8.1 Scope, Use Case s, and Key Concepts

The set of completion data objects includes the completion equipment from the sandface connection to the reservoir, up to and including the tubing spool/tubing hanger, for use cases defined in this chapter. It can be used to transfer or exchange data between software applications or databases for these high-level workflows:

• Drilling and initial installation of the completion.
• Handover from drilling to production.
• Transfer of data between engineering applications.
• Well services through the life of an asset (which may involve links to other WITSML or similar data objects, for example, for the details of drilling, cementing, fracturing and other “job” types yet to be supported).

These use cases are supported:

• “Snapshot” of a completion at one instant in time
• “Change Log” of events, capturing the changes to a completion between two moments in time
• “Cumulative History” of the well over its whole life

The three main use cases relate to each other to enable systems to track progress and changes made to the completion, and to transfer the actual configuration at any instant in time. However, while the set of completion data objects supports these use cases, the ability of individual software applications to support them may vary.

These concepts are explained below with diagrams to relate them to real-world assets and activities.

Note that while the well completion hardware is modeled explicitly in detail and operations are handled with as much detail as existing data objects allow, flow paths of fluids through the whole completion are modeled in a limited sense. The connections to the reservoir are modeled, and these are associated with ports (or flows) at the wellhead. However, currently the detailed path in between is not explicitly described.