Case Study Drilling with Liner Rescues Well in Deepwater Gulf of Mexico and Saves at Least USD 20 Million
Eliminating a dedicated liner run through a high-loss gassy salt zone reduced rig time by multiple days.
Casing-drilling and liner-drilling technology
Casing- and liner-while-drilling technology delivers a high-quality wellbore because each foot of the borehole is drilled and cased off simultaneously, eliminating the need for separate casing or liner runs. When TD is reached, the borehole is ready for cementing. Compared with the performance of conventional drilling systems, Schlumberger's casing- and liner-while-drilling technology has recorded equal or better on-bottom ROP and has reduced the time spent on drilling and casing operations by more than 30%.
Using casing as a drillstring smears cuttings into the borehole wall, resulting in an action termed the plastering effect. This action strengthens the wellbore while it seals pores in the formation to reduce fluid loss.
Directionally drilling with coiled tubing (CT) technology maximizes production in short-radius applications. Specifically designed to access additional reserves in thru-tubing reentry drilling applications, Schlumberger's CT directional drilling technology maximizes reservoir contact without the cost of removing existing completions or production tubing—all while producing the reservoir and minimizing formation damage.