The DeviGyro is not a North-seeking Gyro in the true sense of the word. It is a high precision continuous rate gyro using North-seeking principles and proprietary algorithms to determine the drill hole path from a known direction.
Most continuous North-seeking gyros operate in the same way. They determine a start direction and then measure the “rate“ of change from the initial reference.
Downhole Surveys recommends combining the DeviGyro with an Azimuth Aligner in order to get a powerful North-seeking system that is superior to existing North-seeking borehole tools. Enquire about our reduced package pricing today.
25mm x 110mm. It can fit in your pocket it’s that small!
The DeviGyro can survey all angles.
Downhole Surveys are currently only releasing to the Surface RC and Diamond markets, with releases catering to underground up-hole applications coming soon.
The DeviGyro’s maximum operating speed is 180m/min, however Downhole Surveys recommends the DeviGyro be operated at a safe running speed of 60 – 80m/min.
Yes a zero velocity update is required every 10 minutes for a period of 15 seconds. The DeviGyro App prompts the user for the stops.
There is no gyro warm up time required. However, best practice is to allow the DeviGyro time to temperature stabilise to the environment it is working in.
Yes a tie on survey can be conducted, however best practice is to conduct a new survey each time from the collar and apply weighted averaging to increase the survey precision.
The DeviGyro sensor is housed in a 40mm OD small brass barrel. Aluminium spacer rods are added to lengthen the assembly and a set of centralisers provide rotation at a controlled rate. A shock sub is added to the bottom section for protection and a range of top sub adaptors are available. Most common is a spearhead or wireline swivel.
All components are supplied in a single rifle case weighing approximately 25 kg.
A critical component supplied with the continuous DeviGyro is the optical depth encoder, the DeviCounter. The Devicounter is attached to the drill rig wireline, recording time and depth, whilst the DeviGyro records time and navigation data. After surveying is completed the two sets of data are merged.
Unlike some counter systems the DeviCounter stores the depth data internally, correcting errors prior to merging.
The DeviGyro can also be run in manual mode where a depth interval is manually entered, for example when using a fibre glass rodder or polypipe.
0.2% of hole depth