孤岛油田中二北Ng3-4注聚前整体调剖技术应用

The application of profile control technology before polymer injection in Ng3-4 cell of the north of central region 2 of Gudao Oilfield

在对孤岛油田中二北Ng3-4单元进行注聚开发中,为了改善长期注水开发造成的层间、层内矛盾,控制聚合物的窜流,发挥聚合物驱油作用,根据区块注入井压降曲线、指示曲线等油藏动、静态资料,采用PI决策技术对单元存在大孔道的注入井进行整体剖面调整。通过室内实验筛选,确定采用“无机颗粒型+木质素磺酸钙冻胶型”复合堵剂、多段塞组合调剖工艺。现场应用表明,该工艺的实施能够大幅度提高水井压降指数,改善层间、层内矛盾,有利于提高后续聚合物驱油效果。

During polymer injection development in the Ng3-4 unit of the north of central region 2 of Gudao Oilfield, in order to improve the inner interference of layer, control injected polymer breakthrough, according to dynamic and static reservoir data, such as pressure fall-off curve, index curve of injection well, with the help of PI decision making technologies, profile control techniques before polymer injection are successfully applied to injection wells, which have low pore pressure and big pore passages. The application results have shown that the combination of inorganic grains, composite plugging agents and multiple slug combination profile control techniques is able to largely improve pressure drop index of water well and polymer flooding.