Synthesis and performance evaluation of oil cement fluid loss additive FF-1

A new oil well cement fluid loss additive FF-1 was synthesized by using 2-acrylamido-2-methylpropane sulfonic acid(AMPS) and acrylamide(AM) as raw materials,by the water solution free radical copolymerization.The results of performance evaluation showed that when the dose of the monomer is 8% and the quality ratio between monomer is 1∶7,the initiator dose is 0.3% and the initiator mol ratio is 1∶1,the temperature is about 50℃,and the reaction time is around 6 hours,FF-1 is effective on decreasing fluid loss.The fluid loss can be reduced by 98.5% compared to pure cement slurry,and below 30mL when the temperature between 40℃ and 100℃.Even in saturated salt-water cement slurry FF-1 has a good performance.