本文通过大43区块215.9mm钻头下177.8mm套管固井施工实践,总结了该区块小间隙、低压易漏层固井的技术措施,解决了小间隙、低压易漏层固井的难题。结果表明:选择合理的固井施工方案、优选合适的水泥浆体系,是保证小间隙、低压易漏层固井质量的关键。 In this paper, through the cementing practice of 177.8mm casing under the 215.9mm bit of Da 43 block, the technical measures of well cementing with small gap and low pressure easy-to-drain layer are summarized, which solves the difficult problems of small gap and low pressure easy-to-drain well cementing . The results show that selecting the reasonable cementing construction scheme and choosing proper cement slurry system is the key to ensure the cementing quality of the small gap and low pressure easing layer.