摘要：Engineering practices show that installation of oscillators on drillstring can effectively reduce the axial drag and inhibit stick-slip vibration in horizontal drilling. However, the mechanisms of axial drag reduction and stick-slip vibration inhibition of oscillators have not been fully revealed, and there is a lack of effective optimization design methods of vibration parameters. To solve the above problems, the mechanical models of drillstring with drag reduction oscillators are firstly built, which include axial vibration model in sliding drilling mode and stick-slip vibration model in rotary drilling mode. The nonlinear relationship between friction force and velocity is considered in the mechanical models. Next step, the optimal design models of vibration parameters are estab-lished, in which the drag reduction efficiency and the stick-slip reduction efficiency are taken as the objective functions respectively, and drillstring fatigue, hydraulic loss and so on are the constraint conditions.The optimal design models are solved with orthogonal experimental design. Finally, the above models are applied to hori-zontal drilling engineering in Chinese Jimsar oilfield. The results show that oscillators can significantly reduce the total friction forces on drillstring and keep a more stable weight on bit (WOB) in sliding drilling mode, and inhibit the stick-slip vibration of drillstring and fluc-tuation amplitude of WOB. The primary factors affecting the drag reduction efficiency in sliding drilling mode are vibration amplitude and number of oscillators, whereas the primary factors affecting stick-slip reduction efficiency in rotary drilling mode are rotary speed of drillstring and WOB. It is recommended to install 3 os-cillators on bottom hole assembly of drillstring with vibration amplitude of 40 kN, rotary speed of 162 r/min, and the average WOB of 171 kN in case study, and then the drag reduction efficiency and the stick-slip reduction efficiency are respectively 37.47% and 74%.

关键字：Horizontal drilling; Drill string; Drag reduction oscillator; Stick -slip vibration; Optimal design

ISSN号：2949-8929

卷、期、页：卷: 224

发表日期：2023-05-01

期刊分区（SCI为中科院分区）：二区

收录情况：SCI（科学引文索引印刷版）,EI（工程索引）,SCIE（科学引文索引网络版）

发表期刊名称：GEOENERGY SCIENCE AND ENGINEERING

通讯作者：石小磊

第一作者：黄文君,高德利

论文类型：期刊论文

论文概要：石小磊,黄文君,高德利，Mechanical models of drillstrings with drag reduction oscillators and optimal design methods of vibration parameters in horizontal drilling，GEOENERGY SCIENCE AND ENGINEERING，2023，卷: 224

论文题目：Mechanical models of drillstrings with drag reduction oscillators and optimal design methods of vibration parameters in horizontal drilling