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New methods of determining productivity ratio,flow resistance ratio,drainage area ratio and skin factor of horizontal well

Chen Yuanqian(Research Institute of Petroleum Exploration and Development,PetroChina,Beijing,100083)  
Based on two production rate formulas of horizontal well by Chen Yuanqian and Joshi,new methods of determining productivity ratio,flow resistance ratio,drainage area ratio and skin factor of horizontal well are proposed in paper.The results of example application indicate that methods proposed on this paper are effective and reliable.
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