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研究目的是通过实验和建立模型来确定形成蚓孔所需的处理条件及地层特征。实验结果表明有很多因素影响其刻蚀性态,最重要的一个因素是岩样成分的不同。渗透率、孔隙度和矿物成分的空间变化是酸液在孔道中流动的驱动力,从而在砂岩中产生渗透性更高的孔道或蚓孔。模拟结果显示,在原始孔隙分布非均质时,特别是在有高孔隙薄夹层存在的条件下,可以获得高渗透性渗流通道。而这样的蚓孔对于均质岩石而言,即使在高温条件下用高浓度氢氟酸溶蚀,也不可能形成。该结论已得到实验结果的支持。
The purpose of the study was to determine the treatment conditions and formation characteristics required to form wormholes through experimentation and modeling. The experimental results show that there are many factors that affect the etching behavior. One of the most important factors is the composition of rock samples. Permeability, porosity, and spatial variation of the mineral components are the driving forces behind the flow of acid in the pores, resulting in more permeable pores or wormholes in the sandstone. The simulation results show that when the original pore distribution is heterogeneous, especially in the presence of high-porosity thin intercalation, a highly permeable seepage channel can be obtained. And such a wormhole for homogeneous rock, even under high temperature conditions with high concentrations of hydrofluoric acid corrosion, it is impossible to form. This conclusion has been supported by experimental results.