Research on casing wear monitoring technique based on detection of tool joints and its field test

Casing wear monitoring is basis of scientific casing wear prevention work, and now there is no scientific and convenient casing wear monitoring techniques in current drilling engineering. Wear characteristics of the casing - drill pipe system is further analyzed, basic theory and analysis methods of casing wear monitoring based on detection of tool joints are established through reasonable assumptions, and corresponding computer software is developed to form a complete set of casing wear monitoring technique which achieves quantitative calculation of casing wear at any depth of the well. Field tests indicate that this casing wear monitoring technique based on detection of tool joints can calculate the well casing wear volume (or weight) at any depth easily, its monitoring and computation are simple and the process has no impact on drilling, so it is suitable method for field operations.