Abstract: Usually shale recovery ratio is about 10%-16% , which is far less than the conventional oil and gas reservoirs. Because the current international oil prices are in the doldrums and shale production declines fast, higher technical requirements are put forward for effective economic exploitation. Because of the geological and engineering factors such as the creep of rock, the imperfection of fracturing and the decrease of the conductivity of fracture, leading to the decrease of production, the repeated fracturing technique can realize the increase of production, and the cost is low and the effect is remarkable. According to the characteristics of shale, as large-scale, large delivery rate and large segment length, comparing the different refracturing techniques, the use of biodegradable temporary plugging material is convenient and with low cost, but the use of Eseal tools is more procedures and with high cost. Temporary plugging technology is that the target layer is perforated to refracture and establish the passage. When the particulate drops with 2. 3 kg per perforation usually are used to plug perforations firstly and the refracturing design is optimized, the well is perforated again and the bridge plugs / the particulate drops are used to refracture. Sealing pressure response is obvious. Eseal tools is that the coiled tubing with Eseal tool is used to enter the goal of the well to seal up the section of no productivity and reconstruct the integrity of the wellbore, then the well is perforated and fractured again. Shale refracturing technology has been successfully applied in vertical wells and horizontal wells in Marcellus, Haynesville, Barnett, Eagle, Ford and other blocks, and most of the wells have remarkable effects of increasing production, which has increased by more than 65% compared with the early days.

Key words:  , shale, refracturing, temporary plugging, Eseal, packer, standard 

摘要：

关键词:  , 页岩, 重复压裂, 暂堵, Eseal, 封隔器, 标准