Eccentric Casing System

Maxdrill’s eccentric casing system is designed to effectively transmit the percussive force produced by DTH drilling tools into the rock and thus drills a hole in fissure or complex formations. A casing tube in the system helps prevent borehole collapse. The eccentric casing system features high drilling efficiency, quality holes, easy operation and low requirements of accessories. Choose Maxdrill’s eccentric casing system and you will handle complex formations drilling easily.

Eccentric Drilling System
Three Piece Eccentric Overburden Drilling System

Three Piece Eccentric Overburden Drilling System

Maxdrill’s eccentric casing system is designed to effectively transmit the percussive force produced by DTH drilling tools into the rock and thus drills a hole in fissure or complex formations. A casing tube in the system helps prevent borehole collapse. The eccentric casing system features high drilling efficiency, quality holes, easy operation and low requirements of accessories. Choose Maxdrill’s eccentric casing system and you will handle complex formations drilling easily.

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Three Piece Eccentric Overburden Drilling System
Model O.D of Casing Tube(mm) I.D of Casing Tube (mm) Wall Thickness of Casing Tube (mm) Guide device max .Dia. (mm) Reamed Dia.(mm) Min I.D of Casing Shoe(mm) O.D of Normal bit (mm) Hammer Type Weight (kg)
MDEC108/7 108 94 7 92 117 86 85 COP34/DHD3.5 11.6/12.2
MDEC114/6.5 114 101 6.5 99 125 92 90 COP34/DHD3.5 13.4/14
MDEC127/9 127 109 9 107 138 100 98 COP34/DHD3.5 15.2/15.9
MDEC146/10 146 126 10 123.5 155 117 115 COP44/DHD340 /SD4/QL40 25/27.9
MDEC168/10 168 148 10 146 180 138 136 COP54/DHD350 /SD5/QL50 38/42
MDEC178/10 178 158 10 156 192 147 145 COP54/DHD350 /SD5/QL50 44.1
MDEC183/10 183 163 10 161 196 153 151 COP64/DHD360 /SD6/QL60 56
MDEC194/10 194 174 10 172 206 162 160 COP64/DHD360 /SD6/QL60 61.7
MDEC219/10 219 199 10 196 234 187 185 COP64/DHD360 /SD6/QL60 75.1
MDEC245/10 245 225 10 222 263 210 208 COP84/DHD380 /SD8/QL80 113.3
MDEC273/10 273 253 10 251 305 241 240 COP64/DHD360 /SD6/QL60 137.2
MDEC325/12.5 325 300 12.5 298 350 282 280 DHD112/DHD380 209.5/225.5
Application Range

The eccentric overburden drilling system is suitable for drilling water wells, geothermal wells, micro piles, and medium mini-type grouting holes in buildings, dams and harbor projects.

Design Principles

The casing makes the drilling system easy to follow and operate.

Outstanding Advantages:
Simple structure, easy operation, reliable quality, retrievable drilling tools, and long service life.

Operation Procedure
  • As soon as the drilling starts, the reamer opens and enlarges the hole to drive the casing shoe and casing tube down.
  • When drilling in over-burden formation is complete, start reverse circulation in order to close the reamer. Then pull up the assembly through the casing tube.
  • The casing tube can be left in the hole, or can be pulled out by means of grout sealing material.
  • Use the normal drilling tools to drill and achieve the desired depth.

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Related Products
As a reliable drilling tools manufacturer with a focus on supplying “Energy-saving, Economical, Efficient” products all along, we gradually become one of the most credible Chinese manufacturers in rock drilling tools industry. Maxdrill is always committed to supplying low cost, high efficiency, energy saving and environment-friendly products for global customers. No matter what types of rocks — soft rock, loose-medium rock, hard rock and any other special formations, just tell us what you need and leave the rest to us, and our customer service is always there to help you meet your requirements.

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