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System for drilling deviated boreholes

  • US 5,163,521 A
  • Filed: 08/27/1991
  • Issued: 11/17/1992
  • Est. Priority Date: 08/27/1990
  • Status: Expired
First Claim
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1. A method of drilling a borehole through earth formations with a drill string including a rotary bit at the lower end thereof, and obtaining information regarding a downhole parameter indicative of the borehole or the earth formations, the bit being powered by a drill motor within the drill string and including a power assembly of the drill motor for converting pressurized fluid to rotation of a mandrel interconnected with the bit, a bearing assembly between the power assembly and the bit for guiding the mandrel, and a bearing housing for housing the bearing assembly, the method comprising:

  • sensing the downhole parameter using a sensor fixedly located in the drill string at a location axially below the power assembly;

    transmitting signals functionally related to the sensed downhole parameter from a location axially below the power assembly;

    receiving the transmitted signals at the surface to determine the downhole parameter; and

    altering the drilling trajectory in response to the transmitted signals.

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