This paper presents a knowledge based system developed to support the completion engineer during the process of well completion design. WELCOME (Well Completion gngineering) enforces a standard completion design procedure which improves safety and operational. aspects of completion activities. The system explains and justifies the approach to follow during the design by means of on-line manuals and references, and provides a full integration of commonly used computational packages. WELCOME relies on several advanced computer technologies, such as object orientation, knowledge based and hypertextual interaction to provide the user with a rich and friendly work environment. After a preliminary test phase, the system has been delivered to headquarters and operating Districts where it is routinely used.

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