天然气勘探与开发2025，Vol.48Issue(4)：80-89,10.DOI:10.12055/gaskk.issn.1673-3177.2025.04.008
失返性漏失地层高注高挤注水泥堵漏技术
High-injection and high-squeeze cementing plug technology for lost-return formations
摘要
Abstract
In the process of oil and gas well drilling in the Sichuan-Chongqing area,the presence of lost-return formations often result in unsuccessful plugging,even drilling accidents.To address the problem,a method for calculating two key parameters,namely the running depth of cementing tool and the sinking height of cement plug,was developed on the basis of the pressure balance principle.Additionally,the slurry design criteria were improved and the operation workflow was optimized,thus forming an integrated high-injection and high-squeeze cementing plug technology.Research results indicate that,(i)the density of plugging slurry is equal to that of drilling fluid,ensuring the slurry retention in wellbore as well as the success rate of cementing plug;(ii)the calculated running depth can not only quantitatively control the length of cement plug,but also ensure the safety of drilling tool;(iii)the adoption of bradenhead squeeze effectively directs the slurry flowing to the thief zone,increasing the success rate of plugging;(iv)staged squeezing the gelling cement into formation at the initial setting time effectively enhances the pressure-bearing capacity of formation;and(v)this technology has been applied in 33 wells,achieving the success rate of one-trip plugging of 90.9%,and statistical results of 7 wells show that the average pressure-bearing capacity per well is increased by 31.4%.In conclusion,the high-injection and high-squeeze cementing plug technology demonstrates remarkable effectiveness in sealing the lost-return formations in the Sichuan-Chongqing area,and can realize safe plugging while improving the formation pressure-bearing capacity in a single operation.It provides a technical guarantee for efficient drilling and safe production.关键词
井漏失返/注水泥堵漏/提承压/分段憋挤/压力平衡/初凝时间/液柱压力/水泥下沉Key words
Lost return/Cementing plug/Pressure-bearing capacity improvement/Staged squeeze/Pressure balance/Initial setting time/Liquid column pressure/Cement sinking分类
能源科技引用本文复制引用
张何东,陈敏华,张华,孙斌,张呈星..失返性漏失地层高注高挤注水泥堵漏技术[J].天然气勘探与开发,2025,48(4):80-89,10.基金项目
中国石油西南油气田公司科研项目"川中地区多层系井工程提速提产关键技术研究及应用"(编号:2025D0020101). （编号:2025D0020101）
