大口径工程井套管事故及预防技术措施

Casing Failure in Large Diameter Project Well and the Prevention Technique

摘要:

近几年国内施工大口径煤矿瓦斯排放井、输冰降温井、注氮井、送料井等特殊用途工程井时，常发生套管下不到位、套管折断跑管、固井时将钻杆固在井内、套管挤毁报废等事故，给施工单位造成巨大的经济损失。结合近年来的施工经验对大口径工程井常见事故进行研究，分析了事故的成因，提出了采取的预防措施。

Abstract:

Incomplete casing, case breaking, drilling rod cementing and case collapsing often occur in the construction of large diameter coal mine gas emission well, ice transmission cooling-well, nitrogen injection well and feeding well in China in recent years. The paper analyzed the failure causes according to the study on common accident of large diameter project well, and put forward the prevention measures.