钻探工程2025，Vol.52Issue(4)：46-53,8.DOI:10.12143/j.ztgc.2025.04.006
裂缝型漏失地层钻井液防漏堵漏数值模拟研究
Numerical simulation study on leakage prevention and sealing of fractured formation drilling fluids
摘要
Abstract
Leakage prevention and plugging of drilling fluid is a key technical measure to ensure drilling safety,protect reservoirs,reduce economic losses,improve drilling efficiency and environmental protection.Due to the limitations of actual observation and experimental conditions in the field,it is difficult to explore the plugging mechanism of leaky formations.In order to better explain the particle plugging mechanism of fractured leaky formations,this study used COMSOL Multiphysics to establish a plugging model for fractured formations,and analysed the effects of particle concentration,particle size and particle gradation on the plugging efficiency of fractured leaky formations,so as to reveal the specific mechanism of particle plugging.The results show that:(1)The plugging efficiency is positively correlated with the particle size.The larger the particle size,the shorter the plugging time under the same concentration.(2)There is an effective blocking range for particle concentration,and effective blocking cannot be formed when the particle concentration is lower than the lower limit of the range,while the increase in concentration has little effect on the blocking efficiency when the particle concentration is higher than the upper limit of the range.(3)The particle gradation can synergistically improve the blocking efficiency and blocking densification.When the concentration of large-sized particles is the same and the mass fraction of small-sized particles concentration is increased by 1%,the final leakage velocity is reduced by 35%;When the concentration of small-sized particles is the same and the mass fraction of large-sized particles concentration is increased by 4%,the formation time of crack bridge plugging is reduced by 50%.The small particles in the plugging particles mainly affect the densification of the plugging layer,while the large particles mainly affect the plugging efficiency.关键词
裂缝型漏失/钻井液堵漏/数值模拟/颗粒封堵/桥堵效率/颗粒级配Key words
fractured leakage/plugging of drilling fluids/numerical simulation/particle plugging/bridging efficiency/particle grading分类
天文与地球科学引用本文复制引用
孔二伟,王利锋,韩子辰,刘长晔,杨现禹,蔡记华..裂缝型漏失地层钻井液防漏堵漏数值模拟研究[J].钻探工程,2025,52(4):46-53,8.基金项目
国家自然科学基金"纳米颗粒钻井液离散元流固耦合模拟与页岩孔隙封堵机理研究"(编号:42002311) （编号:42002311）
