Balanced Cement Plug
The result of pumping cement through drill pipe, workstring, or tubing until the level of cement outside is equal to that inside the drill pipe/ workstring/ tubing. The pipe is then pulled slowly from the Cement slurry, leaving the plug in place. The technique is used in both open hole and cased hole applications when the wellbore fluids are in static equilibrium.
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