关键词: 水力压裂, 人工裂缝, 网络裂缝, 改造体积, 页岩

Abstract:

In this paper，by combining the practice shale reservoir volume stimulation with microseism fracture monitoring
and observation in North America，we discuss the mechanics controlling conditions of controlling network cracks at hydraulic
fracturing treatment. Rock brittleness index is fundament of inducing initiation points and multi-fractures；well-grown structure
weak planes（such as joints and natural fissures）are necessary conditions of inducing networks；horizontal stress contrast
in reservoir formation and intersect angle of natural fracture are principal controlling conditions of induced network；
low-permeability tight reservoirs are the precondition applying network hydraulical fracturing. Technology conditions were
expounded as follows：low-viscosity fluid is necessary for inducing the network fracture，and higher net pressure（factor）is an
important technic measure to increase the affected area of network fractures. Lastly，stimulation design ideas differences from
conventional and non-conventional hydraulic fracturing are compared，so new ideas for correctly judgment and application
network fracturing，it is important to guiding the practice of hydraulically network fracturing.

Key words: hydraulical fracturing, artificial fracture, network fracture, stimulation reservoir volume, shale