Gefco currently builds several models of flooded-reverse rotary drilling rigs, table drive reverse rigs, and top-head
drive reverse rigs.
They also build several top-head drive rotary rigs, that can modified
with optional dual-wall reverse capabilities.
Current GEFCo models designed for flooded reverse rotary drilling include:
*22-RT-RC, which is a conventional Model 22-RT but with an added "Flooded
Reverse" Kelly, Reverse Swivel, and a 6" Discharge hose. Some Optionsinclude an optional 6x5 Centrifugal
pump, and an optional 500 CFM x 200 PSI Screw Air Compressor, choice of threaded drill pipe for Inside air, or flange
pipe outside air set-up.
* 22-HD-RC, a 2015 GEFCo
design that was built to upgrade the older JED-A design. The 22-HD-RC has a very wide mast, a hydraulic powered four-speed
18" retracting rotary table, the kelly hoist, pipe hoist, and sandline hoist are all hydrostatically powered
* 40-T, is a 3-axle Trailer mounted Large Flooded Reverse rig. A simple yet powerful machine.
Gefco still sells many parts for our older Failing Jed-A and Jed-B, Failing
Holemaster 2000, 2500, 3000, and 3500 Table drive rigs.
Even some items for the Speedstar-Franks
SS-RC reverse rig.
MOre to be added later.
The Big-Hole Top-Head drive unit can be used for flooded
reverse drilling in some cases.
Some form of Dual-Wall
Reverse system can be used on practically any GEFco tophead drive rig.
In the future, I hope
to make this a very usefull page for those interested in reverse drilling, with specific data on rig specifications, airlift
requirements, bit submergence, pipe data, bit data, etc.