Schlumberger

Case Study: AxeBlade Bit Increases ROP 29% and Improves Directional Control in Eagle Ford Shale Interval

Ridged diamond element bit improves drilling rates while enhancing steerability with reduced reactive torque

Challenge: Achieve high instantaneous ROP and enhance toolface control while drilling with a high differential pressure motor in limestone and shale formations, Eagle Ford Shale.

Solution: Deploy the AxeBlade ridged diamond element bit to drill the curve and lateral intervals.

Result:

  • Drilled 3,586-ft [1,093-m] interval in 35 hours for an ROP of 102.5 ft/h [31.2 m/h], an improvement of 29% compared with previous wells.
  • Held toolface, built angle, and reduced reactive torque compared with baseline bits.
  • Showed better dull condition compared with offset runs.

Enhance ROP while maintaining toolface control

An operator in the Eagle Ford Shale of Texas designed a well where the curve and lateral intervals would be drilling through limestone and shale formations with unconfined compressive strengths between 6,000 psi [41.4 MPa] and 15,000 psi [103.4 MPa]. The curve consisted of limestone and shale interbeds, which can cause issues with toolface control when sliding through the transitions.

The operator sought to drill the interval using a single BHA with high differential pressure motors, ranging from 500 to 1,200 psi [3.4 to 8.3 MPa] of differential pressure. The ideal drill bit would deliver high penetration rates and enhanced toolface control while withstanding high differential pressure.

Customize AxeBlade bit to meet objectives

Schlumberger suggested the AxeBlade ridged diamond element bit to achieve the desired performance. The ridged diamond element combines the shearing action of a conventional PDC cutter with the crushing action of a tungsten carbide insert (TCI) to cut rock more efficiently. The cutters’ unique geometry delivers higher instantaneous ROP, reduces overall torque, creates less reactive torque fluctuation, and improves toolface control.

The IDEAS integrated drillbit design platform was used to simulate the directional response of a formation transition in the curve section. The AxeBlade bit showed less overall torque and held toolface angle through the shale and carbonate transition better than the offset bit.

Better toolface control and 29% faster ROP

Using the AxeBlade bit, the operator drilled 3,586 ft in 35 hours for an ROP of 102.5 ft/h— an improvement of 29% compared with the performance achieved in two offset wells on the same pad. Additionally, the bit successfully landed the well with enhanced toolface control and resulted in a better dull condition compared with the offset runs.


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Improved Drilling Rates with Enhanced Steerablity

AxeBlade Bit Increases ROP 29% and Improves Directional Control in Eagle Ford Shale Interval
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Instant ROP Improvement from One Advanced Bit

AxeBlade Ridged Diamond Element Bit
Field tests of the AxeBlade bit have demonstrated up to 29% improvement in ROP compared with similar bit designs using conventional PDC cutters, saving significant rig time and drilling costs. Visit AxeBlade Ridged Diamond Element Bit page