Synthesis and Evaluation of the Inhibitive Filter Loss Reducer AMSC

An inhibitive filter loss reducer AMSC was synthesized with AMPS, acrylamide, methacrylamidoxy ammonium chloride and potassium acrylate as raw materials. AMSC was synthesized for clay swelling inhibition and filter loss control. The reaction conditions were optimized with the response surface method, and the performance of AMSC was evaluated. Laboratory experiments showed that a percent swelling inhibition of 84.76% can be obtained using the AMSC synthesized at these conditions:molar ratio of the four raw materials=2：1：7：1, reaction temperature=50℃, monomer concentration=15%, initiator concentration=0.5%, reaction time=4 h. The inhibitive capacity of AMSC at temperatures less than 100℃ is equivalent to the similar commercial products presently available. An increase in the concentration of AMSC from 0.06% to 0.6% reduced the volume of clay in an water-clay mixture from 1.2 mL to 0.2 mL. AMSC also had good filtration control performance in water base drilling fluids; reducing the filter loss of most water base drilling fluids by 87%.