Study On The Numerical Simulation In Fracturing With Oriented Perforation Of Straight Well And Multi-fracture Fracturing Of Inclined Well

In recent years, the proportion of low permeability layer reserves increase every year in the proven initial oil in place. How effective development and utilization of low permeability hydrocarbon resources, has great significance for sustained and stable development of China’s petroleum industry. Low permeability reservoirs have the characteristics of low permeability, filtrational resistance, and poor connectedness and so on, it is difficult to meet the needs of economic development. The artificial fracturing techniques as one of the most effective reform measures to develop low permeability hydrocarbon reservoir, has become the most important means of developing low permeability reservoirs. At present, many studies start from the expansion of drainage volume to carry out oriented perforation fracturing of straight well and multi-fracture fracturing of inclined well. Studies have yielded better experiment results. But the studies of stimulation mechanism has been lacking, restricting further development of the process. In order to improve the relevance of the program and provide theoretical guidance for the further development of the craft, we need to carry out numerical analogue.In this paper, I’ll use the finite element methods to study on the numerical simulation in fracturing with oriented perforation of straight well and multi-fracture fracturing of inclined well. The finite element method has a flexible gride mesh, the powerful simulation ability to irregular boundary, etc. It particularly suit to solve the reservoir infiltrating fluid problem with artificial fractures. In the simulation study of fracturing with oriented perforation of straight well and multi-fracture fracturing of inclined well, it is hard to analog computation a non-linear fractures. In this paper, we use the mixed cell finite element method, see the reservoir and fractures as a percolation system to establish a unified mathematical model, employ the line unit to handle artificial fractures. The advantages of the method are a reasonable description of the complex fracture morphology. We use triangular element of arbitrary shape to handle the layer. On this basis, we use FORTRAN language establish numerical simulator of the finite element method, to achieve a rightful description and analog computation of complex fractures.This paper carries out a systematic study of production performance and its influencing factors on fractured well based on diamond inverted nine spot flooding pattern. To the different calculation unit of straight well oriented perforation, we study effects of different crack initiation angle and different steering distance on fracturing. To multi-fracture fracturing of inclined well, we study effects of different azimuth, different fracture number and different physical parameters on fracturing. Through comparative analysis of simulation results, we draw meaningful conclusions, and provide a theoretical guidance for the on-site fracturing operation.