混合型流入控制装置改进及性能分析

Improvement to hybrid inflow control device and its performance analysis

被动式流入控制装置(PICD)在油井见水后易失效.提出一种基于混合型流入控制装置(ICD)和遇水膨胀橡胶(WSR)的自膨胀型自适应流入控制装置(AICD),分析流体性质敏感性并优化结构参数,与喷嘴型、喷管型、螺旋通道型和混合型等4种流入装置(在流动阻力等级FRR相同时)比较.结果表明:一旦油井见水,自膨胀型AICD上预装的遇水膨胀橡胶膨胀,且膨胀度根据含水率自动变化,从而改变装置的最小过流面积和流动阻力等级;在泥浆返排阶段防堵塞能力强,在稳产期抗冲蚀性能强,在衰竭生产时能够持续控制入流且对黏度不敏感.该装置还可以根据流体类型自动改变流动阻力.

Since the passive inflow control device(PICD)will be ineffective once the water breakthrough does occur,a self-expandable autonomous inflow control device(AICD)is proposed on the combination of hybrid inflow control device(ICD)and water swelling rubber(WSR).To highlight the excellent performance of the novel design,four other designs(nozzle-based type,tube type,helical channel type,and hybrid type)with a same flow resistance rating(FRR)are compared,with the structural parameter optimization and fluid property sensitivities researched.The results show that the WSR installed in the self-expandable design will swell once water breakthrough occurs,and the swell increment will be adjus-ted automatically according to the water content,thus changing the minimum flow area and flow resistance rating.Moreover,the novel design has good performances during every phase of a well's life:high plugging resistance at startup,high erosion-resistant during peak production,continuous inflow control and low viscosity sensitivity during declining,and significantly flow resistance difference for different fluids.