WITSML - tubular component - component schema. The order of the components in the XML instance is significant. The components are list in the order that they enter the hole. That is, the first component is closest to the bit. Type of component. The sequence within which the components entered the hole. That is, a sequence number of 1 entered first, 2 entered next, etc. Description of item and details. Internal diameter of object. Outside diameter of the body of the item. Maximum outside diameter. Length of the item. Average length of joint for tubulars. Number of joints per stand of tubular. Weight per unit length. Material grade for the tubular section. Minimum pass through diameter. Yield stress of steel - worn stress. Torque yield stress - worn stress. Fatigue endurance limit. Fish neck length. Fish neck inside diameter. Fish neck outside diameter. Closed end displacement. Burst pressure. Collapse pressure. Service class. Wall thickness wear (commonly in percent). Wall thickness. Box/Pin configuration. Bending stiffness of tubular. Axial stiffness of tubular. Torsional stiffness of tubular. Type of material. Maximum dogleg severity. Name of vendor. Component name from manufacturer. An identification tag for the component tool. A serial number is a type of identification tag however some tags contain many pieces of information. This structure just identifies the tag and does not describe the contents. Bit object. Total area of nozzles. Set of nozzle objects. Examples of items that have nozzles are bit, hole opener, circulation sub, jetting sub, pressure relief sub. Connection object. Jar object. MWD (measurement while drilling) tool object. Motor object. Stabilizer object. Bend object. Hole opener object. Rotary Steerable Tool. A container element that can contain custom or user defined data elements. Unique identifier for the component.