Geological Wellsite Supervision

Geological Wellsite Supervision is at the center of Chonook's services. The company was founded in 2002 with the purpose of providing professional wellsite geologists to the oil and gas industry.

Services provided by our wellsite geologists include:

  • Cuttings sample preparation, description, logging, interpretation
  • Directional drilling and MWD supervision
  • Mudlogging and gas detection supervision
  • Special geological operations supervision (DST, Coring, Wireline)
  • Client liaison and reporting
Petrographic analyses of drill cuttings
  • Preparation: wash, vial and label dry cuttings samples, index for ulterior analyses
  • Description: petrographic descriptions of samples: primary lithology, main constituents, grain size, cementation (type and degree), accessory minerals, porosity type, fluorescence and fluorescent cut description
      The interpretative side of cuttings analysis include:
    • Permeability estimation (Sneider/Archie classes)
    • Porosity estimation (porosity type, percent estimation)
    • Chromatography ratios interpretation (gas, oil, wet, condensate, residual, dry zones)
    • Wireline logs basic interpretation (identification of porous zones, tight stringers, gas windows, etc)
  • Logging: Drafting of striplogs, including curves (geology and drilling curves, chromatography, wireline logging), directional surveys, mud data, bit data, engineering comments, etc; use of consistent, easy-to-read-layouts, complete data

    Besides petrographic descritions of drill cuttings, striplogs include curves (geology and drilling curves, chromatography, wireline logging), directional surveys, mud data, bit data, engineering comments, etc; use of consistent, easy-to-read-layouts, comprehensive details.

    • Measured depth striplogs for vertical wells
    • Measured depth striplogs for deviated wells and build sections (include directional data)
    • TVD gamma logs for formation tops correlation on build sections of horizontal wells
    • Lateral logs detailing well cross-section and directional wellpath
    • Composite logs including chromatograph curves and ratios
    • Composite logs including wireline porosity and induction; or tailored to specific logs (spectral gamma, sonic, etc), core logs (large scale, based on core plugs or core tube ends)
Directional drilling supervision
  • Plotting actual well path against designed well trajectory
  • Identification of wellpath relative to stratigraphic markers (wellpath with TVD gamma and formation tops)
  • Constant communication with directional drillers to ensure wellpath follows optimal trajectory
    • best reservoir or
    • best wellbore placement or
    • optimal drill path
  • MWD/LWD supervision: data stream monitoring
Geosteering and reservoir navigation

Active on-site geosteering based on particular parameters or based on a combination of parameters, taylored to specific plays and reservoirs

  • cuttings samples (lithology, porosity, fossils)
  • MWD/LWD parameters (gamma, resistivity)
  • mud gas response and gas chromatography ratios
  • proximity data (ranging)
Mudlogging supervision

The advances in un-manned chromatographs/spectrographs eliminate the need for a dedicated mudlogger, un-manned chromatographs/spectrographs. The wellsite geologist can rig in, set up, supervise and maintain a modern gas detector:

  • Lag time calibration, maintain dryer system
  • Data collection
  • Chromatography curves plotted into composite logs
  • Ratio analyses in real-time
  • Geosteering / reservoir navigation aided by gas ratios
  • Gas shows logging (gas show tally) and interpretation (formation gas vs produced gas)
  • Supervise gas detector for abnormal high gas values, set alarm, alert rig personnel when safety boundaries are crossed
Special geological operations supervision
  • DST supervision
    • Operations supervision and coordination
    • Data collection
    • Data transmittal
    • Pressure gage curve plotting
    • Initial interpretation (formation damage, formation pressures, test efficiency)
  • Coring supervision
    • Core equipment coordination
    • Core recovery supervision
    • Correct labeling of core boxes or core tubes (for sleeved core)
    • Spot core description based on core plugs/tube end samples (lithological descriptions, core logs based on core plugs or core observation, facies identification)
  • Special sampling
    • Iso-tubes collection for gas/isotopes identification
    • Geo-jars collection for mud sample/wet cuttings sample, free oil/bitumen analysis
    • Sidewall coring supervision
    • XRD/XRF sample collection and analyses
  • Wireline logging supervision
    • Coordinating logging program with loggers
    • On site QC of logging process (timing, log quality, tracking lost time
    • Basic interpretation of wireline logs (formation tops, identification of porous zones and gas cross-over, identification of tight stringers)
    • Consistent report templates detailing logging operations

Our wellsite geologists are in constant communication with all involved personnel along established protocol and command chains

  • Operator
      (operations or play geologist)
    • Daily Reporting (operations reports, striplogs, data files) as requested
    • Reservoir evaluation
    • Communicate issues and deviations from prog
    • Receive instructions and disseminate according to protocol
  • On site
      Multi-discipline teams working for the same goal: a successful well
    • Drilling supervisor/coordinator: communicate geological requirements, receive drilling operations update, alerts about drilling challenges and restrictions
    • Directional driller and MWD operator: communicate targets, supervise data stream, communicate interpretation of data
    • DST/Coring personnel: communicate requirements, QC operations, collect data
    • Wireline loggers: communicate program requirements, QC logs, collect data

Our wellsite geologists provide comprehensive reports, using consistent formats, along established requirement guidelines

  • Daily Reports: striplogs, operations reports, data files, cuttings photos
  • Special geological operation reports: coring reports, wireline logging reports, DST reports, special sampling reports
  • Final Reports: striplogs, final geological report, data files, cuttings photos
  • All our subcontractors have valid and up to date safety tickets (H2S Alive, First Aid/CPR, WHMIS, TDG)
  • Personal Protective Equipment (fire retardant coverall with reflective stripes, top impact hard hat with inside suspension system type I, class B, steel toed boots, goggles/safety glasses with side protection, rubber lined gloves for work with oil based products, etc)
  • Cuttings sample preparation equipment with safety protection
  • Our subcontrators are trained to observe safety procedures and protocols (established travel protocol, observe health, safety and environmental requirement imposed by the operator, report safety hazards and environmental concerns)
  • Wellsite geologists set alarms for high gas and other critical parameters

© April, 2013, Chinook Consulting Services