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Heave compensated wireline logging winch system and method of use

  • US 6,216,789 B1
  • Filed: 07/19/1999
  • Issued: 04/17/2001
  • Est. Priority Date: 07/19/1999
  • Status: Expired due to Term
First Claim
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1. A system for compensating for vertical motion of a floating vessel comprising:

  • a. a wireline winch for raising and lowering a wireline cable within a wellbore, further comprising a winch motor for attaching to and rotatably moving a cable drum, the wireline cable having at least one logging measurement tool attached to an end of the wireline cable extending from the cable drum;

    b. a winch control means connected to the wireline winch wherein the winch control means receives vessel vertical motion data and logging tool speed set points and combines the vertical motion data and logging tool speed set points to produce a winch motor control signal for controlling the rotatable movement of the cable drum so as to cause the wireline cable to achieve movement within the wellbore at a controlled speed independent of vessel vertical motion; and

    c. depth computing means for receiving the vessel vertical motion data and measured wireline cable motion data and calculating a heave compensation depth error by combining the measured wireline cable motion data and the vessel vertical motion data.

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