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nano-Si O_2在γ-氨丙基三乙氧基硅烷(KH-550)偶联剂作用下得到改性nano-Si O_2,再与丙烯酰胺(AM)、2-丙烯酰胺基-2-甲基丙磺酸(AMPS)、衣康酸(IA)、二烯丙基二甲基氯化铵(DMDAAC),采用自由基聚合法,合成得到一种有机/无机复合降滤失剂LJ-1。通过正交实验法得到最佳反应条件为:m(AM)∶m(AMPS)∶m(IA)∶m(DMDAAC)∶m(改性Si O_2)=8∶5∶2∶1∶0.96,反应温度65℃,反应时间4 h,引发剂过硫酸铵(APS)加量为单体总质量的1.0%。采用FTIR、~1HNMR对LJ-1降滤失剂结构进行表征,并对其降滤失性进行评价。结果表明,淡水基浆中LJ-1降滤失剂添加量为1.5%(质量分数)时,FLAPI=5.8 mL,具有良好的降滤失性能;盐水基浆中LJ-1降滤失剂添加量为3.0%,FLHTHP=18.4 mL,具有良好的抗盐性;利用扫描电镜(SEM)对钻井液滤饼微观形貌进行观察,发现添加LJ-1钻井液的滤饼坚韧致密并具有致密的网架结构。
nano-Si O 2 was modified by γ-aminopropyltriethoxysilane (KH-550) coupling agent nano-Si O 2, and then with acrylamide (AM), 2-acrylamido-2- (AMPS), itaconic acid (IA) and diallyldimethylammonium chloride (DMDAAC) were synthesized by free radical polymerization to obtain an organic / inorganic composite fluid loss additive LJ-1 . The optimal reaction conditions were as follows: m (AM): m (AMPS): m (IA): m (DMDAAC): m (modified Si O 2) = 8: 5: 2:1:0.96, The reaction temperature was 65 ℃, the reaction time was 4 h and the initiator APS was 1.0% of the total mass of monomer. The structure of LJ-1 filtrate reducer was characterized by FTIR and ~ 1HNMR, and its filtration loss was evaluated. The results showed that FLAPI = 5.8 mL when LJ-1 filtrate was added in fresh water-based pulp at a concentration of 1.5% (mass fraction), and had good performance of filtrate loss. LJ-1 filtrate reducer FLHTHP = 18.4 mL, with good salt tolerance. The morphology of drilling fluid filter cake was observed by scanning electron microscopy (SEM), and the filter cake with LJ-1 drilling fluid was found to be tough and dense with a dense Grid structure.