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E-155 - Wellsite Geology

  • Geologists, technicians involved with geological well-site control and/or supervision.
  • Geoscientists using well geological reports.
  • This course provides a comprehensive understanding of how to monitor and use geological data acquired while drilling in order to characterize geological formations and reservoirs.
Learning Objectives
  • Upon completion of the course, participants will be able to:
  • understand a well-site geologist’s role, tasks and responsibilities,
  • grasp various techniques applied in well-site geology and during coring operations,
  • learn about the various aspects of operations geology and geological logging.
  • No prerequisites for this course.
Ways and means
  • Interactive presentations, applications on case studies, team work.

Drilling parameters 0.5 day
  • Quick review of mechanical parameters (WOH, WOB, RPM, ROP) & hydraulic parameters (SPP, MFR, MPL, MWin & out, etc.) monitored during drilling.
Geological parameters 1 day
  • Cuttings: sampling, cleaning, analysis, description, calcimetry, lag time, XRD, fluorescence.
  • Quality and representativeness of cuttings.
  • Hints on how to fill in the cutting description sheet; Main minerals and accessory minerals.
  • Paleontological observations.
Hydrocarbon gases 1 day
  • Physics and chemistry of gases.
  • Detection & evaluation of gas shows while drilling - Chromatography - Type of dissolved gases in the mud.
  • Importance of gas control on quality of measurements - Gas while drilling.
Geological logging 1 day
  • Role of well site geologist: analysis and decision.
  • Depth control: depth, deviation surveys, (MD, TVD, TVDSS) and stratigraphic column.
  • Gathering geological and drilling information.
  • Geological log: header and track presentation; main software programs.
  • Drilling parameters for a geological log.
  • Calcimetry, gas, gain and losses.
  • Composite log: Interpretation of geological observations and descriptions for the lithology.
  • Integration of other data: well tests results and logging information.
  • Supervision and quality control of logging operations.
  • Coring operations: core recovery, cleaning, splicing, description, fracture identification, sampling, photos.
  • Final report.
  • Case studies.
Workshop session: case study 1.5 days
  • Quality control: quality control of mud logs in clastic and carbonate environments.
  • Hands-on: composite mud log construction from analyses and cuttings description.