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Symmetric Drilling System

ROSCHEN Symmetric Casing Drilling System is designed to drill holes of many sizes, ranging from 108 to 863mm (4 1/4 to 34 in), at any angle (including horizontal), to any depth (beyond 100 meters) through unconsolidated formations simultaneously with casing.

Quantity:
  • 3 1/32 ~30 27/32
  • ROSCHEN
  • ROS-SYM-(NO.)

Product Description

 Symmetric drilling system 


Retrievable symmetric drilling system by DTH hammer is designed to drill and case a hole simultaneously through unstable ground conditions. The driver rock drill bits incorporated with a satisfactory ring or reusable ring makes a full face head design which significantly improves the penetration rate and hole straightness of drilling. The internal flushing grooves together with the built-in casing shoes gives a good seal to the button of the drilling hole, minimizing the disruption of the drill hole's surrounding.

 


 sysmmetric drilling system


Casing Tube OD  Ring   Bit OD  Min.   Casing Shoe ID  Pilot   Bit Diameter  Hammer Shank Style 
mm  inch  mm  inch  mm  inch  mm  inch 
108~127  4 1/4 ~   5  118~134  4 5/8 ~   5 1/4  78~101  3 1/16 ~   4  77~92  3 1/32 ~  DHD3.5,   Cop34, Mission 30 
3 5/8
140~146  5   1/2 ~  150 ~156  5   27/64 ~  94~117  3   45/64 ~  105~124  4   1/8 ~  DHD340A,   SD4, QL40, Mission40 
5 3/4 6   1/8 4   5/8 4   57/64
168~178  6 5/8 ~   7  178~195  7 ~ 7   5/8  121~150  4 3/4 ~   5 7/8  125~156  4   59/64 ~  DHD350R, SD5, QL50, Mission50 
6  9/64 
194~219  7   5/8 ~  203~234  8 ~ 9   1/4  148~190  5   5/8 ~  150~203  5 7/8 ~   8  DHD360,   SD6, QL60, Mission60 
8 5/8 7   1/2
219~325  8   5/8 ~  235~348  9   1/4 ~  190~284  7   1/2 ~  165~306  6   1/2 ~  DHD380,   QL80, SD8, Mission 80 
12 3/4 13   11/16 11    3/16  12    3/64 
244~406  9 5/8   ~16  273~440  10   3/4 ~  210~364  8   1/4 ~  190~340  7   1/2 ~  SD10,   Numa100 
17  5/16  14    5/16  13   25/64
406~558  16 ~ 22  419~590  16   1/2 ~  328~514  12   27/32 ~  340~440  13   25/64 ~  SD12,   DHD112, Numa120, Numa125 
23 1/4 20   1/4 17   3/8
508~762  20 ~ 30  526 ~798  20   45/64 ~  412~716  16   1/4 ~  470~685  18   1/2 ~  SUP205 
31  7/16  28    3/16  26   31/32
609~762  24 ~ 30  637~798  25   ~  513~716  20   3/16 ~  540~685  21   1/4 ~  SUP245 
31  7/16  28    3/16  26   31/32
863 34 900 35    7/16  815 32    3/32  785 30   27/32 SUP325 


Symmetric Casing Drilling System Features and Advantages:

  1. 1)      Stable and reliable working performance

  2. 2)      Full face head design for faster penetration and straighter hole

  3. 3)      Less torque is required than eccentric drilling

  4. 4)      Can drill in vertical, horizontal or any direction

  5. 5)      Minimize disruption to the drilled hole

  6. 6)      Effective cuttings removal

  7. 7)      Unlocking-relocking easily

  8. 8)      Easy to operate and system security

  9. 9)      Varied ring bit diameters to suit different casing requirement

  10. 10)   The less vibration of drill rig

Symmetric Casing Drilling System is designed to drill holes of many sizes, ranging from 108 to 863mm (4 1/4 to 34 in), at any angle (including horizontal), to any depth (beyond 100 meters) through unconsolidated formations simultaneously with casing. The internal flushing grooves together with the built-in casing shoes gives a good seal to the button of the drilling hole, and thus minimizing the disruption of the surrounding of the drill hole. It makes the casing follow easy and the equipment and operation simple, and is recommended to a multitude of applications, such as micro-piling, underpinning, anchoring, marine work and horizontal drilling etc.. 



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