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在大斜度大位移定向井中,岩屑在井眼中极易积累形成岩屑床,导致起钻困难、蹩泵、甚至卡钻,完井作业难度大、固井质量差。本文分析了岩屑床的形成及危害,总结了影响井眼净化效果的因素,提出了提高井眼净化效果的几项途径。在施工的多口大斜度、大位移定向井中应用效果良好,为施工该类型定向井提供了一定的技术支持。
In large-inclination and large-displacement directional wells, cuttings are easily accumulated in the wellbore to form cuttings beds, resulting in difficult drilling, bad pump and even stuck pipe. The completion operation is difficult and the cementing quality is poor. This paper analyzes the formation and harm of cuttings bed, summarizes the factors that affect the effect of wellbore purification, and puts forward several ways to improve the effect of wellbore purification. In the construction of multi-port high-inclination, large displacement directional well application effect is good, for the construction of this type of directional well provides a certain degree of technical support.