摘要
封隔器卡瓦与套管的锚定效果直接影响到封隔器的坐封性能。当卡瓦嵌入套管时,会在套管接触面上形成咬痕,过大的嵌入深度有可能导致套管损坏、失效。为了确保卡瓦能起到良好的固定封隔器的作用,并且减少其对套管的损伤,采用滑移线理论、有限元法及与试验相结合的方法,研究了卡瓦锚定过程中的力学行为,计算了卡瓦嵌入套管的深度,并分析了卡瓦牙型角、倾角、内锥角及轴向载荷对锚定情况的影响,优选了结构参数。研究结果表明:①卡瓦齿面接触各齿的应力分布不均,会产生应力集中;②卡瓦牙应力随着齿数的增加而逐渐减小;③卡瓦牙嵌入套管的深度随载荷的增加而增加,随着齿数的增加逐渐减小;④在相同载荷下,卡瓦嵌入套管的深度随牙型角和内锥角的增大而减小,随倾角的增大而增大;⑤通过高温高压下的封隔器卡瓦锚定和坐封实验,套管上的卡瓦最大嵌入深度介于0.40~0.45 mm。结论认为,实验结果与有限元模拟结果吻合较好,由此证明了设计和分析的正确性和可靠性。
The setting performance of a packer is directly affected by the anchoring effect of a packer slip on the casing.When the slip is embedded into the casing,bite marks can be formed on the casing contact surface,and excessive embedded depth may lead to casing damage and failure.To ensure that slips perform a good packer fixing function while reducing the damage to the casing,this paper adopted the slip line theory,finite element analysis method and experimental method to study the mechanical behavior of slips in the process of anchoring and calculated the embedded depth of the slip in the casing.In addition,influences of slip thread angle,inclination angle,inner cone angle and axial load on the anchoring were analyzed,and structural parameters were optimized.And the following research results were obtained.First,the stress distribution on the casing contact surface is uneven,which results in stress concentration.Second,the stress of slip tooth decreases gradually as the number of teeth increases.Third,the embedded depth of the slip tooth in the casing increases with the increase of load,but decreases gradually with the increase of the number of teeth.Fourth,under the same load,the embedded depth of the slip in the casing decreases with the increase of thread angle and inner cone angle,but increases with the increase of inclination angle.Fifth,slip anchoring and packer setting experiment under high temperature and high pressure shows that the maximum embedded depth of the slip in the casing is between 0.40 mm and 0.45 mm.In conclusion,experimental results and finite element simulation results are better consistent,which verifies the correctness and reliability of the design and analysis.
作者
韩传军
彭雪峰
李林涛
HAN Chuanjun;PENG Xuefeng;LI Lintao(Key Laboratory of Oil and Gas Equipment,Ministry of Education//Southwest Petroleum University,Chengdu,Sichuan 610500,China;Sinopec Northwest Oilfield Company,Urumqi,Xinjiang 830011,China)
出处
《天然气工业》
EI
CAS
CSCD
北大核心
2020年第7期76-82,共7页
Natural Gas Industry
基金
国家重点研发计划课题“双层连续管双梯度钻井举升系统研发”(编号:2018YFC0310201)。
关键词
封隔器
卡瓦
弹塑性
接触
损伤
嵌入深度
应力集中
高温高压
Packer
Slip
Elastoplastic
Contact
Damage
Embedded depth
Stress concentration
High temperature and high pressure
