Schlumberger

Case Study: TDDirect Casing-While-Drilling Service and Direct XCD Casing Bit Save OMV Petrom 62 h

Drillable alloy casing bit drills 892 m, sets record for section length and depth for 20-in casing drilling in Black Sea

Challenge: Drill to TD of 2,320 m while minimizing NPT and risk of drilling through unstable formations.

Solution: Use and Direct XCD drillable alloy casing bit to drill the 20-in section and TDDirect CD casing-while-drilling service for the 9 5/8-in section.

Result:

  • Achieved ROP of 29 m/h in the 9 5/8-in section, saving 62 h of rig time.
  • Drilled 753 m of total footage at ROP of 24 m/h, setting record for section length and depth for 20-in casing drilling in Europe.
  • Delivered high-quality wellbore, resulting in an excellent cementing job.

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 Direct 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 TDDirect CD 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 Direct 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 TDDirect casing-while-drilling service achieved an ROP of 29 m/h, saving the operator 62 h of rig time.


Download: TDDirect Casing-While-Drilling Service and Direct XCD Casing Bit Save OMV Petrom 62 h (0.25 MB PDF)

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