Self-adaptive cements

摘要

A self-adaptive cement formulation includes cement, water, block copolymer and asphaltite-mineral particles. The set cement demonstrates self-healing properties when exposed to methane, and is particularly suited for well-cementing applications. After placement and curing, the self-healing properties help maintain zonal isolation should bonding be disrupted between the set cement and the formation or a casing string, should cracks or defects appear in the set-cement matrix, or both.

主权项

1. A composition comprising a settable material, at least particles of an asphaltite mineral, styrene-isoprene-styrene block copolymer particles and sufficient water to form a pumpable cement slurry.