1. Applications: it is used to measure natural gamma ray radiation generated from the downhole formation. Based on the inherent radioactive intensity of a known geological mineral deposit, measuring depth of the can be determined. This tool really differs from a conventional one. It adopts special anti-shock means in its electric connectors, magnetic steel fastening and sensors and it can be directly connected with a perforating or coring gun to accomplish logging. The perforation or coring can be realized after the depth has been determined. 2. Advantages: single-conductor cable transmission. pulsed signal for gamma and analog signal for CCL. compatible with any surface logging system. rugged design so as to accomplish depth correlation and perforation in only one logging run and improve working efficiency. relay switch control is adopted to prevent mistaking perforation during logging. Compatible with a rugged analog CCL.
1. Tool diameter: 89mm. 2. Hole size: 102mm-508mm. 3. Shipping length: 1653.5mm. 4. Connection length: 1216mm. 5. Measuring point: 445mm. 6. Max temperature: 175℃. 7. Max pressure: 138MPa. 8. Working voltage/current of the cable head: 85V/33Ma. 9. Power/GR signal: #7-#10 for multi-conductor. 10. Upper/lower connection: 10 pins. 11. Amplitude of GR signal: 13V (with minus/plus pulse selectable). 12. Width of GR signal: 33μS. 13. Accuracy of GR: 1 pulse approximately equal to 1 API unit. 14. Maximum temperature drift of GR: ±15%. 15. Vertical resolution of GR: 203mm. 16. Maximum logging speed: 600m/h. 17. Seismic fortification grade: it meets the standard of ATLAS 070060-002. 18. Top thread connection size: 2 7/8-5SA-2G. 19. Bottom thread connection size: 2 7/8-10UNS-2A. 20. Logging speed requirement: 360m/h-600m/h.
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