有机硅-胺类抑制剂PKDAS的研制与性能评价

Preparation and performance evaluation of organosilicon-amine inhibitor PKDAS for drilling fluid

以N,N-二甲基丙烯酰胺(DMAA)、二甲基二烯丙基氯化铵(DMDAAC)和γ-(甲基丙烯酰氧)丙基三甲氧基硅烷(KH-570)为反应单体,以偶氮二异丁腈(AIBN)为引发剂,制备了抗高温有机硅-胺类抑制剂PKDAS,其最优合成条件为:n(DMAA)∶n(DMDAAC)∶n(KH-570)=10∶2∶1.5,引发剂加量0.2%,单体总浓度25%,反应时间9 h,反应温度70℃。通过红外光谱分析验证了PKDAS的分子结构,热重分析与扫描电镜的结果证明其不易发生高温降解。用抑制膨润土造浆、泥页岩线性膨胀与热滚回收实验,结果表明,PKDAS对于两者造浆均有着良好的抑制作用,且经220℃老化后亦能维持较强的抑制能力。

Choosing N,N- dimethylacrylamide（ DMAA） , dimethyl diallyl ammonium chloride （ DMDAAC ） and ＂ y-methacryloxypropyl trimethoxy silane （ KH-570 ） as reactive monomers, using azobisisobutyronitrile （AIBN） as initiator,silicone-amine inhibitor called PKDAS with high temperature resistance was synthe-sized. The optimized conditions for copolymerization were built as follows ： n （ DMAA ） ： n （ DMDAAC ）： n （ KH-570） = 10： 2：1.5 concentration of initiator 0. 2 % ,monomer concentration 2 5 % ,time 9 h,temper-ature 70 ℃. The feasibility of molecular structure design of PKDAS was proved by FTIR,the results of TAG and SEM showed that PKDAS has excellent thermal stability, PKDAS,s inhibition behavior was evaluated by inhibition test of mud making of bentonite, linear swelling and rolling recovery of mud shale. The results showed that PKDAS could effectively inhibit mud making of bentonite and mud shale, and maintained attenuation performance after thermal aging at 220 ℃ for 16 h.