ONGC Saves 36 Days Drilling Time in Offshore India | Schlumberger
Case Study
Location
India, Asia, Offshore
Details

ONGC used an AxeBlade ridged diamond element bit enhanced with Stinger conical diamond elements on an optimized rotary BHA to drill a 12 1/4-in section of hard, abrasive basaltic formation in the Deccan Trap.

Products Used

ONGC Saves 36 Days Drilling Time in Offshore India

Conventional PDC and roller cone bits resulted in damaged bits and NPT; AxeBlade ridged diamond element bits reduced cost per meter by 40%

ONGC Saves 36 Days Drilling Time in Offshore India
This DBOS drillbit optimization system report reveals the challenge while drilling overcome by the AxeBlade bit optimized for these conditions. Abrasion, impact, and uncompressive strength all substantially increased with depth.
ONGC Saves 36 Days Drilling Time in Offshore India

ONGC’s concerns

ONGC wanted to increase ROP, improve cost efficiency, and avoid bit damage and NPT while drilling through interbedded weathered and basaltic formations.

What they tried first

The challenging application caused premature impact damage to conventional roller cone and PDC bits in the offset well. Junk recovery runs increased NPT, and unstable bit and BHA configurations caused high shock and vibration, increasing drilling time and costs. Drilling the section to TD required nine to 15 roller cone bits at an average ROP of 0.5 to 1 m/h and an average meterage between 60 and 100 m.

What Schlumberger recommended

Combined with two stabilizers in the BHA configuration, a new design of 16-mm hybrid AxeBlade bits with Stinger elements created for the application would improve stability compared to baseline configurations used in offset wells.

ONGC Saves 36 Days Drilling Time in Offshore India
XZ816 Hybrid AxeBlade ridged diamond element bit with Stinger conical diamond elements.

What was achieved

Using the hybrid AxeBlade bit enhanced with Stinger elements on an optimized rotary BHA, ONGC drilled 952 m at an average ROP of 1.9 m/h. A second bit drilled 960 m at an average ROP of 1.83 m/h. Both bits completed the 12¼-in section in the same formation that required 15 bit trips to drill in an offset well. ONGC met the objectives of the run, as the hybrid bit lowered the cost per meter of the section. The customer saved nearly 36 offshore rig days, improved ROP compared to the offset average, and achieved nine times improvement in meters per bit. The run resulted in a 40% reduction in cost per meter. 

Products Used

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