Overburden drilling pipes and accessories (OD eccentrics)
Apageo offers a complete range of casing systems, from conventional Odex systems manufactured in our factories to specific systems from partners specialising in this dedicated drilling technique.
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Advance-casing systems are the method of choice in heterogeneous soils when drilling with drilling mud or fluids does not provide adequate wall stability. This technique is therefore ideal, particularly in alluvial soils, gravel sections, etc. Depending on your needs, we offer various advance-casing drilling systems along with all their accessories:
STAREX
The STAREX® is a advance-casing system that allows for simultaneous drilling and casing installation in heterogeneous formations. The entire tool consists of a guide, a reamer, and a cutter. It enables drilling a hole wider than the diameter of the casing. The casing is thus driven (without rotation) and follows the advance of the cutter at the bottom of the hole. At the desired depth, reverse rotation allows the eccentric tool to be retracted, thereby pulling up the inner string and the tool while leaving the casing in place. Drilling can also continue within the available diameter at the base of the casing.
STAREX® 76 and 90 series pipes are designed for off-hole casing. For down-the-hole hammer drilling, Series 90 to 240 should be used.
A complete STAREX® set consists of a discharge head, a shoe pipe, a set of threaded casings, a finned coupling, a STAREX® tool, a down-the-hole hammer, a drill string, a casing removal head and a coupling.
STAR
The STAR is an off-hole roto-percussion casing system, based on exactly the same principle as the STAREX® 76 and 90 series off-hole. The particular advantage of this system is that it offers different drilling diameters from conventional and can use standard casings: Metric 67x74 and 104x113 or NW.
CONCENTRIX
The Concentrix tool, developed by one of our partners Sysbohr, is offered to you to improve and facilitate advancing casing systems with a hydraulic out-of-hole hammer or down-the-hole hammer. When the Concentrix is pushed by the inner string, it exits the casing and expands directly to its maximum diameter, which is larger than the outer diameter of the pipe.
When pulled, the Concentrix automatically retracts to its minimum diameter to fit into the casing without difficulty. It can then be easily removed and the borehole left cased. This avoids the sometimes complicated operation of the usual eccentric tools that have to be extended and retracted by rotation. Both parts of the Concentrix face can be replaced, thus avoiding the need to replace the entire tool.
OVERBURDEN system
In addition to conventional casing systems, we offer specialized Sysbohr systems. Perfectly suited for high-powered foundation drills, these systems enable extremely fast cased drilling under all conditions, regardless of the machine’s configuration (single or dual-head, hydraulic hammer or vibro-head, etc.). These systems include a set of casings, often rotary-percussion type (OD), and/or special threads, notably the patented PFS thread, which offers significantly higher resistance to high torque and tensile forces. Several techniques can be used for cased drilling in various diameters—whether standard or custom—that differ from standard dimensions in order to effectively meet all job site requirements.
Rotary-Odex system
This system involves driving the casing and the inner string together using a special 3-thread rotary head. The diameter of the tool (often a tricone bit) is perfectly matched to the inside diameter of the casing to prevent cuttings from entering the pipes. And as with other systems, once the desired casing depth is reached, the drill string can be rigged or, if necessary, continue drilling through the installed casing.