关键词: 聚合物溶液, 粘弹性, 油水界面, 平行力, 残余油, 驱动, 提高驱油效率

Abstract: Some past works,such as the performance prediction of reservoirs containing one or more hydraulic fractures with irregular azimuth,the simulation of three dimensional simulation of propped fractures,analyses on influence of initiation pressure and influence of the phase-seepage flowing curve of fractures, description of irregular boundary,effective simulation of reservoirs with non-horizontal or non-equivalent payzone thickness,the impact of varing fracture conductivity on performance of postfractured wells,are imperfect.A para-parameter finite element method can improve above works.A couple of differential equations for reservoir-fracrure system were established. The finite element theory was used as a discrete method for solving the above equations in apace,while the backward finite difference method was used in time step.The method of IMPIS and preconditioned conjugate gradient method were used to resolve the pressure equations of oil phase and equations of water saturation.On the basis of that,the Visual Basic for Windows language was used to develop the software for resolving above problems.In the meantime,the black oil model was used to verify the calculating results of the software developed in this paper.A field case shows an excellent agreement and indicates that the software developed by authors is reliable and can be put into field application.

Key words: low-permeability reservoir, hydraulic fracturing, seepage flowing model, production performance prediction, finite element method