NeoSteer CL Curve and Lateral At-Bit Steerable System | Schlumberger

NeoSteer CL

Curve and lateral at-bit steerable system

Gets to TD quicker by avoiding the postcurve trip
Drill the curve and lateral sections with one BHA
Provides increased reservoir exposure
Attain a high build rate with effective geosteering
Delivers a high-quality wellbore
Streamline completion with straight laterals

The NeoSteer CL ABSS enables operators to drill curve and lateral sections in a single run.

The NeoSteer CL curve and lateral at-bit steerable system (ABSS) is specifically designed to enable drilling the curve and lateral in a single run. It lets you achieve high build rates and extend lateral lengths in US land unconventional drilling applications. Especially where vertical, curve, and lateral sections are the same hole size, the NeoSteer CL ABSS reduces NPT by eliminating the need to change out the BHA for every section.

The NeoSteer CL ABSS uses an actuating system to push against the borehole wall for propulsion; the pistons are placed next to the cutting structure for greater curvature leverage. The NeoSteer CL ABSS uses this leverage to achieve higher build rates with no additional application of hydraulic force. This provides the ability to meet both the build requirements in the curve section and the directional control requirements in the lateral section.

The NeoSteer CL ABSS unit incorporates metal-to-metal hydraulic seals that reduce erosion and increase hydraulic design capability for improved performance. In addition, the steering technology can be equipped with XPC extreme-profile single shoulder connections to increase reliability during high-dogleg severity drilling. These connectors also enable compatibility with Smith Bits PDC Blade Family bits equipped with the proper unique cutting elements for formation-specific challenges. The NeoSteer CL ABSS and customizable bits work in concert to provide single-run drilling with greater drilling efficiency.

Six-axis continuous inclination and azimuth measurements and automatic trajectory control for accurate well placement in shale and unconventional wells

The NeoSteer CL ABSS includes comprehensive six-axis continuous inclination and azimuth measurements. The multiaxial component enables automatic hold inclination and azimuth (HIA) measurements for precise well positioning. This feature, along with self-steering capabilities, helps provide smooth tangents with minimized tortuosity. Near-bit extended-range gamma ray measurements provide additional well positioning data for improved real-time decision making.

Azimuthal image gamma ray for improved steering in the curve and lateral sections

The NeoSteer CL ABSS can be configured with an onboard azimuthal image gamma ray cartridge to improve in-zone percentage and enable steering within the reservoir sweet spot. With an azimuthal gamma ray cartridge just 6 ft behind the cutting structure, the ABSS can identify signs of changing lithology earlier to enact instant steering corrections.

Cutout photo of the NeoSteer CL at-bit rotary steerable system

Applications

  • Pad and batch drilling operations
  • Horizontal wells with long lateral sections
  • Wells requiring high build rates and dogleg severity (DLS)
  • Unconventional wells

Benefits

  • Enables single-run drilling of vertical, curve, and lateral sections with a single BHA
  • Achieves high build rates and long lateral length requirements
  • Increases leverage of force applied to bit by placing pistons with the cutting structure
  • Improves control and reaction time

Features

  • Application-specific Smith Bits PDC bit design
  • Nonmagnetic steering unit body
  • Dual hydraulically activated pistons
  • Inclination and azimuth closed loops to provide advanced automated tangent control
  • Proprietary high-endurance-strength connector
  • Near-bit measurements including
    • Inclination
    • Azimuthal
    • Gamma ray
    • Azimuthal gamma ray
    • High-definition (HD) surveying
Maximum temperature: 302 degF [150 degC]
Maximum hydrostatic pressure: 20,000 psi [138 MPa]
Maximum rotational speed: 350 rpm
Nominal OD (API): 6.75 in
Simplified side-view illustration of the core components of a NeoSteer CL at-bit rotary steerable system BHA
A
Cutting structure
B
Pistons push against the wellbore wall to steer. They are very close to the bit, which gives it better leverage to execute sharper turns
C
Inclination sensor enables automatic hold inclination
D
Multiaxial component enables automatic hold inclination and azimuth measurements for precise well positioning and helps provide smooth tangents with minimized tortuosity
E
Azimuthal gamma ray cartridge is located just 6 ft behind the cutting structure, enabling operators to proactively identify signs of changing lithology and enact instant steering corrections
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