多轴交变载荷下套管长圆螺纹疲劳失效分析及寿命预测

doi:10.3969/j.issn.1006-6535.2021.03.026

特种油气藏 ›› 2021, Vol. 28 ›› Issue (3): 168-174.DOI: 10.3969/j.issn.1006-6535.2021.03.026

• 钻采工程 • 上一篇

多轴交变载荷下套管长圆螺纹疲劳失效分析及寿命预测

谢士远¹, 赵朝阳², 关志刚¹, 王宏峰³, 宋琳¹, 林铁军², 张强²

1.中国石油新疆油田分公司,新疆克拉玛依 834000;
2.西南石油大学油气藏地质及开发工程国家重点实验室,四川成都 610500;
3.中国石油玉门油田分公司,甘肃酒泉 735000

收稿日期:2020-11-11 修回日期:2021-04-06 出版日期:2021-06-25 发布日期:2022-02-16
作者简介:谢士远(1994—),男,助理工程师,2016年毕业于中国石油大学(北京)石油工程专业,2019年毕业于该校油气井工程专业,获硕士学位,现从事固井工艺技术研究工作。
基金资助:
国家自然科学基金“极端条件下气井管柱耦联振动力学行为与控制基础理论研究”(51974271);中国石油重大工程技术现场试验项目“准噶尔南缘和玛湖等重点地区优快钻完井技术集成与试验”(2019F-33)

Fatigue Failure Analysis and Fatigue Life Prediction of the Long Round Thread of the Casing Under Multi-axial Alternate Load

Xie Shiyuan¹, Zhao Chaoyang², Guan Zhigang¹, Wang Hongfeng³, Song Lin¹, Lin Tiejun², Zhang Qiang²

1. PetroChina Xinjiang Oilfield Company, Karamay, Xinjiang 834000, China;
2. State Key Laboratory of Oil and Gas Reservoir Geology and Exploration, Southwest Petroleum University, Chengdu, Sichuan 610500, China;
3. PetroChina Yumen Oilfield Company,Jiuquan, Gansu 735000, China

Received:2020-11-11 Revised:2021-04-06 Online:2021-06-25 Published:2022-02-16

摘要/Abstract

摘要： 在下套管以及压裂作业过程中,套管螺纹在多轴交变载荷作用下极易发生疲劳失效,影响施工进度。针对该问题,通过有限元方法,利用Abaqus软件建立套管长圆螺纹有限元模型,对上扣后套管螺纹在拉伸、压缩、内压力等多轴交变载荷作用下的应力、应变进行了分析,并基于Mises屈服准则的寿命评估法对套管螺纹在多轴交变载荷下的寿命进行计算。研究表明;在拉伸、压缩、内压力等多轴交变载荷作用下,套管螺纹上最大应力都出现在公扣大端5扣齿底处;在轴向拉伸、压缩交变载荷作用下螺纹疲劳寿命仅为1 298次,内压力为46、66、100 MPa时,螺纹疲劳寿命随内压力增加呈现递减趋势,分别为1 094、1 050、901次。该研究结果对致密油等非常规油田在压裂过程中套管螺纹失效分析具有参考意义。

关键词: 套管螺纹, 应力, 应变, 多轴交变载荷, 塑性变形, 疲劳寿命

Abstract: During casing running and fracturing, it is easy to cause fatigue failure to casing threads under multi-axial alternate loads, affecting the construction progress. To address this problem, a finite element model of long round thread of the casing was established by Abaqus software with finite element method, and an analysis was conducted on the stresses and strains of casing thread under multi-axial alternate loads such as tension, compression, and internal pressure after buckling, and the life of casing threads under multi-axial alternate load was calculated by the life assessment method based on the Mises yield criterion. It was found in the study that under the action of multi-axial alternate loads such as tension, compression, and internal pressure, the maximum stress on the casing thread acted at the bottom of the 5 teeth at the big end of the male buckle; under the action of alternate loads such as axial tension and compression, the fatigue life of the lower thread is only 1 298 times. When the internal pressure was 46, 66, and 100 MPa, the fatigue life of the thread was decreased with the increase of the internal pressure, 1 094, 1 050, and 901 times, respectively. The study results provide a reference for the analysis of casing thread failure during fracturing in tight oil and unconventional oilfields.

Key words: casing thread, stress, strain, multi-axial alternate load, plastic deformation, fatigue life

中图分类号:

TE256

谢士远, 赵朝阳, 关志刚, 王宏峰, 宋琳, 林铁军, 张强. 多轴交变载荷下套管长圆螺纹疲劳失效分析及寿命预测[J]. 特种油气藏, 2021, 28(3): 168-174.

Xie Shiyuan, Zhao Chaoyang, Guan Zhigang, Wang Hongfeng, Song Lin, Lin Tiejun, Zhang Qiang. Fatigue Failure Analysis and Fatigue Life Prediction of the Long Round Thread of the Casing Under Multi-axial Alternate Load[J]. Special Oil & Gas Reservoirs, 2021, 28(3): 168-174.

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多轴交变载荷下套管长圆螺纹疲劳失效分析及寿命预测

Fatigue Failure Analysis and Fatigue Life Prediction of the Long Round Thread of the Casing Under Multi-axial Alternate Load

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