Eccentric Overburden Drilling System

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
1. As soon as the drilling starts, the reamer opens and enlarges the hole to drive the casing shoe and casing tube down.
2. 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.
3. The casing tube can be left in the hole, or can be pulled out by means of grout sealing material.
4. Use the normal drilling tools to drill and achieve the desired depth.

  • Three Piece Eccentric Overburden Drilling System
  • Two Piece Eccentric Overburden Drilling System

Three Piece Eccentric Overburden Drilling System

A E C D Drill pipe
System No. Outer Dia. Thickness
Range
Reamed Dia. Min. Inner Dia. of Casing Shoe Hammer Type Drill Pipe
Range
KE85 108mm
(4.25")
9-15mm
(0.35")-(0.59")
118mm
(4.65")
86mm
(3.4")
DHD3.5, COP32, COP34 76mm
(3")
KE90 114mm
(4.5")
11-13mm
(0.43")-(0.51")
127mm
(5")
91mm
(3.6")
DHD 3.5, COP32
COP34
76mm
(3")
KE102 127mm
(5")
11mm-13mm
(0.43")-(0.51")
136mm
(5.35")
101mm
(3.97")
DHD 3.5, COP32
COP34
76mm
(3")
KE115 140mm
(5.5")
13mm-16mm
(0.51")-(0.63")
152mm
(5.98")
117mm
(4.6")
DHD340, QL 40
SD-4
76mm
(3")
KE115A 146mm
(5.75")
14mm-19mm
(0.55")-(0.75")
154mm
(6")
117mm
(4.6")
DHD340,
QL 40, SD-4
COP 42/44
76mm
(3")
KE140 168mm
(6.6")
13mm-19mm
(0.51")-(0.75")
184mm
(7.25")
140mm
(5.5")
DHD350, QL50 / SD-5
COP52/54
76mm-89mm
(3")-(3.5")
KE150 178mm
(7")
13mm-19mm
(0.51")-(0.75")
194mm
(7.63")
150mm
(5.90")
DHD350, QL50 / SD-5 76mm-89mm
(3")-(3.5")
KE165 193mm
(7.6")
13mm-20mm
(0.51")-(0.78")
206mm
(8.11")
16 5mm
(6.5")
DHD360, QL60 / SD-6 89mm-114mm
(3.5")-(4.5")
KE190 219mm
(16.5")
13mm-20mm
(0.51")-(0.78")
234mm
(9.21")
193mm
(7.6")
DHD360
QL60, SD-6
89mm-114mm
(3.5")-(4.5")
KE210 245mm
(9.64")
14mm-21mm
(0.55")-(0.85")
260mm
(10.25")
210mm
(8.25")
DHD360/380,
QL 60/80
SD-6/SD-8
114mm
(4.5")
KE240 273mm
(10.75")
16mm-22mm
(0.63")-(0.83")
300mm
(11.8")
24 0mm
(9.5")
DHD380, QL80
SD-8
114mm-127mm
(4.5")-(5")

Two Piece Eccentric Overburden Drilling System

A E C D
System No. Outer Dia. Thickness Reamed Dia. Min. Inner Dia. of Casing Shoe Hammer Type Drill Pipe
K188 178 mm
(7")
13 mm - 19 mm
(0.51")– (0.75")
188 mm
(7.4")
144 mm
(5.7")
DHD350
QL 50, SD-5,
COP52/54
76mm- 89mm
(3") - (3.5")
K240 219 mm
(8.62")
12 mm- 15mm
(0.47")-(0.59")
240 mm
(9.45")
192 mm
(7.5")
DHD360, QL 60,
SD-6,
114 mm
(4.5")
K305 273 mm
(10.75")
16 mm-20mm
(0.63")-(0.78")
305 mm
(12")
238 mm
(9.4")
DHD380,
QL 80, SD-8
114mm - 127mm (4.5") - (5")
K360 323mm
(12.7")
20 mm - 24 mm
(0.78") - (0.94")
360 mm
(14.17")
284 mm
(11.8")
DHD380,
QL 8, SD-8/10
127 mm
(5")
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