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Drilling and Excavation Technologies for the Future (1994) / Chapter Skim
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2. Advanced Drilling Systems
Pages 7-11

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From page 7...
... In most applications, the drill head is a drill bit that breaks rock by mechanical or mechanical-hydraulic action. The rate of breakage is governed by bit design, including the bit's effectiveness in breaking rock and resisting wear, and by rock type, temperature, pressure, and operating procedure (the experience and aptitude of the driller can have a considerable impact on how fast and effectively drilling proceeds)
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From page 8...
... In most drilling systems, there is little or no downhole sensing of rock or bit conditions, and guidance systems, if present, are primitive. Although measurement-while-drilling and logging-while-drilling technologies exist, in most cases target acquisition requires interruption of the drilling process to insert special tools to obtain rock samples (core)
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From page 9...
... The second group includes processes such as drill bit sensing (e.g., monitoring bit wear) , rock properties sensing and evaluation, drill bit or drilIstring steering, and welIbore damage sensing.
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From page 10...
... .......... Rock breaking Key element in drilling Evolutionary process: bottleneck to increased drilling rate Debris removal Potential bottleneck, Evolutionary especially in tunneling Borehole stabilization | Discontinuous process | ; Evolutionary Dnll bit sensing and Technology not avail- Revolutionary evaluation able Rock properties Some measurement- Revolutionary sensing and evaluation while~nlling capabili ty now exists Dnll bit positioning and Notable recent advanc- Revolutionary steenag es in steering Borehole sensing Technology not avail- Revolutionary able The smart drilling system does not currently exist, but it is presaged by recent dramatic advancements in directional drilling and in technologies of measurement while drilling.
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From page 11...
... The most effective means of operational implementation of the smart drilling systems and all over secondary goals recommended by this committee is the adoption of an integrated systems approach to all major drilling practices. In the integrated systems approach, all component parts and processes are designed to function in unison at an optimum level of perfo~`ance without excessive redundancies and without overloading any of the interdependent component parts and processes.
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Key Terms

  • drill bit
  • directional drilling
  • debris removal
  • drill head
  • drilling targets

  • rock properties
  • includes processes
  • drilling success
  • properties sensing
  • bit sensing

  • drilling fluid
  • advanced applications
  • substantial horizontal
  • petroleum industry
  • operational implementation

  • required improvements
  • bit wear
  • breaking rock
  • considerable depth
  • secondary goals

  • head comminutes
  • target safely
  • rock breakage
  • acquisition requires
  • pressure pulses

  • elaborate mechanical
  • horizontal distances
  • target acquisition
  • costly breakdowns
  • insert special


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