Study on the effect of polyanionic cellulose on the properties of cement slurry in Sichuan-Chongqing region
In response to the current unclear mechanism of contact pollution between drilling fluid and cement slurry and the need to improve the high-temperature isolation liquid system,the influence of drilling fluid treatment agent polyanionic cellulose(PAC)on the structure and performance of cement slurry is studied to investigate the contact pollution mechanism.The research results show that with the increase of PAC dosage,the rheological properties of cement slurry deteriorate,and the compressive strength of cement slurry solidified body decreases.PAC can undergo chemical reactions with metal ions such as Al3+ and Ca2+,forming a cross-linked network structure that adsorbs on the surface of cement particles,preventing the hydration reaction between unhydrated cement particles and water,and delaying the hydration rate.The cross-linked PAC network film structure utilizes intermolecular forces to bind the free water present in the cement slurry within the network structure,reducing the free water content in the cement slurry and affecting its rheological properties.The above effects of polymer treatment agent such as PAC may be the main cause of contact pollution between drilling fluid and cement slurry.This study can provide theoretical guidance for the selection of high-efficiency isolation fluids in the Sichuan-Chongqing region.
NETL
NSTL
万方数据
维普
