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Low temperature epoxy system for through tubing squeeze in profile modification, remedial cementing, and casing repair
Low temperature epoxy system for through tubing squeeze in profile modification, remedial cementing, and casing repair
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机译:低温环氧系统,用于通过油管挤压进行轮廓修改,固井固井和套管修复
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摘要
A method for zone isolation, profile modification, remedial cementing, or replacing a damaged or corroded casing with a solid plastic is described. A solidifiable epoxy resin mixture, containing a critical amount of a hardener and curing agent for improved pumpability, is placed into a wellbore so as to bind with undamaged casing and close off any thief zones. Subsequently, the epoxy resin mixture forms a hardened solid underwater and/or at low wellbore temperatures that is able to withstand downhole stresses. The hardened solid is milled out if necessary so as to form a resinous casing the size of the original casing. Later, the hardened resinous casing is perforated to communicate with a targeted zone. Perforation is not required when isolating a zone. The hardened solid is of a strength sufficient to withstand stresses generated during EOR operations such as carbon dioxide or steam-flooding. Said solid is also resistant to workover acids and other chemicals used in EOR operations.
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