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油田开发过程中,由于井底附近地层的宏观及微观非均质,在长期注水过程中,往往因注入水的定向冲刷、溶蚀与压裂作用,而形成次生裂缝,加剧了注入介质的非径向渗散。另外油水井若采用人工压裂措施,也会使注采井附近的油水流沿裂缝单向突进。因而裂缝的存在将影响水驱油的波及效率。因此,在开发过程中,判断油水井附近地层中是否存在天然裂缝或形成次生裂缝而引起单向突进是一个相当重要的实际问题。S.M.El-Hadidi于1977年在文献[1]中提出应用注水井压降曲线确定井底地层裂缝的方法。本文将对在井底裂缝中呈线性渗流的数学模式重新求解,并结合矿场实例进行验算,以将所述方法应用到生产井的试
In the process of oilfield development, due to the macroscopic and microscopic heterogeneity of strata near the bottom of the well, during the long-term water flooding, secondary cracks are often formed due to the directional erosion, dissolution and fracturing of the injected water, which aggravates the non-uniformity of the injected medium Radial seepage. In addition, if oil and water wells are fractured by manpower, oil and water flow near the injection and production wells will also protrude unidirectionally along the crack. Thus the existence of cracks will affect the sweep efficiency of water flooding. Therefore, during the development process, it is a quite important practical problem to judge whether there are natural cracks or secondary cracks in the strata near oil and water wells to cause unidirectional sudden rise. S.M. El-Hadidi proposed in [1] in 1977 the method of determining wellbore fractures using the pressure drop curve of water injection wells. In this paper, the mathematical model of linear seepage in the bottom hole fractures will be solved again, and then combined with mine examples to verify the method to apply the method to the production well test