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Symmetric Overburden Drilling System

Type: Permanent / Retrievable
Casing range: 4" to 16"

  • SOD108 to SOD406
  • SOLLROC
  • SC-SYMMETRIC
Quantity:

Product Description

Symmetric Drilling System is designed to drill and case a hole simultaneously through unstable ground conditions. The pilot bit incorporated with a sacrificial 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 bottom of the drilling hole, and thus minimising the disruption of the surrounding of the drill hole.


SOLLROC symmetric system features:

Straight Holes and fast Penetration Rate.

Less Torque in all ground conditions.

Easy System to lock and Unlock Ring.

Drilling at any angle required.

Wear-resistance and longevity.



symmetric

Casing OD Reamed diameter Inner diameter of casing shoe Max. Inner dia. Of casing shoe   that pilot bit can pass through Hammer Part number
(A) (C) (D)
mm inch mm inch mm inch mm inch

108 4 1/4 118 4.646 85 3.346 75 2.953 3" SOD108A-3-75
114.3 4 1/2 128 5.039 90 3.543 80 3.15 3" SOD114A-3-80
139.7 5 1/2 154 6.062 108 4.252 95 3.74 4" SOD140A-4-95
168.3 6 5/8 182 7.165 138 5.466 125 4.921 5" SOD168A-5-125
177.8 7 192 7.559 148 5.827 135 5.315 5" SOD178A-5-135
193.7 7 5/8 210 8.268 164 6.457 148 5.827 6" SOD194A-6-148
219.1 8 5/8 235 9.252 184 7.244 172 6.772 6" SOD219A-6-172
273 10 3/4 305 12.008 238 9.37 219 8.622 8" SOD273A-8-219
323.9 12 3/4" 348 13.701 294 11.575 265 10.433 10" SOD324A-10-270
406 16" 432 17.008 358 14.094 330 12.992 12" SOD406A-12-330

Permanent  / retrievable type are available.    

Order guide: Outer Dia.of casing pipe (A) + Wall thickness + reamed Dia. (C) + Inner Dia. Of casing shoe (D) + hammer type


Call Us :
+86 731- 85551632
No.55 Jiucaiyuan, Wenyi road, Furong District, 410001, Changsha, Hunan, China

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