抑制型降滤失剂AMSC的合成与应用

针对水基钻井液长期存在黏土膨胀、钻井液滤失量大等问题，以2-丙烯酰胺-2-甲基丙磺酸、丙烯酰胺、甲基丙烯酰胺氧基氯化铵及丙烯酸钾为原料合成了一种抑制型降滤失剂AMSC，用响应面法优化了反应条件，并对AMSC的黏土膨胀抑制性和降滤失性能进行了评价。结果表明:在原料单体质量比为2:1:7:1、温度为50℃、单体浓度为15%、引发剂浓度为0.5%、反应4 h时，AMSC防膨率达到84.76%。在100℃以内，AMSC的抑制性与市场同类型抑制剂相比效果相当，同时该抑制剂对钻井液和水泥浆有较好的降滤失效果。应用添加AMSC的缓速酸体系在遭受钻井液污染的碳酸盐岩区块进行了洗井作业，储层岩心的渗透率恢复率达到87%，提高了产能。 

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%.