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Closed loop drilling system

  • US 5,842,149 A
  • Filed: 10/22/1996
  • Issued: 11/24/1998
  • Est. Priority Date: 10/22/1996
  • Status: Expired due to Term
First Claim
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1. An automated drilling system for drilling oilfield wellbores at enhanced rates of penetration and with extended life of drilling assembly, comprising:

  • (a) a tubing adapted to extend from the surface into the wellbore;

    (b) a drilling assembly comprising a drill bit at an end thereof and a plurality of sensors for detecting selected drilling parameters and generating data representative of said drilling parameters;

    (c) a computer comprising at least one processor for receiving signals representative of said data;

    (d) a force application device for applying a predetermined force on the drill bit within a range of forces;

    (e) a force controller for controlling the operation of the force application device to apply the predetermined force;

    (f) a source of drilling fluid under pressure at the surface for supplying a drilling fluid(g) a fluid controller for controlling the operation of the fluid source to supply a desired predetermined pressure and flow rate of the drilling fluid;

    (h) a rotator for rotating the bit at a predetermined speed of rotation within a range of rotation speeds;

    (i) receivers associated with the computer for receiving agnate signals representative of the data;

    (j) transmitters associated with the computer for sending control signals directing the force controller, fluid controller and rotator controller to operate the force application device, source of drilling fluid under pressure and rotator to achieve enhanced rates of penetration and extended drilling assembly life.

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