【摘要】 通过理论分析与数值模拟相结合,分析对比SIS水平井与常规水平井的开发效果,在此基础上从生产制度与井型设计两方面对SIS水平井进行优化设计。研究表明,渗透率在1~40 mD,含气量小于12 m3/m3时,SIS水平井的采出程度是常规水平井的2~7倍。因此对于含气量较低,渗透率中等,割理较发育的中煤阶煤层气藏,SIS水平井具有较大的优势。SIS水平井合理泵排量为60~90 m3/d,合理生产井井底流压应控制在0.15~0.2 MPa.同时SIS水平井分支长度在1 100 m左右,分支夹角在40°~50°,SIS水平井主轴方向与面割理垂直时,SIS水平井开发效果最佳。更多还原

【Abstract】 The successful use of surface-in-seam(SIS) well in medium coal rank coalbed methane(CBM) of Moranbah field indicates that SIS wells have the benefits of high productivity,easy operation and broad applicability.Through theoretical analysis and CBM simulation,this paper analyzes the performance between SIS well and horizontal well,and optimizes SIS wells from both production regulation and well design.The result shows that the recovery factor of SIS wells is 2~7 times higher than horizontal wells as the permeability is about 1~40 mD and the gas content is less than 12 m3/m3.Therefore,for the reservoir with low gas content,medium permeability and such a CBM,SIS well is obviously advantageous than horizontal well.When the rational pump displacement of SIS well is about 60~90 m3/d,its downhole pressure should be controlled at about 0.15~0.2 MPa.And when the branch length of the SIS well is about 1 100 m,the optimized branch angle is about 40°~50° and the central axis orientation of SIS well is perpendicular to face cleat,its production performance will be the best.更多还原