井眼缩径分析与预防对策

Analysis of hole undergauge and its preventive strategy

川东构造在钻探作业中因井眼缩径造成起下钻的阻卡时有发生 ,文中对造成井眼缩小的原因进行分析并划分为五类因素 ,提出应在地质构造特征方面优化设计 ,采用合适的液柱压力 ,选择不同的钻井液类型 ,使用先进的钻井工艺和完善现场技术管理等措施进行预防和处理 ,将取得重大的经济效益。

Tight trips often occur for hole undergauge during drilling in east Sichuan Oilfield.The paper analysis the causes of hole undergauge,proposes preventive and treatment measures which are to optimize design from geologic structure features,to use suitable fluid column pressure,to select different drilling fluid types,to adopt advanced drilling technology and perfect field technical management.Therefore,good economic benefit will be obtained.