天然气与石油2024，Vol.42Issue(6)：114-120,7.DOI:10.3969/j.issn.1006-5539.2024.06.013
交变热载荷下水泥环界面胶结损伤行为研究
Study on the interface bonding damage behavior of cement sheath under alternating thermal load
摘要
Abstract
Offshore high-temperature and high-pressure wells frequently experience integrity failures due to changes in temperature and pressure,causing issues such as annular pressure and wellhead uplift.A full-scale"production casing-cement sheath-technical casing"combination experimental device is developed based on the typical wellbore structure of high temperature and high pressure wells.Tests on the cement sheath's interface bonding integrity were conducted under three different alternating thermal loads,comparing differences between small-scale and full-scale physical experimental results.The study elucidated the degradation behaviour and mechanism of the cement sheath interface bonding under alternating thermal loads.The results show that high temperature and alternating thermal loads have a significant negative impact on the bonding performance of the cement sheath interface,with the degree of failure increasing with higher temperatures and more frequent alternations.Before the bonding failure of the cement sheath interface,the alternating thermal load mainly damages the chemical bonding between the casing and cement sheath interface until detachment occurs,creating micro-annular gaps.The formation and expansion of micro-annular gaps are the main reasons for decreased interfacial friction.There are certain differences between small-scale and full-scale physical experimental results,which make it difficult to accurately describe the mechanical properties of the cement sheath interface under actual conditions.The research findings can provide a basis and reference for the design of cement slurry in well cementing for high-temperature and high-pressure wells,management of wellbore integrity,and prediction and management of wellhead uplift.关键词
交变热载荷/水泥环/界面胶结性能/界面脱离/微环隙Key words
Alternating thermal load/Cement sheath/Interface bonding performance/Interface debonding/Micro-annular gap引用本文复制引用
陈浩东,罗鸣,肖平,罗铸,周念涛,林元华..交变热载荷下水泥环界面胶结损伤行为研究[J].天然气与石油,2024,42(6):114-120,7.基金项目
中海石油(中国)有限公司"十四五"重大项目"海上超高温高压钻完井关键技术研究及示范应用"(KJGG2021-0800) （中国）
