低固相聚合物钻井液在大邑地区的应用

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.

Application of Low Solid Content Drilling Fluid in Dayi Area

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 seri...