Schlumberger

Case Study: Vankorneft Increases ROP 12%, Completes 1,194-m Sidetrack in Single Run, Eastern Siberia

PowerDrive X6 rotary steerable system and optimized drill bit enable improved well trajectory and dogleg severity in high-angle well

Challenge: Improve well trajectory and dogleg severity (DLS) while maintaining high ROP on two sidetracks drilled in the same well on separate runs.

Solution: Drill the sidetrack using the PowerDrive X6 rotary steerable system (RSS) and use the IDEAS integrated drillbit design platform to customize a Smith PDC drill bit.

Result:

  • Increased average ROP per section by 12%.
  • Drilled a 1,194-m sidetrack well in one run.
  • Increased DLS to 5°/30 m, a 40% improvement over the original BHA.

    Improve angle buildup and well trajectory

    Vankorneft drilled liner sections across 28 wells in an eastern Siberia field, including five sidetrack wells, two of which were drilled in the same well on separate runs. Several of the sections began facing angle buildup and well trajectory issues. The 6-in directional PDC bits that were being used did not provide the intensity required to meet the zenith of the angle buildup.

    Develop a fit-for-purpose drill bit

    Schlumberger collaborated with Vankorneft to optimize the operation. The push-the-bit PowerDrive X6 RSS was recommended to provide full directional control while rotating the drillstring for increased dogleg capability in challenging environments. Engineers from Smith Bits, a Schlumberger company, used the IDEAS platform to identify the optimal placement of the managed depth of cut (MDOC) feature—used to stabilize torque while limiting cut penetration—because improper placement can lead to reduced DLS. Determining which cutters required the MDOC feature increased tool face control and contributed to higher DLS with the PowerDrive X6 RSS combination. Custom-purpose bits were developed, field tested, and implemented to maintain the maximum RSS inclination of 2.5°/30 m to 5°/30 m when drilling the sections.

    Achieved drilling objectives, increased ROP

    Using the recommended solution, Vankorneft increased its average ROP per section by 12% when comparing rates before and after the change in BHA. The 1,194-m sidetrack well was drilled in a single run using the new PDC drill bit design. The optimized BHA also increased DLS to 5°/30 m, a 40% improvement over the original configuration.


    Download: Vankorneft Increases ROP 12%, Completes 1,194-m Sidetrack in Single Run, Eastern Siberia (0.22 MB PDF)

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Push-the-Bit System for Full Directional Control

PowerDrive X6 RSS
Designed for full directional control while rotating the drillstring, PowerDrive X6 RSS minimizes the effect of external drilling environment factors, improving focus on performance and reliability.
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