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Overburden Drill Bit overburden drilling system 70mm - 400mm OD

Categories Down The Hole Drilling
Brand Name: ROSCHEN
Model Number: 70 mm - 400 mm
Certification: ISO
Place of Origin: GERMANY
MOQ: 1
Price: $60
Supply Ability: 300 pcs per month
Packaging Details: wooden box, carton
System: toughest overburden drilling system
Drilling: mitsubishi overburden drilling system
Manufacturer: overburden drilling Manufacturer
Item No: symmetrix drilling system
Casing: symmetrix casing system
China: China drilling system
Type: numa drilling system
Origin: China concentric drilling systems
Accessories: Overburden Drill Systems and Accessories
Drill Bit: Overburden Drill Bit overburden drilling
Company Info.
ROSCHEN GROUP
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    Overburden Drill Bit overburden drilling system 70mm - 400mm OD


    Overburden Drill Bit overburden drilling system 70mm - 400mm OD



    Details Description:


    The Stratex Drill System

    The Stratex Drill System (SDS) is an overburden drilling system designed for conditions where a cased hole is required. Collapsing holes tend to make overburden drilling expensive, with lost drilling equipment and down time.


    In cooperation with drillers and drilling contractors, the SDS was developed to overcome these problems. The patented eccentric design and the Drop Off Ring (DOR) drill bits enable the drill string and casing to be lowered in the hole simultaneously with a conventional hammer drilling system.


    The SDS eccentric designed bit rotates outward and drills a larger diameter hole than the casing, avoiding cave-ins, wash-outs, and other problems common in normal drilling operations in soft and gravel-type strata or loose rock. Since 90% of the world's overburden drilling is in loose strata, potential utilization of the SDS is enormous.


    After reaching the designated depth, the SDS reamer-bit is retracted by reversing the direction of the rotation and by applying tension on the reamer-bit, which has a taper and will retract into the casing for easy removal of the entire drill-string. This leaves the casing in place for other applications or for removal at a later date. The SDS method is designed for use with flush joint threaded pipe or welded-type casing and provides a bit size for a wide variety of different casing wall thicknesses.


    Advantages of SDS:


    Low capital investment

    High drilling performance

    No rotation of the casing

    Compatible with most drilling rigs

    Virtually no casing stress

    Casing is simultaneously lowered by the guide device and to deeper depths than other methods allow

    Cost and on-site time reduced due to better penetration rates, easier bit changes, and stable hole conditions

    Smaller pilot bit for faster and better penetration


    Applications:


    Blast holes

    Water supply wells

    Bridge and building foundations

    Standard slant or horizontal drilling

    Mining air holes

    Environmental monitoring wells

    Grouting operations

    Seismic shot holes

    Soil sample and geotechnical applications

    Ground anomaly and tiebacks

    Storage caverns and dam


    Accessories Available with SDS:


    Drop Off Ring (DOR)

    Drill pipe and subs

    Threaded casings

    Casing drive shoes

    Hydraulic casing pullers

    Stabilizers

    Discharge heads

    Casing wing-nuts

    Shock subs

    Drill bits

    Fishing tools

    Air swivels


    Overburden Drill System


    Assembly of the Stratex System


    The Stratex Drilling Method is used with air rotary drilling rigs and most manufacturers' downhole hammers. The drill rod is connected to the rig top drive using a changeover sub or swivel sub. The drill rod is then connected to the down-hole hammer by the same method. The chuck nut and split rings are removed to insert the guide device shank and secured by replacing the split rings and chuck nut.

    The reamer bit, in the closed position, is now inserted into the casing shoe. Since the percussion hammer is at the bottom of the hole, working directly above the drill bit, the force to pull down the casing tube is transferred by way of the casing shoe. The exhaust air from the drill redirects the loose cuttings up through the groves on the guide device, forcing them up between the drill rod and the casing wall out through the discharge head, which is attached to the casing tube. By using a discharge head, drilling is not only safer but also environmentally cleaner. Stratex can be used with foam or water to aid in cutting removal.


    Good Flushing


    Good Flushing is essential with any successful drilling operation or in using an overburden drilling system. The Stratex System provides air jets above and below the guide device, creating a vacuum across the face of the reamer bit, removing the cuttings with greater annular velocity. The gauge carbides along the side of the pilot and reamer bit act to crush the cuttings into finer particles, the majority of which are removed from the hole. The remaining cuttings are forced back into the walls of the cavity, leaving less material to be extracted from the hole.


    Advantages:

    • Efficient removal of cuttings from above the guide device, which prevents the hammer from jamming and torque problems
    • Removal of fine cuttings from around the bit system and casing creates less friction and achieves deeper depths and easier casing removal
    • Reduction in losses due to circulation problems by increased vacuum in cutting removal
    • For unique applications, the annular velocity can be increased by changing the airflow in the reamer pilot system

    1. One-piece reamer and pilot bit
    2. One-piece guide device and shank
    3. Casing with shoe sleeve
    4. Casing
    5. Wing-nut centralizing system
    6. Drill rod
    7. Casing adapter
    8. Discharge head
    9. Swivel sub


    Air velocity is important for efficient hole cleaning. A minimum return air velocity of 4000 feet per minute is desirable. Annular space between drill pipe and the drilled hole as well as compressor capacity determines the air velocity. The annular air velocity in foot per minute can be calculated with the following formula if air consumption and annular area are known:


    annular air velocity (fpm) =

    free air consumed (cfm) x 144


    annular area (sq. in.)*


    *annular area = .7854 x (hole diameter - drill pipe OD)

    The following flushing mediums are also useful:

    • Air with water injection
    • Air with foam injection

    NOTE: Foam has the ability to lift cuttings and stabilizes the wall of the hole and provides lubrication for easier casing penetration. Foam also has good drilling performance in most types of clay.



    The Stratex Drill System

    Drilling Rod


    Wiper Cover
    Wipers

    Discharge Body

    Discharge Clamp
    Adapter

    Blank Casing End

    Adapter Clamp

    Replaceable Grippers

    Pin End

    Box End

    Casing

    Hammer Shank

    Guide Device

    Casing Shoe

    Reamer Bit

    The Stratex System utilizes a one-piece reamer and pilot bit that moves outward to full open position on an eccentric shaft by rotating a half turn to the right.

    This reamer pilot bit system opens a larger diameter hole than the diameter of the casing. The casing is simultaneously lowered into the hole as the reamer pilot bit drills. The pilot bit is rotated at 10 to 40 rpm while drilling with the hammer.

    When the designated drilling depth is reached, the reamer pilot bit system is retracted into the casing by applying slight tension and reversing the direction of the drilling rotation. The design of the reamer pilot bit system incorporates a closed bearing method that makes the loss of the pilot bit virtually impossible. This bit system, in the closed position, is easily removed through the casing shoe and casing.

    Working
    Position

    Retracted
    Position

    Telescopic Drilling


    Using a telescoping drilling method can achieve deeper depths.

    Some string samples are as follows:

    365

    240

    190

    140

    90


    365

    215

    165

    115



    365

    215

    140

    90


    Casing depths with Stratex can reach 500 feet or more with the down-hole hammer versions depending on the type of formation, drilling equipment, and drilling personnel experience.


    Hole Depth


    Stratex System (mm)

    70

    80

    90

    115

    140

    165

    190

    215

    240

    365

    Normal Max - Hole Depth (ft)

    200

    250

    300

    500

    500

    500

    500

    -

    -

    -

    The Stratex Drilling Method

    The Ultimate Drilling Method

    The Overburden Drilling Method that was designed by drillers for drillers. Overburden material strikes when least expected. Be prepared. Use Stratex!

    The PATENTED Stratex Drill System:


    1. One-piece shank and guide device manufactured from the highest quality material with stringent quality control.

    2. Air jets are used to prevent any malfunction of the opening and retraction of the reamer pilot bit operation and the clearing of cuttings above the reamer pilot bit system.

    3. Sealed bearing system for ease in rotating the eccentric bit outward or retracting it into the casing.

    4. Casing with shoe: Casing may be supplied with plain or threaded ends.

    5. Grooved bypass directly above the lock system to clear cuttings and ensure complete drilling face contact.

    6. Tapered shoulder on the reamer bit eliminates casing binding and assists in the retracting of the reamer bit into the casing.

    7. One-piece reamer and pilot bit manufactured from the highest quality material, with stringent quality control.

    8. Gauge protection carbides on heavy duty, one-piece pilot and reamer bit.

    9. Dome carbides on heavy duty pilot and reamer bit.


    The ROSCHEN

    DROP-OFF RING UNDER REAMER

    Used when concentric drilling is a requirement:

    • High performance drilling
    • One-piece reamer
    • One-piece guide device
    • Made from tough heat-treated alloy steel
    • Studded with an aggressive array of tungsten carbide inserts
    • Lower drilling costs per foot
    • Guaranteed performance*
    • Guaranteed service
    • Large range of accessories
    • Manufactured under strict quality-controlled conditions

    *When used in conjunction with manufacturer's recommendations and specifications.


    Drop-Off Ring Under Reamer

    Tool
    Size

    Casing
    OD (IN)
    a

    Nominal
    Casing Size
    (IN)

    Casing
    Wall

    Casing
    Show i/d
    b

    Hole
    Dia.
    c

    70 mm

    3.5

    3.0

    .216

    2.75

    3.75

    80 mm

    4.0

    3.5

    .266

    3.125

    4.875

    90 mm

    4.5

    4.0

    .237

    3.625

    5.0

    115 mm

    5.563

    5.0

    .258

    4.5

    6.125

    140 mm

    6.625

    6.0

    .280

    5.5

    7.5

    165 mm

    7.625

    7.0

    .301

    6.5

    8.75

    190 mm

    8.625

    8.0

    .322

    7.5

    9.75

    210 mm

    9.625

    9.0

    .342

    8.350

    11.0

    215 mm

    10.0

    9.5

    .350

    8.625

    11.125

    240 mm

    10.75

    10.0

    .365

    9.525

    11.25



    TOOLS OF EXCELLENCE AND DURABILITY FOR OVER 30 YEARS

    Recommended Maximum Air Pressure for Stratex Drill Systems

    The maximum recommended air pressure for Stratex drilling with down-hole hammers is 12 bar, which equals 210 psi.

    Rotation speed depends on the size of the Stratex bit and the formation being drilled. The rotation speed may have to be varied as the formation changes. The table shows recommended rotation speeds for the various Stratex sizes.


    Recommended Rotation Speeds

    Stratex System (mm)

    70

    80

    90

    115

    140

    165

    190

    215

    240

    280

    Speed (rpm)

    20 - 40

    10 - 25

    Drill rigs must have sufficient torque for drilling with Stratex. The table shows recommended rotation speeds for the various Stratex bit sizes.

    Hole Depth

    Stratex System (mm)

    70

    80

    90

    115

    140

    165

    190

    215

    240

    280

    Minimum Torque (ft/lb)

    570

    600

    663

    1470

    2200

    2950

    4000

    4000

    4000

    7000

    "ROSCHEN provides the widest range of flexibility when it comes to casing wall size
    thickness, which makes it a high demand by users. All systems complete and ready for
    resale within a week or two, a time frame that cannot be met by other manufacturers."


    Stratex Over Burden Drilling Tool: Size and Technical Chart

    Tool Size

    Casing Sizes

    Drive Shoe I.D.
    (B)

    Drive Shoe Length
    (C)

    Guide to Casing Distance
    (D)

    Reamed Diameter
    (E)

    Bit
    Size
    (F)

    Guide to Casing Distance
    (D)

    Nominal Size

    O.D.
    (A)

    Walls
    (S)

    70

    3

    3.50

    .216

    2.750

    2.5

    4.25

    3.75

    2.75

    2.968

    80

    3.5

    4.0

    .237

    3.156

    2.75

    4.5

    4.375

    3

    3.437

    90

    4

    4.5

    .247

    3.650

    3.5

    5

    5

    3.5

    3.937

    110

    5

    5.562

    .375

    4.375

    5.5

    7.50

    6.125

    4.25

    4.75

    115

    5

    5.562

    .258

    4.575

    5.5

    7.50

    6.125

    4.25

    4.937

    132

    6

    6.625

    .432

    5.188

    5

    7.75

    7.5

    4.875

    5.593

    140

    6

    6.625

    .280

    5.575

    5

    7.75

    7.5

    5.125

    5.937

    142

    7

    7

    .498

    5.575

    Product Tags:

    drill pipes

      

    dth hammers and bits

      
    Quality Overburden Drill Bit overburden drilling system 70mm - 400mm OD for sale
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