Schlumberger

Case Study: LUKOIL Reduces Section Construction Time by 80% with Direct XCD Drillable Alloy Casing Bit

Advanced bit design enables operator to land 9 5/8-in casing to TD in 4 days compared with 20 days in previous well

Challenge: Improve well construction time and cost efficiency while drilling in an unstable shale formation.

Solution: Run the Direct XCD drillable alloy casing bit as part of a casing drilling strategy.

Result:

  • Reamed and cased to 2,671-m [8,763-ft] TD in one run.
  • Reduced well construction time by 16 days compared with a nearby offset well.
  • Eliminated a dedicated drillout run.
  • Improved wellbore stability by plastering cuttings into the borehole wall.

Improve operational efficiency in Bayandyskoye field

With unstable, swelling shale and high concentrations of hydrogen sulfide and carbon dioxide, the Bayandyskoye field presents a challenging drilling environment to operators. LUKOIL recently reamed and cased one well in 20 days. However, with a focus on continuous improvement, the operator sought to reduce well construction time even further by implementing new technologies that could streamline operations.

Use drillable alloy casing bit to drill to TD in one run

To improve operational efficiency and address wellbore stability issues, Schlumberger recommended the Direct XCD drillable alloy casing bit—a PDC bit specially made for drilling and casing challenging vertical wells to TD in one run—modeled in the IDEAS integrated dynamic design and analysis platform. The bit drills on standard casing that is rotated at the surface, enabling casing-while-drilling operations.

Drilling with casing reduces annulus size and plasters cuttings into the borehole wall, producing a stronger borehole for cementing. Multilobe torque rings increase torque capacity while protecting threads from debris, eliminating the need for additional downhole equipment.

Reduced well construction time by 16 days

Using the Direct XCD bit, LUKOIL reamed and cased to 2,671-m [8,763-ft] TD in just 4 days—reducing well construction time by 16 days and setting a new field record. Once the bit reached TD, it served as the casing shoe, enabling LUKOIL to drill through the bit and eliminating the need for a dedicated drillout run.



Download: LUKOIL Reduces Section Construction Time by 80% with Direct XCD Drillable Alloy Casing Bit (0.17 MB PDF)

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