超深井小钻工具接头螺纹结构研制与应用

为适应塔里木油田深井和超深井勘探与开发的恶劣工况,同时针对其深井、超深井小钻工具的疲劳失效问题,研制了一种特殊螺纹（TMXT36）结构的超深井小钻工具,该特殊螺纹结构减少了每英寸的牙数,加长了外螺纹接头最末完全扣到外台肩的距离,比常规的螺纹多设计了3扣,减小其刚性,增加了弹性,从而提高其抗疲劳寿命（2.5倍）;该螺纹结构将扣根的最大应力转移到了接触面较宽的螺纹导向面上,降低了螺纹根部的疲劳缺口敏感系数（3.5）。该特殊螺纹与油田现有的NC38、TX60和TH90螺纹有限元对比分析得出：TMXT36的应力集中系数和其疲劳缺口敏感系数为最小,其抗疲劳寿命比其他螺纹接头提高了2.5倍,其试制成品在塔...

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Bibliographic Details
Published in石油钻采工艺 Vol. 38; no. 2; pp. 160 - 165
Main Author 练章华 梁红军 施太和 卢强 王延民 冯少波
Format Journal Article
LanguageChinese
Published 西南石油大学油气藏地质及开发工程国家重点实验室%中石油塔里木油田公司 2016
Subjects
TMXT36螺纹
小钻工具
有限元
疲劳缺口敏感系数
超深井
TMXT36螺纹
finite-element
super-deep well
超深井
有限元
miniature drilling tool
小钻工具
fatigue notch sensitivity coefficient
TMXT36 screw
疲劳缺口敏感系数
Online AccessGet full text
ISSN1000-7393
DOI10.13639/j.odpt.2016.02.006

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Summary:为适应塔里木油田深井和超深井勘探与开发的恶劣工况,同时针对其深井、超深井小钻工具的疲劳失效问题,研制了一种特殊螺纹（TMXT36）结构的超深井小钻工具,该特殊螺纹结构减少了每英寸的牙数,加长了外螺纹接头最末完全扣到外台肩的距离,比常规的螺纹多设计了3扣,减小其刚性,增加了弹性,从而提高其抗疲劳寿命（2.5倍）;该螺纹结构将扣根的最大应力转移到了接触面较宽的螺纹导向面上,降低了螺纹根部的疲劳缺口敏感系数（3.5）。该特殊螺纹与油田现有的NC38、TX60和TH90螺纹有限元对比分析得出：TMXT36的应力集中系数和其疲劳缺口敏感系数为最小,其抗疲劳寿命比其他螺纹接头提高了2.5倍,其试制成品在塔里木油田得到了应用和验证。
Bibliography:super-deep well; miniature drilling tool; TMXT36 screw; fatigue notch sensitivity coefficient; finite-element
13-1072/TE
LIAN Zhanghua1, LIANG Hongjun2, SHI Taihe1, LU Qiang2, WANG Yanmin2, FENG Shaobo2（1. State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Southwest Petroleum University, Chengdu, Sichuan 610500, China;2. PetroChina Tarim Oilfield Company, Korla, Xinjiang 841000, China）
A miniature drilling tool with special screw（TMXT36） structure was developed to cope with unfavorable exploration and development conditions in deep and super-deep wells in the Tarim Oilfield and to prevent fatigue failure of miniature drilling tool in such wells. The special screw has the number of teeth in every inch reduced, and the distance between the end of external screwed joint and the external shoulder increased. Moreover, with three threads more than conventional screws, the new screw has rigidity reduced and elasticity enhanced to promote the fatigue-resistant service life. The new screw structure c
ISSN:1000-7393
DOI:10.13639/j.odpt.2016.02.006