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本文提出一种为各向异性储层中任意方位的水平井或水力压裂井建立等效各向同性系统的方法。这个等效的各向同性系统可用于计算原系统的压力响应。水平井的解与文献中原有的解作了比较。但据我们所知,迄今为止还没人提出过水力压裂井的解。此研究证实了Yildiz和Ozkan的观察,即水平井方位与最佳方位间的较小偏离(最大20°)对压力响应的影响不大。同时,由于此解是在等效各向同性系统的基础上得出的,故此研究也证实了Eaulougher的观察,即单井试井无法识别各向异性系统。
This paper presents a method to establish an equivalent isotropic system for horizontal wells or hydraulic fracturing wells of any orientation in anisotropic reservoirs. This equivalent isotropic system can be used to calculate the original system pressure response. The solution of horizontal well is compared with the original solution in the literature. However, to our knowledge, no one has ever proposed a solution to a hydraulic fracturing well. This study confirms the observation of Yildiz and Ozkan that small deviations (up to 20 °) between horizontal and azimuth orientations have little effect on the pressure response. At the same time, since this solution is based on an isotropic isotropic system, the study also confirmed Eaulougher’s observation that a single-well well did not recognize anisotropic systems.