Minimize NPT and risk of drilling in unstable formations
OMV Petrom, the largest oil producer in Romania, planned to drill a well
in the Black Sea to a TD of 2,320 m. Consequently, the operator sought to
maximize reliability and efficiency by reducing NPT and the risk of drilling
through unstable formations.
Optimize drilling performance with casing bit and casing drilling
To improve drilling performance in the 20-in section, the XCD drillable alloy casing bit from Smith Bits, a Schlumberger company, was
recommended. The casing bit is designed to drill out quickly and efficiently
with the same PDC bit used to the drill the next interval.
For the 9 5/8-in section, the Allegro CD directional casing-while-drilling service was selected for its ability to use the directional BHAs and PDC bits to drill
and case at the same time, which reduces NPT while improving drilling
Set 20-in casing drilling record, saved 62 h of rig time
The XCD drillable alloy casing bit drilled a total footage of 753
m in 69 h at an ROP of 24 m/h, setting a record for section length and depth
for 20-in casing drilling in Europe. After reaching TD, the high-quality
wellbore condition resulted in an excellent cementing operation. In the 9
5/8-in section, the Allegro CD service achieved an ROP of
29 m/h, saving the operator 62 h of rig time.