The SYMMETRIX Drilling Method

SYMMETRIX equipment enables you to drill and case deep holes simultaneously in all types of formation, which drills straight holes, in any type of ground conditions, at any angle and to depths
beyond 100 meters. The Symmetrix drilling system are made up of a central pilot bit, a casing shoe and a symmetrical ring bit, casing diameters from 114mm (Symmetrix 114) to 610mm (Symmetrix 610) can be used in our products range.

A central pilot bit that drills away the center part of the hole and guides the drill string. The pilot bit is attached to any common DTH hammer shank or top hammer rod thread.

A casing shoe welded to the casing pipe which is pulled down by the impact of the hammer and pilot bit.

A symmetrical ring bit that is locked onto the pilot bit drills the void for the casing to advance down the

hole. There are two different types of ring bit and casing shoe assemblies. One is a welding ring that holds the ring bit and casing shoe together, the other one is an assembled ring bit set with integrated ring bit and casing shoe together, this integrated ring bit set is most popular design.

Casings are installed into the overburden basically for two different reasons, one is to create a conduit through the overburden for example gas, oil, water and geothermal wells, utility lines, starter casings for exploration, grouting casings etc; the other purpose is to create foundation and support structures such as piles, forepoling, pipe roofs, ground stabilization, anchors etc. Depending on the use of the casing it is either left in the hole permanently or retrieved by pulling out. Symmetrix range includes systems for drilling both permanent and retrievable casings. In case of the permanent casing the ring bit is sacrifced and left in the bottom of the hole, while drilling retrievable casings all system components are retrieved for re-use.