摘要
大邑区块地质条件复杂,井壁稳定性差,裂缝发育导致漏失严重,可钻性差。研究表明,钻井液的固相含量与钻柱的振动密切相关,固相含量的提高增加了钻井液的粘度,同时增加了阻尼作用。在大邑区块使用低固相钻井液钻井时,钻具振动减少,钻具失效相对较少;而用无固相钻井液时,钻具失效严重。BHA横向振动衰减有限元分析表明,使用低固相钻井液,钻柱阻尼作用得到增强,钻柱横向振动衰减越快,承受交变复杂应力的时间越短,越不容易出现疲劳失效。
Dayi formation is characterized by complicated geological conditions,poor wellbore stability and serious drilling fluid lost led by fracture development,and poor drillability.The results suggest that solid content in drilling fluid is related to the drill string vibration.With increase of solid content,both the viscosity of drilling fluid and damping effect are increased.When the low solid content is applied in Dayi area,the chance of drill string failure is relatively small,but drill string failure is serious when the non-solid drilling fluid is used.The BHA transverse vibration attenuations on the different conditions of damping action are also studied by Finite Element Method.The results show that the application of low solid content drilling fluid can increase the string damping action and transverse vibration attenuation is faster which do not easily lead to fatigue failure.
出处
《重庆科技学院学报（自然科学版）》
CAS
2010年第4期30-32,共3页
Journal of Chongqing University of Science and Technology：Natural Sciences Edition
关键词
钻具失效
低固相
钻井液
drilling tool failure
low solid content
drilling fluid
