頁巖儲層體積壓裂裂縫擴(kuò)展數(shù)值模擬
[Abstract]:Fracture initiation and expansion of hydraulic fracturing is a complex and nonlinear evolution process. On the one hand, the study of fracture initiation and expansion of hydraulic fracturing is of great theoretical significance for fracturing design and post-fracturing productivity evaluation. On the other hand, the underground rock mass is non-transparent and heterogeneous, which brings great difficulties to the crack propagation and failure observation. This paper is based on a set of hydraulic fracturing fracture mesh simulation program (SVFN) developed in 2013. The software is calculated by discontinuous displacement method of boundary element. It solves the problem that the finite element method can not deal with the singularity of crack tip effectively, and can simulate the interaction between multiple artificial cracks and a large number of natural micro-cracks, and the dynamic process of forming complex fracture network. In the process of writing the thesis, some subprograms of SVFN are compiled and debugged by C programming language. In this paper, the displacement discontinuity method of boundary element is introduced, the stress intensity factor is derived in the case of multiple cracks, and the crack cracking and extension criteria are given. Taking numerical simulation as the main research method, this paper deals with the extension of artificial fracture, natural microfracture, artificial fracture and natural microfracture, the extension form of fracture and the variation of fracture width in the process of volume fracturing. The interaction relationship and fracture intersection are studied. Through numerical simulation and analysis, the fracture and turning mechanism during volume fracturing and the controlling factors of formation of volume fracturing fracture network are summarized, and the effect of volume fracturing is subjected to the magnitude of in-situ stress. The length, width, azimuth, spacing, density, opening or closing of the artificial and natural fractures are affected by many factors. Natural cracks are most likely to crack at 30 擄. The influence of pressure and Young's modulus on fracture width is greater than that of Poisson's ratio, horizontal in-situ stress and fracture dip angle. This lays a foundation for better evaluation of volume fracturing effect.
【學(xué)位授予單位】:西安石油大學(xué)
【學(xué)位級別】:碩士
【學(xué)位授予年份】:2016
【分類號】:TE357.1
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