The Numerical Simulation Applied Technological Rescarch Of Chang7Super-low Permeability Reservoir Water Injection Development

With the depth of exploration degree during recent years, the Chang7reservoir show alarge resource potential and development prospects and are also important succeed formationin Ordos Basin. With the oil reservoir thickness range of2.3～18.1m, the average porosity7.05⁷.27%and the average permeability0.07～0.13×10^-3 μm², The Chang7reservoir is thedelta front sub-facies sedimentary that belongs to delta sedimentary system, is typicalsuper-low permeability reservoir （tight reservoir）. This kind of "low grade" resources show thecharacteristics of tight reservoir, poor property and low abundance, and it bring great difficultyto reasonable development.Considering that when the fluid flow through the super-low permeable reservoir, italways has some special features, such as no-Darcy flow which has the kickoff pressuregradient and the elastic-plastic deformation in oil layer, the Chang Qing oil filed has proposedan effective water injection mode in order to improve the effect of oil reservoir development,and that is advanced water injection.This paper will take An83district’s Chang7reservoir of JiYuan oil filed for example to The numerical simulation applied technological research ofChang7super-low permeability reservoir water injection development, which has theimportant theoretical meaning and practieal application value.This paper study on the basis of An83district’s Chang7reservoir geologicalcharacteristics of Ji Yuan oil filed, carries out the comprehensive evaluation of reservoir. Usingthree-dimensional stochastic modeling, reservoir engineering theory and numerical simulation,combined with the successful development theory of the low permeability reservoir, researchadvanced water injection timing and reasonable injection parameters, finally ascertain thereasonable limits of each parameter. This paper has a good guidance to enhance wellproduction and develop in high efficiency economically the super-low permeability reservoirs,and have very important reference values and guiding significance to develop the super-lowpermeability reservoir of whole ordos basin and to improve the reservoir of scale and benefit.