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Oilfield tubular spin-in and spin-out detection for making-up and breaking-out tubular strings

  • US 8,074,537 B2
  • Filed: 09/10/2007
  • Issued: 12/13/2011
  • Est. Priority Date: 09/08/2006
  • Status: Active Grant
First Claim
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1. An oilfield tubular spinner for an oilfield tubular torque wrench, the oilfield tubular spinner comprising:

  • a powered spin roller including an axis of rotation;

    a spin motor operatively connected to, and configured to drive, the powered spin roller to rotate about its axis of rotation, anda shoulder-up system comprising;

    a pressure sensor configured to sense a fluid pressure of a system driving the spin motor;

    a memory storage configured to store a pressure threshold indicative of a motor pressure during a shoulder up condition; and

    a comparator configured to continuously compare output from the pressure sensor to the pressure threshold, the comparator asserting the shoulder-up condition when the pressure sensor output reaches the pressure threshold,wherein the shoulder-up, system is configured to detect a shoulder-up condition of a pair of tubulars being driven to threadedly connect by the powered spin roller and to initiate spin motor shutdown subsequent to the detection of the shoulder-up condition, wherein the detection is monitored by an oilfield tubular spinner control system and based on a plurality of variables.

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