SELF ADAPTIVE CEMENT SYSTEMS

摘要

A self-healing cement system includes cement, water and at least one additiv e that swells in contact with water from reservoir or from formation in the ca se of a structural failure in the set cement to provide a physical barrier in t he zone of failure. Examples of such material include particles of super- absorbent polymer. These additives have the effect of making the cement self~healing in the event of physical failure or damage such as micro-annuli . The self healing property is produced by the contact of the water itself, th e potential repair mechanism is thus activated if and when needed in case of start of loss of zonal isolation. Several super-absorbent polymers have been identified such as polyacrylamide, modified crosslinked poly(meth)acrylate a nd non-solute acrylic polymers.