粉煤灰—矿渣低密度水泥浆体系研究与评价  

Research and Evaluation of Fly Ash-slag Low Density Cement Slurry System

作　　者：马如然 宗勇 闫振峰 张新傑 陈绪 MARu-ran;ZONG Yong;YAN Zhen-feng;ZHANG Xin-jie;CHEN Xu(Second Cement Branch Company,Bohai Drilling Engineering Company Limited,Petro China,Tianjin 300280,China)

机构地区：[1]中国石油渤海钻探第二固井公司,天津300280

出　　处：《西部探矿工程》2023年第10期34-37,共4页West-China Exploration Engineering

摘　　要：为提高长封固段固井及易漏失井固井质量,通过评价优选矿渣的级别、厂家及配比,研发新型的激活增强剂(硫酸盐与甲酸钙质量比为5∶1的复配体系),形成了一种粉煤灰—矿渣低密度水泥浆体系。通过考察低密度水泥浆的沉降稳定性、抗压强度、稠化、失水量等指标,得出矿渣粉的最佳加量为20%,硫酸盐与甲酸钙的配比为5∶1时水泥浆的性能最优,水泥浆在60℃、24h下抗压强度提升80.7%,达到11.2MPa,且低密度水泥浆体系的稠化时间、沉降稳定性和失水等性能均满足固井施工需求。现场应用5井次,固井质量均合格。In order to improve the quality of cementing and leaking wells in the long sealing and cementing section,as well as the grade,manufacturer and ratio of slag,a new type of activation enhancer developed(a compound system with a mass ratio of sulfate and Calcium formate of 5∶1)was evaluated and optimized,and finally a fly ash-slag low-density cement slurry system was formed.Through investigating the settlement stability,compressive strength,thickening,water loss and other indicators of low-density cement slurry,it is concluded that the optimal addition of slag powder is 20%,and the ratio of sulfate and Calcium formate is 5∶1,when the performance of cement slurry is optimal.The compressive strength of cement slurry increased by 80.7%at 60℃and 24 hours,reaching 11.2 MPa.The thickening time,settling stability,and water loss of the low-density cement slurry system all meet the requirements of cementing construction.Five well applications were conducted on site,and the cementing quality was all qualified.

关 键 词：粉煤灰 矿渣 低密度 强度 稳定性 

分 类 号：TE256[石油与天然气工程—油气井工程]