The materials on this website are provided for educational purposes with the intent of facilitating a better understanding of terms used in relation to drilling operations. These materials are for informational purposes only. The information is drawn from a wide variety of sources and is believed to accurately reflect the source material at the time that it was obtained; users are advised to check to see if any definition may have been altered within its cited source. Further, any definition of any term must be viewed within its original context; accordingly, users are strongly advised to consult the original source material identified for each term before relying on the definitions presented on this website for any purpose.

IADC has made every effort to assure the accuracy and reliability of the material presented; however, IADC makes no representation, warranty, or guarantee in connection with this material and hereby expressly disclaims any liability or responsibility for loss or damage resulting from its use. Information presented in English from non-English speaking countries, while derived from sources within those countries, should generally be considered as a non-official translation.