减轻剂颗粒特征对低密度固井水泥石-套管界面胶结性能的影响  

Influence of density reducer particle characteristics on bonding properties of low-density cement stone-casing interface

作　　者：武治强 张兴全 辛富斌 凌兴杰 黄志强[2] WU Zhiqiang;ZHANG Xingquan;XIN Fubin;LING Xingjie;HUANG Zhiqiang(CNOOC Research Institute Co.,Ltd.,Beijing 100028,China;College of Petroleum Engineering,Yangtze University,Wuhan 430100,China)

机构地区：[1]中海油研究总院有限责任公司,北京100028 [2]长江大学石油工程学院,湖北武汉430100

出　　处：《中国粉体技术》2025年第3期158-167,共10页China Powder Science and Technology

基　　金：国家重点研发计划项目,编号:2022YFC2806504;国家自然科学基金项目,编号:52274026;中海油科技项目,编号:KJGG-2022-17-04、KJGG-2022-17-05。

摘　　要：【目的】明晰不同减轻剂颗粒特征对海洋深水弱胶结地层低密度固井水泥石-套管固井界面胶结性能的影响。【方法】分析在水泥浆密度分别为1.5、1.7g/cm^(3)条件下,硅灰、粉煤灰及空心玻璃微珠3种常用减轻剂对低密度固井水泥石力学强度、体积收缩率以及水泥石-套管界面胶结强度的影响规律,采用X射线衍射、扫描电镜、压汞仪等分析减轻剂颗粒特征对水泥浆性能与界面胶结性能的影响机制。【结果】相同密度条件下,相较于硅灰和粉煤灰,采用空心玻璃微珠配制低密度水泥浆所需的水灰比更低,使得空心玻璃微珠减重水泥石的力学性能、抗体积收缩能力以及界面胶结强度更为优异,粉煤灰减重水泥石的界面胶结强度最低。【结论】采用空心玻璃微珠作为减轻剂能够优化水泥石孔隙结构,抑制化学体积收缩,同时与水化产物紧密胶结,使其与套管粘接牢固,更有利于保障海洋深水弱胶结地层的固井界面胶结质量。Objective To reduce the liquid column pressure in cement slurry and prevent formation rupture and loss,low-density cement slurry incorporating micro silicon,fly ash,and hollow glass microspheres is widely used in shallow deep-water cementing opera-tions in the South China Sea.Ensuring the quality of cementing and sealing under low temperatures and low-density conditions is a key technical issue in developing deep-water oil and gas resources in this region.However,there is a lack of in-depth research on the relationship between the particle characteristics of the density reducers and the cement stone-casing interface.Methods The study tested micro silicon low-density cement slurry with densities of 1.7 and 1.5 g/cm^(3),fly ash low-density cement slurry,hollow glass microspheres low-density cement slurry,and composite low-density cement slurry combining hollow glass microspheres with micro silicon and hollow glass microspheres with fly ash,both with densities of 1.5 g/cm^(3).The compres-sive strength,volume shrinkage rate,and cement stone-casing interface bonding strength were tested under the curing condi-tions of 15℃.The effects of different density reducers on the phase composition of the cement were analyzed using X-ray diffrac-tion(XRD).The microstructure and hydration product characteristics of the cement stone with different density reducers were observed using scanning electron microscopy(SEM).The porosity and pore size distribution of the cement stone were measured using mercury intrusion porosimetry(MIP).Results and Discussion Cement stone using hollow glass microspheres as a density reducer exhibited the highest compressive and interfacial bonding strengths.Both micro silicon cement and micro silicon-hollow glass microspheres cement demonstrated higher compressive and interfacial bonding strengths compared to fly ash cement.After 7 days of curing,the compressive strength of the 1.7 g/cm^(3) hollow glass microspheres cement stone was 18.54 MPa,with an interfacial bonding strength 61.5%higher than that o

关 键 词：弱胶结地层 低密度固井水泥浆 减轻剂 抗压强度 界面胶结性能 

分 类 号：TE256[石油与天然气工程—油气井工程] TB4[一般工业技术]