LAUSR

Abstract This work aims to evaluate a new loss of circulation control mechanism combining a smart fluid based on a mixture of a cross-linkable polymer (PVA) solution and magnetic microparticles. This new technology joins the benefits from magnetorheological fluids and cross-linked polymer gels. Magnetorheological fluids (MRF) containing iron particles in different sizes and concentrations were tested as carriers for the cross-linkable polymer. An empirical model with two parameters was also built to formulate MRF compositions able to have a yield stress that minimizes the fluid loss into reservoir. The results showed that MRF rheological properties could be fine-tuned by manipulating the diameter of the iron particles and particle fractions. Different cross-linkers were tested, chromium (III) acetate was the most adequate for PVA crosslinking reaction carried out in the presence of iron particles and under magnetic field. The results demonstrated that a mixture of magnetic particles and cross-linkable polymers has potential application for loss of circulation control.