Abstract: Hydraulic re-fracturing treatment technology is a signifi-cant topic for old producers. After analysising production char-acteristics of the low-permeability reservoir with high water-cut period, this paper put forward a new re-fracturing tech-nology, i.e. re-fracturing for forming new fractures while
blocking old ones. At first, the technique principle and corre-sponding treatment method of the hydraulic re-fracturing are systematically described. Then, a new blocking agent, which is used to re- fracturing treatment and met the corresponding properties needs, is studied and developed. The new treatment technology was performed in Changqing Oilfield, and a very re-
markable success was made. These results demonstrate it is pos-sible for hydraulic re-fracturing to create new fractures in di-rections different from initial ones.

Key words: fracture, re - fracturing, blocking agent, High Water cut, production, Changqing oilfield