E - Fixed Constructions – 21 – B
Patent
E - Fixed Constructions
21
B
255/6
E21B 4/06 (2006.01) E21B 4/14 (2006.01) E21B 7/06 (2006.01) E21B 7/26 (2006.01) E21B 47/022 (2006.01)
Patent
CA 1274817
STEERING AND CONTROL SYSTEM FOR PERCUSSION BORING TOOLS ABSTRACT A control system guides a boring tool in a borehole. The tool has a longitudinal tool axis and includes a driver for advancing the tool axially through the earth and steering mechanism for directing the motion of the tool relative to the tool axis in response to control signals. The control system includes an axial electromagnetic source for generating an axial alternating magnetic field directed along an axial source axis. A sensing assembly remote from the source means includes first and second pickup coils for sensing the alternating magnetic field. Each of the first and second pickup coils has a respective coil axis and is rigidly mounted in respect to the other with their respective axes at a substantial angle with respect to each other, defining a sensing assembly axis substantially normal to both coil axes. Each coil generates a respective null electrical signal when the lines of magnetic flux at the respective coil are normal to the respective coil axis. Either the source of the sensing assembly is rigidly mounted on the tool, preferably the source. The outputs of the sensing coils are used to determine the direction of lines of magnetic flux at the sensing assembly, and indicate the attitude of the source relative to the sensing assembly. This permits guiding of the tool by control signals sent to the tool.
602247
Bridges Jack E.
Cohen John H.
Enk Joseph O.
Givler Gregory C.
Maurer William C.
Gas Technology Institute
Macrae & Co.
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