StingBlade Bits Save More Than 5 Days in the Browse Basin, Offshore Australia | SLB
Case Study
Location
Australia, Oceania, Offshore
Details

Challenge: Drill 12 1/4-in vertical section through formation known to induce excessive damage on conventional PDC bits, causing short footage runs and low ROPs.

Solution: Use StingBlade conical diamond element bits to drill through interbedded hard limestone with high chert content; place Stinger conical diamond elements across the bit face using the IDEAS integrated drillbit design platform to ensure maximum durability for longer runs with high sustained ROP.

Results: 

  • Increased footage by 97% and ROP by 57% compared with bits in the same section of an offset well.
  • Saved more than 5 days by drilling the interval to TD.
Products Used

StingBlade Bits Save More Than 5 Days in the Browse Basin, Offshore Australia

Conical diamond element bits increase footage by 97%, ROP by 57%

Challenging section adds time and cost to the well

An operator planned to drill a 12 1/4-in vertical section in the Browse basin offshore Australia through the challenging Dampier, Heywood, Baudin Marl, and Wollaston Formations. These formations are composed of interbedded hard limestones and chert with high compressive strengths, which induce heavy damage to conventional PDC bits. Such damage slows ROP and requires the operator to pull bits prematurely, requiring more time to drill the section.

StingBlade bits optimize drilling performance

To improve bit durability and ROP, Smith Bits, a Schlumberger company, recommended using StingBlade bits. Engineers used the IDEAS platform to determine the optimal placement of Stinger elements across the bit face. The Stinger elements’ 3D conical shape is designed to fail high-compressive-strength rock with a concentrated point load. The elements also have a thicker diamond layer for maximum strength and durability. This enables StingBlade bits to drill farther through formations that typically cause impact damage to PDC bits while also sustaining higher ROP throughout the run.

Images - The StingBlade bit extends run length at high drilling speed.
The StingBlade bit extends run length at high drilling speed.

Improved ROP saves more than 5 days

The first StingBlade bit drilled 1,516 m at 11 m/h, equaling 97% more footage than the best run in the same section of the offset well. ROP also improved by 57% in this run. The second StingBlade bit drilled the remaining section to TD at an average ROP of 16 m/h. Altogether, the two StingBlade bits helped the operator save more than 5 days of drilling time.

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Drilling the 1,516-m interval at 11-m/h ROP and the remaining section at 16-m/h ROP enabled the operator to save 5 days of drilling time.
Products Used

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