预弯曲连续油管及其疲劳寿命预测

doi:10.7623/syxb201204026

石油学报 ›› 2012, Vol. 33 ›› Issue (4): 706-710.DOI: 10.7623/syxb201204026

预弯曲连续油管及其疲劳寿命预测

李子丰　李雪娇　王　鹏

燕山大学石油工程研究　河北秦皇岛　066004

收稿日期:2011-12-02 修回日期:2012-03-15 出版日期:2012-07-25 发布日期:2012-08-01
通讯作者: 李子丰
作者简介:李子丰，男，1962年7月生，1992年获中国石油大学（北京）博士学位，现为燕山大学石油工程研究所教授、博士生导师，主要研究方向为油气田开发工程、油气井工程及油气井杆管柱力学。
基金资助:
东北石油大学提高油气采收率教育部重点实验室开放基金项目(DYKFJJ 2010-6)资助。

Pre-bending coiled tubing and its fatigue life prediction

LI Zifeng　LI Xuejiao　WANG Peng

Received:2011-12-02 Revised:2012-03-15 Online:2012-07-25 Published:2012-08-01

摘要/Abstract

摘要：

介绍了一种提高连续油管疲劳寿命的新技术——预弯曲连续油管技术,对预弯曲连续油管进行了受力分析和强度校核,分析了现场作业过程中预弯曲连续油管应力循环特征。在对称循环和脉动循环下的疲劳实验数据基础上,用拟合法和插值法建立了任意循环下预弯曲连续油管的疲劳寿命预测模型,简单对比了预弯曲连续油管和直连续油管的疲劳寿命。初步计算表明:预弯曲连续油管技术可以成倍地提高连续油管的疲劳寿命。

关键词: 连续油管, 疲劳寿命, 力学分析, 预弯曲, 拟合法, 插值法

Abstract:

Coiled tubing is widely used in oil drilling and production operations, however, the extremely strong stress variation of coiled tubing during processes of pulling out, rolling in the reel and passing through the gooseneck make coiled tubing fatigue easily. Thus, it is of great importance to increase the coiled-tubing fatigue life. We introduced a new technique capable of improving the fatigue life of coiled tubing, i.e. the pre-bending coiled tubing technique, made a mechanical analysis and strength check of the pre-bending coiled tubing, and characterized its stress cycling in field operations. Based on data of fatigue tests under the symmetric and pulsating cycles, we established a prediction model of the pre-bending coiled-tubing fatigue life under an arbitrary cycle with fitting and interpolation methods, and simply compared the fatigue life of the pre-bending coiled tubing with the conventional straight coiled tubing. Preliminary calculations showed that the fatigue life of coiled tubing would be multiplied several times by applying the pre-bending coiled tubing technique.

Key words: coiled tubing, fatigue life, mechanical analysis, pre-bending, fitting method, interpolation method

李子丰　李雪娇　王　鹏. 预弯曲连续油管及其疲劳寿命预测[J]. 石油学报, 2012, 33(4): 706-710.

LI Zifeng　LI Xuejiao　WANG Peng. Pre-bending coiled tubing and its fatigue life prediction[J]. Editorial office of ACTA PETROLEI SINICA, 2012, 33(4): 706-710.

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预弯曲连续油管及其疲劳寿命预测

Pre-bending coiled tubing and its fatigue life prediction

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