泥质粉砂岩层中储存了大量的油、气与水资源,但其开采一直受其低渗透条件和防砂所制约.基于此,通过设置N2驱替防砂实验,分析其防砂、产气规律.在对比实验前后的驱替储层垂直方向的颗粒级配曲线后,发现实验前后颗粒级配曲线不重合,说明实验后储层颗粒发生了运移和重新排列,形成了细粒与砂拱相结合的结构为“泥皮+砂拱”结构,它以稳定的砂拱作为支撑,以其细粒结构作为阻砂结构,共同阻挡细粒物质的运移.在通过电镜扫描观察后,发现细粒层存在针孔状孔隙,保证了持续产气的功能,为类似工程提供了参考依据.
A large amount of oil, gas and water resources are stored in the argillaceous siltstone, but its exploitation is always limited due to its low permeability condition and sand control difficulty. In this work, the sand control and gas production laws are analyzed by setting N2 displacement experiment under cut condition. After comparing the vertical grain grading curve of the displacement reservoir before and after the test, it is found that the grain grading curve before and after the test does not coincide, which indicates that after the test, the particles of the reservoir have migrated and rearranged, forming the structure of “mud skin + sand arch” which combines the fine particles and sand arch. It takes the stable sand arch as the support and its fine particle structure as the sand blocking structure to block the fine particles together with transport of granular materials. Through the scanning electron microscope, it is found that there are pinhole like pores in the fine-grained layer, which ensures the gas production without blocking. This work provides a reference for similar projects.
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