摘要
岩屑清除所用工具大多为外置倒棱叶片式工具,需要辅以旋转钻杆才能完成清理作业,其清除效果受到工作条件的限制。为此,提出使用内外螺旋流道组合的液力式助流工具,并对其进行数值模拟分析。建立数值模型进行数值模拟,将岩屑在井筒环空内的体积分数分布云图及出口环空面上岩屑质量流量作为助流效果评价指标。评价结果显示,内外螺旋组合助流方式的效果为最优。当螺旋槽数量为3时,出口环空面上的岩屑质量流量达到0.126 kg s;当螺旋槽轴向长度为500 mm时,出口环空面上的岩屑质量流量为0.225 kg s,携岩能力提升了1倍;当螺旋槽导程为600 mm时,出口环空面上的岩屑质量流量为0.328 kg s,携岩能力提升了45.7%。此外,旋流后井筒中的岩屑堆积现象得到缓解。
Most of the cuttings removal tools proposed at home and abroad are external chamfered blades,which need drill pipe rotation to carry out cleaning operation with restrictions on the use of tools.In order to solve the above problems,a hydraulic flow aid tool with inner and outer spiral channels is put forward,and the numerical simulation analysis is carried out.By means of CFD numerical simulation,the volume fraction distribution nephogram of cuttings in the wellbore annulus and the cuttings mass flow value on the exit annulus surface are used as the evaluation indexes of the flow assistance effect.The evaluation results show that:firstly,it is verified that the effect of the internal and external spiral combination flow aid mode is the best.Secondly,when the number of spiral grooves is 3,the cuttings mass flow value on the outlet annulus surface reaches 0.126 kg s;when the spiral groove axis′length is 500 mm,the cuttings mass flow on the outlet annulus surface is 0.225 kg s,and the rock carrying capacity is doubled;when the spiral groove lead is 600 mm,the cuttings mass flow value on the outlet annulus surface is 0.328 kg s,and the rock carrying capacity is increased by 45.7%.After swirling,the cuttings accumulation in the wellbore is alleviated.
作者
赵佳乐
任连城
曾繁荣
冯子刚
李帅
ZHAO Jiale;REN Liancheng;ZENG Fanrong;FENG Zigang;LI Shuai(College of Mechanical and Power Engineering,Chongqing University of Science and Technology,Chongqing 401331,China)
出处
《重庆科技学院学报（自然科学版）》
CAS
2020年第6期103-107,共5页
Journal of Chongqing University of Science and Technology：Natural Sciences Edition
基金
重庆科技学院研究生科技创新项目“水平井泥浆助流器工作机理研究及结构优化”(YKJCX1920305)。
关键词
岩屑床
井眼清洁
液力助流工具
数值模拟
cuttings bed
borehole cleaning
hydraulic fluid aid tool
numerical simulation
