沾18块Ng_下 1砂组稠油热采鱼骨状分支水平井优化研究

Optimization of Fish-bone Lateral Horizontal Wells for Thermal Recovery of Heavy Oil in 1st Sand Formation of the Lower Member of Guantao Formation in Block Zhan18

根据沾18块的地质条件建立了三维网格模型,采用CMG热采软件的STARS模块对沾18-支平1井的主支长度、分支数、分支角度、分支长度、纵向位置、注采参数等进行了优化研究,确定的最佳优化结果是:主支长度450m,分支数4个,分支夹角20°～30°,分支长度100～130m,纵向上位于油层中部,注汽强度7.5～10t/m,最大排液量100～120t/d。预测沾18-支平1井比常规水平井提高采收率2.6%。

A 3D grid model was established based on the geologic conditions of Block Zhan 18,STARS in CMG thermal recovery software was used for optimizing the well length,number of lateral,angle of lateral wells,length of lateral holes,vertical position and injecting-producing parameters in horizontal well of Block Zhan 18.The optimized result includes that the main branch length is 450m with 4 branches,20~30°lateral hole angle,100~130m length,its vertical position is in the middle,steam injection strength is 7.5~10 t/d,maximum fluid-withdrawal is 100~120 t/d.predicted oil recovery factor is 2.6%higher than that of conventional horizontal wells.