Particle transport in vertical fractures has always been assumed to be controlled by particle settling. Recently, comments have appeared in the literature that suggest that segregation by convection may be more important in a class of fractures where the perforation height is small relative to the fracture height Unfortunately, this proposition has not been substantiated with experimental data or other observations.

In order to test the concept two small slot flow models have been constructed that allow the visualization of flow from a point source into a fracture. To be classified as a point source the height of the fracture must be large relative to the height of the perforations. The models can be used over a wide range of entrance and fracture shear rates. One of the models represents a parallel-sided, uniform fracture while the other contains a non-uniformity below the fluid entrance. Little is known about the effect of non-uniformities on fracture flow especially with non-Newtonian fluids.

You can access this article if you purchase or spend a download.