Influence factors for production of dual-lateral well in multilayer heterogeneous reservoirs
Influence factors for production of dual-lateral well in multilayer heterogeneous reservoirs
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发表时间：
2004
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通讯作者：
Han Guo-qing
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作者：
Han Guo-qing
根据非均质多层油藏特点，建立了多分支井半解析产能预测模型。分析了双分支井产能的影响因素。研究结果表明，分支间夹角越小，油井产能损失越大。两个分枝的形成特征差异越大，生产力高的分枝就越不可能达到最大生产力，从而影响总产量。井筒摩阻和错流效应造成的压力损失对双分支井产能影响较小。因此，在双分支井设计中，分支间夹角应尽可能增大，且分支错流点应远离产层。建议双分支井井底压力不宜高于任一分支地层压力，布设两分支时应选择压差相近的油层，以发挥两分支的产能潜力。
According to the characteristics of heterogeneous multiplayer reservoir, a semi-analytical productivity prediction model for multilateral wells was established. The influence factors for productivity of dual-lateral well were analyzed. The researched results show that the smaller the angle between branches is, the larger the productivity loss of oil wells will be. The bigger difference of formation features between two branchesis, the less likely the branch with high productivity is to reach its largest productivity, which would affect the gross production. The pressure loss resulted from well bore friction and cross-flow effect would only have a little influence on productivity of dual-lateral wells. So, in the design of dual lateral wells, the angle between of branches should increase as large as possible, and the cross-flow point of branches should be far away from pay zone. It is recommended that the bottom hole pressure of dual-lateral wells should not be higher than the formation pressure of any branch, and oil formations with the similar pressure difference should be selected when positioning two branches, so as to exert the productivity potential of two branches.