随钻震击器接头断裂分析及改进措施.pdf

第32卷第6期
2010
年
OI DRILLING &PRODUCTION TECHNOLOGY
Nov.2010
文章编号:1000-7393(2010)06-0121-04
随钻震击醫接头断裂分析及改进措施
潘志勇宋生印:王新虎黄永章2朱丽霞'李嫏
(1.中国石油集团石油管工程技术研究院,陕西西安710065;2.川庆轱探工程有限公司工程技术研宽院,陕西西安70021)
摘要:随钴震击器是一种重要的井下解卡エ具,由于其工作环境恶劣、受力状态复杂,震击器接头容易发生断裂。为提高
品质量,廷长接头的使用寿命,减少新裂事故的发生,需要对接头断裂原因进行分析并实施相应的改选。针对一起随钴震击
器上接头的断裂事故,采用试验与理论相结合的方法进行断裂原因分祈。对接头进行了宏观分析、尺す測量、无损检测、材质理
化性能检验(包指化学成分、力学性能和金相组织)》对钻具组合进行了重点分析,并对随钻震击器上接头和转换接头的弯曲
强度比进行详细计算。结果表明随钴震击器上接头发生断裂的原因是由于钻县组合不合理以及随钻震击器上接头和转換接头
的匹配不当导致的疲劳断裂、材料冲击韧性低进一步缩短了疲労寿命,最后提出了改进措施并取得了较好的效果
关健词:随钻震击器;接头;断裂;疲劳;失效分析;改进措施
中图分类号:TE921.2
文献标识码:A
Analysis on the fracture of drilling jars joint and improvement measures
PAN Zhiyong, SONG Shengyin, WANG Xinhu, HUANG Yongzhang, ZHU Lixia, LI Na
(1. Tubular Goods Reseach Center of CNPC, Xi'an 710065, China
2. CCD Changqing Engineering Technology Research Institute, Xi'an 710021, China
Abstract: Drilling jar is a essential stuck freeing device. Fracture may be happens to drilling jars joint because of bad working
conditions and complex load. Study on the fracture of driling jars joint and corresponding impro cment measures carried out on joint
can lift joint quality and prolong it's service life to rcducc fracture cases. Fracture failure research was carried through tests and theor
based on a fracture accident of a drilling jars top joint. Macroscopic analysis, dimension measurement and nondestructive testing were
done for failure drilling jar s top joint. The material, s chemical and physical properties(including chemical composition, mechanical
properties, metallography )were checked. The drilling strings assembly was analyzed specially and the bending strength ratio between
drilling jars top joint and adapter Joint was calculated detailedly. The results show that the drilling jars top joint is broken by virtue ot
fatigue induced by irrational drilling strings assembly and improper matching between drilling jars top Joint and adapter joint. The joint
fatiguc life was reduced further owing to matcrials impact toughness less than standard valuc. The improvements were made at the end
of this passage and good results had been obtained
Key words: drilling jar; joint; fracture;, fatigue; failure analysis; improvement measures
随钻震击器是简单、迅速处理井下卡钴事故必拉、压、弯、扭综合交变应力作用,而且在解卡过程中
不可少的钻井工具。随钻震击器两端通常与钻铤连还要承受很大的振动和冲击231。为延长随钻震击
接,当出现卡钴事故时,震击器开始T作,其依靠突器的使用寿命和避免失效事故的发生,很多学者从
然的弹性恢复释放能量来产生震击,一般需要多材料、结构和受力等方面进行了研究49,但油田现
次甚至儿百次的震击オ能达到解卡的目的。所以随场随钻震击器断裂事故仍时有发生。笔者以油田现
钻震击器受力复杂,不仅要承受正常钻进过程中的场发生的断裂事故为研究对象,分析随钻震击器失
作者简介:潘志勇,1976年生、2006年毕业于中国石油大学(北京)并获硕士学位,现主要从事石油管方面的研究工作和技术服务。电话
029-88726009E-mail:py3408c163.com