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Drilling and Excavation Technologies for the Future (1994) / Chapter Skim
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8. Borehole Stability
Pages 135-141

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From page 135...
... Difficult reservoirs include, for example, unconsolidated or poorly consolidated sediments, shales, complex reservoir geometries, naturally fractured reservoirs, and overpressured reservoirs. This had led to greater research emphasis related to the stability of circular rock openings International Society for Rock Mechanics, 1987; National Research Council, 1993~.
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From page 136...
... company has recently developed an extensive shale data base along with a patented method to determine in situ shale strengths from correlations with index properties derived from simple measurements on rock cuttings. Included in this data base are correlations to assist in providing proper mud weight guidelines for several high-angle of]
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From page 137...
... I Forrnationcharacterczationan~validatzon: Formation characterization should be undertaken during the drilling process, integrating the information obtained from drilling data, various types of logs, cutting data, seismic information, surface measurements, structural geology, and in situ stress measurements.
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From page 138...
... and outflow (loss of drilling mud) conditions (it should be realized that for heavily fractured reservoirs, in which secondary permeability is greatly affected by the applied stresses, care should be taken when assessing fluid transmissivity from borehole geometries)
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From page 139...
... 6 Drilling fluids: Drilling fluids technology is a moving target due to rapidly expanding needs, demands, and restrictions such as environmenta] remediation, air drilling, severe temperature conditions, increased lubricity requirements, restrictions on oil-base systems, discharge limitations, and horizontal and extended reach drilling.
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From page 140...
... Il3-140. Detournay, E., and Fairhurst, C., 1987, Two~imensional elastoplastic analysis of a long cylindrical cavity under non-hydrostatic loading: International Journal of Rock Mechanics, Mineral Science, and Geomechanical Abstracts, v.
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From page 141...
... 139-147. Maury, V., 1987, Observations, recherches et resultats recants sur les mecanismes de ruptures autour de galeries, isolees Report of the ISRM Commission on Failure Mechanisms Around Underground Excavations: Proceedings 6thISRM Congress, Montreal, Rotterdam, Balkema, p.
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Key Terms

  • rock mechanics
  • isrm congress
  • formation damage
  • borehole stability
  • formation characterization

  • drilling process
  • international society
  • international journal
  • mineral science
  • stress measurements

  • formation fluid
  • ruptures autour
  • underground excavations
  • pore pressure
  • formation characteristics

  • fractured reservoirs
  • geomechanical abstracts
  • failure mechanisms
  • stability models
  • reach drilling

  • reservoir characteristics
  • stable borehole
  • control measures
  • provided dust
  • stringent quality

  • drilling horizontal
  • complex drilling
  • drilling mud
  • weight guidelines
  • environmental applications


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