Basics of Logging
If you are looking to get information about your borehole or well, from formation characteristics to fluid properties, you will need to log it. Logging is the practice of lowering down a set of measurement probes into your well to measure the properties you need. To get the measurement probes in the hole, you will need an electrical logging cable and a winch. To supply power and to read the data from the probes, you will need a surface electronic unit, like the Geovista ‘logger’. All this information can then be processed using software on your PC.
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Downhole Logging Tools
Logging tools are also known as logging probes or logging sondes. They sense and provide data in the form of logs. This includes geophysical properties of the formations that have been crossed by the borehole and logs of the properties of the fluid therein.
Borehole inclination and trajectory sondes provide information about the trajectory of boreholes. Borehole trajectory inside casing or drill pipe can be logged using a sonde with a gyroscope.
Imaging sondes provide oriented acoustic or optical images of the borehole walls, allowing for the creation of virtual cores.
The downhole camera sonde records videos for the purpose of borehole inspections, problem diagnosis and problem solving.
The Down the hole geophone sonde is used to record at different depths, seismic energy wave trains originating from a source at the surface. This allows for the build up of a “vertical seismic profile” also simply known as VSP.
The micro-seismic sonde includes both the transmitter and the receivers and it allows for the recording of P & S sesimic energy wave trains inside the borehole., without the need for a mechanical coupling with the borehole wall.
