In view of the disadvantages of aqueous solution polymerization and inverse emulsion polymerization,herein we report for the first time preparation of a cementing fluid loss additive C-FL72L through dispersion polymerization,in which acrylamide(AM),2-acrylamido-2-methylpropanesulfonic acid(AMPS),fumaric acid(FA),N,N-dimethylacrylamide(DMA)are used as monomers,pentaerythritoltriallyl ether is used as crosslinker,and polyvinylpyrrolidone(PVP-K30)is used as stabilizer.The reaction kinetics of dispersed polymerization were investigated,and the conversion rate reached 98.9%after 4 hours of reaction.By means of infrared spectrum test,thermogravimetric analysis,high-performance liquid chromatography,gel permeation chromatography and other characterization methods,it is shown that all monomers are fully and completely polymerized,the temperature resistance of the fluid loss additive exceeds 300℃,and the molecular weight can reach 772,000.In the performance evaluation of cement slurry,fluid loss can be controlled within 40 mL at 150℃,and the engineering properties of cement slurry,such as rheological properties,thickening properties,and compressive strength,are excellent.The mechanism of the fluid loss additive is also discussed.The fluid loss additive C-FL72L has excellent application performance in functional cement slurry systems such as high-density,low-density,resin,latex,saline water,and has broad application prospects.
CementingOil well cementFluid loss additiveDispersion polymerizationControl fluid lossHigh temperature high pressure
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