一种环保型酸化液的研制及性能研究

Development and performance study of an environmentally friendly acidizing solution

针对常规土酸解堵过程中存在酸岩反应过快和残酸容易产生二次沉淀的问题,开展了一种环保型酸化液的研制及性能评价研究。酸化液主要成分包括有机磷酸聚合物、氟盐、盐酸等,通过将异丙烯膦酸单体与丙烯酸单体共聚得到异丙烯膦酸—丙烯酸聚合物,即有机磷酸聚合物,并对其进行红外表征分析和性能评价实验。结果表明:所合成的聚合物中含有磷酸基和羧酸基,氢离子为多级电离缓慢释放状态,对岩屑用环保型酸液1h溶蚀率仅为3. 5%, 16h后溶蚀率逐渐趋于稳定,缓速溶蚀效果显著,对模拟水的阻垢率高达91. 5%,且无二次沉淀产生。该环保型酸化液的研制,为油田增产提供了技术支撑。

In the process of removing plug by conventional mud acid,there are two problems existed,i.e.the reaction time of acid and rock is too fast,and the residual acid is easy to produce secondary precipitation,therefore,the development and performance study of an environmentally friendly acidizing solution have been carried out.The main components of acidizing solution include organic phosphoric acid polymer,villiaumite,hydrochloric acid,etc.Through the copolymerization of isopropene phosphate monomer and acrylic monomer,it can be formed into the copolymer of isopropylphosphonic acid and acrylic acid,namely organo-phosphoric acid polymer.The experimental results of infrared characterization anaylsis and performance evaluation for the environmentally friendly acid solution showed that synthesized polymers contained phosphate and carboxylic groups,and the hydrogen ion released slowly by multi-stage ionization,possessing the dissolution rate of only 3.5%to the cuttings in one hour.After 16 hours,the dissolution rate tends to be stable,with remarkable effect for slowing dissolution.Its scale inhibition rate for simulated water is up to 91.5%,and there is no secondary precipitation.The development of the environmentally friendly acidizing fluid provides technical support for oil field production increase.