Specialty Drilling Applications | Schlumberger

Specialty Drilling Applications

Casing-drilling and liner-drilling technology

Eliminate dedicated casing runs by casing and isolating the formation while drilling

TDDirect casing-drilling and liner-drilling technology delivers a high-quality wellbore by casing and isolating the formation while drilling. Each foot of 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, TDDirect technology has recorded equal or better on-bottom ROP and has reduced the time spent on drilling and casing operations by more than 30%.

Greater borehole stability and well control

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.

TDDirect
Drilling with conventional drillpipe (left) allows a larger annulus, while drilling with casing (right) minimizes annulus size; rotating casing smears cuttings into the borehole wall, sealing pores in the formation to reduce fluid losses and producing a stronger borehole for improved cementing.

Since 1998, TDDirect technology has increased drilling efficiency in a wide range of land and offshore applications worldwide: more than 1,450 wells, totaling 4 million ft, deeper than 15,500 ft.

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