7.6.1 Data Model

Figure 7.6.1-1 is the UML diagram of the risk data object. Certain elements are required for the risk object to be both valid and of practical use. Other elements represent a “best practice” that is helpful for the risk to be properly interpreted. The risk data object:

• Must reference its parent wellbore.
• Must include these elements:

• Type: the type of risk, e.g. gas kick.

• Category: the category of risk, e.g. hydraulics or equipment failure”

Best Practice:

• DTimStart and DTimEnd: if applicable, date and time that the risk started and ended.
• MdHoleStart and MdHoleEnd: if applicable, the measured depth at the start and end of the risk.

• TvdHoleStart and TvdHoldEnd: if the risk is associated with a depth range and MdHoleStart/MdHoleEnd have not been provided, then these should be provided.

• SeverityLevel: severity level of the risk, values 1 through 5, with 1 being the lowest.
• ProbabilityLevel: probability level of the risk, values 1 through 5, with 1 being the lowest.
• Summary: a summary description of the risk. If needed, provide more information in Details.
• Contingency: the plan of action if the risk materializes.

• Mitigation: plan of action to ensure the risk does not materialize.

Figure 7.6.1-1 UML diagram of the risk data object. Note: RiskSubCategory has been truncated to fit the page. For the complete list, see the WITSML UML model (XMI file).