关键词: 裂缝储层, 井漏, 常规重浆吊灌起钻, 全程带压起钻, “ 控压起钻 + 重浆帽”

Abstract: For the fractured reservoirs, the conventional tripout with heavy mud grouting can cause the downhole pressure fluctuation, which will lead to heavy loss and kick. Stripping can keep the downhole pressure to be balanced by reducing the swabbing pressure, but stripping equipment need to be used which might increase the operational risk. The “ stripping plus heavy mud cap” tripping technology combines the advantages of the conventional heavy mud grouting tripping and the snubbing, can reduce the downhole pressure fluctuation and avoid use of the stripping /snubbing equipment. This article introduces “ stripping plus heavy mud cap” tripping procedures briefly, focusing on the key points like the amount of heavy mud, the heavy mud spotting location and the design of heavy mud. Application indicates that the “ stripping plus heavy mud cap” tripping technology is more convenient, safer, lesser losses than the conventional tripping, which is the most safe and effective method for tripping at the present.