Slim Hole Completion
A well that is completed without tubing. Usually, only small diameter casing is set and cemented. After perforating, formation fluids are produced out of the casing.
Source: API BULLETIN E3, Environmental Guidance Document: Well Abandonment and Inactive Well Practices for U.S. Exploration and Production Operations, First Edition, January 1993 (Reaffirmed June 2000). Global Standards