There are three types of casing leakage including top casing leakage, extension hanger leakage and sidetracking casing leakage/outside sidetracking casing channeling.

• 侧钻井套管漏失可分为上部套管漏失、尾管顶悬挂器处漏失、小套管漏失或管外窜3种类型。