Study on the FOG-Based Well-Trajectory-Logging Tool
- ChunHua Ren (Chongqing University) | Mo Li (Chongqing University) | LeiLei Li (Chongqing University) | Yongyuan Duan (Chongqing University) | Haiquan Weng (Chongqing University)
- Document ID
- Society of Petroleum Engineers
- SPE Drilling & Completion
- Publication Date
- September 2012
- Document Type
- Journal Paper
- 363 - 367
- 2012. Society of Petroleum Engineers
- 1.5.1 Surveying and survey programs, 5.6.1 Open hole/cased hole log analysis
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- 379 since 2007
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The commonly used technology in well-trajectory logging, for both the oil and the gas well, is the magnetometer. However, it cannot work well in the magnetic-interfered or nonmagnetic environment, such as in a cased well or an iron mine. This paper presents a new trajectory-logging tool with a small diameter. Configured by a three-axis FOG unit and three quartz accelerometers, the logging tool allows for continuous attitude and trajectory measurement. High-temperature-caused accuracy degradation is the major error source for the underground environment. To diminish the thermal-related error, a flask stuffed with thermal-insulation material was embedded in the tool body; meanwhile, a wavelet neural network was used for identification of and compensation for the temperature drift. The system configuration, trajectory-resolution algorithm, and temperature-compensation algorithm are presented in this paper. Testing results show that the inclination accuracy is better than ±0.1°, with a range of 0 to 180°, and the azimuth accuracy is better than ±2°, with a range of 0 to 360°. The new logging tool resolves continuous trajectory-measurement problems in a magnetic-interfered or a nonmagnetic environment. Moreover, the capability of all-attitude measuring facilitates horizontal-well logging. Therefore, broad applications and good marketing could be anticipated for this new logging tool.
|File Size||3 MB||Number of Pages||5|
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