MWD Vibration Measurements: A Time for Standardization
- Karen Bybee (JPT Assistant Technology Editor)
- Document ID
- Society of Petroleum Engineers
- Journal of Petroleum Technology
- Publication Date
- December 2009
- Document Type
- Journal Paper
- 62 - 64
- 2009. SPE/IADC Drilling Conference and Exhibition
- 1 in the last 30 days
- 133 since 2007
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This article, written by Assistant Technology Editor Karen Bybee, contains highlights of paper SPE 119877, "MWD Vibration Measure ments: A Time for Standardisation," by Svein Magne Osnes, SPE, StatoilHydro ASA; Per Amund Amundsen, SPE, University of Stavanger; and Tore Weltzin, SPE, Erik Nyrnes, SPE, Brita Lucie Hundstad, SPE, and Gaute Grindhaug, SPE, StatoilHydro ASA, originally prepared for the 2009 SPE/IADC Drilling Conference and Exhibition, Amsterdam, 17-19 March. The paper has not been peer reviewed.
Since downhole vibration measurements were introduced in the early 1990s, these measurements have become extremely useful for improving drilling efficiency. Most operators will specify a vibration sensor of some sort to be run with most measurement-while-drilling (MWD) and logging-while-drilling (LWD) applications. Unlike most other downhole measurements, there is no industrial standard for how to sample, process, and present the vibration data. This raises a few issues that the full-length paper attempts to address.
The lack of standardization of vibration measurements and vibration-data methodology recently has become apparent from several different points of view:
- Vibration readings cannot be correlated easily and compared from well to well, making it difficult to learn from experiences with different drill bits and drilling tools.
- It is difficult to use a fair and consistent policy to handle charges from service companies for tools that allegedly have been damaged or scrapped as a result of severe vibrations.
- Tool specifications from different service companies cannot be compared easily during tender evaluations.
- It is difficult to perform any form of quality control of contractor’s vibration data, including calibration of vibration sensors.
- It is difficult for drilling engineers or drilling-contractor personnel to develop any universal skills in real-time drilling optimization on the basis of vibration data because the data are not comparable.
Unlike vibration measurements, most other MWD and LWD data have been subjected to strict standardization.
Similar standards exist for other formation measurements such as neutron porosity logging, density logging, and sonic logging, but no industry procedure or standards exist for the calibration, measurement range, or measurement principle of downhole vibration tools.
During drilling, bottomhole equipment is subject to severe accelerations in the form of single or repetitive shocks and as sustained vibrations of the drillstring, both in the drilling direction and transverse to it. Such accelerations can interfere with the drilling operation and can cause equipment failures and destruction of downhole tools, which again has an undesirable effect on the operational costs as a result of time lost for tripping and charges for damaged equipment.
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