聚合物驱井下单管多层分注工艺

为改善聚驱井层间层内吸聚差异大的问题,开展了聚合物驱井下分层配注工艺研究,通过实验分析、结构优选,将连续扩缩管结构和同心配注器结构结合,研制了低剪切配注器等分注工具和配套的投捞测试仪器,实现了聚合物驱井下单管多层分层配注,分注层数达3层,在单层流量180 m3/d时,可以产生3.6 MPa以上的压降,使聚合物剪切降解率小于6%,分层密封压力达25 MPa以上,投捞调配负荷小于4 kN。现场应用该技术,可减少聚合物溶液沿高渗透条带突进现象,使差油层得到很好动用,注聚剖面得到有效调整,改善聚合物驱开发效果。

Study on Downhole Separate Layer Injection of Polymer in Multi - Layer Reservoirs

To solve the difference of polymer flooding in interlamination or in-layer, studied the technology of downhole separate injection of polymer solution, developed injection tool of low shearing, et al, and necessary running and pulling test instrument, realized downhole separate layer injection of polymer solution with single-string. Injecting polymer in 3 layers at the same time, and the drawdown reach 3.6 MPa at the flow rate of 180 m~3/d, the rate of shear degradation less than 6%, layered sealing pressure reached to 25 MPa, running and pulling loading smaller than 4 kN. Applications achieved effectively, and control the polymer solution flowing along high permeability reservoir in high speed, improve the development effect of polymer flooding.