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ICL-A Induction Collar Locator
Our patented (U.S. Pat. No. 6,084,403) Induction Collar Locator tool is used to make depth corrections to logs by identifying the location of casing collars and other mechanical features of the casing such as thickness variations or perforations.
It uses a low-frequency induction method with two receiver coils arranged to provide an absolute phase measurement that senses the average thickness of metal around the tool, along with a two-inch differential measurement to sense smaller details such as collars.
The ICL response is independent of logging speed, unlike conventional collar locators, and most importantly it sees flush-joint collars just as well as any other kind.
Also, since it does not contain any magnets, there is no problem of sensitivity degradation with temperature or time and there are no special handling or safety problems.
The tool works best when centralized, unlike most other collar locators, but operates very well not centered when conditions require.
It will operate in all casing/tubing sizes although the response is best in casing sizes from 4-1/2 to 9-5/8 inch diameter and weights up to 35 lb./ft.
The small tool diameter allows casing inspection without the need to pull tubing.
Tubing joints are also recorded, as are casing collars through tubing.
The ICL-A is available with either the CBG Digital Telemetry or with a modulated current output for standalone applications.
The graphs below show the tool response characteristic when used in the casing inspection mode. The second chart shows the effect of an additional outer casing.
