Casing System (Overburden Drilling System)

Casing System (Overburden Drilling System)
Casing System (Overburden Drilling System)
Casing System (Overburden Drilling System)
Casing System (Overburden Drilling System)
Casing System (Overburden Drilling System)
Casing System (Overburden Drilling System)
Casing System (Overburden Drilling System)
Casing System (Overburden Drilling System)
Casing System (Overburden Drilling System)
Casing System (Overburden Drilling System)
Casing System (Overburden Drilling System)
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Casing drilling, or casing while drilling (CwD) process, is a concept that combining two time-consuming processes, drilling and casing together, performing them at the same time. During the CwD process, powered by DTH hammer, a central piloting bit drives a ring bit to drill a hole wide enough for a casing tube to slide down, drilling and casing processes are therefore performed at the same time.

Features
  • Complete types of drilling tools suitable for casing tubes with various diameters;
  • Good stability and reliability granted by premium alloy steel material and fine CNC manufacturing process;
  • Cost-effectiveness realized by mass production.
Applications

Water well drilling, geothermal well drilling, foundation piling, geological prospecting, etc.


Permanent
  • When start drilling, the central bit drives the ring set to drill a hole wide enough for casing tube to slide down.
  • When arriving the bedrock, reverse rotation of the tools and pull out the central bit from the hole, leaving ring set in the hole.
  • Pour concrete and proceed to the next steps

Retrievable
  • When start drilling, the central bit drives the ring set to drill a hole wide enough for casing tube to slide down.
  • When arriving the bedrock, reverse rotation of the drill string and pull out the central bit from the hole.
  • Pull the casing tube out with the ring set while pouring concrete.
Technical Parameter Table of Standard Symmetric Casing System With Reamer for DTH hammer (Rectangle Lock)
Order Guide: A B C D E
A B C D E
Outer Dia. Of Max. Wall Outer Dia. Of Inner Dia. Of Ring Bit Max. Dia. of Suitable
Casing Tube Thickness Ring Bit (mm) Pilot Bit hammer
(mm) (mm) (mm) (mm) (inches)
114 8 126 87 85 3.5"
127 10 138 95 94 3.5"
139.7 5 160 116.5 115 4"
152.4 5.5 170 126 124 5"
168.3 5.5 190 142 140 5"
177.8 7 200 153.5 152 6"
193.7 5.5 220 167 165 6"
219.1 6.5 246 190.5 188 6"
273 8 303 240 238 8"
323.9 10 350 282 280 10"
406 12.7 442 350 345 12"
508 12.7 545 450 445 18"
560 12.7 595 500 495 18"
610 12.7 645 550 545 18"
Industries We Serve

Our rock drilling equipment can be applied in various industries, doing rock drilling and crushing duties for digging, blasting, etc.
We mainly offer 4 series of rock drilling tools: top hammer drilling tools, down-the-hole (DTH) drilling tools, self-drilling anchor system and drag bits.

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