E. Papamichos et al., PERMEABILITY REDUCTION DUE TO GRAIN CRUSHING AROUND A PERFORATION, International journal of rock mechanics and mining sciences & geomechanics abstracts, 30(7), 1993, pp. 1223-1229
The permeability reduction around a perforation cavity is analyzed as
the result of grain crushing due to the perforation process. The poroe
lastic solution of a plane wave emanating from a cylindrical cavity is
used to derive expressions for the intergranular stresses responsible
for grain-crushing phenomena. These phenomena are examined on the bas
is of Herizian contact theory of fracture and micromechanical descript
ions of granular assemblies assisted by discrete element simulations.
Results are presented for hydrostatic loading conditions for compariso
n with existing experimental results, and for uniaxial strain conditio
ns as an approximation to the stress field around the perforation. The
analysis can be applied to the prediction of the extent of the permea
bility-reduced zone and used for estimating the permeability reduction
around the perforation.