一种抗钙盐性能优异的吸附型酸化缓速剂  

An Excellent Calcium-and Salt-Resistant Adsorptive Retarder for Acid Job

作　　者：蒋琪 王鹏祥 全红平[3] JIANG Qi;WANG Pengxiang;QUAN Hongping(Downhole Service Company,CNPC Chuanqing Drilling Engineering Co.,LTD.,Chengdu,Sichuan 610052;Sichuan Chuanqing Downhole Technology Co.,LTD.,Guanghan,Sichuan 618300;College of Chemistry and Chemical Engineering,Southwest Petroleum University,Chengdu,Sichuan 610500)

机构地区：[1]中国石油川庆钻探工程有限公司井下作业公司,成都610052 [2]四川川庆井下科技有限公司,四川广汉618300 [3]西南石油大学化学化工学院,成都610500

出　　处：《钻井液与完井液》2024年第6期816-823,共8页Drilling Fluid & Completion Fluid

基　　金：国家自然科学基金项目“低粘吸附型酸化缓速剂分子设计及缓速机理研究”(51604229);四川省科技计划项目“聚合物型非交联自转向酸化转向剂分子设计及转向机理研究”(2019YJ0315);油气田应用化学四川省重点实验室开放基金项目“聚合物型非交联酸化自转向剂的研究”(YQKF202001)。

摘　　要：为增强储层酸化改造效果,利用磺酸盐单体(MS)、丙烯酰胺(AM)、烯丙基聚氧乙烯醚(APEG-2400)、十八烷基二甲基烯丙基氯化铵(DMAAC-18)制备一种吸附型酸化缓速剂。通过单因素实验筛选出最佳合成条件:单体配比n(AM)∶n(MS)∶n(DMAAC-18)∶n(APEG-2400)=90∶5∶1∶4,单体浓度为35%,引发剂加量为1.0%,反应温度为50℃,反应时间为5 h。使用傅里叶变换红外光谱仪(FT-IR)表征缓速剂的结构,结果表明与预期产物相符。在缓速剂加量为1.3%时,缓速率达到81.56%,并且表观黏度保持在3 mPa·s,具备优异的低黏性能。同时酸化缓速剂在110℃下的缓速率超过83%,拥有良好的抗温性能。酸化缓速剂与助排剂、铁离子稳定剂和缓蚀剂之间的配伍性好,不会出现沉淀絮凝,缓速酸体系缓速效果较好。抗氯化钙能力可达70000 mg/L,在350℃的高温下,质量损失只有17.59%,热稳定性良好。扫描电子显微镜(SEM)测试结果表明,缓速剂在岩石表面成功吸附并形成了一层致密的吸附膜。An adsorptive retarder for acid job has been developed aimed at enhancing the stimulation effect of acid job.The retarder is synthesized using monomers such as monomeric sulfonate(MS),acrylamide(AM),allyl polyoxyethylene glycol(APEG-2400)and octadecyl dimethyl allyl ammonium chloride(DMAAC-18)in a concentration ratio of n(AM)∶n(MS)∶n(DMAAC-18)∶n(APEG-2400)=90∶5∶1∶4.The concentration of the monomers is 35%,the concentration of the initiator is 1.0%,the reaction temperature is 50℃and the reaction time is 5 h.These reaction conditions were determined through single-factor experiment.The characterization of the molecular structure of the retarder with FT-IR shows that the reaction product is what was expected.The retarding efficiency of the retarder at a concentration of 1.3%is 81.56%,and the system has its apparent viscosity stabilized at 3 mPa∙s,an excellent low viscosity property.At 110℃,the retarding efficiency of the retarder exceeds 83%,indicating that the retarder has good high temperature performance.This retarder has good compatibility with cleanup additives,iron ion stabilizers and corrosion inhibitors;no flocculation and precipitation exist when the retarder is used with other additives.This retarder is able to resist the contamination by 70,000 mg/L CaCl2.It also has good thermal stability;at 350℃,the rate of mass loss of the retarder is only 17.59%.Observation of the retarder under SEM shows that the retarder is adsorbed on the surfaces of the rocks and forms a dense layer of adsorption membrane.

关 键 词：碳酸盐岩储层 酸化 缓速剂 吸附 

分 类 号：TE357.12[石油与天然气工程—油气田开发工程]