摘要
为了满足越来越苛刻的钻井工况的要求,全球各大钻具制造厂商不断开发出具有更优越性能的特殊螺纹钻杆接头,普遍增加了副台肩结构形成双台肩钻杆接头。但是面对超深井和特深井复杂工况,现有钻具接头的副台肩间隙是否满足要求至今未被关注。为此,通过建立具有不同副台肩间隙的双台肩钻杆接头三维弹塑性有限元模型,分析了副台肩间隙对接头应力分布特征和抗扭性能的影响,确定了适合特深井的双台肩钻杆接头合理副台肩间隙。研究结果表明:①不同轴向力(对应不同井深)工况条件下,副台肩间隙对双台肩钻杆接头主台肩、副台肩、螺纹牙的承载比例有着很大的影响;②大轴向力条件下主、副台肩的承载相对较小而螺纹牙的承载较大,减小副台肩间隙可有效降低螺纹牙承载比例;③所考察的NC50双台肩钻杆接头,当轴向力小于3000 kN(井深小于9000 m),建议副台肩间隙选择0.40 mm;④当轴向力大于3000 kN(井深大于9000 m),建议副台肩间隙选择0.20mm。结论认为,根据井深特点使用具有更合理副台肩间隙的双台肩钻杆接头,可以有效地提高接头的使用性能、降低接头失效风险。
In order to meet the requirements of more and more severe drilling conditions,the major drilling tool manufacturers all over the world continuously develop special thread tool joints with premium performance.In general,the structure of secondary shoulder is adopted to form a double-shoulder tool joint.However,it has not been concerned whether the secondary shoulder clearance of the existing tool joints can meet the requirements of the complex working conditions of ultra-deep wells and extra-deep wells.In this paper,a three-dimensional elastoplastic finite element model of a double-shoulder tool joint with different secondary shoulder clearances was established.Then,the influence of secondary shoulder clearance on the stress distribution and torsion performance of tool joints was analyzed.Finally,the secondary shoulder clearance of double-shoulder tool joints suitable for extra-deep wells was determined.And the following research results were obtained.First,under different axial loads(corresponding to different well depths),the secondary shoulder clearance has a great influence on the bearing ratio of primary shoulder,secondary shoulder and thread tooth of double-shoulder tool joints.Second,under the action of large axial force,the bearing capacity of primary shoulder and secondary shoulder are smaller while that of thread tooth is larger,and reducing the secondary shoulder clearance can effectively reduce the bearing ratio of thread tooth.Third,for the NC50 double-shoulder tool joint analyzed in this paper,it is suggested to set the secondary shoulder clearance at 0.40 mm when the axial force is less than 3000 kN(well depth is less than 9000 m).Fourth,it is suggested to set the secondary shoulder clearance at 0.20 mm when the axial force is more than 3000 kN(well depth is over 9000 m).In conclusion,selecting the double-shoulder tool joint with a rational secondary shoulder clearance according to well depth can effectively improve the application performance of joints and reduce failure risks.
作者
陈锋
朱巍
狄勤丰
王文昌
陈薇
王楠
CHEN Feng;ZHU Wei;DI Qinfeng;WANG Wenchang;CHEN Wei;WANG Nan(School of Mechatronics Engineering and Automation,Shanghai University,Shanghai 200072,China;Shanghai Institute of Applied Mathematics and Mechanics//School of Mechanics and Engineering Science,Shanghai University,Shanghai 200072,China)
出处
《天然气工业》
EI
CAS
CSCD
北大核心
2020年第7期90-96,共7页
Natural Gas Industry
基金
国家自然科学基金项目(编号:U1663205,51804194,51704191)
上海市重点学科建设项目(编号:S30106)
上海市部分地方院校能力建设项目(编号:12160500200)
上海市教育委员会(高峰学科建设项目)
上海市青年科技英才杨帆计划(编号:17YF1428000)。
关键词
钻杆接头
超深井
特深井
副台肩
间隙
应力分布
抗扭性能
Tool joint
Extra-deep well
Ultra-deep well
Secondary shoulder
Clearance
Stress distribution
Torsional behavior
