新型泡沫金属筛管堵塞机理及影响因素试验研究

Experimental Study on Plugging Mechanisms and Influencing Factors of a New Foam Metal Screen

为了解新型泡沫金属筛管的堵塞机理和优化筛管结构,利用全尺寸防砂试验装置模拟泡沫金属筛管的堵塞过程,采用比采油指数评价筛管堵塞程度,分析不同泥质含量、筛管精度和泡沫金属层厚度下的堵塞程度及堵塞机理。结果表明,表层颗粒架桥是泡沫金属筛管堵塞的主要原因,筛管的比采油指数随泥质含量增大呈指数函数衰减,最终约稳定在0.075m3/(d·MPa·m),与不含泥质时相比,下降了约78%;泡沫金属层孔径增大,比采油指数随之增大;泡沫金属层厚度增大,比采油指数的变化很小。新型泡沫金属筛管堵塞机理及影响因素的研究结果,为进一步优化筛管结构提供了理论依据。

In order to study the plugging mechanisms and optimize the structure of foam metal screen,the plugging process for foam metal screens was simulated by a large-scale sand control simulation device.With the screen plugging degree evaluating the specific productivity index,the plugging degree and mechanism under the different shale content,the screen precision and the thickness of the foam metal were analyzed.The experimental results showed that surface particle bridging was the main cause of foam metal screen plugging.The specific productivity index exponentially decreases with the increase of shale content where it finally stabilized at 0.075m3/（d·MPa·m）,which decreased by 78% compared with the index where there was no shale content.When the pore size of foam metal is increased,the specific productivity index increases.The increase of foam metal thickness had slight impact on the specific productivity index.The experimental study of plugging mechanism and influencing factors of foam metal screen provided theoretical basis for the optimization of screen structure.