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Study on Contrast of Two Deliverability Equations of Horizontal Well

Zhang Feng(Vehicle and Energy College,Yanshan University),Zhao Pingqi(Dagang Oilfield Company),Chen Yuanqian(Petroleum Exploration and Development Research Institute),Qin Jianmin(Shallow Water Exploration and Development Company,Dagang Oilfield Company)  
Two methods for calculating the productivity of horizontal wells,Chen's formula and Joshi's formula,are contrasted and analyzed.By comparison and calculation of the factors affecting the productivity,such as drainage area,reservoir thickness,horizontal well length,the anisotropy ratio of reservoir permeability,it indicates that the changing trend of productivity with every influence factor from Chen's formula is accordant with Joshi's.Chen's formula is more practical due to the simple and feasible computational method of getting half of the major axis of an ellipse of drainage area in horizontal well.
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