DOBS: Drilling/Advancement Observations & Parameters

  • Class: Samples, Amalgamated Specimens and Laboratory Test Scheduling
Heading Unit Type Example Description
LOCA_ID   ID 327-16A Location identifier
DOBS_TOP m 2DP 6.2 Depth to top of reported section
DOBS_BASE m 2DP 7.2 Depth to base of reported section
DOBS_SET   X A Readings set reference
DOBS_DURN hh:mm:ss T 0:05:00 Duration to advance reported section
DOBS_STIM yyyy-mm-ddThh:mm:ss DT 2010-12-02T14:05:15 Date and time of start of reported section
DOBS_ETIM yyyy-mm-ddThh:mm:ss DT 2010-12-02T14:10:15 Date and time at end of reported section
DOBS_DHRT Nm 1DP 250.5 Drill head rotational torque
DOBS_DHRS rpm 0DP 76 Drill head rotational speed
DOBS_PENR m/hr 1DP 2 Penetration rate
DOBS_HAMM   YN N Hammering used during section
DOBS_THRP bar 1DP 30 Pressure of downthrust system
DOBS_RESP bar 1DP 25 Pressure of restraining (holdback) system
DOBS_TORP bar 1DP 20 Torque pressure
DOBS_TORQ Nm 1DP 250 Torque applied to top of drill rods
DOBS_THST kN 1DP 5 Downward thrust on bit
DOBS_REST kN 1DP 5 Restraining (holdback) force
DOBS_HAMP bar 1DP 80 Supply pressure to downhole hammer
DOBS_SPEN MJ/m3 1DP 500 Specific energy
DOBS_FMPO kPa 1DP 15.3 Flushing medium pressure at the output of the pump over flush zone
DOBS_FMCR l/min 1DP 1.2 Flushing medium circulation rate (input) over flush zone
DOBS_FMRR l/min 1DP 1.1 Flushing medium recovery rate over flush zone
DOBS_REM   X   Remarks
FILE_FSET   X FS36 Associated file reference (eg drilling journals or log files)

Notes - 5

  • DOBS is to be used to record information on hole advancement and drilling parameters, for example open hole rotary drilling information.
  • DOBS records are data relating to the drilling parameters over a depth range. Where instrumentation on drilling rigs provides point readings of these parameters, this data should either be collated to summarise parameters over appropriate depth ranges, or reported with the start and end of each depth range to represent a point reading.
  • DOBS_SET allows for multiple readings to be included in the group in circumstances for example where a hole depth section is re-drilled.
  • FLSH should be used to record other flushing related information.
  • It is suggested that DOBS can be used to transfer information recorded from instrumented drilling rigs. Additional fields maybe required to fully transfer the information.