Modify measurement

The total trajectory of a borehole is measured as a combination of two separate measuring methods:

  1. Inclination angle measured by the triaxis accelerometer is an absolute point-specific value at each rod uncoupling point when timestamps are taken.
  2. Azimuth angle measured by the gyroscopes as a change between two measurement points, i.e. rod uncoupling points where timestamps are recorded.

The measurement accuracy can be adversely affected by high energy occurrences that are sometimes necessary during the lifting of rods in standard procedures, namely high-speed rotation and loose hammering.

The modify measurement feature can be used in order to increase Azimuth angle accuracy during measurement. Use this feature to avoid measuring mistakes caused by percussion or high drill bit rotation speed.

  1. Lift the rods to where they would normally be uncoupled and take the coupling between the clamps.
  2. Record a measuring point by pressing the Detach a rod button.
    A timestamp is created.
  3. Use percussion to loosen the threads, uncouple the rod and place it in the rod magazine. Bring down the shank and couple the next rod.
    Note: Before using the Modify measurement feature, try to clamp the coupling at the exact same point where you recorded a timestamp in Step 2. This improves the measurement accuracy.
  4. Press More... to access measurement options.
    1. Press Cancel measurement to cancel the entire borehole measurement.
    2. Press Modify measurement to modify current measurement.
    3. Press Pause here to pause the measurement process.
    4. Press Back to return to the measurement view.
  5. Press Modify measurement to modify current measurement.

    The blinking arrow on the left of the screen indicates where the system expects you to record the next timestamp. It is one step ahead of the current position as rods have not yet been lifted.

    1. Press Down once to bring the system to the correct depth. The arrow indicating the current measuring point moves down one step.
      Note: Do not shake the rods!
    2. Press Confirm to continue borehole measurement or Cancel to cancel modifications.
  6. Record a new timestamp by pressing the Detach a rod button.
  7. Continue the rod lifting process normally.
Parent topic: Measuring view