After large-scale volume fracturing of deep shale gas "wells

there comes the difficulty of wellbore plugging

which affects long-term production.The common methods to remove the wellbore plugging by coiled tubing and drill pipe are simple.It lacks of the pertinence measures to treat the diameter shaft and the mixed stemming.For example

Well-WY23-1HF can not produce normally due to the fracturing of adjacent well.The formation collapses and the cuttings enter the wellbore

causing serious plugging.The trajectory of its plugging section is of the complex situation of warped

casing deformation and so on.The measures of plugging removal and resuming production are drill-grinding string

drill-grinding process

well killing fluid design

etc.The field application shows that the same type of bridge plug should be used to reduce the impact of tapering

ensure the smooth trajectory

prevent the accumulation of plugging material

and avoid the complication of wellbore conditions for multi-stage fracturing of horizontal wells.At the same time

combined with the comprehensive application of soluble bridge plug and large diameter noneasy-to-drill bridge plug

the combination of pipe string with oil flushing with nibs+drill pipe with bit（or milling shoe） is adopted to remove plug

and the recovery of production is successfully achieved.This technology provides a reference for similar shale gas wells.