Mierostrueture Formation and Degradation Mechanism of Cementitious Plugging Agent Slurries

The hydration products and microstructure of class G oil well cement and a newly developed plugging agent （YLD） slurries cured in the simulated temperature and pressure environment, which was of similar temperature and pressure with those at the bottom of oil well in a normal depth, were investigate...

Full description

Saved in:
Bibliographic Details
Published in:Journal of Wuhan University of Technology. Materials science edition 2007, Vol.22 (1), p.61-65
Main Author: YAN Peiyu ZHOU Yongxiang YANG Zhenjie QIN Jian
Format: Article
Language:English
Subjects:
显微结构
水泥堵水剂
降解机制
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:The hydration products and microstructure of class G oil well cement and a newly developed plugging agent （YLD） slurries cured in the simulated temperature and pressure environment, which was of similar temperature and pressure with those at the bottom of oil well in a normal depth, were investigated using XRD, TG and SEM. Severe leakage is confirmed at the interface between hardened slurries and steel tube during the dynamically curing process, which induces the quick loss of cementing property of slurries. This should be the dominating cause of degradation of class G oil well cement slurry. A secondary hydration process can take place at the eroded interface of hardened YLD plugging agent slurry. Newly formed C-S-H gel has a self-healing effect to repair the damaged interface, which unceasingly maintains the cementing property of the YLD plugging agent slurry. Therefore, the effective using period of YLD plugging agent can be prolonged.
ISSN:1000-2413
1993-0437