[1]孙等军,李培梅,张军,等.开窗侧钻加重钻杆外螺纹断裂原因分析[J].石油管材与仪器,2020,6(03):42-46.[doi:10.19459/j.cnki.61-1500/te.2020.03.011]
 SUN Dengjun,LI Peimei,ZHANG Jun,et al.Fracture Analysis of External Thread of Heavy Weight Drill Pipe for Sidetracking[J].Petroleum Tubular Goods & Instruments,2020,6(03):42-46.[doi:10.19459/j.cnki.61-1500/te.2020.03.011]
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开窗侧钻加重钻杆外螺纹断裂原因分析
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《石油管材与仪器》[ISSN:2096-0077/CN:61-1500/TE]

卷:
6
期数:
2020年03期
页码:
42-46
栏目:
失效分析与预防
出版日期:
2020-06-20

文章信息/Info

Title:
Fracture Analysis of External Thread of Heavy Weight Drill Pipe for Sidetracking
文章编号:
2096-0077(2020)03--0042-05
作者:
孙等军李培梅张军李勇
中国石油集团川庆钻探工程有限公司长庆钻井总公司 陕西 西安 710018
Author(s):
SUN Dengjun LI Peimei ZHANG Jun LI Yong
CCDC Changqing General Drilling Company, Xi′an, Shaanxi 710018, China
关键词:
加重钻杆断裂疲劳损伤
Keywords:
heavy weight drill pipe fracture fatigue damage
分类号:
TE921.2
DOI:
10.19459/j.cnki.61-1500/te.2020.03.011
文献标志码:
A
摘要:
对陕北区域5 1/2″套管内开窗侧钻井所用的 88.9 mm×CQST31加重钻杆出现外螺纹断裂事故进行分析。对其失效原因进行检查后发现该批加重钻杆外螺纹根部存在疲劳裂纹,因侧钻井起始井段狗腿度较大,钻进过程中,加重钻杆通过该井段,承受较大的交变弯曲载荷,外螺纹接头产生疲劳损伤;下放钻具时,加重钻杆发生屈曲,导致加重钻杆快速疲劳损伤而断裂。
Abstract:
The external thread fracture of 88.9 mm×CQST31 heavy weight drill pipe used for sidetracking in 5 1/2″ casing in Northern Shaanxi was analyzed. After checking the failure causes, it is found that there is fatigue crack at the root of external thread of this batch of heavy weight drill pipes. The dogleg degree of the initial well section of side drilling is relatively large, therefore the heavy weight drill pipe passing through this well section bears a large alternating bending load during drilling, and the external thread joint is fatigued. Furthermore, when lowering the drill pipe, the heavy weight drill pipe buckles, resulting in rapid fatigue damage and fracture.

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备注/Memo

备注/Memo:
第一作者简介:孙等军,女,1972年生,1992年毕业于长庆石油学校矿场机械专业,现主要从事钻具技术管理工作。E-mail:zjsgsdj@cnpc.com.cm
更新日期/Last Update: 2020-06-25