Analysis of the Possibility of Blocking Fractures Near Injector Using a Suspension System

The problem of blocking technogenic fractures with a suspension mixture is relevant in order to prevent additional water inflow to producing wells. The aim of the work is to evaluate the effect of colmatation of a fracture by polymer-dispersed compositions using a mathematical model of transport of a suspension through a fracture. It is assumed that the suspension particles are larger than the size of the pore channels and do not penetrate into the reservoir. To solve the problem, a system of continuum mechanics equations is used. The leading edge of the suspension slug is a contact discontinuity. It is determined that at the moment of the approach of this discontinuity to the end of the fracture, a reflected wave of the volume fraction of particles is formed, which moves towards the flow and characterizes the blocking of the fracture. At the same time, due to the need to maintain the same flow rate and reduction of the size of the fracture, there is a sharp increase in the downhole pressure, which does not allow the fracture to be completely blocked. The maximum blocked fracture size is determined. The obtained estimates are compared with field data.