Description
GCT
The Gamma Ray/Collar Locator/Temperature Tool (GCT) can be run together with the FHT Telemetry tool providing the following signals:
- Gamma Ray PMT (GR): measure the natural gamma ray levels within the wellbore.
- Collar Locator (CCL): measure changes in metal mass, creating a better chance of detecting the small gap in flush joint pipe, or collars in heavily corrosion-encrusted casing.
- Temperature Tool (RTD): The Platinum Resistance Thermometer Tool measures Downhole temperatures by measuring the resistance of a fast responding platinum resistance element. The probe is contained in a thin, pressure tight Inconel® needle, protruding into an open slot through which borehole fluid can flow.
Specifications
Gamma Ray | |
Operating Voltage | +18VDC |
Current draw | 10mA |
Depth Resolution | 6′ typical |
High Voltage Power Supply |
700VDC to 1,800VDC (controlled from surface) |
Temperature Sensor |
|
Operating Voltage |
+18VDC |
Current draw |
10mA |
Resolution |
0.15 deg C |
Max. range |
+50 deg C to 260 deg C |
CCL |
|
Operating voltage |
+18VDC |
Current draw |
10mA |
Sensitivity |
1mV |
Gain |
Controlled from surface |
Dimensions |
1-11/16” (43mm) O.D. by 46.63” (1,1184.4mm) Long |
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