At-bit Rotary Steerable System (RSS) | Schlumberger

PowerDrive xCL

At-bit rotary 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
Make completion easy and effective with straight laterals and smooth wellbore walls

The PowerDrive xCL RSS enables northeast US operators to drill both the curve and lateral in a single run.

The PowerDrive xCL at-bit rotary steerable system is specifically designed for the Appalachian Basin 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 PowerDrive xCL RSS reduces NPT by eliminating the need to change out the BHA for every section. 

The PowerDrive xCL RSS uses piston technology to push against the borehole wall for propulsion; the pistons are placed next to the cutting structure for greater curvature leverage. The PowerDrive xCL RSS 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 PowerDrive xCL RSS steering unit incorporates metal-to-metal hydraulic seals which reduce erosion and increase hydraulic design capability for improved performance. In addition, the RSS can be adapted with XPC extreme-profile single shoulder connections to increase reliability during high-dogleg severity drilling in the Appalachian Basin. These connectors also enable compatibility with Smith Bits PDC bits equipped with the proper unique cutting elements for the basin’s formation-specific challenges. The PowerDrive xCL RSS and customizable bits work in concert to provide single-run drilling with greater drilling efficiency. 

Multiaxis measurements and automatic trajectory control for accurate well placement in shale and unconventional wells

The PowerDrive xCL RSS includes comprehensive six-axis continuous inclination and azimuth measurements. The multiaxial component enables automatic hold inclination and azimuth 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 PowerDrive xCL RSS 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, operators can identify signs of changing lithology earlier to enact instant steering corrections.

Cutout photo of the short PowerDrive xCL at-bit rotary steerable system mated with an AxeBlade bit

Applications

  • Appalachian Basin
  • 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 while meeting 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
    • 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 PowerDrive xCL at-bit rotary steerable system BHA
A
Cutting structure
B
Pistons push against the wellbore wall to steer. They're 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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