摘要
钻井过程中的井壁失稳现象普遍,不仅增加了钻井作业的难度,而且使固井质量难以保证。井壁坍塌主要是井内钻井液液柱压力过低不能对井壁提供足够的支撑所造成,而井壁发生破裂是井内钻井液液柱压力过大而造成的。通过研究,推出不会产生井壁失稳所需的钻井液密度的计算公式,以便施工人员采用合理的钻井液,保证快速、安全地实施钻井过程。
Nowdays, it is the most common phenomenon that the stability of the wellbore is one of the most important considerations in any angle wells. It not only increases the difficulty of the drilling, but also easily makes the wellbore instability. The wellbore collapses attribute to the drilling fluid pressure being low to the formation, and the wellbore fracture is caused by too large drilling fluid pressure. From the study of the wellbore, it is the most important to calculate the density of the drilling fluid when the wellbore instability will occur, so that workers can adopt the reasonable drilling fluid which can be benefit to the drilling. So it is important to study wellbore instability by the formula of the drilling fluid.
作者
赵小龙
唐建新
范军
ZHA O Xiao-lon, TANG Jian-xin, FAN Jun （1.Chongqing University,Chongqing 400045 ; 2. Chongqing University of Science and Technology,Chongqing 400042）
出处
《重庆科技学院学报：自然科学版》
CAS
Journal of Chongqing University of Science and Technology:Natural Science Edition
关键词
井壁稳定性
井眼坍塌
岩石力学
钻井液密度
坍塌压力
破裂压力
地层孔隙压力
wellbore stability
wellbore collapse
rock mechanics
drilling fluid density
collapse pressure
fracturepressure
formation pressure
