Preparation and Performance Evaluation of Well cementing Fluid Loss Additive by Dispersion Polymerization Method
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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