Research On The Fracture Network Pattern During Volume Fracturing In Tight Oil Reservoirs Of Chang 7 Areas

Tight oil is a typical unconventional oil-gas resource, which characterized hy continuous distribution of self-generating and self-storage and ultra-low permeability and poor connectedness, it is hard to achieve the expected stimulation effect only on the traditional single fracturing, because of the poor supply ability from the matrix to fracture in the low-permeability reservoirs. In order to increase initial productivity and ultimate recovery rate, it’s necessary to reforming reservoir by volume fracture,and there’s no system study about it.Based on the models of elastic and fracture mechanics, using boundary element method, the paper studies the fracture network modal. To begin with, the paper studies the major fracture and natural fracture interaction, inclding one major fracture and two major fractures. Then simulate compression fracture network for A and B tight oil reservoir, including different stress conditions, fracture pressure and angle of natural fracture.The research shows that a propagating hydraulic fracture will induce a nature crack cracking and propagating before they contact, and the main fracture pressure is bigger and, the easier to recreat fracture propagating, and the interaction between fractures decreases as their distance increases.For multiple clusters fracturing, take two fractures for example, they change direction during propagating. The earlier extension fracture inhibition the later, the greater distance between fractures the smaller. This paper shows two fracture network mosdal, water wave type, grid type. This paper has big significance on understand the fracture network from volume fracturing and evaluate fracturing results.