Using 2-acrylamido-2-methylpropanesulfonic acid(AMPS),N,N-dimethylacrylamide(DMAA),maleic anhydride(MA)and sodium methacrylsulfonate(SMAS)as raw materials,ADMS,a high-temperature and salt resistant quaternary copolymer powder fluid loss agent,is synthesized through inverse emulsion polymerization method by adding non-ionic emulsifiers including iso-tridecanol polyoxyethylene ether and span 80.The structure and thermal stability of the copolymer are characterized by means of FT-IR,NMR,TG and GPC,and the performance of ADMS is evaluated.It is indicated by the results that all four kinds of functional monomers involve in the reaction.The weight average molecular weight of ADMS reaches 448 198.ADMS can stand by high temperature as high as 320℃,and can be used in 30-200℃.At 200℃,the water loss of fresh water-based cement slurry with 3％ADMS is 48 mL.ADMS exhibits a good salt resistance.The water loss can be controlled within 50 mL by adding 4％and 5％ADMS to semi-saturated salt water and saturated salt water based cement slurry,respectively.ADMS has no adverse effect on the thickening time of cement slurry and the compressive strength of cement stone.
关键词
固井/反相乳液聚合/抗高温/耐盐/粉体/降失水剂
Key words
well cementing/inverse emulsion polymerization/high temperature resistance/salt resistance/powder/fluid loss reducer
维普
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