摘要
现场作业中,温度压力变化频繁,双封隔器与管柱承受巨大压差,导致完井管柱失效频发,威胁完井管柱力学完整性。为保障现场生产安全,根据双封隔器段完井管柱在多工况下的温度压力变化,考虑密闭环空流体的温度效应和油管的弹性变形对密闭环空流体压力的影响,建立了多工况下双封隔器密闭环空压力的计算模型,并对管柱的安全性进行了校核。研究结果表明:在生产、测试和生产工况下,双封隔器以及油管承受的压差小,不影响管柱完整性;在酸化工况下,双封隔器承受压差巨大,为79.74 MPa,此时管柱极易发生失效;建议在酸化工况下,合理控制酸化液流量,降低温度效应对管柱的影响。研究结果可为双封隔器管柱的井身结构设计与现场工艺实施提供参考。
In field operations,both packers and the string are subject to huge pressure differentials due to varying downhole temperature and pressure,leading to frequent failures of the completion string with double packer section,which may damage the mechanical integrity of the completion string.For purpose of operation safety,a model for calculating the pressure in the annulus confined by the double packers under multiple operating conditions was built depending on the changes in temperature and pressure of the completion string with double packer section under multiple operating conditions,and considering the temperature effect of the fluid in the confined annulus and the impact of the elastic deformation of the tubing on the pressure of the fluid in the confined annulus.Moreover,the safety of the string was verified.The findings indicate that under testing and production conditions,the packers and tubing have small pressure differentials,which does not affect the integrity of the string.However,under acidizing conditions,the packers suffer a significant pressure differential of 79.74 MPa,making the string highly prone to failure.It is recommended to control the flow rate of the acidizing fluid properly under acidizing conditions to reduce the temperature effect on the string.The study results have referential significance for the design and field implementation of casing program using a completion string with double packer section.
作者
周朗
龚浩
张林
周梓澄
黄顺潇
田璐
Zhou Lang;Gong Hao;Zhang Lin;Zhou Zicheng;Huang Shunxiao;Tian Lu(PetroChina Southwest Oil&Gas Field Company;Engineering Technology Research Institute,PetroChina Southwest Oil&Gas Field Company;Sichuan&Chongqing Shale Gas Directorate,PetroChina Southwest Oil&Gas Field Company;School of Mechanical Engineering,Southwest Petroleum University)
出处
《石油机械》
北大核心
2025年第3期18-24,共7页
China Petroleum Machinery
基金
中国石油天然气集团有限公司关键核心技术重大科技攻关项目“200℃&105 MPa抗硫井下安全阀及封隔器研制”(2021ZG11)
西南油气田分公司科技项目“蓬莱气区高温试油工作液沉降稳定性快速评价技术研究”(20230302-06)。
关键词
完井管柱
双封隔器
密闭环空
力学完整性
数学模型
completion string
double packer
confined annulus
mechanical integrity
mathematic model
