Measuring formation density through casing
First Claim
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.
1 Assignment
0 Petitions
Accused Products
Abstract
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 that includes 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, and using the cased hole calibration relationships and scattered gamma ray measurements obtained by the long spacing detector and the short spacing detector to determine the formation density. An associated article of manufacture and computerized well logging system are also described.
-
Citations
19 Claims
-
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 Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
-
-
16. An article of manufacture, comprising:
-
a computer useable medium having a computer readable program code means embodied therein for determining formation density in a cased hole environment, the computer readable program code means in said article of manufacture comprising; computer readable program means for determining formation density in a cased hole environment and storing the determined formation density on a computer-readable medium, the program means using one or more cased hole calibration relationships and measurements made by a logging tool having a gamma ray source, a backscatter detector, a long spacing detector, and a short spacing detector, where the backscatter detector is disposed between the gamma ray source and the short spacing detector.
-
-
17. A computerized well logging system for determining formation density in a cased hole environment, comprising:
-
a logging tool having a gamma ray source, a backscatter detector, a long spacing detector, and a short spacing detector, the backscatter detector disposed between the gamma ray source and the short spacing detector; a computing module and/or processing circuitry, connected to said logging tool, having means for calculating formation density from gamma ray scattering measurements obtained by said long spacing detector and gamma ray scattering measurements obtained by said short spacing detector using one or more cased hole calibration relationships, and means for storing the determined formation density on a computer-readable medium. - View Dependent Claims (18, 19)
-
Specification