Glossary

Accelerometer correction

Tools usually do not move up the well bore with a fixed velocity. Excess movements due to friction, sticking, rig-heave and cable movement all influence a tool's actual speed within a well. As most dipmeter and borehole data are acquired in time rather than by depth we need to know this tool movement to place the data at a correct depth point. Using cable speed and doubly integrated acceleration data, all in conjunction with suitable filters, it is possible to determine a tools velocity and its position at any given time. This allows the derivation of a shift required to place the data at their correct positions.

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About the glossary
This listing is not exhaustive or definitive, do not expect Oxford English Dictionary standards; it is aimed at those who need to understand basic principles and those that read reports on dipmeters and borehole images requiring some technical help to get the most from such documents.

We have attempted to make the descriptions and explanations generic, giving the glossary a wide application and appeal, with minimal, if any, commercial bias. If you spot any mistakes, omissions or any problems with the explanations, please do not hesitate to contact us, and we will try to accommodate your comments.

Acknowledgements
This listing has been derived by Task Geoscientists. All external sources are fully acknowledged.