摘要
冲击器是解决硬地层钻速慢难题的有效方法之一。现有冲击器在与钻头配合使用时,会增加钻头到稳定器之间的距离,从而降低常规定向钻具组合的理论造斜率和钻头侧向力,导致无法在钻井造斜段使用,对造斜能力的影响十分明显。为此,对井下冲击器的动力学进行了分析,设计了一种结构简单的内置钻头多维冲击器,建立了多维冲击器流体仿真模型,分析了钻井液排量和密度对多维冲击器性能的影响,并借助清水试验验证了工具的可靠性及理论分析的正确性。分析结果表明:随着排量的增加,冲击器的性能参数均呈增大趋势;随着钻井液密度的增加,冲击器的平均压耗、轴向冲击力及冲击扭矩也近乎呈线性增长趋势;各项理论计算结果与室内试验结果误差均不超过7%。所得结论可为内置钻头多维冲击器的优化及现场应用提供理论依据。
Impactor is one of the effective tools to address the problem of low rate of penetration(ROP)in hard formations.When the existing impactor is used together with the bit,it increases the distance between the bit and the stabilizer,thereby reducing the theoretical build-up rate of directional tool assembly and bit side force,which makes it impossible to be used in kick-off section,having a significant impact on the kick-off ability.In this paper,the dynamics of the downhole impactor were analyzed,and a multi-dimensional impactor built-in bit with simple structure was designed.Then,a fluid simulation model of the multi-dimensional impactor was built to analyze the influence of drilling fluid displacement and density on the performance of the impactor.Finally,a clean water test was conducted to verify the reliability of the tool and the correctness of theoretical analysis.The results show that as the displacement increases,the performance parameters of the impactor exhibit an increase trend.As the drilling fluid density increases,the average pressure loss,axial impact force and impact torque of the impactor also tend to increase in a nearly linear manner.The error between the theoretical calculation results and the laboratory test results does not exceed 7%.The conclusions provide a theoretical basis for the optimization and field application of multi-dimensional impactor built-in bit.
作者
李陈涛
冯超
王杰
梁福元
肖伟
夏成宇
钱利勤
Li Chentao;Feng Chao;Wang Jie;Liang Fuyuan;Xiao Wei;Xia Chengyu;Qian Liqin(School of Mechanical Engineering,Yangtze University;Gudao Oil Production Plant,Sinopec Shengli Oilfield Company;School of Automotive Studies,Tongji University)
出处
《石油机械》
北大核心
2024年第11期29-35,共7页
China Petroleum Machinery
基金
国家自然科学基金项目“深层致密坚硬质岩层高频射流多维冲击破岩机理及试验研究”(52204001)
湖北省重点研发计划项目“智能耐高温全旋转导向钻头及配套井眼控制技术研究”(2021BAA053)。
关键词
冲击器
内置钻头
性能参数
多维冲击
压力波动
仿真模型
impactor
built-in bit
performance parameter
multi-dimensional impact
pressure fluctuation
simulation model
