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物理法随钻防漏堵漏方法是利用专用井下工具将泵入的钻井液流量分流小部分,采用旋转射流直接作用于漏失井壁,配合合适的钻井液体系,使井壁滤饼形成的渗透率接近于零的随钻防漏堵漏技术。针对渗透性漏失及裂缝性漏失地层特点,以流体力学为基础,建立了基于物理法随钻防漏堵漏的物理模型,阐述了利用旋转射流的水力能量给漏失层井壁形成“人造井壁”随钻防漏堵漏的机理和方法。该方法不仅达到了随钻防漏堵漏的目的,还有效地扩大了钻井液密度安全窗口,有利于保护油气层。
Physical method while drilling leakproof plugging method is to use a dedicated downhole tool to pump a small part of the flow of drilling fluid, the use of rotating jet directly on the loss of the borehole wall, with the appropriate drilling fluid system, Close to zero rate while drilling leak-proof plugging technology. According to the characteristics of permeability loss and fracture loss formation, based on the fluid mechanics, a physical model based on physical method to prevent from leakage and plugging was set up. The hydraulic energy of rotating jet was used to form a “man-made well Wall ”when drilling leak-proof plugging mechanism and method. The method not only achieves the purpose of preventing leaks while drilling, but also effectively enlarges the safety window of drilling fluid density and helps to protect the oil and gas layers.