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Research on deliverability of horizontal well with separated injection and production scheme

LIU Hui-qing~(1), ZHANG Hong-ling~(1), LI Cun-gui~(2), XUE Guo-gang~(2), GUO Dian-bin~(2)(1.China University of Petroleum(Beijing),Beijing 102249;2.Zhongyuan Oil Field Company,SINOPEC,Henan 457015)  
This paper presents a new development scheme of separated injection and production in horizontal well for small block reservoirs or restricted reservoirs by production conditions.It is possible to separate the long completion horizontal interval with special pack for injection and production at same time,and the reservoir with pressure maintenance under waterflooding.The model of deliverability has been built based on potential superposition principle for different horizontal well length and block scale with constant pressure outer boundary.Flowing rate distribution along the horizontal well can be gotten for specified injection and production pressure.One of the injection pressure and production pressure will be specified and iteration method will be used to keep the balanced injection and production.It has been also shown that flowing rate distribution is not symmetry because of interference of injection and production,and the more interference the longer production interval.The separate interval has some effect on the distribution,and the less interference the larger separate interval.Production rate is direct proportion as pressure difference of injection and production with given length of horizontal well,so it is necessary to consider the pressure difference limitation of the packer for production rate dispatching of larger length horizontal well.
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