在石油与天然气钻探过程中,如何保证破碎性地层的稳定一直是困扰钻井领域的一大技术难点。由于破碎性地层的特殊性,钻井过程中30%左右的井壁失稳问题发生在破碎性地层。室内选择N-乙烯基吡咯烷酮、2-丙烯酰胺基2-甲基丙磺酸(AMPS)、二甲基二烯丙基氯化铵、r-丙烯酸脂丙基三甲氧基硅烷等单体,优化合成条件,单体质量比4:2:1:1,单体浓度为30%,反应时间为4 h,反应温度为60℃,引发剂(过硫酸钾/亚硫酸氢钠)加量为0.5%,反应pH为8~9,合成了一种适合于破碎性地层的井壁稳定剂。对其分子结构进行了表征,分析了作用机理。性能评价结果表明,井壁稳定剂SACA-1抗温达到220℃,现场岩屑在3% SACA-1溶液中的热滚回收率为80.03%;在空气与水中联接后抗剪切强度分别为0.301 MPa和0.206 MPa,单轴抗压强度为8.47 MPa,3% SACA-1加入至聚磺钻井液和KCl-聚合物钻井液后,性能稳定,热滚回收率分别为85.8%和88.7%,对于破碎性地层有较好的稳定效果。In the process of oil and gas drilling, how to ensure the stability of fractured formations has always been a major technical difficulty in the drilling field. Due to the particularity of fractured formations, about 30% of the borehole instability problems occur in fractured formations during the drilling process. N-vinylpyrrolidone, 2-acrylamide 2-methylpropanesulfonic acid (AMPS), dimethyldiallylammonium chloride, r-acrylate propyltrimethoxysilane and other monomers were selected indoors, and the synthesis conditions were optimized, the monomer mass ratio was 4:2:1:1, the monomer concentration was 30%, the reaction time was 4 h, the reaction temperature was 60˚C, the initiator (potassium persulfate/sodium bisulfite) was 0.5%, and the reaction pH was 8~9, and a borehole stabilizer suitable for fractured formations was synthesized. Its molecular structure was characterized and the mechanism of action was analyzed. The performance evaluation results show that the t
