×

Measuring formation density through casing

  • US 7,292,942 B2
  • Filed: 01/22/2004
  • Issued: 11/06/2007
  • Est. Priority Date: 01/24/2003
  • Status: Active Grant
First Claim
Patent Images

1. A method of determining formation density in a cased hole environment using a logging tool having a gamma ray source, a long spacing detector, and a short spacing detector, comprising:

  • developing one or more cased hole calibration relationships that utilize differences between scattered gamma rays observed by short spacing detectors and scattered gamma rays observed by long spacing detectors to determine corrected formation density values;

    using said cased hole calibration relationships and scattered gamma ray measurements obtained by said long spacing detector and said short spacing detector to determine the formation density; and

    storing the determined formation density on a computer-readable medium.

View all claims
  • 1 Assignment
Timeline View
Assignment View
    ×
    ×