Managed Pressure Drilling (MPD) has gained industry acceptance with surface BOP stacks where improved control of downhole pressure has been achieved. The industry is currently beginning to see implementation of MPD systems in deepwater environments where narrower drilling margins make improved pressure control even more important. Despite the evident need for such applications the industry has been slow to fully utilize MPD techniques in deepwater. The question this paper seeks to address is, "What is preventing us from employing the same MPD systems currently being used with surface stacks in a deepwater environment?" This question encourages challenging conventional modes of thinking in the industry concerning risks pertaining to risers and well control when utilizing MPD systems. This paper draws on some of the difficulties, thinking, and achievements when such a system was implemented for drilling a deepwater GOM well. MPD in deepwater involves new equipment, capabilities, and risks. Full utilization of MPD systems in a deepwater environment requires re-thinking several things including primary well control and the conditions to which the riser is exposed.
The purpose of this paper is to provide field experience feedback on achieving surface casing integrity with the use of an expandable steel patch. Casing integrity may be jeopardized during cement remediation or due to mechanical failure. If cement remediation requires casing perforations, then an expandable steel patch can be used to provide pressure integrity across the perforations. If casing pressure test cannot be achieved due to mechanical failures such as leaking DV tool or casing collar leak, a similar approach can be used to achieve pressure integrity. This paper will describe how to restore casing integrity allowing maximum pass-through diameter to continue drilling operations and maintain planned casing sizes when presented with these challenges. Statement of Theory and DefinitionsCementing is used to anchor the casing string in the hole and to effectively seal the annulus to prevent any migration from downhole fluids. It also provides zonal isolation between production intervals and ground water to prevent contamination and is used to provide support for the casing or liner string. A good cement job will also provide a protective outer sheath to help prevent potential corrosion.
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