砂泥岩交互储层支撑剂导流能力实验及应用

在砂泥岩互层的压裂施工中，由于压裂层数多且薄，所造缝的缝宽较窄，且由于支撑剂的大量嵌入，导致支撑裂缝导流能力进一步变差。为使裂缝参数与地层参数相匹配，在对不同粒径、铺砂浓度和支撑剂嵌入等复杂条件下的导流能力进行评价的基础上，进行了组合粒径实验研究，结果表明：尽管在闭合压力较小时，20/40目与16/30目组合粒径导流能力均与16/30目支撑剂有较大差距，但随着闭合压力的升高，使用组合粒径（20/40∶16/30=3∶1）获得的裂缝导流能力已经接近单一粒径（16/30目）的导流能力。现场对Y3438井优化得到了组合粒径的最佳比例，压裂施工后取得了显著效果。研究成果对胜利油田滩坝砂岩储层的压裂改造有重要的指导意义。

EXPERIMENTAL STUDY ON AND FIELD APPLIANCE OF PROPPANT CONDUCTIVITY IN ALTERNATING FORMATIONS OF SANDSTONE AND SHALE

In the fracturing operation of alternating formations of sandstone and shale，the flow conductivity capacity of proppant fracture gets worse due to multiple fractured layers and thin layers，narrow width of generated fractures and a large amount of proppants being embedded.The factors affecting the fracture conductivity are researched in order to match the parameters of fracture and formation，such as different size of proppants，sanding concentration，proppant embedment and so on.On the basis of that，the study on different combination of proppant is carried out.It is indicated that although there is a greater difference between the flow conductivity capacity of 20/40 mesh and 16/30 mesh combination size and that of 16/30 mesh proppant when closure pressure is lower，as the closure pressure rises，the fracture flow conductivity capacity of combination proppants （20/40∶16/30=3∶1） is close to the flow conductivity capacity of single proppant （16/30 mesh）.By optimizing the ratio of combination proppant in well Y34-38，considerable result is achieved after fracturing.