SAP (sustained annular pressure) was observed in a exploration well in Persian Gulf. And during its abandonment, per-foration and cementing in the gas source layers was tried many times to kill the SAP, but no success is ever achieved. In this paper, the dual casing (?244.475 mm and ?339.725 mm) in the upper part of gas source layers was milled, and gas block cement plug was set in the milled section. It is verified by negative pressure test that cement plug can isolate the gas source layers effectively. Field application shows that multi-layer casing milling and cement plug technology can solve completely the SAP problem which cannot be dealt with by the conventional perforation and cementing technology.%中东波斯湾海域某探井出现环空带压,弃井期间多次尝试在气源层射孔挤注处理环空带压问题,未获成功.在气源层上部锻铣 ?244.475 mm与 ?339.725 mm双层套管,并在锻铣井段内注防气窜水泥塞,通过负压测试等证实了可以利用水泥塞实现对气源层的有效封隔.现场应用表明,环空带压井弃井作业中运用多层套管锻铣注水泥塞技术能够彻底解决射孔挤注难以处理的环空带压问题.
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