Well casing shoe structure

Claim 1

A WELL TOOL COMPRISING A GENERALLY TUBULAR HOUSING, MEANS FOR CONNECTING SAID HOUSING TO CONDUIT MEANS, A LAYER OF MATRIX MATERIAL CIRCUMFERENTIALLY ENCIRCLING THE INNER PERIPHERY OF AT LEAST A PORTION OF SAID HOUSING, A CIRCUMFERENTIALLY ENCIRCLING LAYER OF PARTICULATE MATERIAL PARTIALLY EMBEDDED WITHIN AND BONDED TO SAID MATRIX MATERIAL, AND A MASS OF CEMENTITIOUS MATERIAL DISPOSED RADIALLY INWARDLY OF SAID HOUSING WITH SAID PARTICULATE MATERIAL BEING PARTIALLY EMBEDDED THEREIN, SAID MASS OF CEMENTITIOUS MATERIAL BEING INTERLOCKED WITH SAID THUS EMBEDDED PARTICULATE MATERIAL ENTIRELY AROUND AT LEAST A PORTION OF THE OUTER PERIPHERY OF SAID MASS FACING SAID HOUSING, AND SAID LAYER OF PARTICULATE MATERIAL COMPRISING A PLURALITY OF SUBSTANTIALLY CONTIGUOUS PARTICLES, WITH A SUBSTANTIAL NUMBER OF SAID PARTICLES HAVING PORTIONS, EMBEDDED AND INTERLOCKED WITHIN SAID CEMENTITIOUS MASS, WHICH PORTIONS ARE ENLARGED AWAY FROM SAID MATRIX MATERIAL LAYER.