Abnormal gelation phenomenon of Class G oil well cement incorporating polycarboxylic additives and its countermeasures

作者：Chen, Di; Guo, Jintang^*; Xia, Xiujian; Yu, Yongjin; Jin, Jianzhou; Xu, Ming; Liu, Shuoqiong; Feng, Yakai

来源：Construction and Building Materials, 2017, 149: 279-288.

DOI：10.1016/j.conbuildmat.2017.05.062

• Abnormal gelation phenomenon
• Polycarboxylic additive
• Oil well cement
• Solution methods
• Cementing

Cementing security is endangered by the abnormal gelation phenomenon of cement slurry incorporating polycarboxylic additives occurred around 120 degrees C. The differences between gelatinous and non-gelatinous sections were investigated through various techniques. The polymer structural change around 120 degrees C could explain the abnormal gelation phenomenon by viscosity-temperature characterization. The other reasons are the polycarboxylic additives combine with Ca2+, SiO42- and aluminate hydrate by cross linking reaction. The cross-linking structure developed flocs which was embedded in calcium silicate hydrate (C-S-H) gel and intertwined around stirring shaft. The practicable methods were proposed to relieve or solve the abnormal phenomenon of cement slurry.

• 出版日期2017-9-15
• 单位天津大学