钻井液与完井液2024，Vol.41Issue(3)：390-395,6.DOI:10.12358/j.issn.1001-5620.2024.03.015
长裸眼恶性漏失井双重防漏固井技术
Dual Prevention of Severe Losses of Cement Slurries in Cementing Long Open Holes
摘要
Abstract
Aiming at the cementing problem of long open hole malignant leakage wells,the thermo-sensitive shape memory loss prevention spacer and foam leakage prevention cement slurry were developed,which synergistically reduce the cementing loss risk of long open hole malignant leakage loss wells.The thermo-sensitive shape memory material was developed,which resistance temperature is 150℃and deformation memory temperature is 80～110℃,the length of thermo-sensitive shape memory mesh particles after deformation is 10 times that of normal temperature,and the diameter of shape memory expansion ball after expansion is 3 times that of normal temperature.The thermo-sensitive leak-proof spacer was developed,and the bearing-capacity of 3mm crack can reach 8.5MPa.Foaming agent and foam stabilizer were selected,and foam cement slurry were developed,and the density can be adjusted from 1.12 to 1.31 g/cm3,the difference between the upper and lower parts was less than 0.01 g/cm3,and the compressive strength of 1.12 g/cm3 foamed cement stone can reach 6.6 MPa at 30℃/72 h,and bubbles in set cement are uniformly dispersed.The spacer duration design method that considering the equivalent plugging time and washing efficiency was established,and the foamed cement slurry section constant gas injection method was formed.Based on thermo-sensitive anti-leakage spacer and foam cement slurry,The leak-proof cementing technology has been applied for 2 Wells,and the one-time sealing section length exceeds 4000 m,and the spacer and cement slurry returned to the surface successfully and got good results.关键词
泡沫水泥浆/温敏形状记忆材料/防漏隔离液/固井Key words
Foam cement slurry/Temperature-sensitive shape-memorable material/Leak-proof spacer/Well cementing分类
能源科技引用本文复制引用
高元..长裸眼恶性漏失井双重防漏固井技术[J].钻井液与完井液,2024,41(3):390-395,6.基金项目
国家自然科学基金"复杂环境下水泥环全生命周期密封理论与控制方法"(U22B6003). （U22B6003）
