Case Study

Performance Alert

NEw Zealand operator saved 2 days drilling the 9 1/2-in hole section with d-tech rst675 compard to using conventional motor bha

  • THE CHALLENGE

    • An operator needed to drill the 9 ½-in. section of a well in the Tarinaki Basin in New Zealand.
    • The well plan consisted of completing a 26.2° tangent section with a dropoff to vertical, with a 3.0°/30m DLS using a rotary steerable tool.
    • Previously, this challenging section was drilled using a motor assembly.
    • They experienced hole cleaning issues because of the amount of time it was taking to slide, which required extensive cleanup cycles to mitigate.

  • THE SOLUTION

    • The customer worked with D-Tech Rotary Steerable to determine the best solution to complete the section.
    • The D-Tech team in Bristol designed and manufactured a bespoke 9 ½-in. RST675 tool to drill the section.
    • The modified tool was run in a motorized BHA, allowing the section to be drilled with up to 120 surface RPM and 290 bit RPM, ensuring optimum hole cleaning.

  • THE BENEFIT

    • The D-Tech Rotary Steerable Tool allowed the customer to complete the well without resorting to time-consuming conventional methods and delivered a far less tortuous well path.
    • By utilizing the RST BHA, the drillstring was constantly rotating, resulting in improved hole cleaning and shorter cleanup cycles.
    • Overall, the operator saved two days drilling the section compared to using a conventional motor BHA.

Details

Location

New Zealand

Formation

Tarinaki Basin

Hole Size

9½-in. hole section

avg controlled dls

3.0°/30m

drilling results

  • 120 surface RPM, 290 bit RPM
  • 92 drilling hrs
  • Average ROP of 22.4 m/hr
  • Total D&C hrs of 126


benefit

Overall time saving of 2 days compared to conventional BHA

92 drilling hrs, average ROP of 22.4 m/hr, and a total D&C hrs of 126


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