针对长庆油田陇东地区易漏失的洛河组砂岩物性特点，利用屏蔽桥堵原理开展实验研究，通过调整碳酸钙的粒度分布，选择惰性降失水剂作填充粒子，建立了合理的桥堵体系。室内和现场试验表明，该体系能够提高漏层的承压能力，满足钻井、固井工程施工的要求。 According to the characteristics of sandstone in Luohe Formation, which is easily lost in Longdong area of ​​Changqing Oilfield, the shielding bridge was used to carry out experimental research. By adjusting the particle size distribution of calcium carbonate and selecting the inert dropout agent as filler particles, a reasonable bridge block system. Indoor and field tests show that the system can improve the bearing capacity of the leakage layer and meet the requirements of drilling and cementing engineering.