Spectral Gamma Ray and CCL Tool
Collects data for correlation and formation evaluation
Applications
- Correlation to formation and wellbore tubulars
- Formation evaluation of potassium (K), uranium (U) and thorium (Th) elements
- Mineral composition and clay content determination
Features and Benefits
- Fully Probe® high-speed digital (HD) platform compatible with fast telemetry
- Available in SRO and memory
- Combinable with ArrayPro and RAS™ for comprehensive cased-hole formation evaluation
Tool Description
The Weatherford cased-hole spectral gamma ray (SGR) and casing-collar locator (CCL) operates on a common tool bus and can be combined with any HD tool platform tools.
The SGR tool consists of a CCL sensor signal and a sodium iodide gamma-ray detector and electronics. The tool outputs are total GR counts, a 256-channel spectrum of gamma ray energy and the CCL signal. Processing on the surface system analyses the gamma ray spectrum for the three most common natural radioisotopes: potassium (K), uranium (U) and thorium (Th).
Data from SGR processing is used for mineral composition and clay volume calculations. The tool may provide useful insight to radioactive deposits in and around the wellbore.
Specifications
Ratings and Dimensions
Maximum temperature | 350°F (177°C) |
Maximum pressure | 15,000 psi (103.4 MPa) |
Outside diameter | 2.75 in. (70.0 mm) |
Makeup length | 47.7 in. (1,212.0 mm) |
Weight | 42.1 lb (19.1 kg) |
Measurement
Depth of investigation | 9.5 in. (241.0 mm) |
Precision | 0.5% |
Accuracy | K +/- 0.5%, U +/- 5,000 ppm, Th +/- 5,000 ppm |
Maximum logging speed | 25 ft/min (7.6 m/min) |
Hardware Characteristics
Materials | Titanium | Corrosion-resistant materials used throughout |
Combinability | RAS |
Acquisition mode | Real-time (with TCU) |
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