Direct Systems Australia produce survey and drilling data which enables them to plan workable designs using ground trends and barrel configurations to reach target with minimal navigational steering and motor work.   Each hole designed by Direct Systems Australia is checked by geologists in compatible software giving QC to borehole designing.

 

Boreholes are constantly monitored by DSA to ensure that the targets are still within an achievable realm. Plans are updated daily with the use of magnetic electronic Single Shots, and confirmed every 300m through the use of a North Seeking Gyroscope. DSA works closely with the supervising drill geologist, drilling supervisors, and the core yard staff to ensure designs remain practical and achievable.

 

Two forms of software are currently being utilised for the borehole design monitoring and control. This has been working quite well as a counter check for borehole data and picking up on inconsistencies. Through Drillog, the operators on site are readily able to run visual checks on designs and can provided both the client and drillers with a visual printed section of borehole deviation from the initial design, or what needs to be achieved through directional work to make the borehole more effective. It also assist’s the surveyors to extrapolate boreholes from which the client can be alerted if boreholes are going to trend close to existing work.


Further design checks and monitoring are also facilitated through liaising closely with the assigned drilling geologist and the use of software and sectional plots.


 BOREHOLE: POSITIONAL DESIGN, MONITORING AND CONTROL

Borehole Positional Accuracy and initial Design is established through the following process by Direct Systems Australia.

  • Intersection co-ordinates and dip are provided by the client
  •  A preliminary borehole is designed using the established surface elevation and lithological data from the present models.  Where possible an established borehole or drill pad will be used for the design.
  •  The proposed collar position is then checked through the use of a GPS. If necessary, the proposed collar will be moved to allow for minimal disturbance to the environment or the local population.
  •  Collar site is then established once environmental and community relations have checked on the proposed site.

  As the boreholes progress they are monitored through the following methods.

  •  Electronic Magnetic Single Shot (SS) data is filtered and cross checked against designs as the borehole progresses.
  •  Any deviations from the initial design are stabilised or corrected with barrel configurations initially, and through the use of a Casing Wedge where required
  • Gyroscopic survey is conducted in the first 300m to determine accurate positional data for the borehole. As the borehole progresses further gyroscopic control is used.  The frequency of its use is determined by the quality of the magnetic SS data being produced from the drilling contractors. Now with the option of running Magnetic surveys of our own onsite it has been much easier to produce quality magnetic data which has reduced the frequency of gyro required for the boreholes.