摘要
针对钻井过程中的钻井液漏失问题,以丙烯酰胺、丙烯酸、碳酸钙为主要原料,采用水溶液聚合法,制备了成本低、强度高、吸水倍率高的高吸水性树脂。实验结果表明,该树脂的最优合成条件为:单体的质量分数为20%,交联剂加量为0.3%,引发剂Na2SO3和(NH4)2S2O8质量分数分别为0.75%和1.5%时,碳酸钙的加量为3%,反应温度为50℃,pH值为11,AM:AA的质量比为7:3。在此条件下合成的高吸水性树脂,在室温下的吸水倍率为137g/g,其吸水倍率和强度均可满足钻井堵漏的需要;加入碳酸钙可提高吸水性树脂的吸水性和强度;树脂加量为0.3%～0.5%的堵漏浆即可达到良好的堵漏效果,并且吸水树脂的堵漏承压能力可达3.0MPa。
A water absorbing resin was synthesized with acrylamide AM,acrylic acid AA and CaCO3 by aqueous solution polymerization.Laboratory experiments show the best synthesis conditions are as following:mass fraction of monomer 20%,crosslinking agent 0.3%,initiators Na2SO3 and(NH4)2S2O8 with 0.75% and 1.5%,CaCO3 3%,reaction temperature 50 ℃,pH 11,and mass ratio of AM:AA = 7:3.At ambient temperature,the water absorbing capacity of the synthesized resin is 137 g/g,and the absorbing ability and strength can be improved by mixing CaCO3.When the concentration of the resin reaches 0.3%-0.5%,it can control the loss under pressure of 3.0 MPa.
出处
《钻井液与完井液》
CAS
2010年第6期23-26,共4页
Drilling Fluid & Completion Fluid
