钻井过程中暂堵剂颗粒尺寸优选研究

如果钻井液能够在井壁上形成渗透率近于零的泥饼，则具有更好的储层保护效果，因此需要依据暂堵剂粒径与储层孔隙尺寸之间的最佳匹配关系，寻找一种更合理的暂堵剂优选方法。应用颗粒堆积效率最大值原理，提出了一种利于储层保护的暂堵剂优选新方法，能够更加快速、准确地得出不同粒径的暂堵剂产品之间的最佳配比组合。结果表明：与传统方法相比，新方法具有更高的岩芯渗透率恢复值，能够更有效地阻止固相颗粒和滤液侵入油气层，利于保护储层。现场试验证实，利用新方法可取得理想的储层保护效果。

The Application of Optimizing Particle Size of Grain Blocking Agents in the Drilling Process

If the drilling fluid can form the mud cake with no permeability on the borehole wall, the drilling fluid will have better reservoir protection effectiveness. We need to find a more reasonable method, based on the optimum matching relationship between particle size of temporary blocking agent and pore size of reservoir. According to the“Ideal Packing Theory”and the“d90 Rule”, a new beneficial optimum method for reservoir protection is put forward. We can find out the optimum matching relationship more rapidly and accurately, among different kinds of temporary blocking agent products with a variety of particle size. Compared to traditional methods, the new method is of a higher recovery value of core permeability, and it can stop the solid particle and filtrate from invading into hydrocarbon reservoir more effectively. Therefore it is good for reservoir protection. Field test also confirmes that application of this new method can achieve the ideal effects of reservoir protection.