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Need to perforate the well casing while in the ground? Look no further, here is a simple answer.
The air perforator effectively perforates installed steel or PVC casing. The steel casing perforating wheel punctures rows of approximately 1/10″ x 1″ slots in wall thicknesses up to 0.450″. The PVC casing perforating wheel punctures rows of approx. 0.050″ x 0.400″. The perforating wheels are easily changed out for replacement or switching between steel and PVC casing.
How a Perforator works
Designed for use with rotary drills, the perforator threads onto a standard drill string. Either through knowledge of water depth, or watching the cuttings for tell¬tale signs (like water, gravel, or sand), the perforator can be lowered to the exact depth of the aquifer.
Applying a small amount of air pressure (90 PSI. any CFM) the perforator cutting wheel extends and bites into the casing wall. As the rig pushes the perforator down the casing pulls the cutter out fully (after 6″ of travel) and the perforator starts punching holes in the casing that are about 1″ long x 0.25″ wide and spaced about 1 .5″ apart.
After quickly perforating a column, the drill string is returned to the starting location, air is turned off to retract the cutter. Then the string is rotated to start the next column of perforations. Good practice is to put a column in about every 4-5 inches around the casing diameter – about 4 or 5 columns for 6″ casing.
Casing Cutter
- This internal casing cutter cuts below or above ground. Standard unit cuts 6″ casing, and by adding simple adapters can cut 8″, 10″, and 12″ casing.
- Easy blade replacement.
- Works like a small external pipe cutter, but from the inside out. The cutting wheel penetrates deeper with each revolution.
- Approximately 100 revolutions needed for .250″ wall 6″ casing, which takes about 60-90 seconds.
- Easy operation by lowering the unit to the desired depth. Begin rotating clockwise while increasing air pressure to 150-200 psi.
- Continue rotating after cut is complete until all air pressure is bled off, otherwise you will break the blade during removal.
Our Extractor Hammers do exactly that. Get that stuck drill string back out of the hole.
The Medium Extractor Hammer (pictured at left) is a pneumatic hammer. The outer sleeve of the extractor is a reciprocating weight that weighs 200 lbs. It cycles fast like a down hole hammer and has a 4 1/2″ API thread at each end. With subs, it can be fastened to the top head drive or kelley of any rig. The sub on the bottom is fastened to the drill rod, casing, or whatever you want to pull.
While the Extractor Hammer is hammering up, the operator can pull up or push down, twisting simultaneously, if desired; normally you need only to pull. The Extractor Hammer has a 4 1/2″ regular box on the bottom.
The Extractor Hammer package includes two subs of the following choices: 3 1/2 API pin up or pin down or 2 7/8 IF pin up or down (with a 6″ pull plug).
Other accessories are threaded casing adapters and the heavy duty hinge that allows the casing or drill pipe to be pulled out away from the rig as the top head is lowered back down.
