Abstract: Due to the unfavorable factors of initial stimulation treatment in shale gas horizontal wells, the output is less than expected, coupled with the current downturn in the oil price background, shale gas horizontal wells refracturing technology is increasingly concerned about the development of shale gas resources. With the continuous development of fracturing technology, many shale gas fields have now successfully implemented this technique to increase production rate and to enhance ultimate gas recovery from shale gas wells. Overviewed the procedure for candidate well identification and discussed the key fracturing techniques and operation monitoring techniques. Lastly, based on the current situation of the development of different techniques, the direction of the refracturing technique of shale gas horizontal wells were prospected. Some suggestions were put forward, such as selecting wells with "big data" technology, flexible restoration of casing damaged and deformed wells, fracture monitoring based on damage mechanics, and fracturing fluid and proppant with new materials. As China is abundant in potential shale gas reserve, to accelerate the formation of supporting technology suitable for shale gas horizontal wells refracturing in China can play a role in promoting the commercial development of shale gas in China in the future.

Key words: shale gas horizontal well, refracturing, candidate well identification, fracturing technology, operation monitoring