| 摘要 |
Agent and method for establishing different types of zone sealings particularly in oil wells and gas wells, wherein the zone to be sealed is supplied with a composition comprising: monomers, an initiator for heat- induced production of free radicals, a pot life extending inhibitor for stabilization of free radicals, and optionally other additives. The composition is subjected to radical polymerization induced by heat in the we ll zone and at a temperature of 5-120 ~C, and establishes a cured mass, particularly at temperatures in the range of 65-100 ~C. The composition is supplied with an at least partly unsaturated prepolymer selected from the group consisting of polyester and epoxy vinylester, including one or more vinyl-containing co-monomers selected from the group consisting of styrene, vinyltoluene, 2-hydroxyethyl-methacrylate and 2-hydroxypropyl-methacrylate. The prepolymer is present in a quantity of 15-75 weight parts and the vinyl- containing co-monomers are added in a quantity of 75-15 weight parts. The composition is particularly suited for low temperature applications.
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