Nigeria | D-Tech Rotary Steerable

Case Study

Performance Alert

D-Tech RST & Segofs Energy Services Sets Record, Achieving Directional Requirements and Overcoming Flow-Rate Limitations/Unstable Hole Conditions

THE CHALLENGE
- Nigerian Petroleum Development Company (NPDC), the national oil company in Nigeria, needed a reliable and robust rotary steerable system to drill a challenging 12 ¼-in. hole section.
- Based on offset wells, they were anticipating multiple drilling problems on the Oredo-20 development well, including poor hole cleaning, possibility of stuck pipe, and lost circulation.
- There was also the potential for flow-rate constraints due to rig pump and pressure limitations.
THE SOLUTION
- After consulting with the operator and Segofs Energy Services, the D-Tech Rotary Steerable team recommended its RST900 configuration based on an expected flow-rate of 775 to 800 gpm.
- While drilling, the actual flow-rate range was 700 to 750 gpm. Even with this limitation, the RST met all directional requirements and maintained inclination when required.
- Throughout the run, the RST accumulated more than 154 drilling and circulating hours.
THE BENEFIT
- The 6,116-ft section was delivered in one run, making it the longest RST run for NPDC.
- The RST completed 92.31 drilling hours, with an average ROP of 66.25 ft/hr and allowed the depth of the section to be extended, which permitted conventional drilling in the 8 ½-in. section.
- Because the run was successful, the operator didn’t have to use more time-consuming conventional methods and was provided with a far-less tortuous well path.

Details

Location

Nigeria

Formation

Oredo-20 development well

Hole Size

Challenging 12 ¼-in. hole section

flow rate

700 to 750 gpm

footage drilled

6,116-ft in one run

benefit

Longest RST run for NPDC

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