SOME BASIC ASPECTS OF DIAMOND DRILLING

A THEORETICAL MODEL OF THE CUTTING ACTION OF A DIAMOND BIT IS INTRODUCED. DIAMOND BIT DESIGN IS DISCUSSED UNDER THE HEADINGS, BIT TYPE, DIAMOND ORIENTATION, DIAMOND EXPOSURE, DIAMOND SPACING, MATRIX PROPERTIES AND WATERWAYS. THE THEORETICAL RELATIONS BETWEEN THE SIX OPERATING VARIABLES, THRUST, ROTARY SPEED, DRILLING TORQUE, PENETRATION RATE, DRILLING FLUID FLOW AND FLUID PRESSURE, ARE DEVELOPED. A LABORATORY TEST RIG WAS DEVELOPED TO CONTINUOUSLY RECORD ALL SIX OPERATING VARIABLES. RESULTS SHOW THAT DRILLING TORQUE IS PROPORTIONAL TO THRUST, AND THAT PENETRATION RATE IS PROPORTIONAL TO ROTARY SPEED. PENETRATION RATE INCREASES WITH THRUST, BUT THE RELATION IS NOT LINEAR. SPECIFIC ENERGY OF DRILLING REDUCES WITH THRUST BUT IS INDEPENDENT OF ROTARY SPEED. ALL RESULTS ARE CORRECTED BACK TO NEW BIT CONDITIONS BY AN EXPONENTIAL "WEAR" CURVE. /AUTHOR/

  • Authors:
    • Rowlands, D
  • Publication Date: 0

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Filing Info

  • Accession Number: 00230448
  • Record Type: Publication
  • Source Agency: Transport and Road Research Laboratory (TRRL)
  • Report/Paper Numbers: Conf Paper
  • Files: TRIS
  • Created Date: Nov 14 1973 12:00AM