ClearPath^® Eccentric Reamer

Suitable for Vertical, Deviated, and Extended Reach Wells

The ClearPath eccentric reamer is designed to improve drilling efficiency by removing sections of parallel misalignment, keyseats, micro doglegs and assisting in scouring and displacing cutting beds that can lead to swabbing and pack-off issues.

The ClearPath eccentric reamer achieves this through the optimized placement of a low-torque helical hybrid cutting structure, combined with a flow accelerator and drill cuttings agitator.

To enhance overall drilling efficiency, we have developed a hybrid multifunctional wellbore conditioning system. This system ensures a smoother wellbore through a unique two-stage reamer, drilling fluid accelerator, and cutting bed agitator — all integrated into a single-piece design.

Benefits

• Increases drift size
• Eliminates the need for dedicated wiper trips
• Removes horizontal section misalignment, ledges, keyseats, and micro doglegs
• Eases tripping and subsequent casing running
• Reams out spiral patterns
• Reduces stick and slip
• Increases energy transfer to the bit and reduced drill string drag
• Improves weight transfer to the bit
• Helps extend bit and motor life
• Shortens trip times
• Reduces risk of stuck pipe
• Reduces risk of packing off
• Reduces torque and drag in drilling mode
• Improves control of ECD (Equivalent Circulating Density)
• Creates cleaner and more stable wellbore conditions

Multifunctional Drilling Technology

The ClearPath eccentric reamer is an innovative multifunctional tool combining reaming, drilling, wellbore conditioning, improved stabilization, and hole cleaning capabilities.

Features

• One-piece Construction

  The ClearPath eccentric reamer is manufactured from a single piece of steel. The steel used has mechanical properties which are compatible with other drill string components connecting to the eccentric reamer.

• Eccentric Blade Design, Opposing Eccentric Ream Blades

  The first and second reamer blade sets are angularly displaced about the longitudinal tool axis by 180° on the drill string. Circumferentially opposing dual drift blades which are hard banded and are positioned to dynamically stabilize the cutting structure whilst reaming. This offset reamer blade arrangement marginally enlarges the wellbore diameter, ensuring the bit can pass through without the need for back reaming.

• Progressive low-torque helical hybrid cutting structure > 2-stage wellbore conditioning

  Each eccentric reaming blade surface has deep helical grooves running up the blade, with PDC cutters and dome-shaped inserts located in the center tooth bed. The cutting structure cuts into the doglegs, and cuttings are pulled up the flute by the rotation of the tool and into the longitudinal blade flow by-pass area.

• Minimize vibration > Multi-point stabilization

  The first set of reamer blades contains the active cutting structure, and hence does most of the borehole enlarging, while the second set of blades further condition. The stabilizer blades positioned circumferentially at 180° on the drift side dynamically stabilize the tool during rotational reaming.

• Improved hole cleaning

  The middle section, between the lower and upper reamer blades, contains design features which increase the velocity and impel cutting beds. These features work in tandem as the tool translates in a counter rotation, agitating the cutting beds on the lower side of the wellbore up into the circulating drilling fluid where they are transported up the annulus. The additional bearing pressure and increase in annular velocity combined with stabilizer blade pad geometry leads to a smoother filter cake whilst minimizing the risk of packing off during drilling operations.

• Enhanced cutting transportation > Hydrodynamically positioned inner blades

  As the reamer translates in a counter rotation downhole, as drilling fluid and suspended cuttings and cavings flow past the agitator blades located between the first and second reamer blade set. In doing so, the geometry of the agitator blade elements increases the velocity of the drilling fluid, thus creating turbulence in the mid-tool annulus, and a cleaning effect on the wellbore wall due to bearing pressure created against the wall of the wellbore.

ClearPath Eccentric Reamer Specifications

Dome Hybrid Reamer^®

Passive Reamer Design

Ream when you need to, not because you can. The Dome hybrid reamer, a stabilizer while drilling, a reamer when you need one. This innovative design has a similar profile to the FixedBlade stabilizer but offers an overall longer blade length to support a unique three-stage taper with different cutter types. The 3-stage taper is created to ensure a gradual cutting action starting at 14 degrees at the bottom, 5 degrees in the middle, and 2 degrees as a transition zone to the hardfacing.

The pin-side has numerous TCIs spread out over the 3-stages with flat PDC cutters positioned near the hardfacing for extra protection. The box-side is set up similarly but also integrates different stud PDC cutters for extra backreaming capabilities.

The Dome hybrid reamer is the ideal tool to position as the top stabilizer for extra protection for the BHA, ensure backreaming capabilities, without intervening with any weight on bit or torque issues.

Benefits

• Passive design with minimum to no interference while drilling
• Reduces back reaming and the risk of stuck pipe events
• Smooth running of casing to TD
• Flexible Configuration (uni- or bi-directional)
• Hydrodynamic profile
• Elongate micro doglegs and borehole spiral patterns
• Improved weight transfer and torque compared to conventional reamers

Unique Innovative Solution

Passive reaming capability up-and-down

Features

• Unique 3-stage trapper

  The 3-stage taper is created to ensure a gradual cutting action starting at 14 degrees at the bottom, 5 degrees in the middle, and 2 degrees as a transition zone to the hardfacing.

Dome Hybrid Reamer Specifications

FixedBlade^® Reamer

Active Reamer Design

The FixedBlade reamer is engineered to achieve optimal borehole gauge while effectively minimizing wellbore imperfections, including borehole tortuosity. This is achieved through the controlled elongation of micro doglegs and borehole spiral patterns during the drilling process.

To maximize its efficiency, the FixedBlade reamer should be positioned high-up in the drill string and operated under tension.

Benefits

• Enhanced weight transfer and wellbore conditions
• Reduced need for dedicated wiper trips
• Decreased back reaming and reduced stuck pipe risk
• Mitigate Balling-up and downhole ECD/Swab and Surge effects
• Eliminate ledges and pinch points

Unique Innovative Solution

Bi-directional reaming capabilities

Features

• Optimized hydrodynamics

  The FixedBlade reamer boasts an advanced design featuring optimized hydrodynamics, enabling enhanced transportation of cuttings surrounding the stabilizers.

• Forward-and back-reaming

  The cutter configuration allows for forward and back-reaming capabilities.

FixedBlade Reamer Specifications

Dome inserts made of Tungsten Carbide and Passive Polycrystalline diamond inserts are utilized Different gauge sizes can be provided upon request.