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以丙烯酰胺(AM)、2-丙烯酰胺基-2-甲基丙磺酸(AMPS)、丙烯酸(AA)和二烯丙基二甲基氯化铵(DMDAAC)为聚合单体,过硫酸铵-亚硫酸氢钠为氧化还原引发体系,通过水溶液聚合得到一种新型抗盐、抗高温、强抑制钻井液降滤失剂SN-K。通过单因素实验确定了最佳单体配比n(AM)∶n(AMPS)∶n(AA)∶n(DMDAAC)=1∶2∶2∶1,反应温度65℃,反应时间4 h,w(单体)=20%(以水溶液的总质量计,下同),w(引发剂)=0.5%(以单体总质量为基准,下同)。采用KOH调节聚合体系pH,引入强抑制性离子K+,并对SN-K进行性能评价。结果表明:在盐水钻井液中,w(SN-K)=3.0%(以钻井液总质量为基准,下同)时,经180℃高温老化16 h后,SN-K仍具有良好的降滤失效果,FLAPI=8.4 m L,没有添加SN-K的钻井液基浆的FLAPI=82.0 m L;泥页岩滚动回收实验表明:当w(SN-K)=1.0%时,岩屑相对岩心回收率(R*)为94.4%,远远超过KCl体系中w(KCl)=3.0%时的77.3%;利用SEM对添加SN-K的钻井液高温高压滤饼进行了微观表征,结果显示其具有致密的网架结构。
Polymerization of acrylamide (AM), 2-acrylamido-2-methylpropanesulfonic acid (AMPS), acrylic acid (AA) and diallyldimethylammonium chloride (DMDAAC) - sodium bisulfite redox initiator system, through the aqueous solution polymerization to get a new salt, high temperature, strong inhibition fluid loss control agent SN-K. The optimum monomer ratio n (AM): n (AA): n (DMDAAC) = 1: 2: 2:1 was determined by single factor experiment, the reaction temperature was 65 ℃, the reaction time was 4 h, w (monomer) = 20% (based on the total mass of the aqueous solution, the same hereinafter), w (initiator) = 0.5% (based on the total monomer mass, the same below). KOH was used to adjust the pH of the polymerization system, the strong inhibitory ion K + was introduced, and the performance of SN-K was evaluated. The results show that SN-K still has a good performance in salt water drilling at w (SN-K) = 3.0% (based on the total mass of drilling fluid) FLAPI = 8.4 m L, FLAPI = 82.0 m L for the drilling fluid base slurry without SN-K; the shale recovery experiment shows that when w (SN-K) = 1.0% The recovery rate (R *) was 94.4%, far exceeding 77.3% of the KCl system with 3.0% of w (KCl). The microstructure of the high temperature and high pressure filter cake with SN-K added by SEM was characterized by SEM. With a dense grid structure.