Thursday, 28 January 2016

What is a neutron probe and what do we use them for?

A neutron probe provides calibrated borehole-compensated neutron porosity measurements designed for mud filled holes. The neutron probe is the probe of choice when it comes to quantitative formation fluid studies. Under the majority of borehole conditions, a single-detector neutron probe is also available for qualitative porosity logging.  This includes through steel or plastic casing and drill pipes.

Probes such as neutron probe are used to identify faults and folding, along with locating issues and characteristics within certain fractures that allow the proceeding to complete further investigation. These imaging probes allow each electrode to emit its own current that is focussed into a narrow beam and returned to a remote part of the tool body. This current is the digitalised in each pad, before being transmitted to the surface by a separate telemetry module. This makes use of propriety high speed communication systems and may be run through 4 or 7 core cables, making it compatible with standard oilfield systems, running Warrior software.

 Micro-resistivity, borehole diameter, drift and inclination are among some of the measurements that can be registered during the operation of this new tool. There are a number of different probes on the market, suited to different activities. The neutron probe will operate in a water filled open or cased borehole, whereas the slim micro-resistivity image probe works in water based mud.

These probes have been developed thanks to the growth within the industry, allowing technological advancement to influence the introduction and use of probes.  Wireline logging is also experiencing growth and development and expects to have made rapid increases by 2020. The increase in exploration, production activities and expenditure by oil and gas companies has allowed the industry to grow.

Image by 'magnera' / Licence

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