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 service

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 efficiency.

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.