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
蒋琪 1王鹏祥 1全红平2
作者信息
- 1. 中国石油川庆钻探工程有限公司井下作业公司,成都 610052;四川川庆井下科技有限公司,四川广汉 618300
- 2. 西南石油大学化学化工学院,成都 610500
- 折叠
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 5h.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.
Abstract
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Key words
Carbonate reservoir/Acidize/Retarder/Adsorb引用本文复制引用
出版年
2024
国家科技期刊平台
NSTL
万方数据