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Development techniques of the horizontal wells in Changling volcanic gas reservoir

ZHU Li-yao,LI Liu-ren,MA Cai-qin (Research Institute of Petroleum Exploration and Development,Petro-China,Beijing 100083,China)  
For recent years,the volcanic gas reservoirs are discovered in China and developed in succession.Normally,the volcanic gas reservoirs are characterized by various rock types,complex lithologies and lithofacies,multifarious pore and throat structures,low porosity and permeability,and extremely serious heterogeneity,etc.Due to the complex geologic characters and huge development difficulty of the volcanic gas reservoirs,Changling volcanic gas reservoirs being taken as an example,and the technical factors of the horizontal wells increasing single-well productivity,productivity replacement ratio,area replacement ratio and single-well control reserves are analyzed.Comparing the technical factors of the horizontal well with those of vertical well,it is shown that the horizontal wells are more effective in the development of volcanic gas reservoirs and the vertical wells.
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