Method for maintaining the zonal isolation in a well subterru00c2neo having a hole, method for cementing a well subterru00c2neo having a hole, and the use of species catiu00e2nica bivalent in a cement paste bombu00c1vel

摘要

Method for maintaining the zonal isolation in a well subterru00c2neo having a hole, method for cementing a well subterru00c2neo having a hole, and the use of species catiu00e2nica bivalent in a cement paste bombeu00c1vel. A self-healing cement for use in wells, where diu00e1xido carbon is injected, stored or extracted, comprises an additive which reacts with carbon dioxide to form precipitates.In the event of a failure in the matrix of cement, or failure of adhesion between the cement / coating interface or interface cement / wall of well bore, the material reacts when contacted with carbon dioxide, and the precipitated from a seal the damaged regions.