Electronically activated underreamer and calliper tool

  • US 8,528,668 B2
  • Filed: 06/16/2011
  • Issued: 09/10/2013
  • Est. Priority Date: 06/27/2008
  • Status: Active Grant
First Claim
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1. An integrated expansion and calliper tool that permits simultaneous underreaming and measurement of the diameter of a wellbore as drilled by a drilling rig, comprising at least one radially extendable cutter block movable within a tool body to underream, at least one calliper to measure wellbore diameter and housed within a tool body, and a processor to receive caliper data, the at least one calliper and the processor being inter-linked to permit delivery of a predetermined wellbore diameter;

  • wherein at least one positional sensor determines a position of the cutter block relative to the tool; and

    where measurements are processed by the processor that compares the measured wellbore diameter with a minimum programmed diameter and the cutter block position to verify correct operation of the tool.

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