monitoring system

– highly reliable passive and active monitoring of any (sub)surface based on a flexible and open architecture.

Seismic monitoring system is scalable and can be retrieved after dedicated operations or left on the seafloor for the lifetime of the project. It is easily integrated with other subsea infrastructure, as architecture is based on industry standards.
The sensor node of the REM seismic monitoring system includes a hydrophone and a 3-axis MEMS accelerometer, providing extended bandwidth and superior vector-fidelity. The data output is processed with Guardian, our in-house real-time processing software. Guardian ensures fast response time between data acquisition and implementation of decisions

Flexibility

Guardian and our Seismic Monitoring System interface with proven REM data acquisition system or any off the shelf seismic node and cable-based systems.

Data acquisition can be controlled from fixed or floating platforms, source vessels, buoys or onshore control centers by means of radio, satellite or optical fiber communication.

GRAVIMETRY AND SEAFLOOR DEFORMATION SURVEYS

»world-best accuracies in gravity changes and vertical seafloor deformation monitoring.»

MonViro’s surveys for measuring 4D gravity and vertical seafloor deformation make use of patented methods and technologies.

MonViro’s technology is the only one in the market providing field-wide seafloor subsidence monitoring with sub-centimeter accuracy.

The accuracy in 4D gravity is below one µGal. This represents a billionth of the normal gravity field on the Earth surface, or more importantly, sub-meter sensitivity to the displacement of fluid interfaces in the subsurface.

Monviro’ssurvey method

Gravity and seafloor deformation data are acquired simultaneously in combined surveys. A sensor frame containing three relative gravimeters and three pressure sensors is used for the measurements. To obtain the measured accuracies in 4D gravity correction for vertical seafloor deformation is key.

Seafloor deformation data can also be acquired alone in dedicated surveys. The principal measurement is then pressure and these surveys are available with a more compact instrumentation and at reduced operational cost.

The gravity and pressure data are collected at stations distributed at the seafloor both above and surrounding the survey region of interest. The latter ones are used to provide in-situ calibration and a means to directly measuring the accuracy of the measurements. The stations are defined by semi-permanent concrete platforms that are placed at the seafloor. The role of the platforms is to guarantee time-lapse repeatability on the locations of the measurements.

During a survey, a vessel is positioned sequentially above the stations, and a remotely operated vehicle deploys the sensor frame to perform the measurements on top of each of them. The duration of a survey is typically a few weeks depending on the size of the survey region.

Tide gauges are deployed during the whole survey to correct raw pressure and gravity measurements for tides and other oceanographic effects.

Monviro’s instrumentation

OCTIO Environmental uses the best gravimeters, pressure sensors and tide gauges in the market. That is made possible by collaboration with respectively Scintrex, Paroscientific and Aanderaa.

MonViro’s integrated instrumentation features all the elements required for a cost-efficient, high data quality application:

• Automatization of the operation of the gravimeter
• Stabilization of sensor environment
• Real-time quality control of acquired data
• Continuous R&D to provide cost reductions and to meet particular project requirements