Research and Application of Resin Cement Slurry in Workover and Plugging
When Well Integrity of oil and gas wells gets damaged,wellbore treatments are often con-ducted by workover and plugging.It requires cement slurry can resistance to downhole load failure and im-prove interlaminar sealing ability in order to prevent formation fluid interlayer channeling and wellhead pressure phenomenon.Aiming at the characteristics of disadvantages of conventional workover and plugging technology,resin was selected to the conventional cement slurry was modified by resin in order to meet the requirements of high strength,low Young's modulus and strong cementation ability of cement slurry.Tetrafunctional glycidyl epoxy with high viscosity and incompatibility with cement slurry was se-lected to solve the problem of incompatibility with cement slurry and complex on-site cleaning process which was modified by diluent.The acid anhydride curing agent and amine curing agent are used in combi-nation with best Ratio.The ratio of resin to curing agent was determined,so thickening time was adjusta-ble.It solved the problem that thickening time is difficult to control.The influence of different tempera-tures on the thickening performance and compressive strength of resin cement slurry was studied,and a high temperature resistant resin cement slurry system was formed.The bonding strength,permeability and elastic modulus of resin cement were evaluated through laboratory experiments.The high temperature resistant resin cement slurry system has strong temperature resistance of 130,high compressive strength and bonding strength,which can meet the technical requirements of workover and plugging operation.The epoxy resin cement slurry was succefully applicated.The application results show that the construction technology is simple It has high success rate,significant plugging effects and obvious advantages for high temperature workover and plugging operation in deep wells.
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