分体式不提钻钻孔压水试验孔口装置的研发与应用

Development and application of split type wellhead device forwater injection test without tripping the drill string

摘要:

在钻探施工过程中，由于工程要求，必须对钻孔做孔口压水试验，根据钻孔吸水量、压力数据，检验钻孔的漏失及其他情况。传统孔口压水试验使用的孔口装置，必须把孔内钻具提出孔外，严重地影响工程施工进度。分体式不提钻钻孔压水试验孔口装置的研发，可在不提钻的情况下完成孔口压水试验作业，大幅度缩短施工工期，减轻工人的劳动强度，减少安全事故的发生，对钻探工程施工具有一定的经济价值和现实意义。本文详细介绍了研制的分体式不提钻钻孔压水试验孔口装置的结构、工作原理及使用方法，并与传统孔口压水装置进行了试验对比，验证了分体式不提钻孔口压水试验孔口装置工作的可靠性及优势。

Abstract:

According to the project requirements, wellhead water injection tests need to be conducted in the drilling process to detect its leakage and other failures based on the water absorption of boreholes and the pressure data. In the conventional way of wellhead water injection tests, drilling tools should be lifted out of the borehole, which severely affects the construction schedule. The development of the split type wellhead device allows the test to be done without lifting the drill string up, which is of great economic value and practical significance as it saves time, reduces labor intensity and safety accidents. This paper introduces the structure, working principle and application of the split type wellhead device developed for water injection tests without tripping the drilling string, and compares it with the conventional wellhead water injection devices through tests to verify its reliability and advantages.