20150369019 | METHOD FOR STABILIZING A CAVITY IN A WELL - A method for stabilizing a cavity at a production or injection zone in an underground well is described. The method includes providing a filtering element in the well at the cavity that is to be stabilized, the filtering element being formed with openings. The method further includes injecting a first fluid including expandable particles through the filtering element into the cavity, where the expandable particles in a non-expanded state have a diameter smaller than the diameter of the openings of the filtering element. The method further includes injecting a second fluid through the filtering element, the second fluid configured to react with the expandable particles such that the expandable particles expand to a diameter larger than the diameter of the openings in the filtering element, whereby the expanded particles and the filtering element form a filter at the production or injection zone in the well. | 12-24-2015 |