×

Method and apparatus for determining logging tool displacements

  • US 6,459,992 B1
  • Filed: 06/21/2000
  • Issued: 10/01/2002
  • Est. Priority Date: 07/12/1999
  • Status: Expired due to Term
First Claim
Patent Images

1. A method for determining the displacements of a logging tool during a measurement interval of the logging tool in a borehole, the method comprising:

  • obtaining a set of accelerometer signals corresponding to accelerations of the logging tool along each of three orthogonal axes of the logging tool during the measurement interval;

    double integrating the set of accelerometer signals to obtain corresponding displacements of the logging tool as a function of the initial velocity of the logging tool and the gravitational acceleration, wherein the initial velocity of the logging tool and the gravitational acceleration are unknown;

    assuming a set of feasible initial velocities for the logging tool;

    for each feasible initial velocity, estimating the gravitational acceleration, calculating the displacements of the logging tool using the feasible initial velocity and the estimated gravitational acceleration, and determining the maximum of the calculated displacements; and

    setting a lower bound on the displacements of the logging tool to the minimum of the maximum of the calculated displacements.

View all claims
  • 0 Assignments
Timeline View
Assignment View
    ×
    ×