Project Full Name：Research and Field Application of Wide Fracture Fracturing Technology in Changqing Tight Oil Reservoir

Company：Oil and Gas Technology Research Institute of Changqing Oilfield Branch of CNPC

Awarded：Exploration & Production Technology

Standard:  International  Advanced Level

Project Number：ECF-2024-SEP-1001

Principal Accomplishers： Lu Hongjun, Yan Changhao, Bai Xiaohu, Li Xiangping, Chang Du, Yu Jinzhu, Feng Fei, Wang Fei, Xue Chunqi, Su Liangyin, Li Jianhui, Cao Yujie

Key Innovation Points：

In response to the challenge of fully utilizing tight and thick oil reservoirs vertically, an innovativetechn ical concept of "wide firacture fracturing" has been proposed, which involves multiple rounds ofintermittent fracturing, inter stage blowoff circulation injection, stepped increase in displacementdiscontinuous sand addition, and temporary blocking and turning throughout the process. The stress"loading unloading loading" cycle forces a significant increase in net pressure inside the rock fractures.increases the width of the main fractures, opens lateral microcracks, improves the connectivity of thematrix pore throats, and ultimately achieves the goal of effectively improving the three-dimensional sweptvolume of fractures, the complexity index of fracture networks, and the flow conductivity inside thefractures.

Main Application and Technical Principal： 

In response to the challenge of fully utilizing tight and thick oil reservoirs vertically, an innovativetechn ical concept of "wide fracture fracturing" has been proposed, which involves multiple rounds ofintermittent fracturing, inter stage blowoffcirculation injection, stepped increase in displacement,discontinuous sand add ition, and temporary blocking and turning throughout the process. The stress"loading unloading loading" cycle forces a significant increase in net pressure inside the rock fractures,increases the width of the main fractures, opens lateral microcracks, improves the connectivity of thematrix pore throats, and ultimately achieves the goal of effectively improving the three-dimensional sweptvolume of fractures, the complexity index of fracture networks, and the flow conductivity inside thefractures.

Technology Application： 

The technological innovation results formed by the project can realize the full utilization of reserves in dense and thick oil reservoirs vertically, greatly improve the oil recovery rate and recovery rate, revitalize the low-grade resources of the old oil fields that have been proved, make the old oil fields rejuvenated for the  second time, and provide a good technical reference for further improving the overall development effect of ultra-low-permeability oil reservoirs.