Experimental assessment of the bleed-and-lube method for removal of sustained casing pressure
Document Type
Conference Proceeding
Publication Date
1-1-2001
Abstract
In this study, a series of experiments was performed to investigate a procedure for killing sustained casing pressure (SCP) by the bleed-and-lube method of injecting heavy brine into the annulus. The procedure involves bleeding fluids from the annulus and lubricating in weighted fluids in order to displace annular fluid with the heavy brine. A pilot-scale model of the well annulus used in this study allowed measurements of hydrostatic pressure and density change resulting for the bleed-and-lube method. Three concepts of annular fluid displacement were investigated: brine or mud lubricated into a water-filled annulus, brine into bentonite slurry, and immiscible displacement. The experiments showed that annular density increased after many injections of brine into the water-filled annulus. They also showed even more desirable performance using immiscible fluid. However, the experiment demonstrated an inability to displace drilling mud with brine due to a flocculation effect.
Publication Source (Journal or Book title)
Canadian International Petroleum Conference 2001, CIPC 2001
Recommended Citation
Nishikawa, S., Wojtanowicz, A., & Smith, J. (2001). Experimental assessment of the bleed-and-lube method for removal of sustained casing pressure. Canadian International Petroleum Conference 2001, CIPC 2001 https://doi.org/10.2118/2001-041