超深水平井钻柱动力学研究及强度校核

doi:10.11885/j.issn.1674-5086.2019.11.18.02

西南石油大学学报(自然科学版) ›› 2020, Vol. 42 ›› Issue (4): 135-143.DOI: 10.11885/j.issn.1674-5086.2019.11.18.02

超深水平井钻柱动力学研究及强度校核

钟文建¹, 李双贵¹, 熊宇楼², 付建红², 苏昱²

1. 中国石化西北油田分公司石油工程技术研究院, 新疆乌鲁木齐 830011;
2. 油气藏地质及开发工程国家重点实验室·西南石油大学, 四川成都 610500

收稿日期:2019-11-18 出版日期:2020-08-10 发布日期:2020-08-10
通讯作者: 钟文建,E-mail:zhongwj.xbsj@sinopec.com
作者简介:钟文建,1983年生,男,汉族,湖北天门人,工程师,主要从事钻井工艺优化与设计工作。E-mail:zhongwj.xbsj@sinopec.com;李双贵,1979年生,男,汉族,四川合江人,高级工程师,主要从事钻井技术工作。E-mail:lisg.xbsj@sinopec.com;熊宇楼,1994年生,男,汉族,四川眉山人,硕士研究生,主要从事油气井工程力学方面的研究工作。E-mail:1208939245@qq.com;付建红,1964年生,男,汉族,四川成都人,教授,博士生导师,主要从事油气井工程方面的教学与研究。E-mail:fujianhong@126.com;苏昱,1990年生,男,汉族,湖南新化人,博士研究生,主要从事井筒多相流和流体热力学方面的研究。E-mail:498450538@qq.com

The Dynamics Characteristics and Strength Check of Drilling String in Ultra-deep Horizontal Well

ZHONG Wenjian¹, LI Shuanggui¹, XIONG Yulou², FU Jianhong², SU Yu²

1. Petroleum Engineering Technology Research Institute, SINOPEC Northwest Oilfield Company, Urumqi, Xinjiang 830011, China;
2. State Key Laboratory of Oil&Gas Reservoir Geology and Exploitation, Southwest Petroleum University, Chengdu, Sichuan 610500, China

Received:2019-11-18 Online:2020-08-10 Published:2020-08-10

摘要/Abstract

摘要： 超深井钻井过程中钻具失效事故频繁发生，钻柱动力学特性研究对增加钻具安全性具有重要作用。考虑真实井眼轨迹、钻头与地层相互作用、钻柱与井壁接触及钻井液黏滞作用等因素的影响，建立了全井钻柱动力学特性仿真模型，模拟了不同钻压及转速下钻柱不同截面轴向力、扭矩、位移及等效应力等随时间的变化，采用第四强度理论计算了井口钻具的安全系数，校核了超深水平井钻具强度。分析结果表明，井口轴向力和等效应力表现为低频变化，MWD处等效应力和加速度表现为高频振动且其横向振动比轴向振动更加剧烈；在钻压和转速较小的情况下，钻压和转速对井口轴向载荷、井口扭矩、井口等效应力及井口安全系数影响不大；MWD处等效应力随钻压的增加而增大，其横向加速度随转速的增加幅值显著增大；对于井深超过8 000 m、井眼尺寸φ120.65 mm及φ114.3 mm的G105钻杆，动力学分析得到的井口安全系数大部分时间内在1.2附近波动，钻具总体是安全的。

关键词: 超深水平井, 钻具失效, 钻柱动力学, 强度校核, 安全系数

Abstract: Drilling tools failure of occurs frequently in the process of ultra-deep well drilling. Therefore, the research on the dynamic characteristics of drilling string plays an important role in the safety of drilling tools. Considering the influence of the real well trajectory, the interaction between bit and formation, the contact between drilling string and borehole wall and the viscous effect of drilling fluid, a simulation model of the whole well drilling string with dynamic characteristics is established. Under different WOB and rotation speed, the changes of axial force, torque, displacement and equivalent stress over time are simulated. The fourth strength theory is used to calculate the assurance coefficient of the wellhead drilling tools and check the strength of the drilling tools in ultra-deep horizontal wells. The results show that the wellhead axial force and equivalent stress display a characteristics of low-frequency change, while the equivalent stress and acceleration at MWD are high-frequency vibration, and the lateral vibration is more severe than the axial vibration; when WOB and rotation speed are small, WOB and rotation speed have little influence on the wellhead axial load, torque, equivalent stress and assurance coefficient; the equivalent stress at MWD increases with the increase of WOB, and the amplitude of lateral acceleration increases significantly with the increase of rotation speed. When the well depth is more than 8 000 m, the hole size is φ120.65mm, and G105 φ114.3 mm drill pipe is used at the wellhead, the wellhead assurance coefficient obtained from dynamic analysis will fluctuate around 1.2, so generally the drilling tool is safe.

Key words: ultra-deep horizontal well, drilling tool failure, drilling string dynamics, strength check, assurance coefficient

中图分类号:

TE243

钟文建, 李双贵, 熊宇楼, 付建红, 苏昱. 超深水平井钻柱动力学研究及强度校核[J]. 西南石油大学学报(自然科学版), 2020, 42(4): 135-143.

ZHONG Wenjian, LI Shuanggui, XIONG Yulou, FU Jianhong, SU Yu. The Dynamics Characteristics and Strength Check of Drilling String in Ultra-deep Horizontal Well[J]. 西南石油大学学报(自然科学版), 2020, 42(4): 135-143.

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超深水平井钻柱动力学研究及强度校核

The Dynamics Characteristics and Strength Check of Drilling String in Ultra-deep Horizontal Well

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