Dewarless Logging Tool - 1st Generation

HENFLING,JOSEPH A. ; NORMANN,RANDY A.

Sandia National Laboratories

关键词: Geothermal Legacy;    Thermal Insulation;    Reservoir Temperature Geothermal Legacy;    Geothermal Wells;    15 Geothermal Energy;   

DOI  :  10.2172/763144
RP-ID  :  SAND2000-1680
RP-ID  :  AC04-94AL85000
RP-ID  :  763144

美国|英语

来源: UNT Digital Library

【 摘 要 】

This report focuses on Sandia National Laboratories' effort to create high-temperature logging tools for geothermal applications without the need for heat shielding. One of the mechanisms for failure in conventional downhole tools is temperature. They can only survive a limited number of hours in high temperature environments. For the first time since the evolution of integrated circuits, components are now commercially available that are qualified to 225 C with many continuing to work up to 300 C. These components are primarily based on Silicon-On-Insulator (SOI) technology. Sandia has developed and tested a simple data logger based on this technology that operates up to 300 C with a few limiting components operating to only 250 C without thermal protection. An actual well log to 240 C without shielding is discussed. The first prototype high-temperature tool measures pressure and temperature using a wire-line for power and communication. The tool is based around the HT83C51 microcontroller. A brief discussion of the background and status of the High Temperature Instrumentation program at Sandia, objectives, data logger development, and future project plans are given.