NEHRP Clearinghouse

Title
Feasibility Study for a Seismic Drill Bit Location and Guidance System.
File
PB81146813.pdf
Author(s)
Katz, L. J.
Source
National Science Foundation, Washington, DC. Engineering and Applied Science., January 1980, 24 p.
Abstract
The feasibility of seismically monitoring a rotary drill bit as a means of continuously tracking the location of the bit as it drills into the earth was investigated. A beamsteering array processing technique was used to locate the drill bit. Recorded data is analyzed in a manner similar to that used to locate earthquakes. Results demonstrate that the drill bit generates a unique coherent signal which can be used to locate the bit in the ground. Comparison of results to a conventional method confirms the deviation angle detemined by the new seismic method. This method also supplies azimuthal direction. Benefits to be derived from this study are a reduction in drilling costs for deep wells and a method of providing the driller with information that is needed to reach a traget at depth.
Keywords
; Rotary drill bits; Seismic detection; Directional drilling; Rotary drilling; Seismic arrays; Azimuth indicators; Position finding