Stage Cementing Tool
A tool installed in the casing string through which the stage cementing operations are conducted. The tool is placed in the casing string as the casing is being installed into the borehole. After the primary cement job has been completed, and the slurry has hardened, ports in the tool are opened so stage-cementing operations can proceed.
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