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以2-丙烯酰胺基-2-甲基丙磺酸(AMPS)、丙烯酰胺(AM)和对苯乙烯磺酸钠(SSS)为聚合单体,采用反相乳液聚合法制备了一种水基钻井液降滤失剂PAAS,通过正交实验确定了最佳合成条件,采用FTIR及EA(元素分析)对其结构进行了表征,采用TG-DTG对其耐温性进行了分析。通过钻井液流变性、滤失性及抑制性实验对降滤失剂PAAS应用性能进行了考察,并对其降滤失机理进行了推测。结果表明:PAAS具备良好的高温稳定性,各类功能基团在温度升至225℃时均未发生明显的热分解现象;钻井液流变性实验、老化实验及失水实验表明:w(PAAS)=1.5%(以体系总质量计,下同)时,钻井液流变性良好,动塑比(YP/PV)=0.30 Pa/(m Pa·s),高温160℃老化前后失水量分别为8.4 mL和10.2 mL。功能基团含量渐变实验、SEM和横向弛豫时间(T_2)结果表明:该降滤失剂主要通过吸附作用改善钻井液体系抗滤失性能。
A series of water-based polymers were prepared by inverse emulsion polymerization using 2-acrylamido-2-methylpropanesulfonic acid (AMPS), acrylamide (AM) and sodium p-styrene sulfonate (SSS) The fluid loss control agent PAAS was used to determine the optimum synthesis conditions through orthogonal experiment. The structure was characterized by FTIR and EA, and the temperature tolerance was analyzed by TG-DTG. Through rheological, fluid loss and inhibition experiments of drilling fluid, the application performance of fluid loss control agent PAAS was investigated, and the mechanism of fluid loss control was also inferred. The results show that PAAS has good high temperature stability and no obvious thermal decomposition occurs when the temperature rises to 225 ℃. The rheological properties of drilling fluid, aging test and water loss test show that PAAS, (YP / PV) = 0.30 Pa / (m Pa · s), the water loss before and after aging at 160 ℃ is 8.4 mL and 10.2 mL. The results of graded experiment of functional group content and SEM and transverse relaxation time (T_2) show that the fluid loss control agent can improve the antifiltration performance of drilling fluid mainly through adsorption.