摘要
针对深水固井水泥环所处的高温高压环境及复杂温度变化,研制了一套全尺寸高温高压水泥环密封完整性评价装置.基于此装置,利用气窜法测试了高温高压养护条件下的固井第一界面水力胶结强度,开展了水泥浆养护温度、养护时间以及温度变化等因素对固井第一界面水力胶结强度的影响实验.实验结果表明,水泥浆养护时间72 h时,随着养护温度的升高,水力胶结强度逐渐增加;水泥浆养护温度200℃时,随着养护时间的增加,固井第一界面水力胶结强度呈增加趋势,且养护时间达到5d时,水力胶结强度达到最大值,随后逐渐稳定;温度变化对固井第一界面水力胶结强度影响较大,随着温度的升高,水力胶结强度增大,反之,水力胶结强度减小.
According to the complex temperature variation in high temperature and high pressure(HTHP)deep water wells,a full-size HTHP experimental device is developed to evaluate the seal integrity of cement sheath.By the device,the hydraulic bonding strength(HBS)between casing and cement is measured and the effects of high temperature and its variation on the HBS are investigated.The results show that the HBS behaves differently to the different cement slurry curing time,different curing temperature and different temperature variation.With the increasing of curing temperature in the same curing time,the HBS increases gradually.While the HBS increases first and then inclines to stable value with the increasing of curing time in the same curing temperature.The temperature variation has significant effects on HBS.HBS increases obviously with the increase of temperature.This study will be a certain guideline for evaluating the sealing integrity of cement sheath in HTHP wells.
作者
张万栋
李炎军
吴江
杨玉豪
杨焕强
ZHANG WandonG;LI Yanjun;WU JianG;YANG Yuhao;YANG Huanqiang(CNOOC Zhanjiang Branch Zhanjiang,Guangdong524000,China;CollegeofPetroleum Engineering,Yangtze University,Jingzhou,Hubei,China)
出处
《钻采工艺》
CAS
北大核心
2019年第5期24-26,共3页
Drilling & Production Technology
基金
中海油重点攻关项目“莺琼盆地高温高压钻完井液、固井工艺研究与应用”(编号:CNOOC-KJ 135 ZDXM 24 LTD ZJ 02)
关键词
高温高压
水泥环
水力胶结强度
温度变化
HTHP
cement sheath
hydraulic bonding strength
temperature variation