Water jet perforator for uranium leaching wells.
1st Conference on Uranium Min Tech Reno Nev 1977 Apr; :1-36
This report describes a newly developed water jet cutting device specifically designed to perforate the side wall of cemented polyvinyl chloride (pvc) cased uranium leaching wells. These perforations have the property, if they are properly sized, of permitting the influx of solutions into the well bore while blocking an ingress of sand. Sand must not be permitted to enter the well bore because it drastically accelerates the wear of the downhole submersible centrifugal pumps used to lift the leachant to the surface. Present practice in the uranium industry is to place well screens adjacent to the mineralized zone after either cementing the well to the top of the mineralized zone with the aid of cement baskets or underreaming to remove the grouted casing in the mineralized zone. This well screen permits only sand-free liquid to flow into the well bore. The use of water jet perforation would obviate the expense and time required to place the well screens, set the cementing baskets, or underream the casing. This technique has the additional advantage that perforations can be placed exactly in the spot where the ingress of solutions is required. This property can be advantageously applied in those areas that have multiple zones of mineralization.
OP; Conference/Symposia Proceedings
1st Conference on Uranium Min. Tech., Reno, Nevada, Apr. 24-29, 1977; Uranium Mining Technology